text: (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
  module.exports = require('./lib/axios');
  },{"./lib/axios":3}],2:[function(require,module,exports){
  (function (process){
  'use strict';
  
  var utils = require('./../utils');
  var settle = require('./../core/settle');
  var buildURL = require('./../helpers/buildURL');
  var parseHeaders = require('./../helpers/parseHeaders');
  var isURLSameOrigin = require('./../helpers/isURLSameOrigin');
  var createError = require('../core/createError');
  var btoa = (typeof window !== 'undefined' && window.btoa && window.btoa.bind(window)) || require('./../helpers/btoa');
  
  module.exports = function xhrAdapter(config) {
    return new Promise(function dispatchXhrRequest(resolve, reject) {
      var requestData = config.data;
      var requestHeaders = config.headers;
  
      if (utils.isFormData(requestData)) {
        delete requestHeaders['Content-Type']; // Let the browser set it
      }
  
      var request = new XMLHttpRequest();
      var loadEvent = 'onreadystatechange';
      var xDomain = false;
  
      // For IE 8/9 CORS support
      // Only supports POST and GET calls and doesn't returns the response headers.
      // DON'T do this for testing b/c XMLHttpRequest is mocked, not XDomainRequest.
      if (process.env.NODE_ENV !== 'test' &&
          typeof window !== 'undefined' &&
          window.XDomainRequest && !('withCredentials' in request) &&
          !isURLSameOrigin(config.url)) {
        request = new window.XDomainRequest();
        loadEvent = 'onload';
        xDomain = true;
        request.onprogress = function handleProgress() {};
        request.ontimeout = function handleTimeout() {};
      }
  
      // HTTP basic authentication
      if (config.auth) {
        var username = config.auth.username || '';
        var password = config.auth.password || '';
        requestHeaders.Authorization = 'Basic ' + btoa(username + ':' + password);
      }
  
      request.open(config.method.toUpperCase(), buildURL(config.url, config.params, config.paramsSerializer), true);
  
      // Set the request timeout in MS
      request.timeout = config.timeout;
  
      // Listen for ready state
      request[loadEvent] = function handleLoad() {
        if (!request || (request.readyState !== 4 && !xDomain)) {
          return;
        }
  
        // The request errored out and we didn't get a response, this will be
        // handled by onerror instead
        // With one exception: request that using file: protocol, most browsers
        // will return status as 0 even though it's a successful request
        if (request.status === 0 && !(request.responseURL && request.responseURL.indexOf('file:') === 0)) {
          return;
        }
  
        // Prepare the response
        var responseHeaders = 'getAllResponseHeaders' in request ? parseHeaders(request.getAllResponseHeaders()) : null;
        var responseData = !config.responseType || config.responseType === 'text' ? request.responseText : request.response;
        var response = {
          data: responseData,
          // IE sends 1223 instead of 204 (https://github.com/axios/axios/issues/201)
          status: request.status === 1223 ? 204 : request.status,
          statusText: request.status === 1223 ? 'No Content' : request.statusText,
          headers: responseHeaders,
          config: config,
          request: request
        };
  
        settle(resolve, reject, response);
  
        // Clean up request
        request = null;
      };
  
      // Handle low level network errors
      request.onerror = function handleError() {
        // Real errors are hidden from us by the browser
        // onerror should only fire if it's a network error
        reject(createError('Network Error', config, null, request));
  
        // Clean up request
        request = null;
      };
  
      // Handle timeout
      request.ontimeout = function handleTimeout() {
        reject(createError('timeout of ' + config.timeout + 'ms exceeded', config, 'ECONNABORTED',
          request));
  
        // Clean up request
        request = null;
      };
  
      // Add xsrf header
      // This is only done if running in a standard browser environment.
      // Specifically not if we're in a web worker, or react-native.
      if (utils.isStandardBrowserEnv()) {
        var cookies = require('./../helpers/cookies');
  
        // Add xsrf header
        var xsrfValue = (config.withCredentials || isURLSameOrigin(config.url)) && config.xsrfCookieName ?
            cookies.read(config.xsrfCookieName) :
            undefined;
  
        if (xsrfValue) {
          requestHeaders[config.xsrfHeaderName] = xsrfValue;
        }
      }
  
      // Add headers to the request
      if ('setRequestHeader' in request) {
        utils.forEach(requestHeaders, function setRequestHeader(val, key) {
          if (typeof requestData === 'undefined' && key.toLowerCase() === 'content-type') {
            // Remove Content-Type if data is undefined
            delete requestHeaders[key];
          } else {
            // Otherwise add header to the request
            request.setRequestHeader(key, val);
          }
        });
      }
  
      // Add withCredentials to request if needed
      if (config.withCredentials) {
        request.withCredentials = true;
      }
  
      // Add responseType to request if needed
      if (config.responseType) {
        try {
          request.responseType = config.responseType;
        } catch (e) {
          // Expected DOMException thrown by browsers not compatible XMLHttpRequest Level 2.
          // But, this can be suppressed for 'json' type as it can be parsed by default 'transformResponse' function.
          if (config.responseType !== 'json') {
            throw e;
          }
        }
      }
  
      // Handle progress if needed
      if (typeof config.onDownloadProgress === 'function') {
        request.addEventListener('progress', config.onDownloadProgress);
      }
  
      // Not all browsers support upload events
      if (typeof config.onUploadProgress === 'function' && request.upload) {
        request.upload.addEventListener('progress', config.onUploadProgress);
      }
  
      if (config.cancelToken) {
        // Handle cancellation
        config.cancelToken.promise.then(function onCanceled(cancel) {
          if (!request) {
            return;
          }
  
          request.abort();
          reject(cancel);
          // Clean up request
          request = null;
        });
      }
  
      if (requestData === undefined) {
        requestData = null;
      }
  
      // Send the request
      request.send(requestData);
    });
  };
  
  }).call(this,require('_process'))
  },{"../core/createError":9,"./../core/settle":12,"./../helpers/btoa":16,"./../helpers/buildURL":17,"./../helpers/cookies":19,"./../helpers/isURLSameOrigin":21,"./../helpers/parseHeaders":23,"./../utils":25,"_process":30}],3:[function(require,module,exports){
  'use strict';
  
  var utils = require('./utils');
  var bind = require('./helpers/bind');
  var Axios = require('./core/Axios');
  var defaults = require('./defaults');
  
  /**
   * Create an instance of Axios
   *
   * @param {Object} defaultConfig The default config for the instance
   * @return {Axios} A new instance of Axios
   */
  function createInstance(defaultConfig) {
    var context = new Axios(defaultConfig);
    var instance = bind(Axios.prototype.request, context);
  
    // Copy axios.prototype to instance
    utils.extend(instance, Axios.prototype, context);
  
    // Copy context to instance
    utils.extend(instance, context);
  
    return instance;
  }
  
  // Create the default instance to be exported
  var axios = createInstance(defaults);
  
  // Expose Axios class to allow class inheritance
  axios.Axios = Axios;
  
  // Factory for creating new instances
  axios.create = function create(instanceConfig) {
    return createInstance(utils.merge(defaults, instanceConfig));
  };
  
  // Expose Cancel & CancelToken
  axios.Cancel = require('./cancel/Cancel');
  axios.CancelToken = require('./cancel/CancelToken');
  axios.isCancel = require('./cancel/isCancel');
  
  // Expose all/spread
  axios.all = function all(promises) {
    return Promise.all(promises);
  };
  axios.spread = require('./helpers/spread');
  
  module.exports = axios;
  
  // Allow use of default import syntax in TypeScript
  module.exports.default = axios;
  
  },{"./cancel/Cancel":4,"./cancel/CancelToken":5,"./cancel/isCancel":6,"./core/Axios":7,"./defaults":14,"./helpers/bind":15,"./helpers/spread":24,"./utils":25}],4:[function(require,module,exports){
  'use strict';
  
  /**
   * A `Cancel` is an object that is thrown when an operation is canceled.
   *
   * @class
   * @param {string=} message The message.
   */
  function Cancel(message) {
    this.message = message;
  }
  
  Cancel.prototype.toString = function toString() {
    return 'Cancel' + (this.message ? ': ' + this.message : '');
  };
  
  Cancel.prototype.__CANCEL__ = true;
  
  module.exports = Cancel;
  
  },{}],5:[function(require,module,exports){
  'use strict';
  
  var Cancel = require('./Cancel');
  
  /**
   * A `CancelToken` is an object that can be used to request cancellation of an operation.
   *
   * @class
   * @param {Function} executor The executor function.
   */
  function CancelToken(executor) {
    if (typeof executor !== 'function') {
      throw new TypeError('executor must be a function.');
    }
  
    var resolvePromise;
    this.promise = new Promise(function promiseExecutor(resolve) {
      resolvePromise = resolve;
    });
  
    var token = this;
    executor(function cancel(message) {
      if (token.reason) {
        // Cancellation has already been requested
        return;
      }
  
      token.reason = new Cancel(message);
      resolvePromise(token.reason);
    });
  }
  
  /**
   * Throws a `Cancel` if cancellation has been requested.
   */
  CancelToken.prototype.throwIfRequested = function throwIfRequested() {
    if (this.reason) {
      throw this.reason;
    }
  };
  
  /**
   * Returns an object that contains a new `CancelToken` and a function that, when called,
   * cancels the `CancelToken`.
   */
  CancelToken.source = function source() {
    var cancel;
    var token = new CancelToken(function executor(c) {
      cancel = c;
    });
    return {
      token: token,
      cancel: cancel
    };
  };
  
  module.exports = CancelToken;
  
  },{"./Cancel":4}],6:[function(require,module,exports){
  'use strict';
  
  module.exports = function isCancel(value) {
    return !!(value && value.__CANCEL__);
  };
  
  },{}],7:[function(require,module,exports){
  'use strict';
  
  var defaults = require('./../defaults');
  var utils = require('./../utils');
  var InterceptorManager = require('./InterceptorManager');
  var dispatchRequest = require('./dispatchRequest');
  
  /**
   * Create a new instance of Axios
   *
   * @param {Object} instanceConfig The default config for the instance
   */
  function Axios(instanceConfig) {
    this.defaults = instanceConfig;
    this.interceptors = {
      request: new InterceptorManager(),
      response: new InterceptorManager()
    };
  }
  
  /**
   * Dispatch a request
   *
   * @param {Object} config The config specific for this request (merged with this.defaults)
   */
  Axios.prototype.request = function request(config) {
    /*eslint no-param-reassign:0*/
    // Allow for axios('example/url'[, config]) a la fetch API
    if (typeof config === 'string') {
      config = utils.merge({
        url: arguments[0]
      }, arguments[1]);
    }
  
    config = utils.merge(defaults, this.defaults, { method: 'get' }, config);
    config.method = config.method.toLowerCase();
  
    // Hook up interceptors middleware
    var chain = [dispatchRequest, undefined];
    var promise = Promise.resolve(config);
  
    this.interceptors.request.forEach(function unshiftRequestInterceptors(interceptor) {
      chain.unshift(interceptor.fulfilled, interceptor.rejected);
    });
  
    this.interceptors.response.forEach(function pushResponseInterceptors(interceptor) {
      chain.push(interceptor.fulfilled, interceptor.rejected);
    });
  
    while (chain.length) {
      promise = promise.then(chain.shift(), chain.shift());
    }
  
    return promise;
  };
  
  // Provide aliases for supported request methods
  utils.forEach(['delete', 'get', 'head', 'options'], function forEachMethodNoData(method) {
    /*eslint func-names:0*/
    Axios.prototype[method] = function(url, config) {
      return this.request(utils.merge(config || {}, {
        method: method,
        url: url
      }));
    };
  });
  
  utils.forEach(['post', 'put', 'patch'], function forEachMethodWithData(method) {
    /*eslint func-names:0*/
    Axios.prototype[method] = function(url, data, config) {
      return this.request(utils.merge(config || {}, {
        method: method,
        url: url,
        data: data
      }));
    };
  });
  
  module.exports = Axios;
  
  },{"./../defaults":14,"./../utils":25,"./InterceptorManager":8,"./dispatchRequest":10}],8:[function(require,module,exports){
  'use strict';
  
  var utils = require('./../utils');
  
  function InterceptorManager() {
    this.handlers = [];
  }
  
  /**
   * Add a new interceptor to the stack
   *
   * @param {Function} fulfilled The function to handle `then` for a `Promise`
   * @param {Function} rejected The function to handle `reject` for a `Promise`
   *
   * @return {Number} An ID used to remove interceptor later
   */
  InterceptorManager.prototype.use = function use(fulfilled, rejected) {
    this.handlers.push({
      fulfilled: fulfilled,
      rejected: rejected
    });
    return this.handlers.length - 1;
  };
  
  /**
   * Remove an interceptor from the stack
   *
   * @param {Number} id The ID that was returned by `use`
   */
  InterceptorManager.prototype.eject = function eject(id) {
    if (this.handlers[id]) {
      this.handlers[id] = null;
    }
  };
  
  /**
   * Iterate over all the registered interceptors
   *
   * This method is particularly useful for skipping over any
   * interceptors that may have become `null` calling `eject`.
   *
   * @param {Function} fn The function to call for each interceptor
   */
  InterceptorManager.prototype.forEach = function forEach(fn) {
    utils.forEach(this.handlers, function forEachHandler(h) {
      if (h !== null) {
        fn(h);
      }
    });
  };
  
  module.exports = InterceptorManager;
  
  },{"./../utils":25}],9:[function(require,module,exports){
  'use strict';
  
  var enhanceError = require('./enhanceError');
  
  /**
   * Create an Error with the specified message, config, error code, request and response.
   *
   * @param {string} message The error message.
   * @param {Object} config The config.
   * @param {string} [code] The error code (for example, 'ECONNABORTED').
   * @param {Object} [request] The request.
   * @param {Object} [response] The response.
   * @returns {Error} The created error.
   */
  module.exports = function createError(message, config, code, request, response) {
    var error = new Error(message);
    return enhanceError(error, config, code, request, response);
  };
  
  },{"./enhanceError":11}],10:[function(require,module,exports){
  'use strict';
  
  var utils = require('./../utils');
  var transformData = require('./transformData');
  var isCancel = require('../cancel/isCancel');
  var defaults = require('../defaults');
  var isAbsoluteURL = require('./../helpers/isAbsoluteURL');
  var combineURLs = require('./../helpers/combineURLs');
  
  /**
   * Throws a `Cancel` if cancellation has been requested.
   */
  function throwIfCancellationRequested(config) {
    if (config.cancelToken) {
      config.cancelToken.throwIfRequested();
    }
  }
  
  /**
   * Dispatch a request to the server using the configured adapter.
   *
   * @param {object} config The config that is to be used for the request
   * @returns {Promise} The Promise to be fulfilled
   */
  module.exports = function dispatchRequest(config) {
    throwIfCancellationRequested(config);
  
    // Support baseURL config
    if (config.baseURL && !isAbsoluteURL(config.url)) {
      config.url = combineURLs(config.baseURL, config.url);
    }
  
    // Ensure headers exist
    config.headers = config.headers || {};
  
    // Transform request data
    config.data = transformData(
      config.data,
      config.headers,
      config.transformRequest
    );
  
    // Flatten headers
    config.headers = utils.merge(
      config.headers.common || {},
      config.headers[config.method] || {},
      config.headers || {}
    );
  
    utils.forEach(
      ['delete', 'get', 'head', 'post', 'put', 'patch', 'common'],
      function cleanHeaderConfig(method) {
        delete config.headers[method];
      }
    );
  
    var adapter = config.adapter || defaults.adapter;
  
    return adapter(config).then(function onAdapterResolution(response) {
      throwIfCancellationRequested(config);
  
      // Transform response data
      response.data = transformData(
        response.data,
        response.headers,
        config.transformResponse
      );
  
      return response;
    }, function onAdapterRejection(reason) {
      if (!isCancel(reason)) {
        throwIfCancellationRequested(config);
  
        // Transform response data
        if (reason && reason.response) {
          reason.response.data = transformData(
            reason.response.data,
            reason.response.headers,
            config.transformResponse
          );
        }
      }
  
      return Promise.reject(reason);
    });
  };
  
  },{"../cancel/isCancel":6,"../defaults":14,"./../helpers/combineURLs":18,"./../helpers/isAbsoluteURL":20,"./../utils":25,"./transformData":13}],11:[function(require,module,exports){
  'use strict';
  
  /**
   * Update an Error with the specified config, error code, and response.
   *
   * @param {Error} error The error to update.
   * @param {Object} config The config.
   * @param {string} [code] The error code (for example, 'ECONNABORTED').
   * @param {Object} [request] The request.
   * @param {Object} [response] The response.
   * @returns {Error} The error.
   */
  module.exports = function enhanceError(error, config, code, request, response) {
    error.config = config;
    if (code) {
      error.code = code;
    }
    error.request = request;
    error.response = response;
    return error;
  };
  
  },{}],12:[function(require,module,exports){
  'use strict';
  
  var createError = require('./createError');
  
  /**
   * Resolve or reject a Promise based on response status.
   *
   * @param {Function} resolve A function that resolves the promise.
   * @param {Function} reject A function that rejects the promise.
   * @param {object} response The response.
   */
  module.exports = function settle(resolve, reject, response) {
    var validateStatus = response.config.validateStatus;
    // Note: status is not exposed by XDomainRequest
    if (!response.status || !validateStatus || validateStatus(response.status)) {
      resolve(response);
    } else {
      reject(createError(
        'Request failed with status code ' + response.status,
        response.config,
        null,
        response.request,
        response
      ));
    }
  };
  
  },{"./createError":9}],13:[function(require,module,exports){
  'use strict';
  
  var utils = require('./../utils');
  
  /**
   * Transform the data for a request or a response
   *
   * @param {Object|String} data The data to be transformed
   * @param {Array} headers The headers for the request or response
   * @param {Array|Function} fns A single function or Array of functions
   * @returns {*} The resulting transformed data
   */
  module.exports = function transformData(data, headers, fns) {
    /*eslint no-param-reassign:0*/
    utils.forEach(fns, function transform(fn) {
      data = fn(data, headers);
    });
  
    return data;
  };
  
  },{"./../utils":25}],14:[function(require,module,exports){
  (function (process){
  'use strict';
  
  var utils = require('./utils');
  var normalizeHeaderName = require('./helpers/normalizeHeaderName');
  
  var DEFAULT_CONTENT_TYPE = {
    'Content-Type': 'application/x-www-form-urlencoded'
  };
  
  function setContentTypeIfUnset(headers, value) {
    if (!utils.isUndefined(headers) && utils.isUndefined(headers['Content-Type'])) {
      headers['Content-Type'] = value;
    }
  }
  
  function getDefaultAdapter() {
    var adapter;
    if (typeof XMLHttpRequest !== 'undefined') {
      // For browsers use XHR adapter
      adapter = require('./adapters/xhr');
    } else if (typeof process !== 'undefined') {
      // For node use HTTP adapter
      adapter = require('./adapters/http');
    }
    return adapter;
  }
  
  var defaults = {
    adapter: getDefaultAdapter(),
  
    transformRequest: [function transformRequest(data, headers) {
      normalizeHeaderName(headers, 'Content-Type');
      if (utils.isFormData(data) ||
        utils.isArrayBuffer(data) ||
        utils.isBuffer(data) ||
        utils.isStream(data) ||
        utils.isFile(data) ||
        utils.isBlob(data)
      ) {
        return data;
      }
      if (utils.isArrayBufferView(data)) {
        return data.buffer;
      }
      if (utils.isURLSearchParams(data)) {
        setContentTypeIfUnset(headers, 'application/x-www-form-urlencoded;charset=utf-8');
        return data.toString();
      }
      if (utils.isObject(data)) {
        setContentTypeIfUnset(headers, 'application/json;charset=utf-8');
        return JSON.stringify(data);
      }
      return data;
    }],
  
    transformResponse: [function transformResponse(data) {
      /*eslint no-param-reassign:0*/
      if (typeof data === 'string') {
        try {
          data = JSON.parse(data);
        } catch (e) { /* Ignore */ }
      }
      return data;
    }],
  
    timeout: 0,
  
    xsrfCookieName: 'XSRF-TOKEN',
    xsrfHeaderName: 'X-XSRF-TOKEN',
  
    maxContentLength: -1,
  
    validateStatus: function validateStatus(status) {
      return status >= 200 && status < 300;
    }
  };
  
  defaults.headers = {
    common: {
      'Accept': 'application/json, text/plain, */*'
    }
  };
  
  utils.forEach(['delete', 'get', 'head'], function forEachMethodNoData(method) {
    defaults.headers[method] = {};
  });
  
  utils.forEach(['post', 'put', 'patch'], function forEachMethodWithData(method) {
    defaults.headers[method] = utils.merge(DEFAULT_CONTENT_TYPE);
  });
  
  module.exports = defaults;
  
  }).call(this,require('_process'))
  },{"./adapters/http":2,"./adapters/xhr":2,"./helpers/normalizeHeaderName":22,"./utils":25,"_process":30}],15:[function(require,module,exports){
  'use strict';
  
  module.exports = function bind(fn, thisArg) {
    return function wrap() {
      var args = new Array(arguments.length);
      for (var i = 0; i < args.length; i++) {
        args[i] = arguments[i];
      }
      return fn.apply(thisArg, args);
    };
  };
  
  },{}],16:[function(require,module,exports){
  'use strict';
  
  // btoa polyfill for IE<10 courtesy https://github.com/davidchambers/Base64.js
  
  var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
  
  function E() {
    this.message = 'String contains an invalid character';
  }
  E.prototype = new Error;
  E.prototype.code = 5;
  E.prototype.name = 'InvalidCharacterError';
  
  function btoa(input) {
    var str = String(input);
    var output = '';
    for (
      // initialize result and counter
      var block, charCode, idx = 0, map = chars;
      // if the next str index does not exist:
      //   change the mapping table to "="
      //   check if d has no fractional digits
      str.charAt(idx | 0) || (map = '=', idx % 1);
      // "8 - idx % 1 * 8" generates the sequence 2, 4, 6, 8
      output += map.charAt(63 & block >> 8 - idx % 1 * 8)
    ) {
      charCode = str.charCodeAt(idx += 3 / 4);
      if (charCode > 0xFF) {
        throw new E();
      }
      block = block << 8 | charCode;
    }
    return output;
  }
  
  module.exports = btoa;
  
  },{}],17:[function(require,module,exports){
  'use strict';
  
  var utils = require('./../utils');
  
  function encode(val) {
    return encodeURIComponent(val).
      replace(/%40/gi, '@').
      replace(/%3A/gi, ':').
      replace(/%24/g, '$').
      replace(/%2C/gi, ',').
      replace(/%20/g, '+').
      replace(/%5B/gi, '[').
      replace(/%5D/gi, ']');
  }
  
  /**
   * Build a URL by appending params to the end
   *
   * @param {string} url The base of the url (e.g., http://www.google.com)
   * @param {object} [params] The params to be appended
   * @returns {string} The formatted url
   */
  module.exports = function buildURL(url, params, paramsSerializer) {
    /*eslint no-param-reassign:0*/
    if (!params) {
      return url;
    }
  
    var serializedParams;
    if (paramsSerializer) {
      serializedParams = paramsSerializer(params);
    } else if (utils.isURLSearchParams(params)) {
      serializedParams = params.toString();
    } else {
      var parts = [];
  
      utils.forEach(params, function serialize(val, key) {
        if (val === null || typeof val === 'undefined') {
          return;
        }
  
        if (utils.isArray(val)) {
          key = key + '[]';
        }
  
        if (!utils.isArray(val)) {
          val = [val];
        }
  
        utils.forEach(val, function parseValue(v) {
          if (utils.isDate(v)) {
            v = v.toISOString();
          } else if (utils.isObject(v)) {
            v = JSON.stringify(v);
          }
          parts.push(encode(key) + '=' + encode(v));
        });
      });
  
      serializedParams = parts.join('&');
    }
  
    if (serializedParams) {
      url += (url.indexOf('?') === -1 ? '?' : '&') + serializedParams;
    }
  
    return url;
  };
  
  },{"./../utils":25}],18:[function(require,module,exports){
  'use strict';
  
  /**
   * Creates a new URL by combining the specified URLs
   *
   * @param {string} baseURL The base URL
   * @param {string} relativeURL The relative URL
   * @returns {string} The combined URL
   */
  module.exports = function combineURLs(baseURL, relativeURL) {
    return relativeURL
      ? baseURL.replace(/\/+$/, '') + '/' + relativeURL.replace(/^\/+/, '')
      : baseURL;
  };
  
  },{}],19:[function(require,module,exports){
  'use strict';
  
  var utils = require('./../utils');
  
  module.exports = (
    utils.isStandardBrowserEnv() ?
  
    // Standard browser envs support document.cookie
    (function standardBrowserEnv() {
      return {
        write: function write(name, value, expires, path, domain, secure) {
          var cookie = [];
          cookie.push(name + '=' + encodeURIComponent(value));
  
          if (utils.isNumber(expires)) {
            cookie.push('expires=' + new Date(expires).toGMTString());
          }
  
          if (utils.isString(path)) {
            cookie.push('path=' + path);
          }
  
          if (utils.isString(domain)) {
            cookie.push('domain=' + domain);
          }
  
          if (secure === true) {
            cookie.push('secure');
          }
  
          document.cookie = cookie.join('; ');
        },
  
        read: function read(name) {
          var match = document.cookie.match(new RegExp('(^|;\\s*)(' + name + ')=([^;]*)'));
          return (match ? decodeURIComponent(match[3]) : null);
        },
  
        remove: function remove(name) {
          this.write(name, '', Date.now() - 86400000);
        }
      };
    })() :
  
    // Non standard browser env (web workers, react-native) lack needed support.
    (function nonStandardBrowserEnv() {
      return {
        write: function write() {},
        read: function read() { return null; },
        remove: function remove() {}
      };
    })()
  );
  
  },{"./../utils":25}],20:[function(require,module,exports){
  'use strict';
  
  /**
   * Determines whether the specified URL is absolute
   *
   * @param {string} url The URL to test
   * @returns {boolean} True if the specified URL is absolute, otherwise false
   */
  module.exports = function isAbsoluteURL(url) {
    // A URL is considered absolute if it begins with "<scheme>://" or "//" (protocol-relative URL).
    // RFC 3986 defines scheme name as a sequence of characters beginning with a letter and followed
    // by any combination of letters, digits, plus, period, or hyphen.
    return /^([a-z][a-z\d\+\-\.]*:)?\/\//i.test(url);
  };
  
  },{}],21:[function(require,module,exports){
  'use strict';
  
  var utils = require('./../utils');
  
  module.exports = (
    utils.isStandardBrowserEnv() ?
  
    // Standard browser envs have full support of the APIs needed to test
    // whether the request URL is of the same origin as current location.
    (function standardBrowserEnv() {
      var msie = /(msie|trident)/i.test(navigator.userAgent);
      var urlParsingNode = document.createElement('a');
      var originURL;
  
      /**
      * Parse a URL to discover it's components
      *
      * @param {String} url The URL to be parsed
      * @returns {Object}
      */
      function resolveURL(url) {
        var href = url;
  
        if (msie) {
          // IE needs attribute set twice to normalize properties
          urlParsingNode.setAttribute('href', href);
          href = urlParsingNode.href;
        }
  
        urlParsingNode.setAttribute('href', href);
  
        // urlParsingNode provides the UrlUtils interface - http://url.spec.whatwg.org/#urlutils
        return {
          href: urlParsingNode.href,
          protocol: urlParsingNode.protocol ? urlParsingNode.protocol.replace(/:$/, '') : '',
          host: urlParsingNode.host,
          search: urlParsingNode.search ? urlParsingNode.search.replace(/^\?/, '') : '',
          hash: urlParsingNode.hash ? urlParsingNode.hash.replace(/^#/, '') : '',
          hostname: urlParsingNode.hostname,
          port: urlParsingNode.port,
          pathname: (urlParsingNode.pathname.charAt(0) === '/') ?
                    urlParsingNode.pathname :
                    '/' + urlParsingNode.pathname
        };
      }
  
      originURL = resolveURL(window.location.href);
  
      /**
      * Determine if a URL shares the same origin as the current location
      *
      * @param {String} requestURL The URL to test
      * @returns {boolean} True if URL shares the same origin, otherwise false
      */
      return function isURLSameOrigin(requestURL) {
        var parsed = (utils.isString(requestURL)) ? resolveURL(requestURL) : requestURL;
        return (parsed.protocol === originURL.protocol &&
              parsed.host === originURL.host);
      };
    })() :
  
    // Non standard browser envs (web workers, react-native) lack needed support.
    (function nonStandardBrowserEnv() {
      return function isURLSameOrigin() {
        return true;
      };
    })()
  );
  
  },{"./../utils":25}],22:[function(require,module,exports){
  'use strict';
  
  var utils = require('../utils');
  
  module.exports = function normalizeHeaderName(headers, normalizedName) {
    utils.forEach(headers, function processHeader(value, name) {
      if (name !== normalizedName && name.toUpperCase() === normalizedName.toUpperCase()) {
        headers[normalizedName] = value;
        delete headers[name];
      }
    });
  };
  
  },{"../utils":25}],23:[function(require,module,exports){
  'use strict';
  
  var utils = require('./../utils');
  
  // Headers whose duplicates are ignored by node
  // c.f. https://nodejs.org/api/http.html#http_message_headers
  var ignoreDuplicateOf = [
    'age', 'authorization', 'content-length', 'content-type', 'etag',
    'expires', 'from', 'host', 'if-modified-since', 'if-unmodified-since',
    'last-modified', 'location', 'max-forwards', 'proxy-authorization',
    'referer', 'retry-after', 'user-agent'
  ];
  
  /**
   * Parse headers into an object
   *
   * ```
   * Date: Wed, 27 Aug 2014 08:58:49 GMT
   * Content-Type: application/json
   * Connection: keep-alive
   * Transfer-Encoding: chunked
   * ```
   *
   * @param {String} headers Headers needing to be parsed
   * @returns {Object} Headers parsed into an object
   */
  module.exports = function parseHeaders(headers) {
    var parsed = {};
    var key;
    var val;
    var i;
  
    if (!headers) { return parsed; }
  
    utils.forEach(headers.split('\n'), function parser(line) {
      i = line.indexOf(':');
      key = utils.trim(line.substr(0, i)).toLowerCase();
      val = utils.trim(line.substr(i + 1));
  
      if (key) {
        if (parsed[key] && ignoreDuplicateOf.indexOf(key) >= 0) {
          return;
        }
        if (key === 'set-cookie') {
          parsed[key] = (parsed[key] ? parsed[key] : []).concat([val]);
        } else {
          parsed[key] = parsed[key] ? parsed[key] + ', ' + val : val;
        }
      }
    });
  
    return parsed;
  };
  
  },{"./../utils":25}],24:[function(require,module,exports){
  'use strict';
  
  /**
   * Syntactic sugar for invoking a function and expanding an array for arguments.
   *
   * Common use case would be to use `Function.prototype.apply`.
   *
   *  ```js
   *  function f(x, y, z) {}
   *  var args = [1, 2, 3];
   *  f.apply(null, args);
   *  ```
   *
   * With `spread` this example can be re-written.
   *
   *  ```js
   *  spread(function(x, y, z) {})([1, 2, 3]);
   *  ```
   *
   * @param {Function} callback
   * @returns {Function}
   */
  module.exports = function spread(callback) {
    return function wrap(arr) {
      return callback.apply(null, arr);
    };
  };
  
  },{}],25:[function(require,module,exports){
  'use strict';
  
  var bind = require('./helpers/bind');
  var isBuffer = require('is-buffer');
  
  /*global toString:true*/
  
  // utils is a library of generic helper functions non-specific to axios
  
  var toString = Object.prototype.toString;
  
  /**
   * Determine if a value is an Array
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if value is an Array, otherwise false
   */
  function isArray(val) {
    return toString.call(val) === '[object Array]';
  }
  
  /**
   * Determine if a value is an ArrayBuffer
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if value is an ArrayBuffer, otherwise false
   */
  function isArrayBuffer(val) {
    return toString.call(val) === '[object ArrayBuffer]';
  }
  
  /**
   * Determine if a value is a FormData
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if value is an FormData, otherwise false
   */
  function isFormData(val) {
    return (typeof FormData !== 'undefined') && (val instanceof FormData);
  }
  
  /**
   * Determine if a value is a view on an ArrayBuffer
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if value is a view on an ArrayBuffer, otherwise false
   */
  function isArrayBufferView(val) {
    var result;
    if ((typeof ArrayBuffer !== 'undefined') && (ArrayBuffer.isView)) {
      result = ArrayBuffer.isView(val);
    } else {
      result = (val) && (val.buffer) && (val.buffer instanceof ArrayBuffer);
    }
    return result;
  }
  
  /**
   * Determine if a value is a String
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if value is a String, otherwise false
   */
  function isString(val) {
    return typeof val === 'string';
  }
  
  /**
   * Determine if a value is a Number
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if value is a Number, otherwise false
   */
  function isNumber(val) {
    return typeof val === 'number';
  }
  
  /**
   * Determine if a value is undefined
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if the value is undefined, otherwise false
   */
  function isUndefined(val) {
    return typeof val === 'undefined';
  }
  
  /**
   * Determine if a value is an Object
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if value is an Object, otherwise false
   */
  function isObject(val) {
    return val !== null && typeof val === 'object';
  }
  
  /**
   * Determine if a value is a Date
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if value is a Date, otherwise false
   */
  function isDate(val) {
    return toString.call(val) === '[object Date]';
  }
  
  /**
   * Determine if a value is a File
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if value is a File, otherwise false
   */
  function isFile(val) {
    return toString.call(val) === '[object File]';
  }
  
  /**
   * Determine if a value is a Blob
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if value is a Blob, otherwise false
   */
  function isBlob(val) {
    return toString.call(val) === '[object Blob]';
  }
  
  /**
   * Determine if a value is a Function
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if value is a Function, otherwise false
   */
  function isFunction(val) {
    return toString.call(val) === '[object Function]';
  }
  
  /**
   * Determine if a value is a Stream
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if value is a Stream, otherwise false
   */
  function isStream(val) {
    return isObject(val) && isFunction(val.pipe);
  }
  
  /**
   * Determine if a value is a URLSearchParams object
   *
   * @param {Object} val The value to test
   * @returns {boolean} True if value is a URLSearchParams object, otherwise false
   */
  function isURLSearchParams(val) {
    return typeof URLSearchParams !== 'undefined' && val instanceof URLSearchParams;
  }
  
  /**
   * Trim excess whitespace off the beginning and end of a string
   *
   * @param {String} str The String to trim
   * @returns {String} The String freed of excess whitespace
   */
  function trim(str) {
    return str.replace(/^\s*/, '').replace(/\s*$/, '');
  }
  
  /**
   * Determine if we're running in a standard browser environment
   *
   * This allows axios to run in a web worker, and react-native.
   * Both environments support XMLHttpRequest, but not fully standard globals.
   *
   * web workers:
   *  typeof window -> undefined
   *  typeof document -> undefined
   *
   * react-native:
   *  navigator.product -> 'ReactNative'
   */
  function isStandardBrowserEnv() {
    if (typeof navigator !== 'undefined' && navigator.product === 'ReactNative') {
      return false;
    }
    return (
      typeof window !== 'undefined' &&
      typeof document !== 'undefined'
    );
  }
  
  /**
   * Iterate over an Array or an Object invoking a function for each item.
   *
   * If `obj` is an Array callback will be called passing
   * the value, index, and complete array for each item.
   *
   * If 'obj' is an Object callback will be called passing
   * the value, key, and complete object for each property.
   *
   * @param {Object|Array} obj The object to iterate
   * @param {Function} fn The callback to invoke for each item
   */
  function forEach(obj, fn) {
    // Don't bother if no value provided
    if (obj === null || typeof obj === 'undefined') {
      return;
    }
  
    // Force an array if not already something iterable
    if (typeof obj !== 'object') {
      /*eslint no-param-reassign:0*/
      obj = [obj];
    }
  
    if (isArray(obj)) {
      // Iterate over array values
      for (var i = 0, l = obj.length; i < l; i++) {
        fn.call(null, obj[i], i, obj);
      }
    } else {
      // Iterate over object keys
      for (var key in obj) {
        if (Object.prototype.hasOwnProperty.call(obj, key)) {
          fn.call(null, obj[key], key, obj);
        }
      }
    }
  }
  
  /**
   * Accepts varargs expecting each argument to be an object, then
   * immutably merges the properties of each object and returns result.
   *
   * When multiple objects contain the same key the later object in
   * the arguments list will take precedence.
   *
   * Example:
   *
   * ```js
   * var result = merge({foo: 123}, {foo: 456});
   * console.log(result.foo); // outputs 456
   * ```
   *
   * @param {Object} obj1 Object to merge
   * @returns {Object} Result of all merge properties
   */
  function merge(/* obj1, obj2, obj3, ... */) {
    var result = {};
    function assignValue(val, key) {
      if (typeof result[key] === 'object' && typeof val === 'object') {
        result[key] = merge(result[key], val);
      } else {
        result[key] = val;
      }
    }
  
    for (var i = 0, l = arguments.length; i < l; i++) {
      forEach(arguments[i], assignValue);
    }
    return result;
  }
  
  /**
   * Extends object a by mutably adding to it the properties of object b.
   *
   * @param {Object} a The object to be extended
   * @param {Object} b The object to copy properties from
   * @param {Object} thisArg The object to bind function to
   * @return {Object} The resulting value of object a
   */
  function extend(a, b, thisArg) {
    forEach(b, function assignValue(val, key) {
      if (thisArg && typeof val === 'function') {
        a[key] = bind(val, thisArg);
      } else {
        a[key] = val;
      }
    });
    return a;
  }
  
  module.exports = {
    isArray: isArray,
    isArrayBuffer: isArrayBuffer,
    isBuffer: isBuffer,
    isFormData: isFormData,
    isArrayBufferView: isArrayBufferView,
    isString: isString,
    isNumber: isNumber,
    isObject: isObject,
    isUndefined: isUndefined,
    isDate: isDate,
    isFile: isFile,
    isBlob: isBlob,
    isFunction: isFunction,
    isStream: isStream,
    isURLSearchParams: isURLSearchParams,
    isStandardBrowserEnv: isStandardBrowserEnv,
    forEach: forEach,
    merge: merge,
    extend: extend,
    trim: trim
  };
  
  },{"./helpers/bind":15,"is-buffer":27}],26:[function(require,module,exports){
  'use strict';
  var token = '%[a-f0-9]{2}';
  var singleMatcher = new RegExp(token, 'gi');
  var multiMatcher = new RegExp('(' + token + ')+', 'gi');
  
  function decodeComponents(components, split) {
  	try {
  		// Try to decode the entire string first
  		return decodeURIComponent(components.join(''));
  	} catch (err) {
  		// Do nothing
  	}
  
  	if (components.length === 1) {
  		return components;
  	}
  
  	split = split || 1;
  
  	// Split the array in 2 parts
  	var left = components.slice(0, split);
  	var right = components.slice(split);
  
  	return Array.prototype.concat.call([], decodeComponents(left), decodeComponents(right));
  }
  
  function decode(input) {
  	try {
  		return decodeURIComponent(input);
  	} catch (err) {
  		var tokens = input.match(singleMatcher);
  
  		for (var i = 1; i < tokens.length; i++) {
  			input = decodeComponents(tokens, i).join('');
  
  			tokens = input.match(singleMatcher);
  		}
  
  		return input;
  	}
  }
  
  function customDecodeURIComponent(input) {
  	// Keep track of all the replacements and prefill the map with the `BOM`
  	var replaceMap = {
  		'%FE%FF': '\uFFFD\uFFFD',
  		'%FF%FE': '\uFFFD\uFFFD'
  	};
  
  	var match = multiMatcher.exec(input);
  	while (match) {
  		try {
  			// Decode as big chunks as possible
  			replaceMap[match[0]] = decodeURIComponent(match[0]);
  		} catch (err) {
  			var result = decode(match[0]);
  
  			if (result !== match[0]) {
  				replaceMap[match[0]] = result;
  			}
  		}
  
  		match = multiMatcher.exec(input);
  	}
  
  	// Add `%C2` at the end of the map to make sure it does not replace the combinator before everything else
  	replaceMap['%C2'] = '\uFFFD';
  
  	var entries = Object.keys(replaceMap);
  
  	for (var i = 0; i < entries.length; i++) {
  		// Replace all decoded components
  		var key = entries[i];
  		input = input.replace(new RegExp(key, 'g'), replaceMap[key]);
  	}
  
  	return input;
  }
  
  module.exports = function (encodedURI) {
  	if (typeof encodedURI !== 'string') {
  		throw new TypeError('Expected `encodedURI` to be of type `string`, got `' + typeof encodedURI + '`');
  	}
  
  	try {
  		encodedURI = encodedURI.replace(/\+/g, ' ');
  
  		// Try the built in decoder first
  		return decodeURIComponent(encodedURI);
  	} catch (err) {
  		// Fallback to a more advanced decoder
  		return customDecodeURIComponent(encodedURI);
  	}
  };
  
  },{}],27:[function(require,module,exports){
  /*!
   * Determine if an object is a Buffer
   *
   * @author   Feross Aboukhadijeh <https://feross.org>
   * @license  MIT
   */
  
  // The _isBuffer check is for Safari 5-7 support, because it's missing
  // Object.prototype.constructor. Remove this eventually
  module.exports = function (obj) {
    return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)
  }
  
  function isBuffer (obj) {
    return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
  }
  
  // For Node v0.10 support. Remove this eventually.
  function isSlowBuffer (obj) {
    return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))
  }
  
  },{}],28:[function(require,module,exports){
  (function (global){
  /**
   * @license
   * Lodash <https://lodash.com/>
   * Copyright JS Foundation and other contributors <https://js.foundation/>
   * Released under MIT license <https://lodash.com/license>
   * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
   * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
   */
  ;(function() {
  
    /** Used as a safe reference for `undefined` in pre-ES5 environments. */
    var undefined;
  
    /** Used as the semantic version number. */
    var VERSION = '4.17.4';
  
    /** Used as the size to enable large array optimizations. */
    var LARGE_ARRAY_SIZE = 200;
  
    /** Error message constants. */
    var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',
        FUNC_ERROR_TEXT = 'Expected a function';
  
    /** Used to stand-in for `undefined` hash values. */
    var HASH_UNDEFINED = '__lodash_hash_undefined__';
  
    /** Used as the maximum memoize cache size. */
    var MAX_MEMOIZE_SIZE = 500;
  
    /** Used as the internal argument placeholder. */
    var PLACEHOLDER = '__lodash_placeholder__';
  
    /** Used to compose bitmasks for cloning. */
    var CLONE_DEEP_FLAG = 1,
        CLONE_FLAT_FLAG = 2,
        CLONE_SYMBOLS_FLAG = 4;
  
    /** Used to compose bitmasks for value comparisons. */
    var COMPARE_PARTIAL_FLAG = 1,
        COMPARE_UNORDERED_FLAG = 2;
  
    /** Used to compose bitmasks for function metadata. */
    var WRAP_BIND_FLAG = 1,
        WRAP_BIND_KEY_FLAG = 2,
        WRAP_CURRY_BOUND_FLAG = 4,
        WRAP_CURRY_FLAG = 8,
        WRAP_CURRY_RIGHT_FLAG = 16,
        WRAP_PARTIAL_FLAG = 32,
        WRAP_PARTIAL_RIGHT_FLAG = 64,
        WRAP_ARY_FLAG = 128,
        WRAP_REARG_FLAG = 256,
        WRAP_FLIP_FLAG = 512;
  
    /** Used as default options for `_.truncate`. */
    var DEFAULT_TRUNC_LENGTH = 30,
        DEFAULT_TRUNC_OMISSION = '...';
  
    /** Used to detect hot functions by number of calls within a span of milliseconds. */
    var HOT_COUNT = 800,
        HOT_SPAN = 16;
  
    /** Used to indicate the type of lazy iteratees. */
    var LAZY_FILTER_FLAG = 1,
        LAZY_MAP_FLAG = 2,
        LAZY_WHILE_FLAG = 3;
  
    /** Used as references for various `Number` constants. */
    var INFINITY = 1 / 0,
        MAX_SAFE_INTEGER = 9007199254740991,
        MAX_INTEGER = 1.7976931348623157e+308,
        NAN = 0 / 0;
  
    /** Used as references for the maximum length and index of an array. */
    var MAX_ARRAY_LENGTH = 4294967295,
        MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,
        HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;
  
    /** Used to associate wrap methods with their bit flags. */
    var wrapFlags = [
      ['ary', WRAP_ARY_FLAG],
      ['bind', WRAP_BIND_FLAG],
      ['bindKey', WRAP_BIND_KEY_FLAG],
      ['curry', WRAP_CURRY_FLAG],
      ['curryRight', WRAP_CURRY_RIGHT_FLAG],
      ['flip', WRAP_FLIP_FLAG],
      ['partial', WRAP_PARTIAL_FLAG],
      ['partialRight', WRAP_PARTIAL_RIGHT_FLAG],
      ['rearg', WRAP_REARG_FLAG]
    ];
  
    /** `Object#toString` result references. */
    var argsTag = '[object Arguments]',
        arrayTag = '[object Array]',
        asyncTag = '[object AsyncFunction]',
        boolTag = '[object Boolean]',
        dateTag = '[object Date]',
        domExcTag = '[object DOMException]',
        errorTag = '[object Error]',
        funcTag = '[object Function]',
        genTag = '[object GeneratorFunction]',
        mapTag = '[object Map]',
        numberTag = '[object Number]',
        nullTag = '[object Null]',
        objectTag = '[object Object]',
        promiseTag = '[object Promise]',
        proxyTag = '[object Proxy]',
        regexpTag = '[object RegExp]',
        setTag = '[object Set]',
        stringTag = '[object String]',
        symbolTag = '[object Symbol]',
        undefinedTag = '[object Undefined]',
        weakMapTag = '[object WeakMap]',
        weakSetTag = '[object WeakSet]';
  
    var arrayBufferTag = '[object ArrayBuffer]',
        dataViewTag = '[object DataView]',
        float32Tag = '[object Float32Array]',
        float64Tag = '[object Float64Array]',
        int8Tag = '[object Int8Array]',
        int16Tag = '[object Int16Array]',
        int32Tag = '[object Int32Array]',
        uint8Tag = '[object Uint8Array]',
        uint8ClampedTag = '[object Uint8ClampedArray]',
        uint16Tag = '[object Uint16Array]',
        uint32Tag = '[object Uint32Array]';
  
    /** Used to match empty string literals in compiled template source. */
    var reEmptyStringLeading = /\b__p \+= '';/g,
        reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
        reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;
  
    /** Used to match HTML entities and HTML characters. */
    var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,
        reUnescapedHtml = /[&<>"']/g,
        reHasEscapedHtml = RegExp(reEscapedHtml.source),
        reHasUnescapedHtml = RegExp(reUnescapedHtml.source);
  
    /** Used to match template delimiters. */
    var reEscape = /<%-([\s\S]+?)%>/g,
        reEvaluate = /<%([\s\S]+?)%>/g,
        reInterpolate = /<%=([\s\S]+?)%>/g;
  
    /** Used to match property names within property paths. */
    var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
        reIsPlainProp = /^\w*$/,
        reLeadingDot = /^\./,
        rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;
  
    /**
     * Used to match `RegExp`
     * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
     */
    var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,
        reHasRegExpChar = RegExp(reRegExpChar.source);
  
    /** Used to match leading and trailing whitespace. */
    var reTrim = /^\s+|\s+$/g,
        reTrimStart = /^\s+/,
        reTrimEnd = /\s+$/;
  
    /** Used to match wrap detail comments. */
    var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,
        reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/,
        reSplitDetails = /,? & /;
  
    /** Used to match words composed of alphanumeric characters. */
    var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;
  
    /** Used to match backslashes in property paths. */
    var reEscapeChar = /\\(\\)?/g;
  
    /**
     * Used to match
     * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).
     */
    var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
  
    /** Used to match `RegExp` flags from their coerced string values. */
    var reFlags = /\w*$/;
  
    /** Used to detect bad signed hexadecimal string values. */
    var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
  
    /** Used to detect binary string values. */
    var reIsBinary = /^0b[01]+$/i;
  
    /** Used to detect host constructors (Safari). */
    var reIsHostCtor = /^\[object .+?Constructor\]$/;
  
    /** Used to detect octal string values. */
    var reIsOctal = /^0o[0-7]+$/i;
  
    /** Used to detect unsigned integer values. */
    var reIsUint = /^(?:0|[1-9]\d*)$/;
  
    /** Used to match Latin Unicode letters (excluding mathematical operators). */
    var reLatin = /[\xc0-\xd6\xd8-\xf6\xf8-\xff\u0100-\u017f]/g;
  
    /** Used to ensure capturing order of template delimiters. */
    var reNoMatch = /($^)/;
  
    /** Used to match unescaped characters in compiled string literals. */
    var reUnescapedString = /['\n\r\u2028\u2029\\]/g;
  
    /** Used to compose unicode character classes. */
    var rsAstralRange = '\\ud800-\\udfff',
        rsComboMarksRange = '\\u0300-\\u036f',
        reComboHalfMarksRange = '\\ufe20-\\ufe2f',
        rsComboSymbolsRange = '\\u20d0-\\u20ff',
        rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
        rsDingbatRange = '\\u2700-\\u27bf',
        rsLowerRange = 'a-z\\xdf-\\xf6\\xf8-\\xff',
        rsMathOpRange = '\\xac\\xb1\\xd7\\xf7',
        rsNonCharRange = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf',
        rsPunctuationRange = '\\u2000-\\u206f',
        rsSpaceRange = ' \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000',
        rsUpperRange = 'A-Z\\xc0-\\xd6\\xd8-\\xde',
        rsVarRange = '\\ufe0e\\ufe0f',
        rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange;
  
    /** Used to compose unicode capture groups. */
    var rsApos = "['\u2019]",
        rsAstral = '[' + rsAstralRange + ']',
        rsBreak = '[' + rsBreakRange + ']',
        rsCombo = '[' + rsComboRange + ']',
        rsDigits = '\\d+',
        rsDingbat = '[' + rsDingbatRange + ']',
        rsLower = '[' + rsLowerRange + ']',
        rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']',
        rsFitz = '\\ud83c[\\udffb-\\udfff]',
        rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
        rsNonAstral = '[^' + rsAstralRange + ']',
        rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
        rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
        rsUpper = '[' + rsUpperRange + ']',
        rsZWJ = '\\u200d';
  
    /** Used to compose unicode regexes. */
    var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')',
        rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')',
        rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
        rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
        reOptMod = rsModifier + '?',
        rsOptVar = '[' + rsVarRange + ']?',
        rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
        rsOrdLower = '\\d*(?:(?:1st|2nd|3rd|(?![123])\\dth)\\b)',
        rsOrdUpper = '\\d*(?:(?:1ST|2ND|3RD|(?![123])\\dTH)\\b)',
        rsSeq = rsOptVar + reOptMod + rsOptJoin,
        rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq,
        rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
  
    /** Used to match apostrophes. */
    var reApos = RegExp(rsApos, 'g');
  
    /**
     * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and
     * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols).
     */
    var reComboMark = RegExp(rsCombo, 'g');
  
    /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
    var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
  
    /** Used to match complex or compound words. */
    var reUnicodeWord = RegExp([
      rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
      rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')',
      rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower,
      rsUpper + '+' + rsOptContrUpper,
      rsOrdUpper,
      rsOrdLower,
      rsDigits,
      rsEmoji
    ].join('|'), 'g');
  
    /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
    var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange  + rsComboRange + rsVarRange + ']');
  
    /** Used to detect strings that need a more robust regexp to match words. */
    var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2,}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;
  
    /** Used to assign default `context` object properties. */
    var contextProps = [
      'Array', 'Buffer', 'DataView', 'Date', 'Error', 'Float32Array', 'Float64Array',
      'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',
      'Promise', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array',
      'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
      '_', 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout'
    ];
  
    /** Used to make template sourceURLs easier to identify. */
    var templateCounter = -1;
  
    /** Used to identify `toStringTag` values of typed arrays. */
    var typedArrayTags = {};
    typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
    typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
    typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
    typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
    typedArrayTags[uint32Tag] = true;
    typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
    typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
    typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
    typedArrayTags[errorTag] = typedArrayTags[funcTag] =
    typedArrayTags[mapTag] = typedArrayTags[numberTag] =
    typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
    typedArrayTags[setTag] = typedArrayTags[stringTag] =
    typedArrayTags[weakMapTag] = false;
  
    /** Used to identify `toStringTag` values supported by `_.clone`. */
    var cloneableTags = {};
    cloneableTags[argsTag] = cloneableTags[arrayTag] =
    cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
    cloneableTags[boolTag] = cloneableTags[dateTag] =
    cloneableTags[float32Tag] = cloneableTags[float64Tag] =
    cloneableTags[int8Tag] = cloneableTags[int16Tag] =
    cloneableTags[int32Tag] = cloneableTags[mapTag] =
    cloneableTags[numberTag] = cloneableTags[objectTag] =
    cloneableTags[regexpTag] = cloneableTags[setTag] =
    cloneableTags[stringTag] = cloneableTags[symbolTag] =
    cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
    cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
    cloneableTags[errorTag] = cloneableTags[funcTag] =
    cloneableTags[weakMapTag] = false;
  
    /** Used to map Latin Unicode letters to basic Latin letters. */
    var deburredLetters = {
      // Latin-1 Supplement block.
      '\xc0': 'A',  '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
      '\xe0': 'a',  '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a',
      '\xc7': 'C',  '\xe7': 'c',
      '\xd0': 'D',  '\xf0': 'd',
      '\xc8': 'E',  '\xc9': 'E', '\xca': 'E', '\xcb': 'E',
      '\xe8': 'e',  '\xe9': 'e', '\xea': 'e', '\xeb': 'e',
      '\xcc': 'I',  '\xcd': 'I', '\xce': 'I', '\xcf': 'I',
      '\xec': 'i',  '\xed': 'i', '\xee': 'i', '\xef': 'i',
      '\xd1': 'N',  '\xf1': 'n',
      '\xd2': 'O',  '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O',
      '\xf2': 'o',  '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o',
      '\xd9': 'U',  '\xda': 'U', '\xdb': 'U', '\xdc': 'U',
      '\xf9': 'u',  '\xfa': 'u', '\xfb': 'u', '\xfc': 'u',
      '\xdd': 'Y',  '\xfd': 'y', '\xff': 'y',
      '\xc6': 'Ae', '\xe6': 'ae',
      '\xde': 'Th', '\xfe': 'th',
      '\xdf': 'ss',
      // Latin Extended-A block.
      '\u0100': 'A',  '\u0102': 'A', '\u0104': 'A',
      '\u0101': 'a',  '\u0103': 'a', '\u0105': 'a',
      '\u0106': 'C',  '\u0108': 'C', '\u010a': 'C', '\u010c': 'C',
      '\u0107': 'c',  '\u0109': 'c', '\u010b': 'c', '\u010d': 'c',
      '\u010e': 'D',  '\u0110': 'D', '\u010f': 'd', '\u0111': 'd',
      '\u0112': 'E',  '\u0114': 'E', '\u0116': 'E', '\u0118': 'E', '\u011a': 'E',
      '\u0113': 'e',  '\u0115': 'e', '\u0117': 'e', '\u0119': 'e', '\u011b': 'e',
      '\u011c': 'G',  '\u011e': 'G', '\u0120': 'G', '\u0122': 'G',
      '\u011d': 'g',  '\u011f': 'g', '\u0121': 'g', '\u0123': 'g',
      '\u0124': 'H',  '\u0126': 'H', '\u0125': 'h', '\u0127': 'h',
      '\u0128': 'I',  '\u012a': 'I', '\u012c': 'I', '\u012e': 'I', '\u0130': 'I',
      '\u0129': 'i',  '\u012b': 'i', '\u012d': 'i', '\u012f': 'i', '\u0131': 'i',
      '\u0134': 'J',  '\u0135': 'j',
      '\u0136': 'K',  '\u0137': 'k', '\u0138': 'k',
      '\u0139': 'L',  '\u013b': 'L', '\u013d': 'L', '\u013f': 'L', '\u0141': 'L',
      '\u013a': 'l',  '\u013c': 'l', '\u013e': 'l', '\u0140': 'l', '\u0142': 'l',
      '\u0143': 'N',  '\u0145': 'N', '\u0147': 'N', '\u014a': 'N',
      '\u0144': 'n',  '\u0146': 'n', '\u0148': 'n', '\u014b': 'n',
      '\u014c': 'O',  '\u014e': 'O', '\u0150': 'O',
      '\u014d': 'o',  '\u014f': 'o', '\u0151': 'o',
      '\u0154': 'R',  '\u0156': 'R', '\u0158': 'R',
      '\u0155': 'r',  '\u0157': 'r', '\u0159': 'r',
      '\u015a': 'S',  '\u015c': 'S', '\u015e': 'S', '\u0160': 'S',
      '\u015b': 's',  '\u015d': 's', '\u015f': 's', '\u0161': 's',
      '\u0162': 'T',  '\u0164': 'T', '\u0166': 'T',
      '\u0163': 't',  '\u0165': 't', '\u0167': 't',
      '\u0168': 'U',  '\u016a': 'U', '\u016c': 'U', '\u016e': 'U', '\u0170': 'U', '\u0172': 'U',
      '\u0169': 'u',  '\u016b': 'u', '\u016d': 'u', '\u016f': 'u', '\u0171': 'u', '\u0173': 'u',
      '\u0174': 'W',  '\u0175': 'w',
      '\u0176': 'Y',  '\u0177': 'y', '\u0178': 'Y',
      '\u0179': 'Z',  '\u017b': 'Z', '\u017d': 'Z',
      '\u017a': 'z',  '\u017c': 'z', '\u017e': 'z',
      '\u0132': 'IJ', '\u0133': 'ij',
      '\u0152': 'Oe', '\u0153': 'oe',
      '\u0149': "'n", '\u017f': 's'
    };
  
    /** Used to map characters to HTML entities. */
    var htmlEscapes = {
      '&': '&amp;',
      '<': '&lt;',
      '>': '&gt;',
      '"': '&quot;',
      "'": '&#39;'
    };
  
    /** Used to map HTML entities to characters. */
    var htmlUnescapes = {
      '&amp;': '&',
      '&lt;': '<',
      '&gt;': '>',
      '&quot;': '"',
      '&#39;': "'"
    };
  
    /** Used to escape characters for inclusion in compiled string literals. */
    var stringEscapes = {
      '\\': '\\',
      "'": "'",
      '\n': 'n',
      '\r': 'r',
      '\u2028': 'u2028',
      '\u2029': 'u2029'
    };
  
    /** Built-in method references without a dependency on `root`. */
    var freeParseFloat = parseFloat,
        freeParseInt = parseInt;
  
    /** Detect free variable `global` from Node.js. */
    var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
  
    /** Detect free variable `self`. */
    var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
  
    /** Used as a reference to the global object. */
    var root = freeGlobal || freeSelf || Function('return this')();
  
    /** Detect free variable `exports`. */
    var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
  
    /** Detect free variable `module`. */
    var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
  
    /** Detect the popular CommonJS extension `module.exports`. */
    var moduleExports = freeModule && freeModule.exports === freeExports;
  
    /** Detect free variable `process` from Node.js. */
    var freeProcess = moduleExports && freeGlobal.process;
  
    /** Used to access faster Node.js helpers. */
    var nodeUtil = (function() {
      try {
        return freeProcess && freeProcess.binding && freeProcess.binding('util');
      } catch (e) {}
    }());
  
    /* Node.js helper references. */
    var nodeIsArrayBuffer = nodeUtil && nodeUtil.isArrayBuffer,
        nodeIsDate = nodeUtil && nodeUtil.isDate,
        nodeIsMap = nodeUtil && nodeUtil.isMap,
        nodeIsRegExp = nodeUtil && nodeUtil.isRegExp,
        nodeIsSet = nodeUtil && nodeUtil.isSet,
        nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;
  
    /*--------------------------------------------------------------------------*/
  
    /**
     * Adds the key-value `pair` to `map`.
     *
     * @private
     * @param {Object} map The map to modify.
     * @param {Array} pair The key-value pair to add.
     * @returns {Object} Returns `map`.
     */
    function addMapEntry(map, pair) {
      // Don't return `map.set` because it's not chainable in IE 11.
      map.set(pair[0], pair[1]);
      return map;
    }
  
    /**
     * Adds `value` to `set`.
     *
     * @private
     * @param {Object} set The set to modify.
     * @param {*} value The value to add.
     * @returns {Object} Returns `set`.
     */
    function addSetEntry(set, value) {
      // Don't return `set.add` because it's not chainable in IE 11.
      set.add(value);
      return set;
    }
  
    /**
     * A faster alternative to `Function#apply`, this function invokes `func`
     * with the `this` binding of `thisArg` and the arguments of `args`.
     *
     * @private
     * @param {Function} func The function to invoke.
     * @param {*} thisArg The `this` binding of `func`.
     * @param {Array} args The arguments to invoke `func` with.
     * @returns {*} Returns the result of `func`.
     */
    function apply(func, thisArg, args) {
      switch (args.length) {
        case 0: return func.call(thisArg);
        case 1: return func.call(thisArg, args[0]);
        case 2: return func.call(thisArg, args[0], args[1]);
        case 3: return func.call(thisArg, args[0], args[1], args[2]);
      }
      return func.apply(thisArg, args);
    }
  
    /**
     * A specialized version of `baseAggregator` for arrays.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} setter The function to set `accumulator` values.
     * @param {Function} iteratee The iteratee to transform keys.
     * @param {Object} accumulator The initial aggregated object.
     * @returns {Function} Returns `accumulator`.
     */
    function arrayAggregator(array, setter, iteratee, accumulator) {
      var index = -1,
          length = array == null ? 0 : array.length;
  
      while (++index < length) {
        var value = array[index];
        setter(accumulator, value, iteratee(value), array);
      }
      return accumulator;
    }
  
    /**
     * A specialized version of `_.forEach` for arrays without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns `array`.
     */
    function arrayEach(array, iteratee) {
      var index = -1,
          length = array == null ? 0 : array.length;
  
      while (++index < length) {
        if (iteratee(array[index], index, array) === false) {
          break;
        }
      }
      return array;
    }
  
    /**
     * A specialized version of `_.forEachRight` for arrays without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns `array`.
     */
    function arrayEachRight(array, iteratee) {
      var length = array == null ? 0 : array.length;
  
      while (length--) {
        if (iteratee(array[length], length, array) === false) {
          break;
        }
      }
      return array;
    }
  
    /**
     * A specialized version of `_.every` for arrays without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {boolean} Returns `true` if all elements pass the predicate check,
     *  else `false`.
     */
    function arrayEvery(array, predicate) {
      var index = -1,
          length = array == null ? 0 : array.length;
  
      while (++index < length) {
        if (!predicate(array[index], index, array)) {
          return false;
        }
      }
      return true;
    }
  
    /**
     * A specialized version of `_.filter` for arrays without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {Array} Returns the new filtered array.
     */
    function arrayFilter(array, predicate) {
      var index = -1,
          length = array == null ? 0 : array.length,
          resIndex = 0,
          result = [];
  
      while (++index < length) {
        var value = array[index];
        if (predicate(value, index, array)) {
          result[resIndex++] = value;
        }
      }
      return result;
    }
  
    /**
     * A specialized version of `_.includes` for arrays without support for
     * specifying an index to search from.
     *
     * @private
     * @param {Array} [array] The array to inspect.
     * @param {*} target The value to search for.
     * @returns {boolean} Returns `true` if `target` is found, else `false`.
     */
    function arrayIncludes(array, value) {
      var length = array == null ? 0 : array.length;
      return !!length && baseIndexOf(array, value, 0) > -1;
    }
  
    /**
     * This function is like `arrayIncludes` except that it accepts a comparator.
     *
     * @private
     * @param {Array} [array] The array to inspect.
     * @param {*} target The value to search for.
     * @param {Function} comparator The comparator invoked per element.
     * @returns {boolean} Returns `true` if `target` is found, else `false`.
     */
    function arrayIncludesWith(array, value, comparator) {
      var index = -1,
          length = array == null ? 0 : array.length;
  
      while (++index < length) {
        if (comparator(value, array[index])) {
          return true;
        }
      }
      return false;
    }
  
    /**
     * A specialized version of `_.map` for arrays without support for iteratee
     * shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns the new mapped array.
     */
    function arrayMap(array, iteratee) {
      var index = -1,
          length = array == null ? 0 : array.length,
          result = Array(length);
  
      while (++index < length) {
        result[index] = iteratee(array[index], index, array);
      }
      return result;
    }
  
    /**
     * Appends the elements of `values` to `array`.
     *
     * @private
     * @param {Array} array The array to modify.
     * @param {Array} values The values to append.
     * @returns {Array} Returns `array`.
     */
    function arrayPush(array, values) {
      var index = -1,
          length = values.length,
          offset = array.length;
  
      while (++index < length) {
        array[offset + index] = values[index];
      }
      return array;
    }
  
    /**
     * A specialized version of `_.reduce` for arrays without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {*} [accumulator] The initial value.
     * @param {boolean} [initAccum] Specify using the first element of `array` as
     *  the initial value.
     * @returns {*} Returns the accumulated value.
     */
    function arrayReduce(array, iteratee, accumulator, initAccum) {
      var index = -1,
          length = array == null ? 0 : array.length;
  
      if (initAccum && length) {
        accumulator = array[++index];
      }
      while (++index < length) {
        accumulator = iteratee(accumulator, array[index], index, array);
      }
      return accumulator;
    }
  
    /**
     * A specialized version of `_.reduceRight` for arrays without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {*} [accumulator] The initial value.
     * @param {boolean} [initAccum] Specify using the last element of `array` as
     *  the initial value.
     * @returns {*} Returns the accumulated value.
     */
    function arrayReduceRight(array, iteratee, accumulator, initAccum) {
      var length = array == null ? 0 : array.length;
      if (initAccum && length) {
        accumulator = array[--length];
      }
      while (length--) {
        accumulator = iteratee(accumulator, array[length], length, array);
      }
      return accumulator;
    }
  
    /**
     * A specialized version of `_.some` for arrays without support for iteratee
     * shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {boolean} Returns `true` if any element passes the predicate check,
     *  else `false`.
     */
    function arraySome(array, predicate) {
      var index = -1,
          length = array == null ? 0 : array.length;
  
      while (++index < length) {
        if (predicate(array[index], index, array)) {
          return true;
        }
      }
      return false;
    }
  
    /**
     * Gets the size of an ASCII `string`.
     *
     * @private
     * @param {string} string The string inspect.
     * @returns {number} Returns the string size.
     */
    var asciiSize = baseProperty('length');
  
    /**
     * Converts an ASCII `string` to an array.
     *
     * @private
     * @param {string} string The string to convert.
     * @returns {Array} Returns the converted array.
     */
    function asciiToArray(string) {
      return string.split('');
    }
  
    /**
     * Splits an ASCII `string` into an array of its words.
     *
     * @private
     * @param {string} The string to inspect.
     * @returns {Array} Returns the words of `string`.
     */
    function asciiWords(string) {
      return string.match(reAsciiWord) || [];
    }
  
    /**
     * The base implementation of methods like `_.findKey` and `_.findLastKey`,
     * without support for iteratee shorthands, which iterates over `collection`
     * using `eachFunc`.
     *
     * @private
     * @param {Array|Object} collection The collection to inspect.
     * @param {Function} predicate The function invoked per iteration.
     * @param {Function} eachFunc The function to iterate over `collection`.
     * @returns {*} Returns the found element or its key, else `undefined`.
     */
    function baseFindKey(collection, predicate, eachFunc) {
      var result;
      eachFunc(collection, function(value, key, collection) {
        if (predicate(value, key, collection)) {
          result = key;
          return false;
        }
      });
      return result;
    }
  
    /**
     * The base implementation of `_.findIndex` and `_.findLastIndex` without
     * support for iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {Function} predicate The function invoked per iteration.
     * @param {number} fromIndex The index to search from.
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {number} Returns the index of the matched value, else `-1`.
     */
    function baseFindIndex(array, predicate, fromIndex, fromRight) {
      var length = array.length,
          index = fromIndex + (fromRight ? 1 : -1);
  
      while ((fromRight ? index-- : ++index < length)) {
        if (predicate(array[index], index, array)) {
          return index;
        }
      }
      return -1;
    }
  
    /**
     * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @param {number} fromIndex The index to search from.
     * @returns {number} Returns the index of the matched value, else `-1`.
     */
    function baseIndexOf(array, value, fromIndex) {
      return value === value
        ? strictIndexOf(array, value, fromIndex)
        : baseFindIndex(array, baseIsNaN, fromIndex);
    }
  
    /**
     * This function is like `baseIndexOf` except that it accepts a comparator.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @param {number} fromIndex The index to search from.
     * @param {Function} comparator The comparator invoked per element.
     * @returns {number} Returns the index of the matched value, else `-1`.
     */
    function baseIndexOfWith(array, value, fromIndex, comparator) {
      var index = fromIndex - 1,
          length = array.length;
  
      while (++index < length) {
        if (comparator(array[index], value)) {
          return index;
        }
      }
      return -1;
    }
  
    /**
     * The base implementation of `_.isNaN` without support for number objects.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
     */
    function baseIsNaN(value) {
      return value !== value;
    }
  
    /**
     * The base implementation of `_.mean` and `_.meanBy` without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {number} Returns the mean.
     */
    function baseMean(array, iteratee) {
      var length = array == null ? 0 : array.length;
      return length ? (baseSum(array, iteratee) / length) : NAN;
    }
  
    /**
     * The base implementation of `_.property` without support for deep paths.
     *
     * @private
     * @param {string} key The key of the property to get.
     * @returns {Function} Returns the new accessor function.
     */
    function baseProperty(key) {
      return function(object) {
        return object == null ? undefined : object[key];
      };
    }
  
    /**
     * The base implementation of `_.propertyOf` without support for deep paths.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Function} Returns the new accessor function.
     */
    function basePropertyOf(object) {
      return function(key) {
        return object == null ? undefined : object[key];
      };
    }
  
    /**
     * The base implementation of `_.reduce` and `_.reduceRight`, without support
     * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {*} accumulator The initial value.
     * @param {boolean} initAccum Specify using the first or last element of
     *  `collection` as the initial value.
     * @param {Function} eachFunc The function to iterate over `collection`.
     * @returns {*} Returns the accumulated value.
     */
    function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
      eachFunc(collection, function(value, index, collection) {
        accumulator = initAccum
          ? (initAccum = false, value)
          : iteratee(accumulator, value, index, collection);
      });
      return accumulator;
    }
  
    /**
     * The base implementation of `_.sortBy` which uses `comparer` to define the
     * sort order of `array` and replaces criteria objects with their corresponding
     * values.
     *
     * @private
     * @param {Array} array The array to sort.
     * @param {Function} comparer The function to define sort order.
     * @returns {Array} Returns `array`.
     */
    function baseSortBy(array, comparer) {
      var length = array.length;
  
      array.sort(comparer);
      while (length--) {
        array[length] = array[length].value;
      }
      return array;
    }
  
    /**
     * The base implementation of `_.sum` and `_.sumBy` without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {number} Returns the sum.
     */
    function baseSum(array, iteratee) {
      var result,
          index = -1,
          length = array.length;
  
      while (++index < length) {
        var current = iteratee(array[index]);
        if (current !== undefined) {
          result = result === undefined ? current : (result + current);
        }
      }
      return result;
    }
  
    /**
     * The base implementation of `_.times` without support for iteratee shorthands
     * or max array length checks.
     *
     * @private
     * @param {number} n The number of times to invoke `iteratee`.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns the array of results.
     */
    function baseTimes(n, iteratee) {
      var index = -1,
          result = Array(n);
  
      while (++index < n) {
        result[index] = iteratee(index);
      }
      return result;
    }
  
    /**
     * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array
     * of key-value pairs for `object` corresponding to the property names of `props`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array} props The property names to get values for.
     * @returns {Object} Returns the key-value pairs.
     */
    function baseToPairs(object, props) {
      return arrayMap(props, function(key) {
        return [key, object[key]];
      });
    }
  
    /**
     * The base implementation of `_.unary` without support for storing metadata.
     *
     * @private
     * @param {Function} func The function to cap arguments for.
     * @returns {Function} Returns the new capped function.
     */
    function baseUnary(func) {
      return function(value) {
        return func(value);
      };
    }
  
    /**
     * The base implementation of `_.values` and `_.valuesIn` which creates an
     * array of `object` property values corresponding to the property names
     * of `props`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array} props The property names to get values for.
     * @returns {Object} Returns the array of property values.
     */
    function baseValues(object, props) {
      return arrayMap(props, function(key) {
        return object[key];
      });
    }
  
    /**
     * Checks if a `cache` value for `key` exists.
     *
     * @private
     * @param {Object} cache The cache to query.
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function cacheHas(cache, key) {
      return cache.has(key);
    }
  
    /**
     * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
     * that is not found in the character symbols.
     *
     * @private
     * @param {Array} strSymbols The string symbols to inspect.
     * @param {Array} chrSymbols The character symbols to find.
     * @returns {number} Returns the index of the first unmatched string symbol.
     */
    function charsStartIndex(strSymbols, chrSymbols) {
      var index = -1,
          length = strSymbols.length;
  
      while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
      return index;
    }
  
    /**
     * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
     * that is not found in the character symbols.
     *
     * @private
     * @param {Array} strSymbols The string symbols to inspect.
     * @param {Array} chrSymbols The character symbols to find.
     * @returns {number} Returns the index of the last unmatched string symbol.
     */
    function charsEndIndex(strSymbols, chrSymbols) {
      var index = strSymbols.length;
  
      while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
      return index;
    }
  
    /**
     * Gets the number of `placeholder` occurrences in `array`.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {*} placeholder The placeholder to search for.
     * @returns {number} Returns the placeholder count.
     */
    function countHolders(array, placeholder) {
      var length = array.length,
          result = 0;
  
      while (length--) {
        if (array[length] === placeholder) {
          ++result;
        }
      }
      return result;
    }
  
    /**
     * Used by `_.deburr` to convert Latin-1 Supplement and Latin Extended-A
     * letters to basic Latin letters.
     *
     * @private
     * @param {string} letter The matched letter to deburr.
     * @returns {string} Returns the deburred letter.
     */
    var deburrLetter = basePropertyOf(deburredLetters);
  
    /**
     * Used by `_.escape` to convert characters to HTML entities.
     *
     * @private
     * @param {string} chr The matched character to escape.
     * @returns {string} Returns the escaped character.
     */
    var escapeHtmlChar = basePropertyOf(htmlEscapes);
  
    /**
     * Used by `_.template` to escape characters for inclusion in compiled string literals.
     *
     * @private
     * @param {string} chr The matched character to escape.
     * @returns {string} Returns the escaped character.
     */
    function escapeStringChar(chr) {
      return '\\' + stringEscapes[chr];
    }
  
    /**
     * Gets the value at `key` of `object`.
     *
     * @private
     * @param {Object} [object] The object to query.
     * @param {string} key The key of the property to get.
     * @returns {*} Returns the property value.
     */
    function getValue(object, key) {
      return object == null ? undefined : object[key];
    }
  
    /**
     * Checks if `string` contains Unicode symbols.
     *
     * @private
     * @param {string} string The string to inspect.
     * @returns {boolean} Returns `true` if a symbol is found, else `false`.
     */
    function hasUnicode(string) {
      return reHasUnicode.test(string);
    }
  
    /**
     * Checks if `string` contains a word composed of Unicode symbols.
     *
     * @private
     * @param {string} string The string to inspect.
     * @returns {boolean} Returns `true` if a word is found, else `false`.
     */
    function hasUnicodeWord(string) {
      return reHasUnicodeWord.test(string);
    }
  
    /**
     * Converts `iterator` to an array.
     *
     * @private
     * @param {Object} iterator The iterator to convert.
     * @returns {Array} Returns the converted array.
     */
    function iteratorToArray(iterator) {
      var data,
          result = [];
  
      while (!(data = iterator.next()).done) {
        result.push(data.value);
      }
      return result;
    }
  
    /**
     * Converts `map` to its key-value pairs.
     *
     * @private
     * @param {Object} map The map to convert.
     * @returns {Array} Returns the key-value pairs.
     */
    function mapToArray(map) {
      var index = -1,
          result = Array(map.size);
  
      map.forEach(function(value, key) {
        result[++index] = [key, value];
      });
      return result;
    }
  
    /**
     * Creates a unary function that invokes `func` with its argument transformed.
     *
     * @private
     * @param {Function} func The function to wrap.
     * @param {Function} transform The argument transform.
     * @returns {Function} Returns the new function.
     */
    function overArg(func, transform) {
      return function(arg) {
        return func(transform(arg));
      };
    }
  
    /**
     * Replaces all `placeholder` elements in `array` with an internal placeholder
     * and returns an array of their indexes.
     *
     * @private
     * @param {Array} array The array to modify.
     * @param {*} placeholder The placeholder to replace.
     * @returns {Array} Returns the new array of placeholder indexes.
     */
    function replaceHolders(array, placeholder) {
      var index = -1,
          length = array.length,
          resIndex = 0,
          result = [];
  
      while (++index < length) {
        var value = array[index];
        if (value === placeholder || value === PLACEHOLDER) {
          array[index] = PLACEHOLDER;
          result[resIndex++] = index;
        }
      }
      return result;
    }
  
    /**
     * Converts `set` to an array of its values.
     *
     * @private
     * @param {Object} set The set to convert.
     * @returns {Array} Returns the values.
     */
    function setToArray(set) {
      var index = -1,
          result = Array(set.size);
  
      set.forEach(function(value) {
        result[++index] = value;
      });
      return result;
    }
  
    /**
     * Converts `set` to its value-value pairs.
     *
     * @private
     * @param {Object} set The set to convert.
     * @returns {Array} Returns the value-value pairs.
     */
    function setToPairs(set) {
      var index = -1,
          result = Array(set.size);
  
      set.forEach(function(value) {
        result[++index] = [value, value];
      });
      return result;
    }
  
    /**
     * A specialized version of `_.indexOf` which performs strict equality
     * comparisons of values, i.e. `===`.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @param {number} fromIndex The index to search from.
     * @returns {number} Returns the index of the matched value, else `-1`.
     */
    function strictIndexOf(array, value, fromIndex) {
      var index = fromIndex - 1,
          length = array.length;
  
      while (++index < length) {
        if (array[index] === value) {
          return index;
        }
      }
      return -1;
    }
  
    /**
     * A specialized version of `_.lastIndexOf` which performs strict equality
     * comparisons of values, i.e. `===`.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @param {number} fromIndex The index to search from.
     * @returns {number} Returns the index of the matched value, else `-1`.
     */
    function strictLastIndexOf(array, value, fromIndex) {
      var index = fromIndex + 1;
      while (index--) {
        if (array[index] === value) {
          return index;
        }
      }
      return index;
    }
  
    /**
     * Gets the number of symbols in `string`.
     *
     * @private
     * @param {string} string The string to inspect.
     * @returns {number} Returns the string size.
     */
    function stringSize(string) {
      return hasUnicode(string)
        ? unicodeSize(string)
        : asciiSize(string);
    }
  
    /**
     * Converts `string` to an array.
     *
     * @private
     * @param {string} string The string to convert.
     * @returns {Array} Returns the converted array.
     */
    function stringToArray(string) {
      return hasUnicode(string)
        ? unicodeToArray(string)
        : asciiToArray(string);
    }
  
    /**
     * Used by `_.unescape` to convert HTML entities to characters.
     *
     * @private
     * @param {string} chr The matched character to unescape.
     * @returns {string} Returns the unescaped character.
     */
    var unescapeHtmlChar = basePropertyOf(htmlUnescapes);
  
    /**
     * Gets the size of a Unicode `string`.
     *
     * @private
     * @param {string} string The string inspect.
     * @returns {number} Returns the string size.
     */
    function unicodeSize(string) {
      var result = reUnicode.lastIndex = 0;
      while (reUnicode.test(string)) {
        ++result;
      }
      return result;
    }
  
    /**
     * Converts a Unicode `string` to an array.
     *
     * @private
     * @param {string} string The string to convert.
     * @returns {Array} Returns the converted array.
     */
    function unicodeToArray(string) {
      return string.match(reUnicode) || [];
    }
  
    /**
     * Splits a Unicode `string` into an array of its words.
     *
     * @private
     * @param {string} The string to inspect.
     * @returns {Array} Returns the words of `string`.
     */
    function unicodeWords(string) {
      return string.match(reUnicodeWord) || [];
    }
  
    /*--------------------------------------------------------------------------*/
  
    /**
     * Create a new pristine `lodash` function using the `context` object.
     *
     * @static
     * @memberOf _
     * @since 1.1.0
     * @category Util
     * @param {Object} [context=root] The context object.
     * @returns {Function} Returns a new `lodash` function.
     * @example
     *
     * _.mixin({ 'foo': _.constant('foo') });
     *
     * var lodash = _.runInContext();
     * lodash.mixin({ 'bar': lodash.constant('bar') });
     *
     * _.isFunction(_.foo);
     * // => true
     * _.isFunction(_.bar);
     * // => false
     *
     * lodash.isFunction(lodash.foo);
     * // => false
     * lodash.isFunction(lodash.bar);
     * // => true
     *
     * // Create a suped-up `defer` in Node.js.
     * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
     */
    var runInContext = (function runInContext(context) {
      context = context == null ? root : _.defaults(root.Object(), context, _.pick(root, contextProps));
  
      /** Built-in constructor references. */
      var Array = context.Array,
          Date = context.Date,
          Error = context.Error,
          Function = context.Function,
          Math = context.Math,
          Object = context.Object,
          RegExp = context.RegExp,
          String = context.String,
          TypeError = context.TypeError;
  
      /** Used for built-in method references. */
      var arrayProto = Array.prototype,
          funcProto = Function.prototype,
          objectProto = Object.prototype;
  
      /** Used to detect overreaching core-js shims. */
      var coreJsData = context['__core-js_shared__'];
  
      /** Used to resolve the decompiled source of functions. */
      var funcToString = funcProto.toString;
  
      /** Used to check objects for own properties. */
      var hasOwnProperty = objectProto.hasOwnProperty;
  
      /** Used to generate unique IDs. */
      var idCounter = 0;
  
      /** Used to detect methods masquerading as native. */
      var maskSrcKey = (function() {
        var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
        return uid ? ('Symbol(src)_1.' + uid) : '';
      }());
  
      /**
       * Used to resolve the
       * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
       * of values.
       */
      var nativeObjectToString = objectProto.toString;
  
      /** Used to infer the `Object` constructor. */
      var objectCtorString = funcToString.call(Object);
  
      /** Used to restore the original `_` reference in `_.noConflict`. */
      var oldDash = root._;
  
      /** Used to detect if a method is native. */
      var reIsNative = RegExp('^' +
        funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
        .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
      );
  
      /** Built-in value references. */
      var Buffer = moduleExports ? context.Buffer : undefined,
          Symbol = context.Symbol,
          Uint8Array = context.Uint8Array,
          allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined,
          getPrototype = overArg(Object.getPrototypeOf, Object),
          objectCreate = Object.create,
          propertyIsEnumerable = objectProto.propertyIsEnumerable,
          splice = arrayProto.splice,
          spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined,
          symIterator = Symbol ? Symbol.iterator : undefined,
          symToStringTag = Symbol ? Symbol.toStringTag : undefined;
  
      var defineProperty = (function() {
        try {
          var func = getNative(Object, 'defineProperty');
          func({}, '', {});
          return func;
        } catch (e) {}
      }());
  
      /** Mocked built-ins. */
      var ctxClearTimeout = context.clearTimeout !== root.clearTimeout && context.clearTimeout,
          ctxNow = Date && Date.now !== root.Date.now && Date.now,
          ctxSetTimeout = context.setTimeout !== root.setTimeout && context.setTimeout;
  
      /* Built-in method references for those with the same name as other `lodash` methods. */
      var nativeCeil = Math.ceil,
          nativeFloor = Math.floor,
          nativeGetSymbols = Object.getOwnPropertySymbols,
          nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
          nativeIsFinite = context.isFinite,
          nativeJoin = arrayProto.join,
          nativeKeys = overArg(Object.keys, Object),
          nativeMax = Math.max,
          nativeMin = Math.min,
          nativeNow = Date.now,
          nativeParseInt = context.parseInt,
          nativeRandom = Math.random,
          nativeReverse = arrayProto.reverse;
  
      /* Built-in method references that are verified to be native. */
      var DataView = getNative(context, 'DataView'),
          Map = getNative(context, 'Map'),
          Promise = getNative(context, 'Promise'),
          Set = getNative(context, 'Set'),
          WeakMap = getNative(context, 'WeakMap'),
          nativeCreate = getNative(Object, 'create');
  
      /** Used to store function metadata. */
      var metaMap = WeakMap && new WeakMap;
  
      /** Used to lookup unminified function names. */
      var realNames = {};
  
      /** Used to detect maps, sets, and weakmaps. */
      var dataViewCtorString = toSource(DataView),
          mapCtorString = toSource(Map),
          promiseCtorString = toSource(Promise),
          setCtorString = toSource(Set),
          weakMapCtorString = toSource(WeakMap);
  
      /** Used to convert symbols to primitives and strings. */
      var symbolProto = Symbol ? Symbol.prototype : undefined,
          symbolValueOf = symbolProto ? symbolProto.valueOf : undefined,
          symbolToString = symbolProto ? symbolProto.toString : undefined;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates a `lodash` object which wraps `value` to enable implicit method
       * chain sequences. Methods that operate on and return arrays, collections,
       * and functions can be chained together. Methods that retrieve a single value
       * or may return a primitive value will automatically end the chain sequence
       * and return the unwrapped value. Otherwise, the value must be unwrapped
       * with `_#value`.
       *
       * Explicit chain sequences, which must be unwrapped with `_#value`, may be
       * enabled using `_.chain`.
       *
       * The execution of chained methods is lazy, that is, it's deferred until
       * `_#value` is implicitly or explicitly called.
       *
       * Lazy evaluation allows several methods to support shortcut fusion.
       * Shortcut fusion is an optimization to merge iteratee calls; this avoids
       * the creation of intermediate arrays and can greatly reduce the number of
       * iteratee executions. Sections of a chain sequence qualify for shortcut
       * fusion if the section is applied to an array and iteratees accept only
       * one argument. The heuristic for whether a section qualifies for shortcut
       * fusion is subject to change.
       *
       * Chaining is supported in custom builds as long as the `_#value` method is
       * directly or indirectly included in the build.
       *
       * In addition to lodash methods, wrappers have `Array` and `String` methods.
       *
       * The wrapper `Array` methods are:
       * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`
       *
       * The wrapper `String` methods are:
       * `replace` and `split`
       *
       * The wrapper methods that support shortcut fusion are:
       * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,
       * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,
       * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
       *
       * The chainable wrapper methods are:
       * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
       * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
       * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
       * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,
       * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,
       * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,
       * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,
       * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,
       * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,
       * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,
       * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,
       * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,
       * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,
       * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,
       * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,
       * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,
       * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,
       * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,
       * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,
       * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,
       * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,
       * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,
       * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,
       * `zipObject`, `zipObjectDeep`, and `zipWith`
       *
       * The wrapper methods that are **not** chainable by default are:
       * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
       * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,
       * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,
       * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
       * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,
       * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,
       * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,
       * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,
       * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,
       * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,
       * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
       * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
       * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,
       * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,
       * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,
       * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,
       * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,
       * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,
       * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
       * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,
       * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,
       * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,
       * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,
       * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,
       * `upperFirst`, `value`, and `words`
       *
       * @name _
       * @constructor
       * @category Seq
       * @param {*} value The value to wrap in a `lodash` instance.
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * function square(n) {
       *   return n * n;
       * }
       *
       * var wrapped = _([1, 2, 3]);
       *
       * // Returns an unwrapped value.
       * wrapped.reduce(_.add);
       * // => 6
       *
       * // Returns a wrapped value.
       * var squares = wrapped.map(square);
       *
       * _.isArray(squares);
       * // => false
       *
       * _.isArray(squares.value());
       * // => true
       */
      function lodash(value) {
        if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
          if (value instanceof LodashWrapper) {
            return value;
          }
          if (hasOwnProperty.call(value, '__wrapped__')) {
            return wrapperClone(value);
          }
        }
        return new LodashWrapper(value);
      }
  
      /**
       * The base implementation of `_.create` without support for assigning
       * properties to the created object.
       *
       * @private
       * @param {Object} proto The object to inherit from.
       * @returns {Object} Returns the new object.
       */
      var baseCreate = (function() {
        function object() {}
        return function(proto) {
          if (!isObject(proto)) {
            return {};
          }
          if (objectCreate) {
            return objectCreate(proto);
          }
          object.prototype = proto;
          var result = new object;
          object.prototype = undefined;
          return result;
        };
      }());
  
      /**
       * The function whose prototype chain sequence wrappers inherit from.
       *
       * @private
       */
      function baseLodash() {
        // No operation performed.
      }
  
      /**
       * The base constructor for creating `lodash` wrapper objects.
       *
       * @private
       * @param {*} value The value to wrap.
       * @param {boolean} [chainAll] Enable explicit method chain sequences.
       */
      function LodashWrapper(value, chainAll) {
        this.__wrapped__ = value;
        this.__actions__ = [];
        this.__chain__ = !!chainAll;
        this.__index__ = 0;
        this.__values__ = undefined;
      }
  
      /**
       * By default, the template delimiters used by lodash are like those in
       * embedded Ruby (ERB) as well as ES2015 template strings. Change the
       * following template settings to use alternative delimiters.
       *
       * @static
       * @memberOf _
       * @type {Object}
       */
      lodash.templateSettings = {
  
        /**
         * Used to detect `data` property values to be HTML-escaped.
         *
         * @memberOf _.templateSettings
         * @type {RegExp}
         */
        'escape': reEscape,
  
        /**
         * Used to detect code to be evaluated.
         *
         * @memberOf _.templateSettings
         * @type {RegExp}
         */
        'evaluate': reEvaluate,
  
        /**
         * Used to detect `data` property values to inject.
         *
         * @memberOf _.templateSettings
         * @type {RegExp}
         */
        'interpolate': reInterpolate,
  
        /**
         * Used to reference the data object in the template text.
         *
         * @memberOf _.templateSettings
         * @type {string}
         */
        'variable': '',
  
        /**
         * Used to import variables into the compiled template.
         *
         * @memberOf _.templateSettings
         * @type {Object}
         */
        'imports': {
  
          /**
           * A reference to the `lodash` function.
           *
           * @memberOf _.templateSettings.imports
           * @type {Function}
           */
          '_': lodash
        }
      };
  
      // Ensure wrappers are instances of `baseLodash`.
      lodash.prototype = baseLodash.prototype;
      lodash.prototype.constructor = lodash;
  
      LodashWrapper.prototype = baseCreate(baseLodash.prototype);
      LodashWrapper.prototype.constructor = LodashWrapper;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
       *
       * @private
       * @constructor
       * @param {*} value The value to wrap.
       */
      function LazyWrapper(value) {
        this.__wrapped__ = value;
        this.__actions__ = [];
        this.__dir__ = 1;
        this.__filtered__ = false;
        this.__iteratees__ = [];
        this.__takeCount__ = MAX_ARRAY_LENGTH;
        this.__views__ = [];
      }
  
      /**
       * Creates a clone of the lazy wrapper object.
       *
       * @private
       * @name clone
       * @memberOf LazyWrapper
       * @returns {Object} Returns the cloned `LazyWrapper` object.
       */
      function lazyClone() {
        var result = new LazyWrapper(this.__wrapped__);
        result.__actions__ = copyArray(this.__actions__);
        result.__dir__ = this.__dir__;
        result.__filtered__ = this.__filtered__;
        result.__iteratees__ = copyArray(this.__iteratees__);
        result.__takeCount__ = this.__takeCount__;
        result.__views__ = copyArray(this.__views__);
        return result;
      }
  
      /**
       * Reverses the direction of lazy iteration.
       *
       * @private
       * @name reverse
       * @memberOf LazyWrapper
       * @returns {Object} Returns the new reversed `LazyWrapper` object.
       */
      function lazyReverse() {
        if (this.__filtered__) {
          var result = new LazyWrapper(this);
          result.__dir__ = -1;
          result.__filtered__ = true;
        } else {
          result = this.clone();
          result.__dir__ *= -1;
        }
        return result;
      }
  
      /**
       * Extracts the unwrapped value from its lazy wrapper.
       *
       * @private
       * @name value
       * @memberOf LazyWrapper
       * @returns {*} Returns the unwrapped value.
       */
      function lazyValue() {
        var array = this.__wrapped__.value(),
            dir = this.__dir__,
            isArr = isArray(array),
            isRight = dir < 0,
            arrLength = isArr ? array.length : 0,
            view = getView(0, arrLength, this.__views__),
            start = view.start,
            end = view.end,
            length = end - start,
            index = isRight ? end : (start - 1),
            iteratees = this.__iteratees__,
            iterLength = iteratees.length,
            resIndex = 0,
            takeCount = nativeMin(length, this.__takeCount__);
  
        if (!isArr || (!isRight && arrLength == length && takeCount == length)) {
          return baseWrapperValue(array, this.__actions__);
        }
        var result = [];
  
        outer:
        while (length-- && resIndex < takeCount) {
          index += dir;
  
          var iterIndex = -1,
              value = array[index];
  
          while (++iterIndex < iterLength) {
            var data = iteratees[iterIndex],
                iteratee = data.iteratee,
                type = data.type,
                computed = iteratee(value);
  
            if (type == LAZY_MAP_FLAG) {
              value = computed;
            } else if (!computed) {
              if (type == LAZY_FILTER_FLAG) {
                continue outer;
              } else {
                break outer;
              }
            }
          }
          result[resIndex++] = value;
        }
        return result;
      }
  
      // Ensure `LazyWrapper` is an instance of `baseLodash`.
      LazyWrapper.prototype = baseCreate(baseLodash.prototype);
      LazyWrapper.prototype.constructor = LazyWrapper;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates a hash object.
       *
       * @private
       * @constructor
       * @param {Array} [entries] The key-value pairs to cache.
       */
      function Hash(entries) {
        var index = -1,
            length = entries == null ? 0 : entries.length;
  
        this.clear();
        while (++index < length) {
          var entry = entries[index];
          this.set(entry[0], entry[1]);
        }
      }
  
      /**
       * Removes all key-value entries from the hash.
       *
       * @private
       * @name clear
       * @memberOf Hash
       */
      function hashClear() {
        this.__data__ = nativeCreate ? nativeCreate(null) : {};
        this.size = 0;
      }
  
      /**
       * Removes `key` and its value from the hash.
       *
       * @private
       * @name delete
       * @memberOf Hash
       * @param {Object} hash The hash to modify.
       * @param {string} key The key of the value to remove.
       * @returns {boolean} Returns `true` if the entry was removed, else `false`.
       */
      function hashDelete(key) {
        var result = this.has(key) && delete this.__data__[key];
        this.size -= result ? 1 : 0;
        return result;
      }
  
      /**
       * Gets the hash value for `key`.
       *
       * @private
       * @name get
       * @memberOf Hash
       * @param {string} key The key of the value to get.
       * @returns {*} Returns the entry value.
       */
      function hashGet(key) {
        var data = this.__data__;
        if (nativeCreate) {
          var result = data[key];
          return result === HASH_UNDEFINED ? undefined : result;
        }
        return hasOwnProperty.call(data, key) ? data[key] : undefined;
      }
  
      /**
       * Checks if a hash value for `key` exists.
       *
       * @private
       * @name has
       * @memberOf Hash
       * @param {string} key The key of the entry to check.
       * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
       */
      function hashHas(key) {
        var data = this.__data__;
        return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);
      }
  
      /**
       * Sets the hash `key` to `value`.
       *
       * @private
       * @name set
       * @memberOf Hash
       * @param {string} key The key of the value to set.
       * @param {*} value The value to set.
       * @returns {Object} Returns the hash instance.
       */
      function hashSet(key, value) {
        var data = this.__data__;
        this.size += this.has(key) ? 0 : 1;
        data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
        return this;
      }
  
      // Add methods to `Hash`.
      Hash.prototype.clear = hashClear;
      Hash.prototype['delete'] = hashDelete;
      Hash.prototype.get = hashGet;
      Hash.prototype.has = hashHas;
      Hash.prototype.set = hashSet;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates an list cache object.
       *
       * @private
       * @constructor
       * @param {Array} [entries] The key-value pairs to cache.
       */
      function ListCache(entries) {
        var index = -1,
            length = entries == null ? 0 : entries.length;
  
        this.clear();
        while (++index < length) {
          var entry = entries[index];
          this.set(entry[0], entry[1]);
        }
      }
  
      /**
       * Removes all key-value entries from the list cache.
       *
       * @private
       * @name clear
       * @memberOf ListCache
       */
      function listCacheClear() {
        this.__data__ = [];
        this.size = 0;
      }
  
      /**
       * Removes `key` and its value from the list cache.
       *
       * @private
       * @name delete
       * @memberOf ListCache
       * @param {string} key The key of the value to remove.
       * @returns {boolean} Returns `true` if the entry was removed, else `false`.
       */
      function listCacheDelete(key) {
        var data = this.__data__,
            index = assocIndexOf(data, key);
  
        if (index < 0) {
          return false;
        }
        var lastIndex = data.length - 1;
        if (index == lastIndex) {
          data.pop();
        } else {
          splice.call(data, index, 1);
        }
        --this.size;
        return true;
      }
  
      /**
       * Gets the list cache value for `key`.
       *
       * @private
       * @name get
       * @memberOf ListCache
       * @param {string} key The key of the value to get.
       * @returns {*} Returns the entry value.
       */
      function listCacheGet(key) {
        var data = this.__data__,
            index = assocIndexOf(data, key);
  
        return index < 0 ? undefined : data[index][1];
      }
  
      /**
       * Checks if a list cache value for `key` exists.
       *
       * @private
       * @name has
       * @memberOf ListCache
       * @param {string} key The key of the entry to check.
       * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
       */
      function listCacheHas(key) {
        return assocIndexOf(this.__data__, key) > -1;
      }
  
      /**
       * Sets the list cache `key` to `value`.
       *
       * @private
       * @name set
       * @memberOf ListCache
       * @param {string} key The key of the value to set.
       * @param {*} value The value to set.
       * @returns {Object} Returns the list cache instance.
       */
      function listCacheSet(key, value) {
        var data = this.__data__,
            index = assocIndexOf(data, key);
  
        if (index < 0) {
          ++this.size;
          data.push([key, value]);
        } else {
          data[index][1] = value;
        }
        return this;
      }
  
      // Add methods to `ListCache`.
      ListCache.prototype.clear = listCacheClear;
      ListCache.prototype['delete'] = listCacheDelete;
      ListCache.prototype.get = listCacheGet;
      ListCache.prototype.has = listCacheHas;
      ListCache.prototype.set = listCacheSet;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates a map cache object to store key-value pairs.
       *
       * @private
       * @constructor
       * @param {Array} [entries] The key-value pairs to cache.
       */
      function MapCache(entries) {
        var index = -1,
            length = entries == null ? 0 : entries.length;
  
        this.clear();
        while (++index < length) {
          var entry = entries[index];
          this.set(entry[0], entry[1]);
        }
      }
  
      /**
       * Removes all key-value entries from the map.
       *
       * @private
       * @name clear
       * @memberOf MapCache
       */
      function mapCacheClear() {
        this.size = 0;
        this.__data__ = {
          'hash': new Hash,
          'map': new (Map || ListCache),
          'string': new Hash
        };
      }
  
      /**
       * Removes `key` and its value from the map.
       *
       * @private
       * @name delete
       * @memberOf MapCache
       * @param {string} key The key of the value to remove.
       * @returns {boolean} Returns `true` if the entry was removed, else `false`.
       */
      function mapCacheDelete(key) {
        var result = getMapData(this, key)['delete'](key);
        this.size -= result ? 1 : 0;
        return result;
      }
  
      /**
       * Gets the map value for `key`.
       *
       * @private
       * @name get
       * @memberOf MapCache
       * @param {string} key The key of the value to get.
       * @returns {*} Returns the entry value.
       */
      function mapCacheGet(key) {
        return getMapData(this, key).get(key);
      }
  
      /**
       * Checks if a map value for `key` exists.
       *
       * @private
       * @name has
       * @memberOf MapCache
       * @param {string} key The key of the entry to check.
       * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
       */
      function mapCacheHas(key) {
        return getMapData(this, key).has(key);
      }
  
      /**
       * Sets the map `key` to `value`.
       *
       * @private
       * @name set
       * @memberOf MapCache
       * @param {string} key The key of the value to set.
       * @param {*} value The value to set.
       * @returns {Object} Returns the map cache instance.
       */
      function mapCacheSet(key, value) {
        var data = getMapData(this, key),
            size = data.size;
  
        data.set(key, value);
        this.size += data.size == size ? 0 : 1;
        return this;
      }
  
      // Add methods to `MapCache`.
      MapCache.prototype.clear = mapCacheClear;
      MapCache.prototype['delete'] = mapCacheDelete;
      MapCache.prototype.get = mapCacheGet;
      MapCache.prototype.has = mapCacheHas;
      MapCache.prototype.set = mapCacheSet;
  
      /*------------------------------------------------------------------------*/
  
      /**
       *
       * Creates an array cache object to store unique values.
       *
       * @private
       * @constructor
       * @param {Array} [values] The values to cache.
       */
      function SetCache(values) {
        var index = -1,
            length = values == null ? 0 : values.length;
  
        this.__data__ = new MapCache;
        while (++index < length) {
          this.add(values[index]);
        }
      }
  
      /**
       * Adds `value` to the array cache.
       *
       * @private
       * @name add
       * @memberOf SetCache
       * @alias push
       * @param {*} value The value to cache.
       * @returns {Object} Returns the cache instance.
       */
      function setCacheAdd(value) {
        this.__data__.set(value, HASH_UNDEFINED);
        return this;
      }
  
      /**
       * Checks if `value` is in the array cache.
       *
       * @private
       * @name has
       * @memberOf SetCache
       * @param {*} value The value to search for.
       * @returns {number} Returns `true` if `value` is found, else `false`.
       */
      function setCacheHas(value) {
        return this.__data__.has(value);
      }
  
      // Add methods to `SetCache`.
      SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
      SetCache.prototype.has = setCacheHas;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates a stack cache object to store key-value pairs.
       *
       * @private
       * @constructor
       * @param {Array} [entries] The key-value pairs to cache.
       */
      function Stack(entries) {
        var data = this.__data__ = new ListCache(entries);
        this.size = data.size;
      }
  
      /**
       * Removes all key-value entries from the stack.
       *
       * @private
       * @name clear
       * @memberOf Stack
       */
      function stackClear() {
        this.__data__ = new ListCache;
        this.size = 0;
      }
  
      /**
       * Removes `key` and its value from the stack.
       *
       * @private
       * @name delete
       * @memberOf Stack
       * @param {string} key The key of the value to remove.
       * @returns {boolean} Returns `true` if the entry was removed, else `false`.
       */
      function stackDelete(key) {
        var data = this.__data__,
            result = data['delete'](key);
  
        this.size = data.size;
        return result;
      }
  
      /**
       * Gets the stack value for `key`.
       *
       * @private
       * @name get
       * @memberOf Stack
       * @param {string} key The key of the value to get.
       * @returns {*} Returns the entry value.
       */
      function stackGet(key) {
        return this.__data__.get(key);
      }
  
      /**
       * Checks if a stack value for `key` exists.
       *
       * @private
       * @name has
       * @memberOf Stack
       * @param {string} key The key of the entry to check.
       * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
       */
      function stackHas(key) {
        return this.__data__.has(key);
      }
  
      /**
       * Sets the stack `key` to `value`.
       *
       * @private
       * @name set
       * @memberOf Stack
       * @param {string} key The key of the value to set.
       * @param {*} value The value to set.
       * @returns {Object} Returns the stack cache instance.
       */
      function stackSet(key, value) {
        var data = this.__data__;
        if (data instanceof ListCache) {
          var pairs = data.__data__;
          if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
            pairs.push([key, value]);
            this.size = ++data.size;
            return this;
          }
          data = this.__data__ = new MapCache(pairs);
        }
        data.set(key, value);
        this.size = data.size;
        return this;
      }
  
      // Add methods to `Stack`.
      Stack.prototype.clear = stackClear;
      Stack.prototype['delete'] = stackDelete;
      Stack.prototype.get = stackGet;
      Stack.prototype.has = stackHas;
      Stack.prototype.set = stackSet;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates an array of the enumerable property names of the array-like `value`.
       *
       * @private
       * @param {*} value The value to query.
       * @param {boolean} inherited Specify returning inherited property names.
       * @returns {Array} Returns the array of property names.
       */
      function arrayLikeKeys(value, inherited) {
        var isArr = isArray(value),
            isArg = !isArr && isArguments(value),
            isBuff = !isArr && !isArg && isBuffer(value),
            isType = !isArr && !isArg && !isBuff && isTypedArray(value),
            skipIndexes = isArr || isArg || isBuff || isType,
            result = skipIndexes ? baseTimes(value.length, String) : [],
            length = result.length;
  
        for (var key in value) {
          if ((inherited || hasOwnProperty.call(value, key)) &&
              !(skipIndexes && (
                 // Safari 9 has enumerable `arguments.length` in strict mode.
                 key == 'length' ||
                 // Node.js 0.10 has enumerable non-index properties on buffers.
                 (isBuff && (key == 'offset' || key == 'parent')) ||
                 // PhantomJS 2 has enumerable non-index properties on typed arrays.
                 (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
                 // Skip index properties.
                 isIndex(key, length)
              ))) {
            result.push(key);
          }
        }
        return result;
      }
  
      /**
       * A specialized version of `_.sample` for arrays.
       *
       * @private
       * @param {Array} array The array to sample.
       * @returns {*} Returns the random element.
       */
      function arraySample(array) {
        var length = array.length;
        return length ? array[baseRandom(0, length - 1)] : undefined;
      }
  
      /**
       * A specialized version of `_.sampleSize` for arrays.
       *
       * @private
       * @param {Array} array The array to sample.
       * @param {number} n The number of elements to sample.
       * @returns {Array} Returns the random elements.
       */
      function arraySampleSize(array, n) {
        return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length));
      }
  
      /**
       * A specialized version of `_.shuffle` for arrays.
       *
       * @private
       * @param {Array} array The array to shuffle.
       * @returns {Array} Returns the new shuffled array.
       */
      function arrayShuffle(array) {
        return shuffleSelf(copyArray(array));
      }
  
      /**
       * This function is like `assignValue` except that it doesn't assign
       * `undefined` values.
       *
       * @private
       * @param {Object} object The object to modify.
       * @param {string} key The key of the property to assign.
       * @param {*} value The value to assign.
       */
      function assignMergeValue(object, key, value) {
        if ((value !== undefined && !eq(object[key], value)) ||
            (value === undefined && !(key in object))) {
          baseAssignValue(object, key, value);
        }
      }
  
      /**
       * Assigns `value` to `key` of `object` if the existing value is not equivalent
       * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons.
       *
       * @private
       * @param {Object} object The object to modify.
       * @param {string} key The key of the property to assign.
       * @param {*} value The value to assign.
       */
      function assignValue(object, key, value) {
        var objValue = object[key];
        if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
            (value === undefined && !(key in object))) {
          baseAssignValue(object, key, value);
        }
      }
  
      /**
       * Gets the index at which the `key` is found in `array` of key-value pairs.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {*} key The key to search for.
       * @returns {number} Returns the index of the matched value, else `-1`.
       */
      function assocIndexOf(array, key) {
        var length = array.length;
        while (length--) {
          if (eq(array[length][0], key)) {
            return length;
          }
        }
        return -1;
      }
  
      /**
       * Aggregates elements of `collection` on `accumulator` with keys transformed
       * by `iteratee` and values set by `setter`.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} setter The function to set `accumulator` values.
       * @param {Function} iteratee The iteratee to transform keys.
       * @param {Object} accumulator The initial aggregated object.
       * @returns {Function} Returns `accumulator`.
       */
      function baseAggregator(collection, setter, iteratee, accumulator) {
        baseEach(collection, function(value, key, collection) {
          setter(accumulator, value, iteratee(value), collection);
        });
        return accumulator;
      }
  
      /**
       * The base implementation of `_.assign` without support for multiple sources
       * or `customizer` functions.
       *
       * @private
       * @param {Object} object The destination object.
       * @param {Object} source The source object.
       * @returns {Object} Returns `object`.
       */
      function baseAssign(object, source) {
        return object && copyObject(source, keys(source), object);
      }
  
      /**
       * The base implementation of `_.assignIn` without support for multiple sources
       * or `customizer` functions.
       *
       * @private
       * @param {Object} object The destination object.
       * @param {Object} source The source object.
       * @returns {Object} Returns `object`.
       */
      function baseAssignIn(object, source) {
        return object && copyObject(source, keysIn(source), object);
      }
  
      /**
       * The base implementation of `assignValue` and `assignMergeValue` without
       * value checks.
       *
       * @private
       * @param {Object} object The object to modify.
       * @param {string} key The key of the property to assign.
       * @param {*} value The value to assign.
       */
      function baseAssignValue(object, key, value) {
        if (key == '__proto__' && defineProperty) {
          defineProperty(object, key, {
            'configurable': true,
            'enumerable': true,
            'value': value,
            'writable': true
          });
        } else {
          object[key] = value;
        }
      }
  
      /**
       * The base implementation of `_.at` without support for individual paths.
       *
       * @private
       * @param {Object} object The object to iterate over.
       * @param {string[]} paths The property paths to pick.
       * @returns {Array} Returns the picked elements.
       */
      function baseAt(object, paths) {
        var index = -1,
            length = paths.length,
            result = Array(length),
            skip = object == null;
  
        while (++index < length) {
          result[index] = skip ? undefined : get(object, paths[index]);
        }
        return result;
      }
  
      /**
       * The base implementation of `_.clamp` which doesn't coerce arguments.
       *
       * @private
       * @param {number} number The number to clamp.
       * @param {number} [lower] The lower bound.
       * @param {number} upper The upper bound.
       * @returns {number} Returns the clamped number.
       */
      function baseClamp(number, lower, upper) {
        if (number === number) {
          if (upper !== undefined) {
            number = number <= upper ? number : upper;
          }
          if (lower !== undefined) {
            number = number >= lower ? number : lower;
          }
        }
        return number;
      }
  
      /**
       * The base implementation of `_.clone` and `_.cloneDeep` which tracks
       * traversed objects.
       *
       * @private
       * @param {*} value The value to clone.
       * @param {boolean} bitmask The bitmask flags.
       *  1 - Deep clone
       *  2 - Flatten inherited properties
       *  4 - Clone symbols
       * @param {Function} [customizer] The function to customize cloning.
       * @param {string} [key] The key of `value`.
       * @param {Object} [object] The parent object of `value`.
       * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
       * @returns {*} Returns the cloned value.
       */
      function baseClone(value, bitmask, customizer, key, object, stack) {
        var result,
            isDeep = bitmask & CLONE_DEEP_FLAG,
            isFlat = bitmask & CLONE_FLAT_FLAG,
            isFull = bitmask & CLONE_SYMBOLS_FLAG;
  
        if (customizer) {
          result = object ? customizer(value, key, object, stack) : customizer(value);
        }
        if (result !== undefined) {
          return result;
        }
        if (!isObject(value)) {
          return value;
        }
        var isArr = isArray(value);
        if (isArr) {
          result = initCloneArray(value);
          if (!isDeep) {
            return copyArray(value, result);
          }
        } else {
          var tag = getTag(value),
              isFunc = tag == funcTag || tag == genTag;
  
          if (isBuffer(value)) {
            return cloneBuffer(value, isDeep);
          }
          if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
            result = (isFlat || isFunc) ? {} : initCloneObject(value);
            if (!isDeep) {
              return isFlat
                ? copySymbolsIn(value, baseAssignIn(result, value))
                : copySymbols(value, baseAssign(result, value));
            }
          } else {
            if (!cloneableTags[tag]) {
              return object ? value : {};
            }
            result = initCloneByTag(value, tag, baseClone, isDeep);
          }
        }
        // Check for circular references and return its corresponding clone.
        stack || (stack = new Stack);
        var stacked = stack.get(value);
        if (stacked) {
          return stacked;
        }
        stack.set(value, result);
  
        var keysFunc = isFull
          ? (isFlat ? getAllKeysIn : getAllKeys)
          : (isFlat ? keysIn : keys);
  
        var props = isArr ? undefined : keysFunc(value);
        arrayEach(props || value, function(subValue, key) {
          if (props) {
            key = subValue;
            subValue = value[key];
          }
          // Recursively populate clone (susceptible to call stack limits).
          assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
        });
        return result;
      }
  
      /**
       * The base implementation of `_.conforms` which doesn't clone `source`.
       *
       * @private
       * @param {Object} source The object of property predicates to conform to.
       * @returns {Function} Returns the new spec function.
       */
      function baseConforms(source) {
        var props = keys(source);
        return function(object) {
          return baseConformsTo(object, source, props);
        };
      }
  
      /**
       * The base implementation of `_.conformsTo` which accepts `props` to check.
       *
       * @private
       * @param {Object} object The object to inspect.
       * @param {Object} source The object of property predicates to conform to.
       * @returns {boolean} Returns `true` if `object` conforms, else `false`.
       */
      function baseConformsTo(object, source, props) {
        var length = props.length;
        if (object == null) {
          return !length;
        }
        object = Object(object);
        while (length--) {
          var key = props[length],
              predicate = source[key],
              value = object[key];
  
          if ((value === undefined && !(key in object)) || !predicate(value)) {
            return false;
          }
        }
        return true;
      }
  
      /**
       * The base implementation of `_.delay` and `_.defer` which accepts `args`
       * to provide to `func`.
       *
       * @private
       * @param {Function} func The function to delay.
       * @param {number} wait The number of milliseconds to delay invocation.
       * @param {Array} args The arguments to provide to `func`.
       * @returns {number|Object} Returns the timer id or timeout object.
       */
      function baseDelay(func, wait, args) {
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        return setTimeout(function() { func.apply(undefined, args); }, wait);
      }
  
      /**
       * The base implementation of methods like `_.difference` without support
       * for excluding multiple arrays or iteratee shorthands.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {Array} values The values to exclude.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of filtered values.
       */
      function baseDifference(array, values, iteratee, comparator) {
        var index = -1,
            includes = arrayIncludes,
            isCommon = true,
            length = array.length,
            result = [],
            valuesLength = values.length;
  
        if (!length) {
          return result;
        }
        if (iteratee) {
          values = arrayMap(values, baseUnary(iteratee));
        }
        if (comparator) {
          includes = arrayIncludesWith;
          isCommon = false;
        }
        else if (values.length >= LARGE_ARRAY_SIZE) {
          includes = cacheHas;
          isCommon = false;
          values = new SetCache(values);
        }
        outer:
        while (++index < length) {
          var value = array[index],
              computed = iteratee == null ? value : iteratee(value);
  
          value = (comparator || value !== 0) ? value : 0;
          if (isCommon && computed === computed) {
            var valuesIndex = valuesLength;
            while (valuesIndex--) {
              if (values[valuesIndex] === computed) {
                continue outer;
              }
            }
            result.push(value);
          }
          else if (!includes(values, computed, comparator)) {
            result.push(value);
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.forEach` without support for iteratee shorthands.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Array|Object} Returns `collection`.
       */
      var baseEach = createBaseEach(baseForOwn);
  
      /**
       * The base implementation of `_.forEachRight` without support for iteratee shorthands.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Array|Object} Returns `collection`.
       */
      var baseEachRight = createBaseEach(baseForOwnRight, true);
  
      /**
       * The base implementation of `_.every` without support for iteratee shorthands.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} predicate The function invoked per iteration.
       * @returns {boolean} Returns `true` if all elements pass the predicate check,
       *  else `false`
       */
      function baseEvery(collection, predicate) {
        var result = true;
        baseEach(collection, function(value, index, collection) {
          result = !!predicate(value, index, collection);
          return result;
        });
        return result;
      }
  
      /**
       * The base implementation of methods like `_.max` and `_.min` which accepts a
       * `comparator` to determine the extremum value.
       *
       * @private
       * @param {Array} array The array to iterate over.
       * @param {Function} iteratee The iteratee invoked per iteration.
       * @param {Function} comparator The comparator used to compare values.
       * @returns {*} Returns the extremum value.
       */
      function baseExtremum(array, iteratee, comparator) {
        var index = -1,
            length = array.length;
  
        while (++index < length) {
          var value = array[index],
              current = iteratee(value);
  
          if (current != null && (computed === undefined
                ? (current === current && !isSymbol(current))
                : comparator(current, computed)
              )) {
            var computed = current,
                result = value;
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.fill` without an iteratee call guard.
       *
       * @private
       * @param {Array} array The array to fill.
       * @param {*} value The value to fill `array` with.
       * @param {number} [start=0] The start position.
       * @param {number} [end=array.length] The end position.
       * @returns {Array} Returns `array`.
       */
      function baseFill(array, value, start, end) {
        var length = array.length;
  
        start = toInteger(start);
        if (start < 0) {
          start = -start > length ? 0 : (length + start);
        }
        end = (end === undefined || end > length) ? length : toInteger(end);
        if (end < 0) {
          end += length;
        }
        end = start > end ? 0 : toLength(end);
        while (start < end) {
          array[start++] = value;
        }
        return array;
      }
  
      /**
       * The base implementation of `_.filter` without support for iteratee shorthands.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} predicate The function invoked per iteration.
       * @returns {Array} Returns the new filtered array.
       */
      function baseFilter(collection, predicate) {
        var result = [];
        baseEach(collection, function(value, index, collection) {
          if (predicate(value, index, collection)) {
            result.push(value);
          }
        });
        return result;
      }
  
      /**
       * The base implementation of `_.flatten` with support for restricting flattening.
       *
       * @private
       * @param {Array} array The array to flatten.
       * @param {number} depth The maximum recursion depth.
       * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
       * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
       * @param {Array} [result=[]] The initial result value.
       * @returns {Array} Returns the new flattened array.
       */
      function baseFlatten(array, depth, predicate, isStrict, result) {
        var index = -1,
            length = array.length;
  
        predicate || (predicate = isFlattenable);
        result || (result = []);
  
        while (++index < length) {
          var value = array[index];
          if (depth > 0 && predicate(value)) {
            if (depth > 1) {
              // Recursively flatten arrays (susceptible to call stack limits).
              baseFlatten(value, depth - 1, predicate, isStrict, result);
            } else {
              arrayPush(result, value);
            }
          } else if (!isStrict) {
            result[result.length] = value;
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `baseForOwn` which iterates over `object`
       * properties returned by `keysFunc` and invokes `iteratee` for each property.
       * Iteratee functions may exit iteration early by explicitly returning `false`.
       *
       * @private
       * @param {Object} object The object to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @param {Function} keysFunc The function to get the keys of `object`.
       * @returns {Object} Returns `object`.
       */
      var baseFor = createBaseFor();
  
      /**
       * This function is like `baseFor` except that it iterates over properties
       * in the opposite order.
       *
       * @private
       * @param {Object} object The object to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @param {Function} keysFunc The function to get the keys of `object`.
       * @returns {Object} Returns `object`.
       */
      var baseForRight = createBaseFor(true);
  
      /**
       * The base implementation of `_.forOwn` without support for iteratee shorthands.
       *
       * @private
       * @param {Object} object The object to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Object} Returns `object`.
       */
      function baseForOwn(object, iteratee) {
        return object && baseFor(object, iteratee, keys);
      }
  
      /**
       * The base implementation of `_.forOwnRight` without support for iteratee shorthands.
       *
       * @private
       * @param {Object} object The object to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Object} Returns `object`.
       */
      function baseForOwnRight(object, iteratee) {
        return object && baseForRight(object, iteratee, keys);
      }
  
      /**
       * The base implementation of `_.functions` which creates an array of
       * `object` function property names filtered from `props`.
       *
       * @private
       * @param {Object} object The object to inspect.
       * @param {Array} props The property names to filter.
       * @returns {Array} Returns the function names.
       */
      function baseFunctions(object, props) {
        return arrayFilter(props, function(key) {
          return isFunction(object[key]);
        });
      }
  
      /**
       * The base implementation of `_.get` without support for default values.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {Array|string} path The path of the property to get.
       * @returns {*} Returns the resolved value.
       */
      function baseGet(object, path) {
        path = castPath(path, object);
  
        var index = 0,
            length = path.length;
  
        while (object != null && index < length) {
          object = object[toKey(path[index++])];
        }
        return (index && index == length) ? object : undefined;
      }
  
      /**
       * The base implementation of `getAllKeys` and `getAllKeysIn` which uses
       * `keysFunc` and `symbolsFunc` to get the enumerable property names and
       * symbols of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {Function} keysFunc The function to get the keys of `object`.
       * @param {Function} symbolsFunc The function to get the symbols of `object`.
       * @returns {Array} Returns the array of property names and symbols.
       */
      function baseGetAllKeys(object, keysFunc, symbolsFunc) {
        var result = keysFunc(object);
        return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
      }
  
      /**
       * The base implementation of `getTag` without fallbacks for buggy environments.
       *
       * @private
       * @param {*} value The value to query.
       * @returns {string} Returns the `toStringTag`.
       */
      function baseGetTag(value) {
        if (value == null) {
          return value === undefined ? undefinedTag : nullTag;
        }
        return (symToStringTag && symToStringTag in Object(value))
          ? getRawTag(value)
          : objectToString(value);
      }
  
      /**
       * The base implementation of `_.gt` which doesn't coerce arguments.
       *
       * @private
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if `value` is greater than `other`,
       *  else `false`.
       */
      function baseGt(value, other) {
        return value > other;
      }
  
      /**
       * The base implementation of `_.has` without support for deep paths.
       *
       * @private
       * @param {Object} [object] The object to query.
       * @param {Array|string} key The key to check.
       * @returns {boolean} Returns `true` if `key` exists, else `false`.
       */
      function baseHas(object, key) {
        return object != null && hasOwnProperty.call(object, key);
      }
  
      /**
       * The base implementation of `_.hasIn` without support for deep paths.
       *
       * @private
       * @param {Object} [object] The object to query.
       * @param {Array|string} key The key to check.
       * @returns {boolean} Returns `true` if `key` exists, else `false`.
       */
      function baseHasIn(object, key) {
        return object != null && key in Object(object);
      }
  
      /**
       * The base implementation of `_.inRange` which doesn't coerce arguments.
       *
       * @private
       * @param {number} number The number to check.
       * @param {number} start The start of the range.
       * @param {number} end The end of the range.
       * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
       */
      function baseInRange(number, start, end) {
        return number >= nativeMin(start, end) && number < nativeMax(start, end);
      }
  
      /**
       * The base implementation of methods like `_.intersection`, without support
       * for iteratee shorthands, that accepts an array of arrays to inspect.
       *
       * @private
       * @param {Array} arrays The arrays to inspect.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of shared values.
       */
      function baseIntersection(arrays, iteratee, comparator) {
        var includes = comparator ? arrayIncludesWith : arrayIncludes,
            length = arrays[0].length,
            othLength = arrays.length,
            othIndex = othLength,
            caches = Array(othLength),
            maxLength = Infinity,
            result = [];
  
        while (othIndex--) {
          var array = arrays[othIndex];
          if (othIndex && iteratee) {
            array = arrayMap(array, baseUnary(iteratee));
          }
          maxLength = nativeMin(array.length, maxLength);
          caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))
            ? new SetCache(othIndex && array)
            : undefined;
        }
        array = arrays[0];
  
        var index = -1,
            seen = caches[0];
  
        outer:
        while (++index < length && result.length < maxLength) {
          var value = array[index],
              computed = iteratee ? iteratee(value) : value;
  
          value = (comparator || value !== 0) ? value : 0;
          if (!(seen
                ? cacheHas(seen, computed)
                : includes(result, computed, comparator)
              )) {
            othIndex = othLength;
            while (--othIndex) {
              var cache = caches[othIndex];
              if (!(cache
                    ? cacheHas(cache, computed)
                    : includes(arrays[othIndex], computed, comparator))
                  ) {
                continue outer;
              }
            }
            if (seen) {
              seen.push(computed);
            }
            result.push(value);
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.invert` and `_.invertBy` which inverts
       * `object` with values transformed by `iteratee` and set by `setter`.
       *
       * @private
       * @param {Object} object The object to iterate over.
       * @param {Function} setter The function to set `accumulator` values.
       * @param {Function} iteratee The iteratee to transform values.
       * @param {Object} accumulator The initial inverted object.
       * @returns {Function} Returns `accumulator`.
       */
      function baseInverter(object, setter, iteratee, accumulator) {
        baseForOwn(object, function(value, key, object) {
          setter(accumulator, iteratee(value), key, object);
        });
        return accumulator;
      }
  
      /**
       * The base implementation of `_.invoke` without support for individual
       * method arguments.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {Array|string} path The path of the method to invoke.
       * @param {Array} args The arguments to invoke the method with.
       * @returns {*} Returns the result of the invoked method.
       */
      function baseInvoke(object, path, args) {
        path = castPath(path, object);
        object = parent(object, path);
        var func = object == null ? object : object[toKey(last(path))];
        return func == null ? undefined : apply(func, object, args);
      }
  
      /**
       * The base implementation of `_.isArguments`.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an `arguments` object,
       */
      function baseIsArguments(value) {
        return isObjectLike(value) && baseGetTag(value) == argsTag;
      }
  
      /**
       * The base implementation of `_.isArrayBuffer` without Node.js optimizations.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
       */
      function baseIsArrayBuffer(value) {
        return isObjectLike(value) && baseGetTag(value) == arrayBufferTag;
      }
  
      /**
       * The base implementation of `_.isDate` without Node.js optimizations.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
       */
      function baseIsDate(value) {
        return isObjectLike(value) && baseGetTag(value) == dateTag;
      }
  
      /**
       * The base implementation of `_.isEqual` which supports partial comparisons
       * and tracks traversed objects.
       *
       * @private
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @param {boolean} bitmask The bitmask flags.
       *  1 - Unordered comparison
       *  2 - Partial comparison
       * @param {Function} [customizer] The function to customize comparisons.
       * @param {Object} [stack] Tracks traversed `value` and `other` objects.
       * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
       */
      function baseIsEqual(value, other, bitmask, customizer, stack) {
        if (value === other) {
          return true;
        }
        if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
          return value !== value && other !== other;
        }
        return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);
      }
  
      /**
       * A specialized version of `baseIsEqual` for arrays and objects which performs
       * deep comparisons and tracks traversed objects enabling objects with circular
       * references to be compared.
       *
       * @private
       * @param {Object} object The object to compare.
       * @param {Object} other The other object to compare.
       * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
       * @param {Function} customizer The function to customize comparisons.
       * @param {Function} equalFunc The function to determine equivalents of values.
       * @param {Object} [stack] Tracks traversed `object` and `other` objects.
       * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
       */
      function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {
        var objIsArr = isArray(object),
            othIsArr = isArray(other),
            objTag = objIsArr ? arrayTag : getTag(object),
            othTag = othIsArr ? arrayTag : getTag(other);
  
        objTag = objTag == argsTag ? objectTag : objTag;
        othTag = othTag == argsTag ? objectTag : othTag;
  
        var objIsObj = objTag == objectTag,
            othIsObj = othTag == objectTag,
            isSameTag = objTag == othTag;
  
        if (isSameTag && isBuffer(object)) {
          if (!isBuffer(other)) {
            return false;
          }
          objIsArr = true;
          objIsObj = false;
        }
        if (isSameTag && !objIsObj) {
          stack || (stack = new Stack);
          return (objIsArr || isTypedArray(object))
            ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)
            : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);
        }
        if (!(bitmask & COMPARE_PARTIAL_FLAG)) {
          var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
              othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');
  
          if (objIsWrapped || othIsWrapped) {
            var objUnwrapped = objIsWrapped ? object.value() : object,
                othUnwrapped = othIsWrapped ? other.value() : other;
  
            stack || (stack = new Stack);
            return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);
          }
        }
        if (!isSameTag) {
          return false;
        }
        stack || (stack = new Stack);
        return equalObjects(object, other, bitmask, customizer, equalFunc, stack);
      }
  
      /**
       * The base implementation of `_.isMap` without Node.js optimizations.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a map, else `false`.
       */
      function baseIsMap(value) {
        return isObjectLike(value) && getTag(value) == mapTag;
      }
  
      /**
       * The base implementation of `_.isMatch` without support for iteratee shorthands.
       *
       * @private
       * @param {Object} object The object to inspect.
       * @param {Object} source The object of property values to match.
       * @param {Array} matchData The property names, values, and compare flags to match.
       * @param {Function} [customizer] The function to customize comparisons.
       * @returns {boolean} Returns `true` if `object` is a match, else `false`.
       */
      function baseIsMatch(object, source, matchData, customizer) {
        var index = matchData.length,
            length = index,
            noCustomizer = !customizer;
  
        if (object == null) {
          return !length;
        }
        object = Object(object);
        while (index--) {
          var data = matchData[index];
          if ((noCustomizer && data[2])
                ? data[1] !== object[data[0]]
                : !(data[0] in object)
              ) {
            return false;
          }
        }
        while (++index < length) {
          data = matchData[index];
          var key = data[0],
              objValue = object[key],
              srcValue = data[1];
  
          if (noCustomizer && data[2]) {
            if (objValue === undefined && !(key in object)) {
              return false;
            }
          } else {
            var stack = new Stack;
            if (customizer) {
              var result = customizer(objValue, srcValue, key, object, source, stack);
            }
            if (!(result === undefined
                  ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack)
                  : result
                )) {
              return false;
            }
          }
        }
        return true;
      }
  
      /**
       * The base implementation of `_.isNative` without bad shim checks.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a native function,
       *  else `false`.
       */
      function baseIsNative(value) {
        if (!isObject(value) || isMasked(value)) {
          return false;
        }
        var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
        return pattern.test(toSource(value));
      }
  
      /**
       * The base implementation of `_.isRegExp` without Node.js optimizations.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
       */
      function baseIsRegExp(value) {
        return isObjectLike(value) && baseGetTag(value) == regexpTag;
      }
  
      /**
       * The base implementation of `_.isSet` without Node.js optimizations.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a set, else `false`.
       */
      function baseIsSet(value) {
        return isObjectLike(value) && getTag(value) == setTag;
      }
  
      /**
       * The base implementation of `_.isTypedArray` without Node.js optimizations.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
       */
      function baseIsTypedArray(value) {
        return isObjectLike(value) &&
          isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
      }
  
      /**
       * The base implementation of `_.iteratee`.
       *
       * @private
       * @param {*} [value=_.identity] The value to convert to an iteratee.
       * @returns {Function} Returns the iteratee.
       */
      function baseIteratee(value) {
        // Don't store the `typeof` result in a variable to avoid a JIT bug in Safari 9.
        // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details.
        if (typeof value == 'function') {
          return value;
        }
        if (value == null) {
          return identity;
        }
        if (typeof value == 'object') {
          return isArray(value)
            ? baseMatchesProperty(value[0], value[1])
            : baseMatches(value);
        }
        return property(value);
      }
  
      /**
       * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names.
       */
      function baseKeys(object) {
        if (!isPrototype(object)) {
          return nativeKeys(object);
        }
        var result = [];
        for (var key in Object(object)) {
          if (hasOwnProperty.call(object, key) && key != 'constructor') {
            result.push(key);
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names.
       */
      function baseKeysIn(object) {
        if (!isObject(object)) {
          return nativeKeysIn(object);
        }
        var isProto = isPrototype(object),
            result = [];
  
        for (var key in object) {
          if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
            result.push(key);
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.lt` which doesn't coerce arguments.
       *
       * @private
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if `value` is less than `other`,
       *  else `false`.
       */
      function baseLt(value, other) {
        return value < other;
      }
  
      /**
       * The base implementation of `_.map` without support for iteratee shorthands.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Array} Returns the new mapped array.
       */
      function baseMap(collection, iteratee) {
        var index = -1,
            result = isArrayLike(collection) ? Array(collection.length) : [];
  
        baseEach(collection, function(value, key, collection) {
          result[++index] = iteratee(value, key, collection);
        });
        return result;
      }
  
      /**
       * The base implementation of `_.matches` which doesn't clone `source`.
       *
       * @private
       * @param {Object} source The object of property values to match.
       * @returns {Function} Returns the new spec function.
       */
      function baseMatches(source) {
        var matchData = getMatchData(source);
        if (matchData.length == 1 && matchData[0][2]) {
          return matchesStrictComparable(matchData[0][0], matchData[0][1]);
        }
        return function(object) {
          return object === source || baseIsMatch(object, source, matchData);
        };
      }
  
      /**
       * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`.
       *
       * @private
       * @param {string} path The path of the property to get.
       * @param {*} srcValue The value to match.
       * @returns {Function} Returns the new spec function.
       */
      function baseMatchesProperty(path, srcValue) {
        if (isKey(path) && isStrictComparable(srcValue)) {
          return matchesStrictComparable(toKey(path), srcValue);
        }
        return function(object) {
          var objValue = get(object, path);
          return (objValue === undefined && objValue === srcValue)
            ? hasIn(object, path)
            : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG);
        };
      }
  
      /**
       * The base implementation of `_.merge` without support for multiple sources.
       *
       * @private
       * @param {Object} object The destination object.
       * @param {Object} source The source object.
       * @param {number} srcIndex The index of `source`.
       * @param {Function} [customizer] The function to customize merged values.
       * @param {Object} [stack] Tracks traversed source values and their merged
       *  counterparts.
       */
      function baseMerge(object, source, srcIndex, customizer, stack) {
        if (object === source) {
          return;
        }
        baseFor(source, function(srcValue, key) {
          if (isObject(srcValue)) {
            stack || (stack = new Stack);
            baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
          }
          else {
            var newValue = customizer
              ? customizer(object[key], srcValue, (key + ''), object, source, stack)
              : undefined;
  
            if (newValue === undefined) {
              newValue = srcValue;
            }
            assignMergeValue(object, key, newValue);
          }
        }, keysIn);
      }
  
      /**
       * A specialized version of `baseMerge` for arrays and objects which performs
       * deep merges and tracks traversed objects enabling objects with circular
       * references to be merged.
       *
       * @private
       * @param {Object} object The destination object.
       * @param {Object} source The source object.
       * @param {string} key The key of the value to merge.
       * @param {number} srcIndex The index of `source`.
       * @param {Function} mergeFunc The function to merge values.
       * @param {Function} [customizer] The function to customize assigned values.
       * @param {Object} [stack] Tracks traversed source values and their merged
       *  counterparts.
       */
      function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
        var objValue = object[key],
            srcValue = source[key],
            stacked = stack.get(srcValue);
  
        if (stacked) {
          assignMergeValue(object, key, stacked);
          return;
        }
        var newValue = customizer
          ? customizer(objValue, srcValue, (key + ''), object, source, stack)
          : undefined;
  
        var isCommon = newValue === undefined;
  
        if (isCommon) {
          var isArr = isArray(srcValue),
              isBuff = !isArr && isBuffer(srcValue),
              isTyped = !isArr && !isBuff && isTypedArray(srcValue);
  
          newValue = srcValue;
          if (isArr || isBuff || isTyped) {
            if (isArray(objValue)) {
              newValue = objValue;
            }
            else if (isArrayLikeObject(objValue)) {
              newValue = copyArray(objValue);
            }
            else if (isBuff) {
              isCommon = false;
              newValue = cloneBuffer(srcValue, true);
            }
            else if (isTyped) {
              isCommon = false;
              newValue = cloneTypedArray(srcValue, true);
            }
            else {
              newValue = [];
            }
          }
          else if (isPlainObject(srcValue) || isArguments(srcValue)) {
            newValue = objValue;
            if (isArguments(objValue)) {
              newValue = toPlainObject(objValue);
            }
            else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) {
              newValue = initCloneObject(srcValue);
            }
          }
          else {
            isCommon = false;
          }
        }
        if (isCommon) {
          // Recursively merge objects and arrays (susceptible to call stack limits).
          stack.set(srcValue, newValue);
          mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
          stack['delete'](srcValue);
        }
        assignMergeValue(object, key, newValue);
      }
  
      /**
       * The base implementation of `_.nth` which doesn't coerce arguments.
       *
       * @private
       * @param {Array} array The array to query.
       * @param {number} n The index of the element to return.
       * @returns {*} Returns the nth element of `array`.
       */
      function baseNth(array, n) {
        var length = array.length;
        if (!length) {
          return;
        }
        n += n < 0 ? length : 0;
        return isIndex(n, length) ? array[n] : undefined;
      }
  
      /**
       * The base implementation of `_.orderBy` without param guards.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
       * @param {string[]} orders The sort orders of `iteratees`.
       * @returns {Array} Returns the new sorted array.
       */
      function baseOrderBy(collection, iteratees, orders) {
        var index = -1;
        iteratees = arrayMap(iteratees.length ? iteratees : [identity], baseUnary(getIteratee()));
  
        var result = baseMap(collection, function(value, key, collection) {
          var criteria = arrayMap(iteratees, function(iteratee) {
            return iteratee(value);
          });
          return { 'criteria': criteria, 'index': ++index, 'value': value };
        });
  
        return baseSortBy(result, function(object, other) {
          return compareMultiple(object, other, orders);
        });
      }
  
      /**
       * The base implementation of `_.pick` without support for individual
       * property identifiers.
       *
       * @private
       * @param {Object} object The source object.
       * @param {string[]} paths The property paths to pick.
       * @returns {Object} Returns the new object.
       */
      function basePick(object, paths) {
        return basePickBy(object, paths, function(value, path) {
          return hasIn(object, path);
        });
      }
  
      /**
       * The base implementation of  `_.pickBy` without support for iteratee shorthands.
       *
       * @private
       * @param {Object} object The source object.
       * @param {string[]} paths The property paths to pick.
       * @param {Function} predicate The function invoked per property.
       * @returns {Object} Returns the new object.
       */
      function basePickBy(object, paths, predicate) {
        var index = -1,
            length = paths.length,
            result = {};
  
        while (++index < length) {
          var path = paths[index],
              value = baseGet(object, path);
  
          if (predicate(value, path)) {
            baseSet(result, castPath(path, object), value);
          }
        }
        return result;
      }
  
      /**
       * A specialized version of `baseProperty` which supports deep paths.
       *
       * @private
       * @param {Array|string} path The path of the property to get.
       * @returns {Function} Returns the new accessor function.
       */
      function basePropertyDeep(path) {
        return function(object) {
          return baseGet(object, path);
        };
      }
  
      /**
       * The base implementation of `_.pullAllBy` without support for iteratee
       * shorthands.
       *
       * @private
       * @param {Array} array The array to modify.
       * @param {Array} values The values to remove.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns `array`.
       */
      function basePullAll(array, values, iteratee, comparator) {
        var indexOf = comparator ? baseIndexOfWith : baseIndexOf,
            index = -1,
            length = values.length,
            seen = array;
  
        if (array === values) {
          values = copyArray(values);
        }
        if (iteratee) {
          seen = arrayMap(array, baseUnary(iteratee));
        }
        while (++index < length) {
          var fromIndex = 0,
              value = values[index],
              computed = iteratee ? iteratee(value) : value;
  
          while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {
            if (seen !== array) {
              splice.call(seen, fromIndex, 1);
            }
            splice.call(array, fromIndex, 1);
          }
        }
        return array;
      }
  
      /**
       * The base implementation of `_.pullAt` without support for individual
       * indexes or capturing the removed elements.
       *
       * @private
       * @param {Array} array The array to modify.
       * @param {number[]} indexes The indexes of elements to remove.
       * @returns {Array} Returns `array`.
       */
      function basePullAt(array, indexes) {
        var length = array ? indexes.length : 0,
            lastIndex = length - 1;
  
        while (length--) {
          var index = indexes[length];
          if (length == lastIndex || index !== previous) {
            var previous = index;
            if (isIndex(index)) {
              splice.call(array, index, 1);
            } else {
              baseUnset(array, index);
            }
          }
        }
        return array;
      }
  
      /**
       * The base implementation of `_.random` without support for returning
       * floating-point numbers.
       *
       * @private
       * @param {number} lower The lower bound.
       * @param {number} upper The upper bound.
       * @returns {number} Returns the random number.
       */
      function baseRandom(lower, upper) {
        return lower + nativeFloor(nativeRandom() * (upper - lower + 1));
      }
  
      /**
       * The base implementation of `_.range` and `_.rangeRight` which doesn't
       * coerce arguments.
       *
       * @private
       * @param {number} start The start of the range.
       * @param {number} end The end of the range.
       * @param {number} step The value to increment or decrement by.
       * @param {boolean} [fromRight] Specify iterating from right to left.
       * @returns {Array} Returns the range of numbers.
       */
      function baseRange(start, end, step, fromRight) {
        var index = -1,
            length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
            result = Array(length);
  
        while (length--) {
          result[fromRight ? length : ++index] = start;
          start += step;
        }
        return result;
      }
  
      /**
       * The base implementation of `_.repeat` which doesn't coerce arguments.
       *
       * @private
       * @param {string} string The string to repeat.
       * @param {number} n The number of times to repeat the string.
       * @returns {string} Returns the repeated string.
       */
      function baseRepeat(string, n) {
        var result = '';
        if (!string || n < 1 || n > MAX_SAFE_INTEGER) {
          return result;
        }
        // Leverage the exponentiation by squaring algorithm for a faster repeat.
        // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
        do {
          if (n % 2) {
            result += string;
          }
          n = nativeFloor(n / 2);
          if (n) {
            string += string;
          }
        } while (n);
  
        return result;
      }
  
      /**
       * The base implementation of `_.rest` which doesn't validate or coerce arguments.
       *
       * @private
       * @param {Function} func The function to apply a rest parameter to.
       * @param {number} [start=func.length-1] The start position of the rest parameter.
       * @returns {Function} Returns the new function.
       */
      function baseRest(func, start) {
        return setToString(overRest(func, start, identity), func + '');
      }
  
      /**
       * The base implementation of `_.sample`.
       *
       * @private
       * @param {Array|Object} collection The collection to sample.
       * @returns {*} Returns the random element.
       */
      function baseSample(collection) {
        return arraySample(values(collection));
      }
  
      /**
       * The base implementation of `_.sampleSize` without param guards.
       *
       * @private
       * @param {Array|Object} collection The collection to sample.
       * @param {number} n The number of elements to sample.
       * @returns {Array} Returns the random elements.
       */
      function baseSampleSize(collection, n) {
        var array = values(collection);
        return shuffleSelf(array, baseClamp(n, 0, array.length));
      }
  
      /**
       * The base implementation of `_.set`.
       *
       * @private
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to set.
       * @param {*} value The value to set.
       * @param {Function} [customizer] The function to customize path creation.
       * @returns {Object} Returns `object`.
       */
      function baseSet(object, path, value, customizer) {
        if (!isObject(object)) {
          return object;
        }
        path = castPath(path, object);
  
        var index = -1,
            length = path.length,
            lastIndex = length - 1,
            nested = object;
  
        while (nested != null && ++index < length) {
          var key = toKey(path[index]),
              newValue = value;
  
          if (index != lastIndex) {
            var objValue = nested[key];
            newValue = customizer ? customizer(objValue, key, nested) : undefined;
            if (newValue === undefined) {
              newValue = isObject(objValue)
                ? objValue
                : (isIndex(path[index + 1]) ? [] : {});
            }
          }
          assignValue(nested, key, newValue);
          nested = nested[key];
        }
        return object;
      }
  
      /**
       * The base implementation of `setData` without support for hot loop shorting.
       *
       * @private
       * @param {Function} func The function to associate metadata with.
       * @param {*} data The metadata.
       * @returns {Function} Returns `func`.
       */
      var baseSetData = !metaMap ? identity : function(func, data) {
        metaMap.set(func, data);
        return func;
      };
  
      /**
       * The base implementation of `setToString` without support for hot loop shorting.
       *
       * @private
       * @param {Function} func The function to modify.
       * @param {Function} string The `toString` result.
       * @returns {Function} Returns `func`.
       */
      var baseSetToString = !defineProperty ? identity : function(func, string) {
        return defineProperty(func, 'toString', {
          'configurable': true,
          'enumerable': false,
          'value': constant(string),
          'writable': true
        });
      };
  
      /**
       * The base implementation of `_.shuffle`.
       *
       * @private
       * @param {Array|Object} collection The collection to shuffle.
       * @returns {Array} Returns the new shuffled array.
       */
      function baseShuffle(collection) {
        return shuffleSelf(values(collection));
      }
  
      /**
       * The base implementation of `_.slice` without an iteratee call guard.
       *
       * @private
       * @param {Array} array The array to slice.
       * @param {number} [start=0] The start position.
       * @param {number} [end=array.length] The end position.
       * @returns {Array} Returns the slice of `array`.
       */
      function baseSlice(array, start, end) {
        var index = -1,
            length = array.length;
  
        if (start < 0) {
          start = -start > length ? 0 : (length + start);
        }
        end = end > length ? length : end;
        if (end < 0) {
          end += length;
        }
        length = start > end ? 0 : ((end - start) >>> 0);
        start >>>= 0;
  
        var result = Array(length);
        while (++index < length) {
          result[index] = array[index + start];
        }
        return result;
      }
  
      /**
       * The base implementation of `_.some` without support for iteratee shorthands.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} predicate The function invoked per iteration.
       * @returns {boolean} Returns `true` if any element passes the predicate check,
       *  else `false`.
       */
      function baseSome(collection, predicate) {
        var result;
  
        baseEach(collection, function(value, index, collection) {
          result = predicate(value, index, collection);
          return !result;
        });
        return !!result;
      }
  
      /**
       * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which
       * performs a binary search of `array` to determine the index at which `value`
       * should be inserted into `array` in order to maintain its sort order.
       *
       * @private
       * @param {Array} array The sorted array to inspect.
       * @param {*} value The value to evaluate.
       * @param {boolean} [retHighest] Specify returning the highest qualified index.
       * @returns {number} Returns the index at which `value` should be inserted
       *  into `array`.
       */
      function baseSortedIndex(array, value, retHighest) {
        var low = 0,
            high = array == null ? low : array.length;
  
        if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
          while (low < high) {
            var mid = (low + high) >>> 1,
                computed = array[mid];
  
            if (computed !== null && !isSymbol(computed) &&
                (retHighest ? (computed <= value) : (computed < value))) {
              low = mid + 1;
            } else {
              high = mid;
            }
          }
          return high;
        }
        return baseSortedIndexBy(array, value, identity, retHighest);
      }
  
      /**
       * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy`
       * which invokes `iteratee` for `value` and each element of `array` to compute
       * their sort ranking. The iteratee is invoked with one argument; (value).
       *
       * @private
       * @param {Array} array The sorted array to inspect.
       * @param {*} value The value to evaluate.
       * @param {Function} iteratee The iteratee invoked per element.
       * @param {boolean} [retHighest] Specify returning the highest qualified index.
       * @returns {number} Returns the index at which `value` should be inserted
       *  into `array`.
       */
      function baseSortedIndexBy(array, value, iteratee, retHighest) {
        value = iteratee(value);
  
        var low = 0,
            high = array == null ? 0 : array.length,
            valIsNaN = value !== value,
            valIsNull = value === null,
            valIsSymbol = isSymbol(value),
            valIsUndefined = value === undefined;
  
        while (low < high) {
          var mid = nativeFloor((low + high) / 2),
              computed = iteratee(array[mid]),
              othIsDefined = computed !== undefined,
              othIsNull = computed === null,
              othIsReflexive = computed === computed,
              othIsSymbol = isSymbol(computed);
  
          if (valIsNaN) {
            var setLow = retHighest || othIsReflexive;
          } else if (valIsUndefined) {
            setLow = othIsReflexive && (retHighest || othIsDefined);
          } else if (valIsNull) {
            setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);
          } else if (valIsSymbol) {
            setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);
          } else if (othIsNull || othIsSymbol) {
            setLow = false;
          } else {
            setLow = retHighest ? (computed <= value) : (computed < value);
          }
          if (setLow) {
            low = mid + 1;
          } else {
            high = mid;
          }
        }
        return nativeMin(high, MAX_ARRAY_INDEX);
      }
  
      /**
       * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without
       * support for iteratee shorthands.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @returns {Array} Returns the new duplicate free array.
       */
      function baseSortedUniq(array, iteratee) {
        var index = -1,
            length = array.length,
            resIndex = 0,
            result = [];
  
        while (++index < length) {
          var value = array[index],
              computed = iteratee ? iteratee(value) : value;
  
          if (!index || !eq(computed, seen)) {
            var seen = computed;
            result[resIndex++] = value === 0 ? 0 : value;
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.toNumber` which doesn't ensure correct
       * conversions of binary, hexadecimal, or octal string values.
       *
       * @private
       * @param {*} value The value to process.
       * @returns {number} Returns the number.
       */
      function baseToNumber(value) {
        if (typeof value == 'number') {
          return value;
        }
        if (isSymbol(value)) {
          return NAN;
        }
        return +value;
      }
  
      /**
       * The base implementation of `_.toString` which doesn't convert nullish
       * values to empty strings.
       *
       * @private
       * @param {*} value The value to process.
       * @returns {string} Returns the string.
       */
      function baseToString(value) {
        // Exit early for strings to avoid a performance hit in some environments.
        if (typeof value == 'string') {
          return value;
        }
        if (isArray(value)) {
          // Recursively convert values (susceptible to call stack limits).
          return arrayMap(value, baseToString) + '';
        }
        if (isSymbol(value)) {
          return symbolToString ? symbolToString.call(value) : '';
        }
        var result = (value + '');
        return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
      }
  
      /**
       * The base implementation of `_.uniqBy` without support for iteratee shorthands.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new duplicate free array.
       */
      function baseUniq(array, iteratee, comparator) {
        var index = -1,
            includes = arrayIncludes,
            length = array.length,
            isCommon = true,
            result = [],
            seen = result;
  
        if (comparator) {
          isCommon = false;
          includes = arrayIncludesWith;
        }
        else if (length >= LARGE_ARRAY_SIZE) {
          var set = iteratee ? null : createSet(array);
          if (set) {
            return setToArray(set);
          }
          isCommon = false;
          includes = cacheHas;
          seen = new SetCache;
        }
        else {
          seen = iteratee ? [] : result;
        }
        outer:
        while (++index < length) {
          var value = array[index],
              computed = iteratee ? iteratee(value) : value;
  
          value = (comparator || value !== 0) ? value : 0;
          if (isCommon && computed === computed) {
            var seenIndex = seen.length;
            while (seenIndex--) {
              if (seen[seenIndex] === computed) {
                continue outer;
              }
            }
            if (iteratee) {
              seen.push(computed);
            }
            result.push(value);
          }
          else if (!includes(seen, computed, comparator)) {
            if (seen !== result) {
              seen.push(computed);
            }
            result.push(value);
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.unset`.
       *
       * @private
       * @param {Object} object The object to modify.
       * @param {Array|string} path The property path to unset.
       * @returns {boolean} Returns `true` if the property is deleted, else `false`.
       */
      function baseUnset(object, path) {
        path = castPath(path, object);
        object = parent(object, path);
        return object == null || delete object[toKey(last(path))];
      }
  
      /**
       * The base implementation of `_.update`.
       *
       * @private
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to update.
       * @param {Function} updater The function to produce the updated value.
       * @param {Function} [customizer] The function to customize path creation.
       * @returns {Object} Returns `object`.
       */
      function baseUpdate(object, path, updater, customizer) {
        return baseSet(object, path, updater(baseGet(object, path)), customizer);
      }
  
      /**
       * The base implementation of methods like `_.dropWhile` and `_.takeWhile`
       * without support for iteratee shorthands.
       *
       * @private
       * @param {Array} array The array to query.
       * @param {Function} predicate The function invoked per iteration.
       * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
       * @param {boolean} [fromRight] Specify iterating from right to left.
       * @returns {Array} Returns the slice of `array`.
       */
      function baseWhile(array, predicate, isDrop, fromRight) {
        var length = array.length,
            index = fromRight ? length : -1;
  
        while ((fromRight ? index-- : ++index < length) &&
          predicate(array[index], index, array)) {}
  
        return isDrop
          ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
          : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
      }
  
      /**
       * The base implementation of `wrapperValue` which returns the result of
       * performing a sequence of actions on the unwrapped `value`, where each
       * successive action is supplied the return value of the previous.
       *
       * @private
       * @param {*} value The unwrapped value.
       * @param {Array} actions Actions to perform to resolve the unwrapped value.
       * @returns {*} Returns the resolved value.
       */
      function baseWrapperValue(value, actions) {
        var result = value;
        if (result instanceof LazyWrapper) {
          result = result.value();
        }
        return arrayReduce(actions, function(result, action) {
          return action.func.apply(action.thisArg, arrayPush([result], action.args));
        }, result);
      }
  
      /**
       * The base implementation of methods like `_.xor`, without support for
       * iteratee shorthands, that accepts an array of arrays to inspect.
       *
       * @private
       * @param {Array} arrays The arrays to inspect.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of values.
       */
      function baseXor(arrays, iteratee, comparator) {
        var length = arrays.length;
        if (length < 2) {
          return length ? baseUniq(arrays[0]) : [];
        }
        var index = -1,
            result = Array(length);
  
        while (++index < length) {
          var array = arrays[index],
              othIndex = -1;
  
          while (++othIndex < length) {
            if (othIndex != index) {
              result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator);
            }
          }
        }
        return baseUniq(baseFlatten(result, 1), iteratee, comparator);
      }
  
      /**
       * This base implementation of `_.zipObject` which assigns values using `assignFunc`.
       *
       * @private
       * @param {Array} props The property identifiers.
       * @param {Array} values The property values.
       * @param {Function} assignFunc The function to assign values.
       * @returns {Object} Returns the new object.
       */
      function baseZipObject(props, values, assignFunc) {
        var index = -1,
            length = props.length,
            valsLength = values.length,
            result = {};
  
        while (++index < length) {
          var value = index < valsLength ? values[index] : undefined;
          assignFunc(result, props[index], value);
        }
        return result;
      }
  
      /**
       * Casts `value` to an empty array if it's not an array like object.
       *
       * @private
       * @param {*} value The value to inspect.
       * @returns {Array|Object} Returns the cast array-like object.
       */
      function castArrayLikeObject(value) {
        return isArrayLikeObject(value) ? value : [];
      }
  
      /**
       * Casts `value` to `identity` if it's not a function.
       *
       * @private
       * @param {*} value The value to inspect.
       * @returns {Function} Returns cast function.
       */
      function castFunction(value) {
        return typeof value == 'function' ? value : identity;
      }
  
      /**
       * Casts `value` to a path array if it's not one.
       *
       * @private
       * @param {*} value The value to inspect.
       * @param {Object} [object] The object to query keys on.
       * @returns {Array} Returns the cast property path array.
       */
      function castPath(value, object) {
        if (isArray(value)) {
          return value;
        }
        return isKey(value, object) ? [value] : stringToPath(toString(value));
      }
  
      /**
       * A `baseRest` alias which can be replaced with `identity` by module
       * replacement plugins.
       *
       * @private
       * @type {Function}
       * @param {Function} func The function to apply a rest parameter to.
       * @returns {Function} Returns the new function.
       */
      var castRest = baseRest;
  
      /**
       * Casts `array` to a slice if it's needed.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {number} start The start position.
       * @param {number} [end=array.length] The end position.
       * @returns {Array} Returns the cast slice.
       */
      function castSlice(array, start, end) {
        var length = array.length;
        end = end === undefined ? length : end;
        return (!start && end >= length) ? array : baseSlice(array, start, end);
      }
  
      /**
       * A simple wrapper around the global [`clearTimeout`](https://mdn.io/clearTimeout).
       *
       * @private
       * @param {number|Object} id The timer id or timeout object of the timer to clear.
       */
      var clearTimeout = ctxClearTimeout || function(id) {
        return root.clearTimeout(id);
      };
  
      /**
       * Creates a clone of  `buffer`.
       *
       * @private
       * @param {Buffer} buffer The buffer to clone.
       * @param {boolean} [isDeep] Specify a deep clone.
       * @returns {Buffer} Returns the cloned buffer.
       */
      function cloneBuffer(buffer, isDeep) {
        if (isDeep) {
          return buffer.slice();
        }
        var length = buffer.length,
            result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length);
  
        buffer.copy(result);
        return result;
      }
  
      /**
       * Creates a clone of `arrayBuffer`.
       *
       * @private
       * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
       * @returns {ArrayBuffer} Returns the cloned array buffer.
       */
      function cloneArrayBuffer(arrayBuffer) {
        var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
        new Uint8Array(result).set(new Uint8Array(arrayBuffer));
        return result;
      }
  
      /**
       * Creates a clone of `dataView`.
       *
       * @private
       * @param {Object} dataView The data view to clone.
       * @param {boolean} [isDeep] Specify a deep clone.
       * @returns {Object} Returns the cloned data view.
       */
      function cloneDataView(dataView, isDeep) {
        var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;
        return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);
      }
  
      /**
       * Creates a clone of `map`.
       *
       * @private
       * @param {Object} map The map to clone.
       * @param {Function} cloneFunc The function to clone values.
       * @param {boolean} [isDeep] Specify a deep clone.
       * @returns {Object} Returns the cloned map.
       */
      function cloneMap(map, isDeep, cloneFunc) {
        var array = isDeep ? cloneFunc(mapToArray(map), CLONE_DEEP_FLAG) : mapToArray(map);
        return arrayReduce(array, addMapEntry, new map.constructor);
      }
  
      /**
       * Creates a clone of `regexp`.
       *
       * @private
       * @param {Object} regexp The regexp to clone.
       * @returns {Object} Returns the cloned regexp.
       */
      function cloneRegExp(regexp) {
        var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
        result.lastIndex = regexp.lastIndex;
        return result;
      }
  
      /**
       * Creates a clone of `set`.
       *
       * @private
       * @param {Object} set The set to clone.
       * @param {Function} cloneFunc The function to clone values.
       * @param {boolean} [isDeep] Specify a deep clone.
       * @returns {Object} Returns the cloned set.
       */
      function cloneSet(set, isDeep, cloneFunc) {
        var array = isDeep ? cloneFunc(setToArray(set), CLONE_DEEP_FLAG) : setToArray(set);
        return arrayReduce(array, addSetEntry, new set.constructor);
      }
  
      /**
       * Creates a clone of the `symbol` object.
       *
       * @private
       * @param {Object} symbol The symbol object to clone.
       * @returns {Object} Returns the cloned symbol object.
       */
      function cloneSymbol(symbol) {
        return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
      }
  
      /**
       * Creates a clone of `typedArray`.
       *
       * @private
       * @param {Object} typedArray The typed array to clone.
       * @param {boolean} [isDeep] Specify a deep clone.
       * @returns {Object} Returns the cloned typed array.
       */
      function cloneTypedArray(typedArray, isDeep) {
        var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
        return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
      }
  
      /**
       * Compares values to sort them in ascending order.
       *
       * @private
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {number} Returns the sort order indicator for `value`.
       */
      function compareAscending(value, other) {
        if (value !== other) {
          var valIsDefined = value !== undefined,
              valIsNull = value === null,
              valIsReflexive = value === value,
              valIsSymbol = isSymbol(value);
  
          var othIsDefined = other !== undefined,
              othIsNull = other === null,
              othIsReflexive = other === other,
              othIsSymbol = isSymbol(other);
  
          if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) ||
              (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) ||
              (valIsNull && othIsDefined && othIsReflexive) ||
              (!valIsDefined && othIsReflexive) ||
              !valIsReflexive) {
            return 1;
          }
          if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) ||
              (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) ||
              (othIsNull && valIsDefined && valIsReflexive) ||
              (!othIsDefined && valIsReflexive) ||
              !othIsReflexive) {
            return -1;
          }
        }
        return 0;
      }
  
      /**
       * Used by `_.orderBy` to compare multiple properties of a value to another
       * and stable sort them.
       *
       * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
       * specify an order of "desc" for descending or "asc" for ascending sort order
       * of corresponding values.
       *
       * @private
       * @param {Object} object The object to compare.
       * @param {Object} other The other object to compare.
       * @param {boolean[]|string[]} orders The order to sort by for each property.
       * @returns {number} Returns the sort order indicator for `object`.
       */
      function compareMultiple(object, other, orders) {
        var index = -1,
            objCriteria = object.criteria,
            othCriteria = other.criteria,
            length = objCriteria.length,
            ordersLength = orders.length;
  
        while (++index < length) {
          var result = compareAscending(objCriteria[index], othCriteria[index]);
          if (result) {
            if (index >= ordersLength) {
              return result;
            }
            var order = orders[index];
            return result * (order == 'desc' ? -1 : 1);
          }
        }
        // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
        // that causes it, under certain circumstances, to provide the same value for
        // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
        // for more details.
        //
        // This also ensures a stable sort in V8 and other engines.
        // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
        return object.index - other.index;
      }
  
      /**
       * Creates an array that is the composition of partially applied arguments,
       * placeholders, and provided arguments into a single array of arguments.
       *
       * @private
       * @param {Array} args The provided arguments.
       * @param {Array} partials The arguments to prepend to those provided.
       * @param {Array} holders The `partials` placeholder indexes.
       * @params {boolean} [isCurried] Specify composing for a curried function.
       * @returns {Array} Returns the new array of composed arguments.
       */
      function composeArgs(args, partials, holders, isCurried) {
        var argsIndex = -1,
            argsLength = args.length,
            holdersLength = holders.length,
            leftIndex = -1,
            leftLength = partials.length,
            rangeLength = nativeMax(argsLength - holdersLength, 0),
            result = Array(leftLength + rangeLength),
            isUncurried = !isCurried;
  
        while (++leftIndex < leftLength) {
          result[leftIndex] = partials[leftIndex];
        }
        while (++argsIndex < holdersLength) {
          if (isUncurried || argsIndex < argsLength) {
            result[holders[argsIndex]] = args[argsIndex];
          }
        }
        while (rangeLength--) {
          result[leftIndex++] = args[argsIndex++];
        }
        return result;
      }
  
      /**
       * This function is like `composeArgs` except that the arguments composition
       * is tailored for `_.partialRight`.
       *
       * @private
       * @param {Array} args The provided arguments.
       * @param {Array} partials The arguments to append to those provided.
       * @param {Array} holders The `partials` placeholder indexes.
       * @params {boolean} [isCurried] Specify composing for a curried function.
       * @returns {Array} Returns the new array of composed arguments.
       */
      function composeArgsRight(args, partials, holders, isCurried) {
        var argsIndex = -1,
            argsLength = args.length,
            holdersIndex = -1,
            holdersLength = holders.length,
            rightIndex = -1,
            rightLength = partials.length,
            rangeLength = nativeMax(argsLength - holdersLength, 0),
            result = Array(rangeLength + rightLength),
            isUncurried = !isCurried;
  
        while (++argsIndex < rangeLength) {
          result[argsIndex] = args[argsIndex];
        }
        var offset = argsIndex;
        while (++rightIndex < rightLength) {
          result[offset + rightIndex] = partials[rightIndex];
        }
        while (++holdersIndex < holdersLength) {
          if (isUncurried || argsIndex < argsLength) {
            result[offset + holders[holdersIndex]] = args[argsIndex++];
          }
        }
        return result;
      }
  
      /**
       * Copies the values of `source` to `array`.
       *
       * @private
       * @param {Array} source The array to copy values from.
       * @param {Array} [array=[]] The array to copy values to.
       * @returns {Array} Returns `array`.
       */
      function copyArray(source, array) {
        var index = -1,
            length = source.length;
  
        array || (array = Array(length));
        while (++index < length) {
          array[index] = source[index];
        }
        return array;
      }
  
      /**
       * Copies properties of `source` to `object`.
       *
       * @private
       * @param {Object} source The object to copy properties from.
       * @param {Array} props The property identifiers to copy.
       * @param {Object} [object={}] The object to copy properties to.
       * @param {Function} [customizer] The function to customize copied values.
       * @returns {Object} Returns `object`.
       */
      function copyObject(source, props, object, customizer) {
        var isNew = !object;
        object || (object = {});
  
        var index = -1,
            length = props.length;
  
        while (++index < length) {
          var key = props[index];
  
          var newValue = customizer
            ? customizer(object[key], source[key], key, object, source)
            : undefined;
  
          if (newValue === undefined) {
            newValue = source[key];
          }
          if (isNew) {
            baseAssignValue(object, key, newValue);
          } else {
            assignValue(object, key, newValue);
          }
        }
        return object;
      }
  
      /**
       * Copies own symbols of `source` to `object`.
       *
       * @private
       * @param {Object} source The object to copy symbols from.
       * @param {Object} [object={}] The object to copy symbols to.
       * @returns {Object} Returns `object`.
       */
      function copySymbols(source, object) {
        return copyObject(source, getSymbols(source), object);
      }
  
      /**
       * Copies own and inherited symbols of `source` to `object`.
       *
       * @private
       * @param {Object} source The object to copy symbols from.
       * @param {Object} [object={}] The object to copy symbols to.
       * @returns {Object} Returns `object`.
       */
      function copySymbolsIn(source, object) {
        return copyObject(source, getSymbolsIn(source), object);
      }
  
      /**
       * Creates a function like `_.groupBy`.
       *
       * @private
       * @param {Function} setter The function to set accumulator values.
       * @param {Function} [initializer] The accumulator object initializer.
       * @returns {Function} Returns the new aggregator function.
       */
      function createAggregator(setter, initializer) {
        return function(collection, iteratee) {
          var func = isArray(collection) ? arrayAggregator : baseAggregator,
              accumulator = initializer ? initializer() : {};
  
          return func(collection, setter, getIteratee(iteratee, 2), accumulator);
        };
      }
  
      /**
       * Creates a function like `_.assign`.
       *
       * @private
       * @param {Function} assigner The function to assign values.
       * @returns {Function} Returns the new assigner function.
       */
      function createAssigner(assigner) {
        return baseRest(function(object, sources) {
          var index = -1,
              length = sources.length,
              customizer = length > 1 ? sources[length - 1] : undefined,
              guard = length > 2 ? sources[2] : undefined;
  
          customizer = (assigner.length > 3 && typeof customizer == 'function')
            ? (length--, customizer)
            : undefined;
  
          if (guard && isIterateeCall(sources[0], sources[1], guard)) {
            customizer = length < 3 ? undefined : customizer;
            length = 1;
          }
          object = Object(object);
          while (++index < length) {
            var source = sources[index];
            if (source) {
              assigner(object, source, index, customizer);
            }
          }
          return object;
        });
      }
  
      /**
       * Creates a `baseEach` or `baseEachRight` function.
       *
       * @private
       * @param {Function} eachFunc The function to iterate over a collection.
       * @param {boolean} [fromRight] Specify iterating from right to left.
       * @returns {Function} Returns the new base function.
       */
      function createBaseEach(eachFunc, fromRight) {
        return function(collection, iteratee) {
          if (collection == null) {
            return collection;
          }
          if (!isArrayLike(collection)) {
            return eachFunc(collection, iteratee);
          }
          var length = collection.length,
              index = fromRight ? length : -1,
              iterable = Object(collection);
  
          while ((fromRight ? index-- : ++index < length)) {
            if (iteratee(iterable[index], index, iterable) === false) {
              break;
            }
          }
          return collection;
        };
      }
  
      /**
       * Creates a base function for methods like `_.forIn` and `_.forOwn`.
       *
       * @private
       * @param {boolean} [fromRight] Specify iterating from right to left.
       * @returns {Function} Returns the new base function.
       */
      function createBaseFor(fromRight) {
        return function(object, iteratee, keysFunc) {
          var index = -1,
              iterable = Object(object),
              props = keysFunc(object),
              length = props.length;
  
          while (length--) {
            var key = props[fromRight ? length : ++index];
            if (iteratee(iterable[key], key, iterable) === false) {
              break;
            }
          }
          return object;
        };
      }
  
      /**
       * Creates a function that wraps `func` to invoke it with the optional `this`
       * binding of `thisArg`.
       *
       * @private
       * @param {Function} func The function to wrap.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @param {*} [thisArg] The `this` binding of `func`.
       * @returns {Function} Returns the new wrapped function.
       */
      function createBind(func, bitmask, thisArg) {
        var isBind = bitmask & WRAP_BIND_FLAG,
            Ctor = createCtor(func);
  
        function wrapper() {
          var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
          return fn.apply(isBind ? thisArg : this, arguments);
        }
        return wrapper;
      }
  
      /**
       * Creates a function like `_.lowerFirst`.
       *
       * @private
       * @param {string} methodName The name of the `String` case method to use.
       * @returns {Function} Returns the new case function.
       */
      function createCaseFirst(methodName) {
        return function(string) {
          string = toString(string);
  
          var strSymbols = hasUnicode(string)
            ? stringToArray(string)
            : undefined;
  
          var chr = strSymbols
            ? strSymbols[0]
            : string.charAt(0);
  
          var trailing = strSymbols
            ? castSlice(strSymbols, 1).join('')
            : string.slice(1);
  
          return chr[methodName]() + trailing;
        };
      }
  
      /**
       * Creates a function like `_.camelCase`.
       *
       * @private
       * @param {Function} callback The function to combine each word.
       * @returns {Function} Returns the new compounder function.
       */
      function createCompounder(callback) {
        return function(string) {
          return arrayReduce(words(deburr(string).replace(reApos, '')), callback, '');
        };
      }
  
      /**
       * Creates a function that produces an instance of `Ctor` regardless of
       * whether it was invoked as part of a `new` expression or by `call` or `apply`.
       *
       * @private
       * @param {Function} Ctor The constructor to wrap.
       * @returns {Function} Returns the new wrapped function.
       */
      function createCtor(Ctor) {
        return function() {
          // Use a `switch` statement to work with class constructors. See
          // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
          // for more details.
          var args = arguments;
          switch (args.length) {
            case 0: return new Ctor;
            case 1: return new Ctor(args[0]);
            case 2: return new Ctor(args[0], args[1]);
            case 3: return new Ctor(args[0], args[1], args[2]);
            case 4: return new Ctor(args[0], args[1], args[2], args[3]);
            case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]);
            case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]);
            case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
          }
          var thisBinding = baseCreate(Ctor.prototype),
              result = Ctor.apply(thisBinding, args);
  
          // Mimic the constructor's `return` behavior.
          // See https://es5.github.io/#x13.2.2 for more details.
          return isObject(result) ? result : thisBinding;
        };
      }
  
      /**
       * Creates a function that wraps `func` to enable currying.
       *
       * @private
       * @param {Function} func The function to wrap.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @param {number} arity The arity of `func`.
       * @returns {Function} Returns the new wrapped function.
       */
      function createCurry(func, bitmask, arity) {
        var Ctor = createCtor(func);
  
        function wrapper() {
          var length = arguments.length,
              args = Array(length),
              index = length,
              placeholder = getHolder(wrapper);
  
          while (index--) {
            args[index] = arguments[index];
          }
          var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder)
            ? []
            : replaceHolders(args, placeholder);
  
          length -= holders.length;
          if (length < arity) {
            return createRecurry(
              func, bitmask, createHybrid, wrapper.placeholder, undefined,
              args, holders, undefined, undefined, arity - length);
          }
          var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
          return apply(fn, this, args);
        }
        return wrapper;
      }
  
      /**
       * Creates a `_.find` or `_.findLast` function.
       *
       * @private
       * @param {Function} findIndexFunc The function to find the collection index.
       * @returns {Function} Returns the new find function.
       */
      function createFind(findIndexFunc) {
        return function(collection, predicate, fromIndex) {
          var iterable = Object(collection);
          if (!isArrayLike(collection)) {
            var iteratee = getIteratee(predicate, 3);
            collection = keys(collection);
            predicate = function(key) { return iteratee(iterable[key], key, iterable); };
          }
          var index = findIndexFunc(collection, predicate, fromIndex);
          return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
        };
      }
  
      /**
       * Creates a `_.flow` or `_.flowRight` function.
       *
       * @private
       * @param {boolean} [fromRight] Specify iterating from right to left.
       * @returns {Function} Returns the new flow function.
       */
      function createFlow(fromRight) {
        return flatRest(function(funcs) {
          var length = funcs.length,
              index = length,
              prereq = LodashWrapper.prototype.thru;
  
          if (fromRight) {
            funcs.reverse();
          }
          while (index--) {
            var func = funcs[index];
            if (typeof func != 'function') {
              throw new TypeError(FUNC_ERROR_TEXT);
            }
            if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
              var wrapper = new LodashWrapper([], true);
            }
          }
          index = wrapper ? index : length;
          while (++index < length) {
            func = funcs[index];
  
            var funcName = getFuncName(func),
                data = funcName == 'wrapper' ? getData(func) : undefined;
  
            if (data && isLaziable(data[0]) &&
                  data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) &&
                  !data[4].length && data[9] == 1
                ) {
              wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
            } else {
              wrapper = (func.length == 1 && isLaziable(func))
                ? wrapper[funcName]()
                : wrapper.thru(func);
            }
          }
          return function() {
            var args = arguments,
                value = args[0];
  
            if (wrapper && args.length == 1 && isArray(value)) {
              return wrapper.plant(value).value();
            }
            var index = 0,
                result = length ? funcs[index].apply(this, args) : value;
  
            while (++index < length) {
              result = funcs[index].call(this, result);
            }
            return result;
          };
        });
      }
  
      /**
       * Creates a function that wraps `func` to invoke it with optional `this`
       * binding of `thisArg`, partial application, and currying.
       *
       * @private
       * @param {Function|string} func The function or method name to wrap.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @param {*} [thisArg] The `this` binding of `func`.
       * @param {Array} [partials] The arguments to prepend to those provided to
       *  the new function.
       * @param {Array} [holders] The `partials` placeholder indexes.
       * @param {Array} [partialsRight] The arguments to append to those provided
       *  to the new function.
       * @param {Array} [holdersRight] The `partialsRight` placeholder indexes.
       * @param {Array} [argPos] The argument positions of the new function.
       * @param {number} [ary] The arity cap of `func`.
       * @param {number} [arity] The arity of `func`.
       * @returns {Function} Returns the new wrapped function.
       */
      function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
        var isAry = bitmask & WRAP_ARY_FLAG,
            isBind = bitmask & WRAP_BIND_FLAG,
            isBindKey = bitmask & WRAP_BIND_KEY_FLAG,
            isCurried = bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG),
            isFlip = bitmask & WRAP_FLIP_FLAG,
            Ctor = isBindKey ? undefined : createCtor(func);
  
        function wrapper() {
          var length = arguments.length,
              args = Array(length),
              index = length;
  
          while (index--) {
            args[index] = arguments[index];
          }
          if (isCurried) {
            var placeholder = getHolder(wrapper),
                holdersCount = countHolders(args, placeholder);
          }
          if (partials) {
            args = composeArgs(args, partials, holders, isCurried);
          }
          if (partialsRight) {
            args = composeArgsRight(args, partialsRight, holdersRight, isCurried);
          }
          length -= holdersCount;
          if (isCurried && length < arity) {
            var newHolders = replaceHolders(args, placeholder);
            return createRecurry(
              func, bitmask, createHybrid, wrapper.placeholder, thisArg,
              args, newHolders, argPos, ary, arity - length
            );
          }
          var thisBinding = isBind ? thisArg : this,
              fn = isBindKey ? thisBinding[func] : func;
  
          length = args.length;
          if (argPos) {
            args = reorder(args, argPos);
          } else if (isFlip && length > 1) {
            args.reverse();
          }
          if (isAry && ary < length) {
            args.length = ary;
          }
          if (this && this !== root && this instanceof wrapper) {
            fn = Ctor || createCtor(fn);
          }
          return fn.apply(thisBinding, args);
        }
        return wrapper;
      }
  
      /**
       * Creates a function like `_.invertBy`.
       *
       * @private
       * @param {Function} setter The function to set accumulator values.
       * @param {Function} toIteratee The function to resolve iteratees.
       * @returns {Function} Returns the new inverter function.
       */
      function createInverter(setter, toIteratee) {
        return function(object, iteratee) {
          return baseInverter(object, setter, toIteratee(iteratee), {});
        };
      }
  
      /**
       * Creates a function that performs a mathematical operation on two values.
       *
       * @private
       * @param {Function} operator The function to perform the operation.
       * @param {number} [defaultValue] The value used for `undefined` arguments.
       * @returns {Function} Returns the new mathematical operation function.
       */
      function createMathOperation(operator, defaultValue) {
        return function(value, other) {
          var result;
          if (value === undefined && other === undefined) {
            return defaultValue;
          }
          if (value !== undefined) {
            result = value;
          }
          if (other !== undefined) {
            if (result === undefined) {
              return other;
            }
            if (typeof value == 'string' || typeof other == 'string') {
              value = baseToString(value);
              other = baseToString(other);
            } else {
              value = baseToNumber(value);
              other = baseToNumber(other);
            }
            result = operator(value, other);
          }
          return result;
        };
      }
  
      /**
       * Creates a function like `_.over`.
       *
       * @private
       * @param {Function} arrayFunc The function to iterate over iteratees.
       * @returns {Function} Returns the new over function.
       */
      function createOver(arrayFunc) {
        return flatRest(function(iteratees) {
          iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
          return baseRest(function(args) {
            var thisArg = this;
            return arrayFunc(iteratees, function(iteratee) {
              return apply(iteratee, thisArg, args);
            });
          });
        });
      }
  
      /**
       * Creates the padding for `string` based on `length`. The `chars` string
       * is truncated if the number of characters exceeds `length`.
       *
       * @private
       * @param {number} length The padding length.
       * @param {string} [chars=' '] The string used as padding.
       * @returns {string} Returns the padding for `string`.
       */
      function createPadding(length, chars) {
        chars = chars === undefined ? ' ' : baseToString(chars);
  
        var charsLength = chars.length;
        if (charsLength < 2) {
          return charsLength ? baseRepeat(chars, length) : chars;
        }
        var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
        return hasUnicode(chars)
          ? castSlice(stringToArray(result), 0, length).join('')
          : result.slice(0, length);
      }
  
      /**
       * Creates a function that wraps `func` to invoke it with the `this` binding
       * of `thisArg` and `partials` prepended to the arguments it receives.
       *
       * @private
       * @param {Function} func The function to wrap.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @param {*} thisArg The `this` binding of `func`.
       * @param {Array} partials The arguments to prepend to those provided to
       *  the new function.
       * @returns {Function} Returns the new wrapped function.
       */
      function createPartial(func, bitmask, thisArg, partials) {
        var isBind = bitmask & WRAP_BIND_FLAG,
            Ctor = createCtor(func);
  
        function wrapper() {
          var argsIndex = -1,
              argsLength = arguments.length,
              leftIndex = -1,
              leftLength = partials.length,
              args = Array(leftLength + argsLength),
              fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
  
          while (++leftIndex < leftLength) {
            args[leftIndex] = partials[leftIndex];
          }
          while (argsLength--) {
            args[leftIndex++] = arguments[++argsIndex];
          }
          return apply(fn, isBind ? thisArg : this, args);
        }
        return wrapper;
      }
  
      /**
       * Creates a `_.range` or `_.rangeRight` function.
       *
       * @private
       * @param {boolean} [fromRight] Specify iterating from right to left.
       * @returns {Function} Returns the new range function.
       */
      function createRange(fromRight) {
        return function(start, end, step) {
          if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
            end = step = undefined;
          }
          // Ensure the sign of `-0` is preserved.
          start = toFinite(start);
          if (end === undefined) {
            end = start;
            start = 0;
          } else {
            end = toFinite(end);
          }
          step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);
          return baseRange(start, end, step, fromRight);
        };
      }
  
      /**
       * Creates a function that performs a relational operation on two values.
       *
       * @private
       * @param {Function} operator The function to perform the operation.
       * @returns {Function} Returns the new relational operation function.
       */
      function createRelationalOperation(operator) {
        return function(value, other) {
          if (!(typeof value == 'string' && typeof other == 'string')) {
            value = toNumber(value);
            other = toNumber(other);
          }
          return operator(value, other);
        };
      }
  
      /**
       * Creates a function that wraps `func` to continue currying.
       *
       * @private
       * @param {Function} func The function to wrap.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @param {Function} wrapFunc The function to create the `func` wrapper.
       * @param {*} placeholder The placeholder value.
       * @param {*} [thisArg] The `this` binding of `func`.
       * @param {Array} [partials] The arguments to prepend to those provided to
       *  the new function.
       * @param {Array} [holders] The `partials` placeholder indexes.
       * @param {Array} [argPos] The argument positions of the new function.
       * @param {number} [ary] The arity cap of `func`.
       * @param {number} [arity] The arity of `func`.
       * @returns {Function} Returns the new wrapped function.
       */
      function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
        var isCurry = bitmask & WRAP_CURRY_FLAG,
            newHolders = isCurry ? holders : undefined,
            newHoldersRight = isCurry ? undefined : holders,
            newPartials = isCurry ? partials : undefined,
            newPartialsRight = isCurry ? undefined : partials;
  
        bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG);
        bitmask &= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG);
  
        if (!(bitmask & WRAP_CURRY_BOUND_FLAG)) {
          bitmask &= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG);
        }
        var newData = [
          func, bitmask, thisArg, newPartials, newHolders, newPartialsRight,
          newHoldersRight, argPos, ary, arity
        ];
  
        var result = wrapFunc.apply(undefined, newData);
        if (isLaziable(func)) {
          setData(result, newData);
        }
        result.placeholder = placeholder;
        return setWrapToString(result, func, bitmask);
      }
  
      /**
       * Creates a function like `_.round`.
       *
       * @private
       * @param {string} methodName The name of the `Math` method to use when rounding.
       * @returns {Function} Returns the new round function.
       */
      function createRound(methodName) {
        var func = Math[methodName];
        return function(number, precision) {
          number = toNumber(number);
          precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
          if (precision) {
            // Shift with exponential notation to avoid floating-point issues.
            // See [MDN](https://mdn.io/round#Examples) for more details.
            var pair = (toString(number) + 'e').split('e'),
                value = func(pair[0] + 'e' + (+pair[1] + precision));
  
            pair = (toString(value) + 'e').split('e');
            return +(pair[0] + 'e' + (+pair[1] - precision));
          }
          return func(number);
        };
      }
  
      /**
       * Creates a set object of `values`.
       *
       * @private
       * @param {Array} values The values to add to the set.
       * @returns {Object} Returns the new set.
       */
      var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {
        return new Set(values);
      };
  
      /**
       * Creates a `_.toPairs` or `_.toPairsIn` function.
       *
       * @private
       * @param {Function} keysFunc The function to get the keys of a given object.
       * @returns {Function} Returns the new pairs function.
       */
      function createToPairs(keysFunc) {
        return function(object) {
          var tag = getTag(object);
          if (tag == mapTag) {
            return mapToArray(object);
          }
          if (tag == setTag) {
            return setToPairs(object);
          }
          return baseToPairs(object, keysFunc(object));
        };
      }
  
      /**
       * Creates a function that either curries or invokes `func` with optional
       * `this` binding and partially applied arguments.
       *
       * @private
       * @param {Function|string} func The function or method name to wrap.
       * @param {number} bitmask The bitmask flags.
       *    1 - `_.bind`
       *    2 - `_.bindKey`
       *    4 - `_.curry` or `_.curryRight` of a bound function
       *    8 - `_.curry`
       *   16 - `_.curryRight`
       *   32 - `_.partial`
       *   64 - `_.partialRight`
       *  128 - `_.rearg`
       *  256 - `_.ary`
       *  512 - `_.flip`
       * @param {*} [thisArg] The `this` binding of `func`.
       * @param {Array} [partials] The arguments to be partially applied.
       * @param {Array} [holders] The `partials` placeholder indexes.
       * @param {Array} [argPos] The argument positions of the new function.
       * @param {number} [ary] The arity cap of `func`.
       * @param {number} [arity] The arity of `func`.
       * @returns {Function} Returns the new wrapped function.
       */
      function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
        var isBindKey = bitmask & WRAP_BIND_KEY_FLAG;
        if (!isBindKey && typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        var length = partials ? partials.length : 0;
        if (!length) {
          bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);
          partials = holders = undefined;
        }
        ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);
        arity = arity === undefined ? arity : toInteger(arity);
        length -= holders ? holders.length : 0;
  
        if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {
          var partialsRight = partials,
              holdersRight = holders;
  
          partials = holders = undefined;
        }
        var data = isBindKey ? undefined : getData(func);
  
        var newData = [
          func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
          argPos, ary, arity
        ];
  
        if (data) {
          mergeData(newData, data);
        }
        func = newData[0];
        bitmask = newData[1];
        thisArg = newData[2];
        partials = newData[3];
        holders = newData[4];
        arity = newData[9] = newData[9] === undefined
          ? (isBindKey ? 0 : func.length)
          : nativeMax(newData[9] - length, 0);
  
        if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
          bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
        }
        if (!bitmask || bitmask == WRAP_BIND_FLAG) {
          var result = createBind(func, bitmask, thisArg);
        } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
          result = createCurry(func, bitmask, arity);
        } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {
          result = createPartial(func, bitmask, thisArg, partials);
        } else {
          result = createHybrid.apply(undefined, newData);
        }
        var setter = data ? baseSetData : setData;
        return setWrapToString(setter(result, newData), func, bitmask);
      }
  
      /**
       * Used by `_.defaults` to customize its `_.assignIn` use to assign properties
       * of source objects to the destination object for all destination properties
       * that resolve to `undefined`.
       *
       * @private
       * @param {*} objValue The destination value.
       * @param {*} srcValue The source value.
       * @param {string} key The key of the property to assign.
       * @param {Object} object The parent object of `objValue`.
       * @returns {*} Returns the value to assign.
       */
      function customDefaultsAssignIn(objValue, srcValue, key, object) {
        if (objValue === undefined ||
            (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
          return srcValue;
        }
        return objValue;
      }
  
      /**
       * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source
       * objects into destination objects that are passed thru.
       *
       * @private
       * @param {*} objValue The destination value.
       * @param {*} srcValue The source value.
       * @param {string} key The key of the property to merge.
       * @param {Object} object The parent object of `objValue`.
       * @param {Object} source The parent object of `srcValue`.
       * @param {Object} [stack] Tracks traversed source values and their merged
       *  counterparts.
       * @returns {*} Returns the value to assign.
       */
      function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
        if (isObject(objValue) && isObject(srcValue)) {
          // Recursively merge objects and arrays (susceptible to call stack limits).
          stack.set(srcValue, objValue);
          baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
          stack['delete'](srcValue);
        }
        return objValue;
      }
  
      /**
       * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain
       * objects.
       *
       * @private
       * @param {*} value The value to inspect.
       * @param {string} key The key of the property to inspect.
       * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`.
       */
      function customOmitClone(value) {
        return isPlainObject(value) ? undefined : value;
      }
  
      /**
       * A specialized version of `baseIsEqualDeep` for arrays with support for
       * partial deep comparisons.
       *
       * @private
       * @param {Array} array The array to compare.
       * @param {Array} other The other array to compare.
       * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
       * @param {Function} customizer The function to customize comparisons.
       * @param {Function} equalFunc The function to determine equivalents of values.
       * @param {Object} stack Tracks traversed `array` and `other` objects.
       * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
       */
      function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {
        var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
            arrLength = array.length,
            othLength = other.length;
  
        if (arrLength != othLength && !(isPartial && othLength > arrLength)) {
          return false;
        }
        // Assume cyclic values are equal.
        var stacked = stack.get(array);
        if (stacked && stack.get(other)) {
          return stacked == other;
        }
        var index = -1,
            result = true,
            seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;
  
        stack.set(array, other);
        stack.set(other, array);
  
        // Ignore non-index properties.
        while (++index < arrLength) {
          var arrValue = array[index],
              othValue = other[index];
  
          if (customizer) {
            var compared = isPartial
              ? customizer(othValue, arrValue, index, other, array, stack)
              : customizer(arrValue, othValue, index, array, other, stack);
          }
          if (compared !== undefined) {
            if (compared) {
              continue;
            }
            result = false;
            break;
          }
          // Recursively compare arrays (susceptible to call stack limits).
          if (seen) {
            if (!arraySome(other, function(othValue, othIndex) {
                  if (!cacheHas(seen, othIndex) &&
                      (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {
                    return seen.push(othIndex);
                  }
                })) {
              result = false;
              break;
            }
          } else if (!(
                arrValue === othValue ||
                  equalFunc(arrValue, othValue, bitmask, customizer, stack)
              )) {
            result = false;
            break;
          }
        }
        stack['delete'](array);
        stack['delete'](other);
        return result;
      }
  
      /**
       * A specialized version of `baseIsEqualDeep` for comparing objects of
       * the same `toStringTag`.
       *
       * **Note:** This function only supports comparing values with tags of
       * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
       *
       * @private
       * @param {Object} object The object to compare.
       * @param {Object} other The other object to compare.
       * @param {string} tag The `toStringTag` of the objects to compare.
       * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
       * @param {Function} customizer The function to customize comparisons.
       * @param {Function} equalFunc The function to determine equivalents of values.
       * @param {Object} stack Tracks traversed `object` and `other` objects.
       * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
       */
      function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {
        switch (tag) {
          case dataViewTag:
            if ((object.byteLength != other.byteLength) ||
                (object.byteOffset != other.byteOffset)) {
              return false;
            }
            object = object.buffer;
            other = other.buffer;
  
          case arrayBufferTag:
            if ((object.byteLength != other.byteLength) ||
                !equalFunc(new Uint8Array(object), new Uint8Array(other))) {
              return false;
            }
            return true;
  
          case boolTag:
          case dateTag:
          case numberTag:
            // Coerce booleans to `1` or `0` and dates to milliseconds.
            // Invalid dates are coerced to `NaN`.
            return eq(+object, +other);
  
          case errorTag:
            return object.name == other.name && object.message == other.message;
  
          case regexpTag:
          case stringTag:
            // Coerce regexes to strings and treat strings, primitives and objects,
            // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
            // for more details.
            return object == (other + '');
  
          case mapTag:
            var convert = mapToArray;
  
          case setTag:
            var isPartial = bitmask & COMPARE_PARTIAL_FLAG;
            convert || (convert = setToArray);
  
            if (object.size != other.size && !isPartial) {
              return false;
            }
            // Assume cyclic values are equal.
            var stacked = stack.get(object);
            if (stacked) {
              return stacked == other;
            }
            bitmask |= COMPARE_UNORDERED_FLAG;
  
            // Recursively compare objects (susceptible to call stack limits).
            stack.set(object, other);
            var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);
            stack['delete'](object);
            return result;
  
          case symbolTag:
            if (symbolValueOf) {
              return symbolValueOf.call(object) == symbolValueOf.call(other);
            }
        }
        return false;
      }
  
      /**
       * A specialized version of `baseIsEqualDeep` for objects with support for
       * partial deep comparisons.
       *
       * @private
       * @param {Object} object The object to compare.
       * @param {Object} other The other object to compare.
       * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
       * @param {Function} customizer The function to customize comparisons.
       * @param {Function} equalFunc The function to determine equivalents of values.
       * @param {Object} stack Tracks traversed `object` and `other` objects.
       * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
       */
      function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {
        var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
            objProps = getAllKeys(object),
            objLength = objProps.length,
            othProps = getAllKeys(other),
            othLength = othProps.length;
  
        if (objLength != othLength && !isPartial) {
          return false;
        }
        var index = objLength;
        while (index--) {
          var key = objProps[index];
          if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
            return false;
          }
        }
        // Assume cyclic values are equal.
        var stacked = stack.get(object);
        if (stacked && stack.get(other)) {
          return stacked == other;
        }
        var result = true;
        stack.set(object, other);
        stack.set(other, object);
  
        var skipCtor = isPartial;
        while (++index < objLength) {
          key = objProps[index];
          var objValue = object[key],
              othValue = other[key];
  
          if (customizer) {
            var compared = isPartial
              ? customizer(othValue, objValue, key, other, object, stack)
              : customizer(objValue, othValue, key, object, other, stack);
          }
          // Recursively compare objects (susceptible to call stack limits).
          if (!(compared === undefined
                ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))
                : compared
              )) {
            result = false;
            break;
          }
          skipCtor || (skipCtor = key == 'constructor');
        }
        if (result && !skipCtor) {
          var objCtor = object.constructor,
              othCtor = other.constructor;
  
          // Non `Object` object instances with different constructors are not equal.
          if (objCtor != othCtor &&
              ('constructor' in object && 'constructor' in other) &&
              !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
                typeof othCtor == 'function' && othCtor instanceof othCtor)) {
            result = false;
          }
        }
        stack['delete'](object);
        stack['delete'](other);
        return result;
      }
  
      /**
       * A specialized version of `baseRest` which flattens the rest array.
       *
       * @private
       * @param {Function} func The function to apply a rest parameter to.
       * @returns {Function} Returns the new function.
       */
      function flatRest(func) {
        return setToString(overRest(func, undefined, flatten), func + '');
      }
  
      /**
       * Creates an array of own enumerable property names and symbols of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names and symbols.
       */
      function getAllKeys(object) {
        return baseGetAllKeys(object, keys, getSymbols);
      }
  
      /**
       * Creates an array of own and inherited enumerable property names and
       * symbols of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names and symbols.
       */
      function getAllKeysIn(object) {
        return baseGetAllKeys(object, keysIn, getSymbolsIn);
      }
  
      /**
       * Gets metadata for `func`.
       *
       * @private
       * @param {Function} func The function to query.
       * @returns {*} Returns the metadata for `func`.
       */
      var getData = !metaMap ? noop : function(func) {
        return metaMap.get(func);
      };
  
      /**
       * Gets the name of `func`.
       *
       * @private
       * @param {Function} func The function to query.
       * @returns {string} Returns the function name.
       */
      function getFuncName(func) {
        var result = (func.name + ''),
            array = realNames[result],
            length = hasOwnProperty.call(realNames, result) ? array.length : 0;
  
        while (length--) {
          var data = array[length],
              otherFunc = data.func;
          if (otherFunc == null || otherFunc == func) {
            return data.name;
          }
        }
        return result;
      }
  
      /**
       * Gets the argument placeholder value for `func`.
       *
       * @private
       * @param {Function} func The function to inspect.
       * @returns {*} Returns the placeholder value.
       */
      function getHolder(func) {
        var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func;
        return object.placeholder;
      }
  
      /**
       * Gets the appropriate "iteratee" function. If `_.iteratee` is customized,
       * this function returns the custom method, otherwise it returns `baseIteratee`.
       * If arguments are provided, the chosen function is invoked with them and
       * its result is returned.
       *
       * @private
       * @param {*} [value] The value to convert to an iteratee.
       * @param {number} [arity] The arity of the created iteratee.
       * @returns {Function} Returns the chosen function or its result.
       */
      function getIteratee() {
        var result = lodash.iteratee || iteratee;
        result = result === iteratee ? baseIteratee : result;
        return arguments.length ? result(arguments[0], arguments[1]) : result;
      }
  
      /**
       * Gets the data for `map`.
       *
       * @private
       * @param {Object} map The map to query.
       * @param {string} key The reference key.
       * @returns {*} Returns the map data.
       */
      function getMapData(map, key) {
        var data = map.__data__;
        return isKeyable(key)
          ? data[typeof key == 'string' ? 'string' : 'hash']
          : data.map;
      }
  
      /**
       * Gets the property names, values, and compare flags of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the match data of `object`.
       */
      function getMatchData(object) {
        var result = keys(object),
            length = result.length;
  
        while (length--) {
          var key = result[length],
              value = object[key];
  
          result[length] = [key, value, isStrictComparable(value)];
        }
        return result;
      }
  
      /**
       * Gets the native function at `key` of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {string} key The key of the method to get.
       * @returns {*} Returns the function if it's native, else `undefined`.
       */
      function getNative(object, key) {
        var value = getValue(object, key);
        return baseIsNative(value) ? value : undefined;
      }
  
      /**
       * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
       *
       * @private
       * @param {*} value The value to query.
       * @returns {string} Returns the raw `toStringTag`.
       */
      function getRawTag(value) {
        var isOwn = hasOwnProperty.call(value, symToStringTag),
            tag = value[symToStringTag];
  
        try {
          value[symToStringTag] = undefined;
          var unmasked = true;
        } catch (e) {}
  
        var result = nativeObjectToString.call(value);
        if (unmasked) {
          if (isOwn) {
            value[symToStringTag] = tag;
          } else {
            delete value[symToStringTag];
          }
        }
        return result;
      }
  
      /**
       * Creates an array of the own enumerable symbols of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of symbols.
       */
      var getSymbols = !nativeGetSymbols ? stubArray : function(object) {
        if (object == null) {
          return [];
        }
        object = Object(object);
        return arrayFilter(nativeGetSymbols(object), function(symbol) {
          return propertyIsEnumerable.call(object, symbol);
        });
      };
  
      /**
       * Creates an array of the own and inherited enumerable symbols of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of symbols.
       */
      var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
        var result = [];
        while (object) {
          arrayPush(result, getSymbols(object));
          object = getPrototype(object);
        }
        return result;
      };
  
      /**
       * Gets the `toStringTag` of `value`.
       *
       * @private
       * @param {*} value The value to query.
       * @returns {string} Returns the `toStringTag`.
       */
      var getTag = baseGetTag;
  
      // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
      if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
          (Map && getTag(new Map) != mapTag) ||
          (Promise && getTag(Promise.resolve()) != promiseTag) ||
          (Set && getTag(new Set) != setTag) ||
          (WeakMap && getTag(new WeakMap) != weakMapTag)) {
        getTag = function(value) {
          var result = baseGetTag(value),
              Ctor = result == objectTag ? value.constructor : undefined,
              ctorString = Ctor ? toSource(Ctor) : '';
  
          if (ctorString) {
            switch (ctorString) {
              case dataViewCtorString: return dataViewTag;
              case mapCtorString: return mapTag;
              case promiseCtorString: return promiseTag;
              case setCtorString: return setTag;
              case weakMapCtorString: return weakMapTag;
            }
          }
          return result;
        };
      }
  
      /**
       * Gets the view, applying any `transforms` to the `start` and `end` positions.
       *
       * @private
       * @param {number} start The start of the view.
       * @param {number} end The end of the view.
       * @param {Array} transforms The transformations to apply to the view.
       * @returns {Object} Returns an object containing the `start` and `end`
       *  positions of the view.
       */
      function getView(start, end, transforms) {
        var index = -1,
            length = transforms.length;
  
        while (++index < length) {
          var data = transforms[index],
              size = data.size;
  
          switch (data.type) {
            case 'drop':      start += size; break;
            case 'dropRight': end -= size; break;
            case 'take':      end = nativeMin(end, start + size); break;
            case 'takeRight': start = nativeMax(start, end - size); break;
          }
        }
        return { 'start': start, 'end': end };
      }
  
      /**
       * Extracts wrapper details from the `source` body comment.
       *
       * @private
       * @param {string} source The source to inspect.
       * @returns {Array} Returns the wrapper details.
       */
      function getWrapDetails(source) {
        var match = source.match(reWrapDetails);
        return match ? match[1].split(reSplitDetails) : [];
      }
  
      /**
       * Checks if `path` exists on `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {Array|string} path The path to check.
       * @param {Function} hasFunc The function to check properties.
       * @returns {boolean} Returns `true` if `path` exists, else `false`.
       */
      function hasPath(object, path, hasFunc) {
        path = castPath(path, object);
  
        var index = -1,
            length = path.length,
            result = false;
  
        while (++index < length) {
          var key = toKey(path[index]);
          if (!(result = object != null && hasFunc(object, key))) {
            break;
          }
          object = object[key];
        }
        if (result || ++index != length) {
          return result;
        }
        length = object == null ? 0 : object.length;
        return !!length && isLength(length) && isIndex(key, length) &&
          (isArray(object) || isArguments(object));
      }
  
      /**
       * Initializes an array clone.
       *
       * @private
       * @param {Array} array The array to clone.
       * @returns {Array} Returns the initialized clone.
       */
      function initCloneArray(array) {
        var length = array.length,
            result = array.constructor(length);
  
        // Add properties assigned by `RegExp#exec`.
        if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
          result.index = array.index;
          result.input = array.input;
        }
        return result;
      }
  
      /**
       * Initializes an object clone.
       *
       * @private
       * @param {Object} object The object to clone.
       * @returns {Object} Returns the initialized clone.
       */
      function initCloneObject(object) {
        return (typeof object.constructor == 'function' && !isPrototype(object))
          ? baseCreate(getPrototype(object))
          : {};
      }
  
      /**
       * Initializes an object clone based on its `toStringTag`.
       *
       * **Note:** This function only supports cloning values with tags of
       * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
       *
       * @private
       * @param {Object} object The object to clone.
       * @param {string} tag The `toStringTag` of the object to clone.
       * @param {Function} cloneFunc The function to clone values.
       * @param {boolean} [isDeep] Specify a deep clone.
       * @returns {Object} Returns the initialized clone.
       */
      function initCloneByTag(object, tag, cloneFunc, isDeep) {
        var Ctor = object.constructor;
        switch (tag) {
          case arrayBufferTag:
            return cloneArrayBuffer(object);
  
          case boolTag:
          case dateTag:
            return new Ctor(+object);
  
          case dataViewTag:
            return cloneDataView(object, isDeep);
  
          case float32Tag: case float64Tag:
          case int8Tag: case int16Tag: case int32Tag:
          case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
            return cloneTypedArray(object, isDeep);
  
          case mapTag:
            return cloneMap(object, isDeep, cloneFunc);
  
          case numberTag:
          case stringTag:
            return new Ctor(object);
  
          case regexpTag:
            return cloneRegExp(object);
  
          case setTag:
            return cloneSet(object, isDeep, cloneFunc);
  
          case symbolTag:
            return cloneSymbol(object);
        }
      }
  
      /**
       * Inserts wrapper `details` in a comment at the top of the `source` body.
       *
       * @private
       * @param {string} source The source to modify.
       * @returns {Array} details The details to insert.
       * @returns {string} Returns the modified source.
       */
      function insertWrapDetails(source, details) {
        var length = details.length;
        if (!length) {
          return source;
        }
        var lastIndex = length - 1;
        details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
        details = details.join(length > 2 ? ', ' : ' ');
        return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
      }
  
      /**
       * Checks if `value` is a flattenable `arguments` object or array.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
       */
      function isFlattenable(value) {
        return isArray(value) || isArguments(value) ||
          !!(spreadableSymbol && value && value[spreadableSymbol]);
      }
  
      /**
       * Checks if `value` is a valid array-like index.
       *
       * @private
       * @param {*} value The value to check.
       * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
       * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
       */
      function isIndex(value, length) {
        length = length == null ? MAX_SAFE_INTEGER : length;
        return !!length &&
          (typeof value == 'number' || reIsUint.test(value)) &&
          (value > -1 && value % 1 == 0 && value < length);
      }
  
      /**
       * Checks if the given arguments are from an iteratee call.
       *
       * @private
       * @param {*} value The potential iteratee value argument.
       * @param {*} index The potential iteratee index or key argument.
       * @param {*} object The potential iteratee object argument.
       * @returns {boolean} Returns `true` if the arguments are from an iteratee call,
       *  else `false`.
       */
      function isIterateeCall(value, index, object) {
        if (!isObject(object)) {
          return false;
        }
        var type = typeof index;
        if (type == 'number'
              ? (isArrayLike(object) && isIndex(index, object.length))
              : (type == 'string' && index in object)
            ) {
          return eq(object[index], value);
        }
        return false;
      }
  
      /**
       * Checks if `value` is a property name and not a property path.
       *
       * @private
       * @param {*} value The value to check.
       * @param {Object} [object] The object to query keys on.
       * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
       */
      function isKey(value, object) {
        if (isArray(value)) {
          return false;
        }
        var type = typeof value;
        if (type == 'number' || type == 'symbol' || type == 'boolean' ||
            value == null || isSymbol(value)) {
          return true;
        }
        return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
          (object != null && value in Object(object));
      }
  
      /**
       * Checks if `value` is suitable for use as unique object key.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
       */
      function isKeyable(value) {
        var type = typeof value;
        return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
          ? (value !== '__proto__')
          : (value === null);
      }
  
      /**
       * Checks if `func` has a lazy counterpart.
       *
       * @private
       * @param {Function} func The function to check.
       * @returns {boolean} Returns `true` if `func` has a lazy counterpart,
       *  else `false`.
       */
      function isLaziable(func) {
        var funcName = getFuncName(func),
            other = lodash[funcName];
  
        if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) {
          return false;
        }
        if (func === other) {
          return true;
        }
        var data = getData(other);
        return !!data && func === data[0];
      }
  
      /**
       * Checks if `func` has its source masked.
       *
       * @private
       * @param {Function} func The function to check.
       * @returns {boolean} Returns `true` if `func` is masked, else `false`.
       */
      function isMasked(func) {
        return !!maskSrcKey && (maskSrcKey in func);
      }
  
      /**
       * Checks if `func` is capable of being masked.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `func` is maskable, else `false`.
       */
      var isMaskable = coreJsData ? isFunction : stubFalse;
  
      /**
       * Checks if `value` is likely a prototype object.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
       */
      function isPrototype(value) {
        var Ctor = value && value.constructor,
            proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;
  
        return value === proto;
      }
  
      /**
       * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` if suitable for strict
       *  equality comparisons, else `false`.
       */
      function isStrictComparable(value) {
        return value === value && !isObject(value);
      }
  
      /**
       * A specialized version of `matchesProperty` for source values suitable
       * for strict equality comparisons, i.e. `===`.
       *
       * @private
       * @param {string} key The key of the property to get.
       * @param {*} srcValue The value to match.
       * @returns {Function} Returns the new spec function.
       */
      function matchesStrictComparable(key, srcValue) {
        return function(object) {
          if (object == null) {
            return false;
          }
          return object[key] === srcValue &&
            (srcValue !== undefined || (key in Object(object)));
        };
      }
  
      /**
       * A specialized version of `_.memoize` which clears the memoized function's
       * cache when it exceeds `MAX_MEMOIZE_SIZE`.
       *
       * @private
       * @param {Function} func The function to have its output memoized.
       * @returns {Function} Returns the new memoized function.
       */
      function memoizeCapped(func) {
        var result = memoize(func, function(key) {
          if (cache.size === MAX_MEMOIZE_SIZE) {
            cache.clear();
          }
          return key;
        });
  
        var cache = result.cache;
        return result;
      }
  
      /**
       * Merges the function metadata of `source` into `data`.
       *
       * Merging metadata reduces the number of wrappers used to invoke a function.
       * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
       * may be applied regardless of execution order. Methods like `_.ary` and
       * `_.rearg` modify function arguments, making the order in which they are
       * executed important, preventing the merging of metadata. However, we make
       * an exception for a safe combined case where curried functions have `_.ary`
       * and or `_.rearg` applied.
       *
       * @private
       * @param {Array} data The destination metadata.
       * @param {Array} source The source metadata.
       * @returns {Array} Returns `data`.
       */
      function mergeData(data, source) {
        var bitmask = data[1],
            srcBitmask = source[1],
            newBitmask = bitmask | srcBitmask,
            isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);
  
        var isCombo =
          ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
          ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
          ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));
  
        // Exit early if metadata can't be merged.
        if (!(isCommon || isCombo)) {
          return data;
        }
        // Use source `thisArg` if available.
        if (srcBitmask & WRAP_BIND_FLAG) {
          data[2] = source[2];
          // Set when currying a bound function.
          newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
        }
        // Compose partial arguments.
        var value = source[3];
        if (value) {
          var partials = data[3];
          data[3] = partials ? composeArgs(partials, value, source[4]) : value;
          data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
        }
        // Compose partial right arguments.
        value = source[5];
        if (value) {
          partials = data[5];
          data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
          data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
        }
        // Use source `argPos` if available.
        value = source[7];
        if (value) {
          data[7] = value;
        }
        // Use source `ary` if it's smaller.
        if (srcBitmask & WRAP_ARY_FLAG) {
          data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
        }
        // Use source `arity` if one is not provided.
        if (data[9] == null) {
          data[9] = source[9];
        }
        // Use source `func` and merge bitmasks.
        data[0] = source[0];
        data[1] = newBitmask;
  
        return data;
      }
  
      /**
       * This function is like
       * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
       * except that it includes inherited enumerable properties.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names.
       */
      function nativeKeysIn(object) {
        var result = [];
        if (object != null) {
          for (var key in Object(object)) {
            result.push(key);
          }
        }
        return result;
      }
  
      /**
       * Converts `value` to a string using `Object.prototype.toString`.
       *
       * @private
       * @param {*} value The value to convert.
       * @returns {string} Returns the converted string.
       */
      function objectToString(value) {
        return nativeObjectToString.call(value);
      }
  
      /**
       * A specialized version of `baseRest` which transforms the rest array.
       *
       * @private
       * @param {Function} func The function to apply a rest parameter to.
       * @param {number} [start=func.length-1] The start position of the rest parameter.
       * @param {Function} transform The rest array transform.
       * @returns {Function} Returns the new function.
       */
      function overRest(func, start, transform) {
        start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
        return function() {
          var args = arguments,
              index = -1,
              length = nativeMax(args.length - start, 0),
              array = Array(length);
  
          while (++index < length) {
            array[index] = args[start + index];
          }
          index = -1;
          var otherArgs = Array(start + 1);
          while (++index < start) {
            otherArgs[index] = args[index];
          }
          otherArgs[start] = transform(array);
          return apply(func, this, otherArgs);
        };
      }
  
      /**
       * Gets the parent value at `path` of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {Array} path The path to get the parent value of.
       * @returns {*} Returns the parent value.
       */
      function parent(object, path) {
        return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1));
      }
  
      /**
       * Reorder `array` according to the specified indexes where the element at
       * the first index is assigned as the first element, the element at
       * the second index is assigned as the second element, and so on.
       *
       * @private
       * @param {Array} array The array to reorder.
       * @param {Array} indexes The arranged array indexes.
       * @returns {Array} Returns `array`.
       */
      function reorder(array, indexes) {
        var arrLength = array.length,
            length = nativeMin(indexes.length, arrLength),
            oldArray = copyArray(array);
  
        while (length--) {
          var index = indexes[length];
          array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;
        }
        return array;
      }
  
      /**
       * Sets metadata for `func`.
       *
       * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
       * period of time, it will trip its breaker and transition to an identity
       * function to avoid garbage collection pauses in V8. See
       * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070)
       * for more details.
       *
       * @private
       * @param {Function} func The function to associate metadata with.
       * @param {*} data The metadata.
       * @returns {Function} Returns `func`.
       */
      var setData = shortOut(baseSetData);
  
      /**
       * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout).
       *
       * @private
       * @param {Function} func The function to delay.
       * @param {number} wait The number of milliseconds to delay invocation.
       * @returns {number|Object} Returns the timer id or timeout object.
       */
      var setTimeout = ctxSetTimeout || function(func, wait) {
        return root.setTimeout(func, wait);
      };
  
      /**
       * Sets the `toString` method of `func` to return `string`.
       *
       * @private
       * @param {Function} func The function to modify.
       * @param {Function} string The `toString` result.
       * @returns {Function} Returns `func`.
       */
      var setToString = shortOut(baseSetToString);
  
      /**
       * Sets the `toString` method of `wrapper` to mimic the source of `reference`
       * with wrapper details in a comment at the top of the source body.
       *
       * @private
       * @param {Function} wrapper The function to modify.
       * @param {Function} reference The reference function.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @returns {Function} Returns `wrapper`.
       */
      function setWrapToString(wrapper, reference, bitmask) {
        var source = (reference + '');
        return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
      }
  
      /**
       * Creates a function that'll short out and invoke `identity` instead
       * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
       * milliseconds.
       *
       * @private
       * @param {Function} func The function to restrict.
       * @returns {Function} Returns the new shortable function.
       */
      function shortOut(func) {
        var count = 0,
            lastCalled = 0;
  
        return function() {
          var stamp = nativeNow(),
              remaining = HOT_SPAN - (stamp - lastCalled);
  
          lastCalled = stamp;
          if (remaining > 0) {
            if (++count >= HOT_COUNT) {
              return arguments[0];
            }
          } else {
            count = 0;
          }
          return func.apply(undefined, arguments);
        };
      }
  
      /**
       * A specialized version of `_.shuffle` which mutates and sets the size of `array`.
       *
       * @private
       * @param {Array} array The array to shuffle.
       * @param {number} [size=array.length] The size of `array`.
       * @returns {Array} Returns `array`.
       */
      function shuffleSelf(array, size) {
        var index = -1,
            length = array.length,
            lastIndex = length - 1;
  
        size = size === undefined ? length : size;
        while (++index < size) {
          var rand = baseRandom(index, lastIndex),
              value = array[rand];
  
          array[rand] = array[index];
          array[index] = value;
        }
        array.length = size;
        return array;
      }
  
      /**
       * Converts `string` to a property path array.
       *
       * @private
       * @param {string} string The string to convert.
       * @returns {Array} Returns the property path array.
       */
      var stringToPath = memoizeCapped(function(string) {
        var result = [];
        if (reLeadingDot.test(string)) {
          result.push('');
        }
        string.replace(rePropName, function(match, number, quote, string) {
          result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
        });
        return result;
      });
  
      /**
       * Converts `value` to a string key if it's not a string or symbol.
       *
       * @private
       * @param {*} value The value to inspect.
       * @returns {string|symbol} Returns the key.
       */
      function toKey(value) {
        if (typeof value == 'string' || isSymbol(value)) {
          return value;
        }
        var result = (value + '');
        return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
      }
  
      /**
       * Converts `func` to its source code.
       *
       * @private
       * @param {Function} func The function to convert.
       * @returns {string} Returns the source code.
       */
      function toSource(func) {
        if (func != null) {
          try {
            return funcToString.call(func);
          } catch (e) {}
          try {
            return (func + '');
          } catch (e) {}
        }
        return '';
      }
  
      /**
       * Updates wrapper `details` based on `bitmask` flags.
       *
       * @private
       * @returns {Array} details The details to modify.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @returns {Array} Returns `details`.
       */
      function updateWrapDetails(details, bitmask) {
        arrayEach(wrapFlags, function(pair) {
          var value = '_.' + pair[0];
          if ((bitmask & pair[1]) && !arrayIncludes(details, value)) {
            details.push(value);
          }
        });
        return details.sort();
      }
  
      /**
       * Creates a clone of `wrapper`.
       *
       * @private
       * @param {Object} wrapper The wrapper to clone.
       * @returns {Object} Returns the cloned wrapper.
       */
      function wrapperClone(wrapper) {
        if (wrapper instanceof LazyWrapper) {
          return wrapper.clone();
        }
        var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__);
        result.__actions__ = copyArray(wrapper.__actions__);
        result.__index__  = wrapper.__index__;
        result.__values__ = wrapper.__values__;
        return result;
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates an array of elements split into groups the length of `size`.
       * If `array` can't be split evenly, the final chunk will be the remaining
       * elements.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to process.
       * @param {number} [size=1] The length of each chunk
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the new array of chunks.
       * @example
       *
       * _.chunk(['a', 'b', 'c', 'd'], 2);
       * // => [['a', 'b'], ['c', 'd']]
       *
       * _.chunk(['a', 'b', 'c', 'd'], 3);
       * // => [['a', 'b', 'c'], ['d']]
       */
      function chunk(array, size, guard) {
        if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {
          size = 1;
        } else {
          size = nativeMax(toInteger(size), 0);
        }
        var length = array == null ? 0 : array.length;
        if (!length || size < 1) {
          return [];
        }
        var index = 0,
            resIndex = 0,
            result = Array(nativeCeil(length / size));
  
        while (index < length) {
          result[resIndex++] = baseSlice(array, index, (index += size));
        }
        return result;
      }
  
      /**
       * Creates an array with all falsey values removed. The values `false`, `null`,
       * `0`, `""`, `undefined`, and `NaN` are falsey.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to compact.
       * @returns {Array} Returns the new array of filtered values.
       * @example
       *
       * _.compact([0, 1, false, 2, '', 3]);
       * // => [1, 2, 3]
       */
      function compact(array) {
        var index = -1,
            length = array == null ? 0 : array.length,
            resIndex = 0,
            result = [];
  
        while (++index < length) {
          var value = array[index];
          if (value) {
            result[resIndex++] = value;
          }
        }
        return result;
      }
  
      /**
       * Creates a new array concatenating `array` with any additional arrays
       * and/or values.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to concatenate.
       * @param {...*} [values] The values to concatenate.
       * @returns {Array} Returns the new concatenated array.
       * @example
       *
       * var array = [1];
       * var other = _.concat(array, 2, [3], [[4]]);
       *
       * console.log(other);
       * // => [1, 2, 3, [4]]
       *
       * console.log(array);
       * // => [1]
       */
      function concat() {
        var length = arguments.length;
        if (!length) {
          return [];
        }
        var args = Array(length - 1),
            array = arguments[0],
            index = length;
  
        while (index--) {
          args[index - 1] = arguments[index];
        }
        return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
      }
  
      /**
       * Creates an array of `array` values not included in the other given arrays
       * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons. The order and references of result values are
       * determined by the first array.
       *
       * **Note:** Unlike `_.pullAll`, this method returns a new array.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {...Array} [values] The values to exclude.
       * @returns {Array} Returns the new array of filtered values.
       * @see _.without, _.xor
       * @example
       *
       * _.difference([2, 1], [2, 3]);
       * // => [1]
       */
      var difference = baseRest(function(array, values) {
        return isArrayLikeObject(array)
          ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
          : [];
      });
  
      /**
       * This method is like `_.difference` except that it accepts `iteratee` which
       * is invoked for each element of `array` and `values` to generate the criterion
       * by which they're compared. The order and references of result values are
       * determined by the first array. The iteratee is invoked with one argument:
       * (value).
       *
       * **Note:** Unlike `_.pullAllBy`, this method returns a new array.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {...Array} [values] The values to exclude.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Array} Returns the new array of filtered values.
       * @example
       *
       * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
       * // => [1.2]
       *
       * // The `_.property` iteratee shorthand.
       * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
       * // => [{ 'x': 2 }]
       */
      var differenceBy = baseRest(function(array, values) {
        var iteratee = last(values);
        if (isArrayLikeObject(iteratee)) {
          iteratee = undefined;
        }
        return isArrayLikeObject(array)
          ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2))
          : [];
      });
  
      /**
       * This method is like `_.difference` except that it accepts `comparator`
       * which is invoked to compare elements of `array` to `values`. The order and
       * references of result values are determined by the first array. The comparator
       * is invoked with two arguments: (arrVal, othVal).
       *
       * **Note:** Unlike `_.pullAllWith`, this method returns a new array.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {...Array} [values] The values to exclude.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of filtered values.
       * @example
       *
       * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
       *
       * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
       * // => [{ 'x': 2, 'y': 1 }]
       */
      var differenceWith = baseRest(function(array, values) {
        var comparator = last(values);
        if (isArrayLikeObject(comparator)) {
          comparator = undefined;
        }
        return isArrayLikeObject(array)
          ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)
          : [];
      });
  
      /**
       * Creates a slice of `array` with `n` elements dropped from the beginning.
       *
       * @static
       * @memberOf _
       * @since 0.5.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {number} [n=1] The number of elements to drop.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * _.drop([1, 2, 3]);
       * // => [2, 3]
       *
       * _.drop([1, 2, 3], 2);
       * // => [3]
       *
       * _.drop([1, 2, 3], 5);
       * // => []
       *
       * _.drop([1, 2, 3], 0);
       * // => [1, 2, 3]
       */
      function drop(array, n, guard) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return [];
        }
        n = (guard || n === undefined) ? 1 : toInteger(n);
        return baseSlice(array, n < 0 ? 0 : n, length);
      }
  
      /**
       * Creates a slice of `array` with `n` elements dropped from the end.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {number} [n=1] The number of elements to drop.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * _.dropRight([1, 2, 3]);
       * // => [1, 2]
       *
       * _.dropRight([1, 2, 3], 2);
       * // => [1]
       *
       * _.dropRight([1, 2, 3], 5);
       * // => []
       *
       * _.dropRight([1, 2, 3], 0);
       * // => [1, 2, 3]
       */
      function dropRight(array, n, guard) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return [];
        }
        n = (guard || n === undefined) ? 1 : toInteger(n);
        n = length - n;
        return baseSlice(array, 0, n < 0 ? 0 : n);
      }
  
      /**
       * Creates a slice of `array` excluding elements dropped from the end.
       * Elements are dropped until `predicate` returns falsey. The predicate is
       * invoked with three arguments: (value, index, array).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'active': true },
       *   { 'user': 'fred',    'active': false },
       *   { 'user': 'pebbles', 'active': false }
       * ];
       *
       * _.dropRightWhile(users, function(o) { return !o.active; });
       * // => objects for ['barney']
       *
       * // The `_.matches` iteratee shorthand.
       * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
       * // => objects for ['barney', 'fred']
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.dropRightWhile(users, ['active', false]);
       * // => objects for ['barney']
       *
       * // The `_.property` iteratee shorthand.
       * _.dropRightWhile(users, 'active');
       * // => objects for ['barney', 'fred', 'pebbles']
       */
      function dropRightWhile(array, predicate) {
        return (array && array.length)
          ? baseWhile(array, getIteratee(predicate, 3), true, true)
          : [];
      }
  
      /**
       * Creates a slice of `array` excluding elements dropped from the beginning.
       * Elements are dropped until `predicate` returns falsey. The predicate is
       * invoked with three arguments: (value, index, array).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'active': false },
       *   { 'user': 'fred',    'active': false },
       *   { 'user': 'pebbles', 'active': true }
       * ];
       *
       * _.dropWhile(users, function(o) { return !o.active; });
       * // => objects for ['pebbles']
       *
       * // The `_.matches` iteratee shorthand.
       * _.dropWhile(users, { 'user': 'barney', 'active': false });
       * // => objects for ['fred', 'pebbles']
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.dropWhile(users, ['active', false]);
       * // => objects for ['pebbles']
       *
       * // The `_.property` iteratee shorthand.
       * _.dropWhile(users, 'active');
       * // => objects for ['barney', 'fred', 'pebbles']
       */
      function dropWhile(array, predicate) {
        return (array && array.length)
          ? baseWhile(array, getIteratee(predicate, 3), true)
          : [];
      }
  
      /**
       * Fills elements of `array` with `value` from `start` up to, but not
       * including, `end`.
       *
       * **Note:** This method mutates `array`.
       *
       * @static
       * @memberOf _
       * @since 3.2.0
       * @category Array
       * @param {Array} array The array to fill.
       * @param {*} value The value to fill `array` with.
       * @param {number} [start=0] The start position.
       * @param {number} [end=array.length] The end position.
       * @returns {Array} Returns `array`.
       * @example
       *
       * var array = [1, 2, 3];
       *
       * _.fill(array, 'a');
       * console.log(array);
       * // => ['a', 'a', 'a']
       *
       * _.fill(Array(3), 2);
       * // => [2, 2, 2]
       *
       * _.fill([4, 6, 8, 10], '*', 1, 3);
       * // => [4, '*', '*', 10]
       */
      function fill(array, value, start, end) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return [];
        }
        if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
          start = 0;
          end = length;
        }
        return baseFill(array, value, start, end);
      }
  
      /**
       * This method is like `_.find` except that it returns the index of the first
       * element `predicate` returns truthy for instead of the element itself.
       *
       * @static
       * @memberOf _
       * @since 1.1.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @param {number} [fromIndex=0] The index to search from.
       * @returns {number} Returns the index of the found element, else `-1`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'active': false },
       *   { 'user': 'fred',    'active': false },
       *   { 'user': 'pebbles', 'active': true }
       * ];
       *
       * _.findIndex(users, function(o) { return o.user == 'barney'; });
       * // => 0
       *
       * // The `_.matches` iteratee shorthand.
       * _.findIndex(users, { 'user': 'fred', 'active': false });
       * // => 1
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.findIndex(users, ['active', false]);
       * // => 0
       *
       * // The `_.property` iteratee shorthand.
       * _.findIndex(users, 'active');
       * // => 2
       */
      function findIndex(array, predicate, fromIndex) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return -1;
        }
        var index = fromIndex == null ? 0 : toInteger(fromIndex);
        if (index < 0) {
          index = nativeMax(length + index, 0);
        }
        return baseFindIndex(array, getIteratee(predicate, 3), index);
      }
  
      /**
       * This method is like `_.findIndex` except that it iterates over elements
       * of `collection` from right to left.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @param {number} [fromIndex=array.length-1] The index to search from.
       * @returns {number} Returns the index of the found element, else `-1`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'active': true },
       *   { 'user': 'fred',    'active': false },
       *   { 'user': 'pebbles', 'active': false }
       * ];
       *
       * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
       * // => 2
       *
       * // The `_.matches` iteratee shorthand.
       * _.findLastIndex(users, { 'user': 'barney', 'active': true });
       * // => 0
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.findLastIndex(users, ['active', false]);
       * // => 2
       *
       * // The `_.property` iteratee shorthand.
       * _.findLastIndex(users, 'active');
       * // => 0
       */
      function findLastIndex(array, predicate, fromIndex) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return -1;
        }
        var index = length - 1;
        if (fromIndex !== undefined) {
          index = toInteger(fromIndex);
          index = fromIndex < 0
            ? nativeMax(length + index, 0)
            : nativeMin(index, length - 1);
        }
        return baseFindIndex(array, getIteratee(predicate, 3), index, true);
      }
  
      /**
       * Flattens `array` a single level deep.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to flatten.
       * @returns {Array} Returns the new flattened array.
       * @example
       *
       * _.flatten([1, [2, [3, [4]], 5]]);
       * // => [1, 2, [3, [4]], 5]
       */
      function flatten(array) {
        var length = array == null ? 0 : array.length;
        return length ? baseFlatten(array, 1) : [];
      }
  
      /**
       * Recursively flattens `array`.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to flatten.
       * @returns {Array} Returns the new flattened array.
       * @example
       *
       * _.flattenDeep([1, [2, [3, [4]], 5]]);
       * // => [1, 2, 3, 4, 5]
       */
      function flattenDeep(array) {
        var length = array == null ? 0 : array.length;
        return length ? baseFlatten(array, INFINITY) : [];
      }
  
      /**
       * Recursively flatten `array` up to `depth` times.
       *
       * @static
       * @memberOf _
       * @since 4.4.0
       * @category Array
       * @param {Array} array The array to flatten.
       * @param {number} [depth=1] The maximum recursion depth.
       * @returns {Array} Returns the new flattened array.
       * @example
       *
       * var array = [1, [2, [3, [4]], 5]];
       *
       * _.flattenDepth(array, 1);
       * // => [1, 2, [3, [4]], 5]
       *
       * _.flattenDepth(array, 2);
       * // => [1, 2, 3, [4], 5]
       */
      function flattenDepth(array, depth) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return [];
        }
        depth = depth === undefined ? 1 : toInteger(depth);
        return baseFlatten(array, depth);
      }
  
      /**
       * The inverse of `_.toPairs`; this method returns an object composed
       * from key-value `pairs`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} pairs The key-value pairs.
       * @returns {Object} Returns the new object.
       * @example
       *
       * _.fromPairs([['a', 1], ['b', 2]]);
       * // => { 'a': 1, 'b': 2 }
       */
      function fromPairs(pairs) {
        var index = -1,
            length = pairs == null ? 0 : pairs.length,
            result = {};
  
        while (++index < length) {
          var pair = pairs[index];
          result[pair[0]] = pair[1];
        }
        return result;
      }
  
      /**
       * Gets the first element of `array`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @alias first
       * @category Array
       * @param {Array} array The array to query.
       * @returns {*} Returns the first element of `array`.
       * @example
       *
       * _.head([1, 2, 3]);
       * // => 1
       *
       * _.head([]);
       * // => undefined
       */
      function head(array) {
        return (array && array.length) ? array[0] : undefined;
      }
  
      /**
       * Gets the index at which the first occurrence of `value` is found in `array`
       * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons. If `fromIndex` is negative, it's used as the
       * offset from the end of `array`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {*} value The value to search for.
       * @param {number} [fromIndex=0] The index to search from.
       * @returns {number} Returns the index of the matched value, else `-1`.
       * @example
       *
       * _.indexOf([1, 2, 1, 2], 2);
       * // => 1
       *
       * // Search from the `fromIndex`.
       * _.indexOf([1, 2, 1, 2], 2, 2);
       * // => 3
       */
      function indexOf(array, value, fromIndex) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return -1;
        }
        var index = fromIndex == null ? 0 : toInteger(fromIndex);
        if (index < 0) {
          index = nativeMax(length + index, 0);
        }
        return baseIndexOf(array, value, index);
      }
  
      /**
       * Gets all but the last element of `array`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to query.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * _.initial([1, 2, 3]);
       * // => [1, 2]
       */
      function initial(array) {
        var length = array == null ? 0 : array.length;
        return length ? baseSlice(array, 0, -1) : [];
      }
  
      /**
       * Creates an array of unique values that are included in all given arrays
       * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons. The order and references of result values are
       * determined by the first array.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @returns {Array} Returns the new array of intersecting values.
       * @example
       *
       * _.intersection([2, 1], [2, 3]);
       * // => [2]
       */
      var intersection = baseRest(function(arrays) {
        var mapped = arrayMap(arrays, castArrayLikeObject);
        return (mapped.length && mapped[0] === arrays[0])
          ? baseIntersection(mapped)
          : [];
      });
  
      /**
       * This method is like `_.intersection` except that it accepts `iteratee`
       * which is invoked for each element of each `arrays` to generate the criterion
       * by which they're compared. The order and references of result values are
       * determined by the first array. The iteratee is invoked with one argument:
       * (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Array} Returns the new array of intersecting values.
       * @example
       *
       * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
       * // => [2.1]
       *
       * // The `_.property` iteratee shorthand.
       * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
       * // => [{ 'x': 1 }]
       */
      var intersectionBy = baseRest(function(arrays) {
        var iteratee = last(arrays),
            mapped = arrayMap(arrays, castArrayLikeObject);
  
        if (iteratee === last(mapped)) {
          iteratee = undefined;
        } else {
          mapped.pop();
        }
        return (mapped.length && mapped[0] === arrays[0])
          ? baseIntersection(mapped, getIteratee(iteratee, 2))
          : [];
      });
  
      /**
       * This method is like `_.intersection` except that it accepts `comparator`
       * which is invoked to compare elements of `arrays`. The order and references
       * of result values are determined by the first array. The comparator is
       * invoked with two arguments: (arrVal, othVal).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of intersecting values.
       * @example
       *
       * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
       * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
       *
       * _.intersectionWith(objects, others, _.isEqual);
       * // => [{ 'x': 1, 'y': 2 }]
       */
      var intersectionWith = baseRest(function(arrays) {
        var comparator = last(arrays),
            mapped = arrayMap(arrays, castArrayLikeObject);
  
        comparator = typeof comparator == 'function' ? comparator : undefined;
        if (comparator) {
          mapped.pop();
        }
        return (mapped.length && mapped[0] === arrays[0])
          ? baseIntersection(mapped, undefined, comparator)
          : [];
      });
  
      /**
       * Converts all elements in `array` into a string separated by `separator`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to convert.
       * @param {string} [separator=','] The element separator.
       * @returns {string} Returns the joined string.
       * @example
       *
       * _.join(['a', 'b', 'c'], '~');
       * // => 'a~b~c'
       */
      function join(array, separator) {
        return array == null ? '' : nativeJoin.call(array, separator);
      }
  
      /**
       * Gets the last element of `array`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to query.
       * @returns {*} Returns the last element of `array`.
       * @example
       *
       * _.last([1, 2, 3]);
       * // => 3
       */
      function last(array) {
        var length = array == null ? 0 : array.length;
        return length ? array[length - 1] : undefined;
      }
  
      /**
       * This method is like `_.indexOf` except that it iterates over elements of
       * `array` from right to left.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {*} value The value to search for.
       * @param {number} [fromIndex=array.length-1] The index to search from.
       * @returns {number} Returns the index of the matched value, else `-1`.
       * @example
       *
       * _.lastIndexOf([1, 2, 1, 2], 2);
       * // => 3
       *
       * // Search from the `fromIndex`.
       * _.lastIndexOf([1, 2, 1, 2], 2, 2);
       * // => 1
       */
      function lastIndexOf(array, value, fromIndex) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return -1;
        }
        var index = length;
        if (fromIndex !== undefined) {
          index = toInteger(fromIndex);
          index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);
        }
        return value === value
          ? strictLastIndexOf(array, value, index)
          : baseFindIndex(array, baseIsNaN, index, true);
      }
  
      /**
       * Gets the element at index `n` of `array`. If `n` is negative, the nth
       * element from the end is returned.
       *
       * @static
       * @memberOf _
       * @since 4.11.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {number} [n=0] The index of the element to return.
       * @returns {*} Returns the nth element of `array`.
       * @example
       *
       * var array = ['a', 'b', 'c', 'd'];
       *
       * _.nth(array, 1);
       * // => 'b'
       *
       * _.nth(array, -2);
       * // => 'c';
       */
      function nth(array, n) {
        return (array && array.length) ? baseNth(array, toInteger(n)) : undefined;
      }
  
      /**
       * Removes all given values from `array` using
       * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons.
       *
       * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
       * to remove elements from an array by predicate.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Array
       * @param {Array} array The array to modify.
       * @param {...*} [values] The values to remove.
       * @returns {Array} Returns `array`.
       * @example
       *
       * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
       *
       * _.pull(array, 'a', 'c');
       * console.log(array);
       * // => ['b', 'b']
       */
      var pull = baseRest(pullAll);
  
      /**
       * This method is like `_.pull` except that it accepts an array of values to remove.
       *
       * **Note:** Unlike `_.difference`, this method mutates `array`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to modify.
       * @param {Array} values The values to remove.
       * @returns {Array} Returns `array`.
       * @example
       *
       * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
       *
       * _.pullAll(array, ['a', 'c']);
       * console.log(array);
       * // => ['b', 'b']
       */
      function pullAll(array, values) {
        return (array && array.length && values && values.length)
          ? basePullAll(array, values)
          : array;
      }
  
      /**
       * This method is like `_.pullAll` except that it accepts `iteratee` which is
       * invoked for each element of `array` and `values` to generate the criterion
       * by which they're compared. The iteratee is invoked with one argument: (value).
       *
       * **Note:** Unlike `_.differenceBy`, this method mutates `array`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to modify.
       * @param {Array} values The values to remove.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Array} Returns `array`.
       * @example
       *
       * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];
       *
       * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');
       * console.log(array);
       * // => [{ 'x': 2 }]
       */
      function pullAllBy(array, values, iteratee) {
        return (array && array.length && values && values.length)
          ? basePullAll(array, values, getIteratee(iteratee, 2))
          : array;
      }
  
      /**
       * This method is like `_.pullAll` except that it accepts `comparator` which
       * is invoked to compare elements of `array` to `values`. The comparator is
       * invoked with two arguments: (arrVal, othVal).
       *
       * **Note:** Unlike `_.differenceWith`, this method mutates `array`.
       *
       * @static
       * @memberOf _
       * @since 4.6.0
       * @category Array
       * @param {Array} array The array to modify.
       * @param {Array} values The values to remove.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns `array`.
       * @example
       *
       * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];
       *
       * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);
       * console.log(array);
       * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]
       */
      function pullAllWith(array, values, comparator) {
        return (array && array.length && values && values.length)
          ? basePullAll(array, values, undefined, comparator)
          : array;
      }
  
      /**
       * Removes elements from `array` corresponding to `indexes` and returns an
       * array of removed elements.
       *
       * **Note:** Unlike `_.at`, this method mutates `array`.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to modify.
       * @param {...(number|number[])} [indexes] The indexes of elements to remove.
       * @returns {Array} Returns the new array of removed elements.
       * @example
       *
       * var array = ['a', 'b', 'c', 'd'];
       * var pulled = _.pullAt(array, [1, 3]);
       *
       * console.log(array);
       * // => ['a', 'c']
       *
       * console.log(pulled);
       * // => ['b', 'd']
       */
      var pullAt = flatRest(function(array, indexes) {
        var length = array == null ? 0 : array.length,
            result = baseAt(array, indexes);
  
        basePullAt(array, arrayMap(indexes, function(index) {
          return isIndex(index, length) ? +index : index;
        }).sort(compareAscending));
  
        return result;
      });
  
      /**
       * Removes all elements from `array` that `predicate` returns truthy for
       * and returns an array of the removed elements. The predicate is invoked
       * with three arguments: (value, index, array).
       *
       * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`
       * to pull elements from an array by value.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Array
       * @param {Array} array The array to modify.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the new array of removed elements.
       * @example
       *
       * var array = [1, 2, 3, 4];
       * var evens = _.remove(array, function(n) {
       *   return n % 2 == 0;
       * });
       *
       * console.log(array);
       * // => [1, 3]
       *
       * console.log(evens);
       * // => [2, 4]
       */
      function remove(array, predicate) {
        var result = [];
        if (!(array && array.length)) {
          return result;
        }
        var index = -1,
            indexes = [],
            length = array.length;
  
        predicate = getIteratee(predicate, 3);
        while (++index < length) {
          var value = array[index];
          if (predicate(value, index, array)) {
            result.push(value);
            indexes.push(index);
          }
        }
        basePullAt(array, indexes);
        return result;
      }
  
      /**
       * Reverses `array` so that the first element becomes the last, the second
       * element becomes the second to last, and so on.
       *
       * **Note:** This method mutates `array` and is based on
       * [`Array#reverse`](https://mdn.io/Array/reverse).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to modify.
       * @returns {Array} Returns `array`.
       * @example
       *
       * var array = [1, 2, 3];
       *
       * _.reverse(array);
       * // => [3, 2, 1]
       *
       * console.log(array);
       * // => [3, 2, 1]
       */
      function reverse(array) {
        return array == null ? array : nativeReverse.call(array);
      }
  
      /**
       * Creates a slice of `array` from `start` up to, but not including, `end`.
       *
       * **Note:** This method is used instead of
       * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are
       * returned.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to slice.
       * @param {number} [start=0] The start position.
       * @param {number} [end=array.length] The end position.
       * @returns {Array} Returns the slice of `array`.
       */
      function slice(array, start, end) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return [];
        }
        if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {
          start = 0;
          end = length;
        }
        else {
          start = start == null ? 0 : toInteger(start);
          end = end === undefined ? length : toInteger(end);
        }
        return baseSlice(array, start, end);
      }
  
      /**
       * Uses a binary search to determine the lowest index at which `value`
       * should be inserted into `array` in order to maintain its sort order.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The sorted array to inspect.
       * @param {*} value The value to evaluate.
       * @returns {number} Returns the index at which `value` should be inserted
       *  into `array`.
       * @example
       *
       * _.sortedIndex([30, 50], 40);
       * // => 1
       */
      function sortedIndex(array, value) {
        return baseSortedIndex(array, value);
      }
  
      /**
       * This method is like `_.sortedIndex` except that it accepts `iteratee`
       * which is invoked for `value` and each element of `array` to compute their
       * sort ranking. The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The sorted array to inspect.
       * @param {*} value The value to evaluate.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {number} Returns the index at which `value` should be inserted
       *  into `array`.
       * @example
       *
       * var objects = [{ 'x': 4 }, { 'x': 5 }];
       *
       * _.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
       * // => 0
       *
       * // The `_.property` iteratee shorthand.
       * _.sortedIndexBy(objects, { 'x': 4 }, 'x');
       * // => 0
       */
      function sortedIndexBy(array, value, iteratee) {
        return baseSortedIndexBy(array, value, getIteratee(iteratee, 2));
      }
  
      /**
       * This method is like `_.indexOf` except that it performs a binary
       * search on a sorted `array`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {*} value The value to search for.
       * @returns {number} Returns the index of the matched value, else `-1`.
       * @example
       *
       * _.sortedIndexOf([4, 5, 5, 5, 6], 5);
       * // => 1
       */
      function sortedIndexOf(array, value) {
        var length = array == null ? 0 : array.length;
        if (length) {
          var index = baseSortedIndex(array, value);
          if (index < length && eq(array[index], value)) {
            return index;
          }
        }
        return -1;
      }
  
      /**
       * This method is like `_.sortedIndex` except that it returns the highest
       * index at which `value` should be inserted into `array` in order to
       * maintain its sort order.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The sorted array to inspect.
       * @param {*} value The value to evaluate.
       * @returns {number} Returns the index at which `value` should be inserted
       *  into `array`.
       * @example
       *
       * _.sortedLastIndex([4, 5, 5, 5, 6], 5);
       * // => 4
       */
      function sortedLastIndex(array, value) {
        return baseSortedIndex(array, value, true);
      }
  
      /**
       * This method is like `_.sortedLastIndex` except that it accepts `iteratee`
       * which is invoked for `value` and each element of `array` to compute their
       * sort ranking. The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The sorted array to inspect.
       * @param {*} value The value to evaluate.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {number} Returns the index at which `value` should be inserted
       *  into `array`.
       * @example
       *
       * var objects = [{ 'x': 4 }, { 'x': 5 }];
       *
       * _.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
       * // => 1
       *
       * // The `_.property` iteratee shorthand.
       * _.sortedLastIndexBy(objects, { 'x': 4 }, 'x');
       * // => 1
       */
      function sortedLastIndexBy(array, value, iteratee) {
        return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true);
      }
  
      /**
       * This method is like `_.lastIndexOf` except that it performs a binary
       * search on a sorted `array`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {*} value The value to search for.
       * @returns {number} Returns the index of the matched value, else `-1`.
       * @example
       *
       * _.sortedLastIndexOf([4, 5, 5, 5, 6], 5);
       * // => 3
       */
      function sortedLastIndexOf(array, value) {
        var length = array == null ? 0 : array.length;
        if (length) {
          var index = baseSortedIndex(array, value, true) - 1;
          if (eq(array[index], value)) {
            return index;
          }
        }
        return -1;
      }
  
      /**
       * This method is like `_.uniq` except that it's designed and optimized
       * for sorted arrays.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @returns {Array} Returns the new duplicate free array.
       * @example
       *
       * _.sortedUniq([1, 1, 2]);
       * // => [1, 2]
       */
      function sortedUniq(array) {
        return (array && array.length)
          ? baseSortedUniq(array)
          : [];
      }
  
      /**
       * This method is like `_.uniqBy` except that it's designed and optimized
       * for sorted arrays.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @returns {Array} Returns the new duplicate free array.
       * @example
       *
       * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
       * // => [1.1, 2.3]
       */
      function sortedUniqBy(array, iteratee) {
        return (array && array.length)
          ? baseSortedUniq(array, getIteratee(iteratee, 2))
          : [];
      }
  
      /**
       * Gets all but the first element of `array`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * _.tail([1, 2, 3]);
       * // => [2, 3]
       */
      function tail(array) {
        var length = array == null ? 0 : array.length;
        return length ? baseSlice(array, 1, length) : [];
      }
  
      /**
       * Creates a slice of `array` with `n` elements taken from the beginning.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {number} [n=1] The number of elements to take.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * _.take([1, 2, 3]);
       * // => [1]
       *
       * _.take([1, 2, 3], 2);
       * // => [1, 2]
       *
       * _.take([1, 2, 3], 5);
       * // => [1, 2, 3]
       *
       * _.take([1, 2, 3], 0);
       * // => []
       */
      function take(array, n, guard) {
        if (!(array && array.length)) {
          return [];
        }
        n = (guard || n === undefined) ? 1 : toInteger(n);
        return baseSlice(array, 0, n < 0 ? 0 : n);
      }
  
      /**
       * Creates a slice of `array` with `n` elements taken from the end.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {number} [n=1] The number of elements to take.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * _.takeRight([1, 2, 3]);
       * // => [3]
       *
       * _.takeRight([1, 2, 3], 2);
       * // => [2, 3]
       *
       * _.takeRight([1, 2, 3], 5);
       * // => [1, 2, 3]
       *
       * _.takeRight([1, 2, 3], 0);
       * // => []
       */
      function takeRight(array, n, guard) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return [];
        }
        n = (guard || n === undefined) ? 1 : toInteger(n);
        n = length - n;
        return baseSlice(array, n < 0 ? 0 : n, length);
      }
  
      /**
       * Creates a slice of `array` with elements taken from the end. Elements are
       * taken until `predicate` returns falsey. The predicate is invoked with
       * three arguments: (value, index, array).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'active': true },
       *   { 'user': 'fred',    'active': false },
       *   { 'user': 'pebbles', 'active': false }
       * ];
       *
       * _.takeRightWhile(users, function(o) { return !o.active; });
       * // => objects for ['fred', 'pebbles']
       *
       * // The `_.matches` iteratee shorthand.
       * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
       * // => objects for ['pebbles']
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.takeRightWhile(users, ['active', false]);
       * // => objects for ['fred', 'pebbles']
       *
       * // The `_.property` iteratee shorthand.
       * _.takeRightWhile(users, 'active');
       * // => []
       */
      function takeRightWhile(array, predicate) {
        return (array && array.length)
          ? baseWhile(array, getIteratee(predicate, 3), false, true)
          : [];
      }
  
      /**
       * Creates a slice of `array` with elements taken from the beginning. Elements
       * are taken until `predicate` returns falsey. The predicate is invoked with
       * three arguments: (value, index, array).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'active': false },
       *   { 'user': 'fred',    'active': false },
       *   { 'user': 'pebbles', 'active': true }
       * ];
       *
       * _.takeWhile(users, function(o) { return !o.active; });
       * // => objects for ['barney', 'fred']
       *
       * // The `_.matches` iteratee shorthand.
       * _.takeWhile(users, { 'user': 'barney', 'active': false });
       * // => objects for ['barney']
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.takeWhile(users, ['active', false]);
       * // => objects for ['barney', 'fred']
       *
       * // The `_.property` iteratee shorthand.
       * _.takeWhile(users, 'active');
       * // => []
       */
      function takeWhile(array, predicate) {
        return (array && array.length)
          ? baseWhile(array, getIteratee(predicate, 3))
          : [];
      }
  
      /**
       * Creates an array of unique values, in order, from all given arrays using
       * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @returns {Array} Returns the new array of combined values.
       * @example
       *
       * _.union([2], [1, 2]);
       * // => [2, 1]
       */
      var union = baseRest(function(arrays) {
        return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));
      });
  
      /**
       * This method is like `_.union` except that it accepts `iteratee` which is
       * invoked for each element of each `arrays` to generate the criterion by
       * which uniqueness is computed. Result values are chosen from the first
       * array in which the value occurs. The iteratee is invoked with one argument:
       * (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Array} Returns the new array of combined values.
       * @example
       *
       * _.unionBy([2.1], [1.2, 2.3], Math.floor);
       * // => [2.1, 1.2]
       *
       * // The `_.property` iteratee shorthand.
       * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
       * // => [{ 'x': 1 }, { 'x': 2 }]
       */
      var unionBy = baseRest(function(arrays) {
        var iteratee = last(arrays);
        if (isArrayLikeObject(iteratee)) {
          iteratee = undefined;
        }
        return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2));
      });
  
      /**
       * This method is like `_.union` except that it accepts `comparator` which
       * is invoked to compare elements of `arrays`. Result values are chosen from
       * the first array in which the value occurs. The comparator is invoked
       * with two arguments: (arrVal, othVal).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of combined values.
       * @example
       *
       * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
       * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
       *
       * _.unionWith(objects, others, _.isEqual);
       * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
       */
      var unionWith = baseRest(function(arrays) {
        var comparator = last(arrays);
        comparator = typeof comparator == 'function' ? comparator : undefined;
        return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
      });
  
      /**
       * Creates a duplicate-free version of an array, using
       * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons, in which only the first occurrence of each element
       * is kept. The order of result values is determined by the order they occur
       * in the array.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @returns {Array} Returns the new duplicate free array.
       * @example
       *
       * _.uniq([2, 1, 2]);
       * // => [2, 1]
       */
      function uniq(array) {
        return (array && array.length) ? baseUniq(array) : [];
      }
  
      /**
       * This method is like `_.uniq` except that it accepts `iteratee` which is
       * invoked for each element in `array` to generate the criterion by which
       * uniqueness is computed. The order of result values is determined by the
       * order they occur in the array. The iteratee is invoked with one argument:
       * (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Array} Returns the new duplicate free array.
       * @example
       *
       * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
       * // => [2.1, 1.2]
       *
       * // The `_.property` iteratee shorthand.
       * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
       * // => [{ 'x': 1 }, { 'x': 2 }]
       */
      function uniqBy(array, iteratee) {
        return (array && array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : [];
      }
  
      /**
       * This method is like `_.uniq` except that it accepts `comparator` which
       * is invoked to compare elements of `array`. The order of result values is
       * determined by the order they occur in the array.The comparator is invoked
       * with two arguments: (arrVal, othVal).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new duplicate free array.
       * @example
       *
       * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];
       *
       * _.uniqWith(objects, _.isEqual);
       * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]
       */
      function uniqWith(array, comparator) {
        comparator = typeof comparator == 'function' ? comparator : undefined;
        return (array && array.length) ? baseUniq(array, undefined, comparator) : [];
      }
  
      /**
       * This method is like `_.zip` except that it accepts an array of grouped
       * elements and creates an array regrouping the elements to their pre-zip
       * configuration.
       *
       * @static
       * @memberOf _
       * @since 1.2.0
       * @category Array
       * @param {Array} array The array of grouped elements to process.
       * @returns {Array} Returns the new array of regrouped elements.
       * @example
       *
       * var zipped = _.zip(['a', 'b'], [1, 2], [true, false]);
       * // => [['a', 1, true], ['b', 2, false]]
       *
       * _.unzip(zipped);
       * // => [['a', 'b'], [1, 2], [true, false]]
       */
      function unzip(array) {
        if (!(array && array.length)) {
          return [];
        }
        var length = 0;
        array = arrayFilter(array, function(group) {
          if (isArrayLikeObject(group)) {
            length = nativeMax(group.length, length);
            return true;
          }
        });
        return baseTimes(length, function(index) {
          return arrayMap(array, baseProperty(index));
        });
      }
  
      /**
       * This method is like `_.unzip` except that it accepts `iteratee` to specify
       * how regrouped values should be combined. The iteratee is invoked with the
       * elements of each group: (...group).
       *
       * @static
       * @memberOf _
       * @since 3.8.0
       * @category Array
       * @param {Array} array The array of grouped elements to process.
       * @param {Function} [iteratee=_.identity] The function to combine
       *  regrouped values.
       * @returns {Array} Returns the new array of regrouped elements.
       * @example
       *
       * var zipped = _.zip([1, 2], [10, 20], [100, 200]);
       * // => [[1, 10, 100], [2, 20, 200]]
       *
       * _.unzipWith(zipped, _.add);
       * // => [3, 30, 300]
       */
      function unzipWith(array, iteratee) {
        if (!(array && array.length)) {
          return [];
        }
        var result = unzip(array);
        if (iteratee == null) {
          return result;
        }
        return arrayMap(result, function(group) {
          return apply(iteratee, undefined, group);
        });
      }
  
      /**
       * Creates an array excluding all given values using
       * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons.
       *
       * **Note:** Unlike `_.pull`, this method returns a new array.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {...*} [values] The values to exclude.
       * @returns {Array} Returns the new array of filtered values.
       * @see _.difference, _.xor
       * @example
       *
       * _.without([2, 1, 2, 3], 1, 2);
       * // => [3]
       */
      var without = baseRest(function(array, values) {
        return isArrayLikeObject(array)
          ? baseDifference(array, values)
          : [];
      });
  
      /**
       * Creates an array of unique values that is the
       * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
       * of the given arrays. The order of result values is determined by the order
       * they occur in the arrays.
       *
       * @static
       * @memberOf _
       * @since 2.4.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @returns {Array} Returns the new array of filtered values.
       * @see _.difference, _.without
       * @example
       *
       * _.xor([2, 1], [2, 3]);
       * // => [1, 3]
       */
      var xor = baseRest(function(arrays) {
        return baseXor(arrayFilter(arrays, isArrayLikeObject));
      });
  
      /**
       * This method is like `_.xor` except that it accepts `iteratee` which is
       * invoked for each element of each `arrays` to generate the criterion by
       * which by which they're compared. The order of result values is determined
       * by the order they occur in the arrays. The iteratee is invoked with one
       * argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Array} Returns the new array of filtered values.
       * @example
       *
       * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
       * // => [1.2, 3.4]
       *
       * // The `_.property` iteratee shorthand.
       * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
       * // => [{ 'x': 2 }]
       */
      var xorBy = baseRest(function(arrays) {
        var iteratee = last(arrays);
        if (isArrayLikeObject(iteratee)) {
          iteratee = undefined;
        }
        return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2));
      });
  
      /**
       * This method is like `_.xor` except that it accepts `comparator` which is
       * invoked to compare elements of `arrays`. The order of result values is
       * determined by the order they occur in the arrays. The comparator is invoked
       * with two arguments: (arrVal, othVal).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of filtered values.
       * @example
       *
       * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
       * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
       *
       * _.xorWith(objects, others, _.isEqual);
       * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
       */
      var xorWith = baseRest(function(arrays) {
        var comparator = last(arrays);
        comparator = typeof comparator == 'function' ? comparator : undefined;
        return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator);
      });
  
      /**
       * Creates an array of grouped elements, the first of which contains the
       * first elements of the given arrays, the second of which contains the
       * second elements of the given arrays, and so on.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {...Array} [arrays] The arrays to process.
       * @returns {Array} Returns the new array of grouped elements.
       * @example
       *
       * _.zip(['a', 'b'], [1, 2], [true, false]);
       * // => [['a', 1, true], ['b', 2, false]]
       */
      var zip = baseRest(unzip);
  
      /**
       * This method is like `_.fromPairs` except that it accepts two arrays,
       * one of property identifiers and one of corresponding values.
       *
       * @static
       * @memberOf _
       * @since 0.4.0
       * @category Array
       * @param {Array} [props=[]] The property identifiers.
       * @param {Array} [values=[]] The property values.
       * @returns {Object} Returns the new object.
       * @example
       *
       * _.zipObject(['a', 'b'], [1, 2]);
       * // => { 'a': 1, 'b': 2 }
       */
      function zipObject(props, values) {
        return baseZipObject(props || [], values || [], assignValue);
      }
  
      /**
       * This method is like `_.zipObject` except that it supports property paths.
       *
       * @static
       * @memberOf _
       * @since 4.1.0
       * @category Array
       * @param {Array} [props=[]] The property identifiers.
       * @param {Array} [values=[]] The property values.
       * @returns {Object} Returns the new object.
       * @example
       *
       * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);
       * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }
       */
      function zipObjectDeep(props, values) {
        return baseZipObject(props || [], values || [], baseSet);
      }
  
      /**
       * This method is like `_.zip` except that it accepts `iteratee` to specify
       * how grouped values should be combined. The iteratee is invoked with the
       * elements of each group: (...group).
       *
       * @static
       * @memberOf _
       * @since 3.8.0
       * @category Array
       * @param {...Array} [arrays] The arrays to process.
       * @param {Function} [iteratee=_.identity] The function to combine
       *  grouped values.
       * @returns {Array} Returns the new array of grouped elements.
       * @example
       *
       * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
       *   return a + b + c;
       * });
       * // => [111, 222]
       */
      var zipWith = baseRest(function(arrays) {
        var length = arrays.length,
            iteratee = length > 1 ? arrays[length - 1] : undefined;
  
        iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined;
        return unzipWith(arrays, iteratee);
      });
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates a `lodash` wrapper instance that wraps `value` with explicit method
       * chain sequences enabled. The result of such sequences must be unwrapped
       * with `_#value`.
       *
       * @static
       * @memberOf _
       * @since 1.3.0
       * @category Seq
       * @param {*} value The value to wrap.
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'age': 36 },
       *   { 'user': 'fred',    'age': 40 },
       *   { 'user': 'pebbles', 'age': 1 }
       * ];
       *
       * var youngest = _
       *   .chain(users)
       *   .sortBy('age')
       *   .map(function(o) {
       *     return o.user + ' is ' + o.age;
       *   })
       *   .head()
       *   .value();
       * // => 'pebbles is 1'
       */
      function chain(value) {
        var result = lodash(value);
        result.__chain__ = true;
        return result;
      }
  
      /**
       * This method invokes `interceptor` and returns `value`. The interceptor
       * is invoked with one argument; (value). The purpose of this method is to
       * "tap into" a method chain sequence in order to modify intermediate results.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Seq
       * @param {*} value The value to provide to `interceptor`.
       * @param {Function} interceptor The function to invoke.
       * @returns {*} Returns `value`.
       * @example
       *
       * _([1, 2, 3])
       *  .tap(function(array) {
       *    // Mutate input array.
       *    array.pop();
       *  })
       *  .reverse()
       *  .value();
       * // => [2, 1]
       */
      function tap(value, interceptor) {
        interceptor(value);
        return value;
      }
  
      /**
       * This method is like `_.tap` except that it returns the result of `interceptor`.
       * The purpose of this method is to "pass thru" values replacing intermediate
       * results in a method chain sequence.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Seq
       * @param {*} value The value to provide to `interceptor`.
       * @param {Function} interceptor The function to invoke.
       * @returns {*} Returns the result of `interceptor`.
       * @example
       *
       * _('  abc  ')
       *  .chain()
       *  .trim()
       *  .thru(function(value) {
       *    return [value];
       *  })
       *  .value();
       * // => ['abc']
       */
      function thru(value, interceptor) {
        return interceptor(value);
      }
  
      /**
       * This method is the wrapper version of `_.at`.
       *
       * @name at
       * @memberOf _
       * @since 1.0.0
       * @category Seq
       * @param {...(string|string[])} [paths] The property paths to pick.
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
       *
       * _(object).at(['a[0].b.c', 'a[1]']).value();
       * // => [3, 4]
       */
      var wrapperAt = flatRest(function(paths) {
        var length = paths.length,
            start = length ? paths[0] : 0,
            value = this.__wrapped__,
            interceptor = function(object) { return baseAt(object, paths); };
  
        if (length > 1 || this.__actions__.length ||
            !(value instanceof LazyWrapper) || !isIndex(start)) {
          return this.thru(interceptor);
        }
        value = value.slice(start, +start + (length ? 1 : 0));
        value.__actions__.push({
          'func': thru,
          'args': [interceptor],
          'thisArg': undefined
        });
        return new LodashWrapper(value, this.__chain__).thru(function(array) {
          if (length && !array.length) {
            array.push(undefined);
          }
          return array;
        });
      });
  
      /**
       * Creates a `lodash` wrapper instance with explicit method chain sequences enabled.
       *
       * @name chain
       * @memberOf _
       * @since 0.1.0
       * @category Seq
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * var users = [
       *   { 'user': 'barney', 'age': 36 },
       *   { 'user': 'fred',   'age': 40 }
       * ];
       *
       * // A sequence without explicit chaining.
       * _(users).head();
       * // => { 'user': 'barney', 'age': 36 }
       *
       * // A sequence with explicit chaining.
       * _(users)
       *   .chain()
       *   .head()
       *   .pick('user')
       *   .value();
       * // => { 'user': 'barney' }
       */
      function wrapperChain() {
        return chain(this);
      }
  
      /**
       * Executes the chain sequence and returns the wrapped result.
       *
       * @name commit
       * @memberOf _
       * @since 3.2.0
       * @category Seq
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * var array = [1, 2];
       * var wrapped = _(array).push(3);
       *
       * console.log(array);
       * // => [1, 2]
       *
       * wrapped = wrapped.commit();
       * console.log(array);
       * // => [1, 2, 3]
       *
       * wrapped.last();
       * // => 3
       *
       * console.log(array);
       * // => [1, 2, 3]
       */
      function wrapperCommit() {
        return new LodashWrapper(this.value(), this.__chain__);
      }
  
      /**
       * Gets the next value on a wrapped object following the
       * [iterator protocol](https://mdn.io/iteration_protocols#iterator).
       *
       * @name next
       * @memberOf _
       * @since 4.0.0
       * @category Seq
       * @returns {Object} Returns the next iterator value.
       * @example
       *
       * var wrapped = _([1, 2]);
       *
       * wrapped.next();
       * // => { 'done': false, 'value': 1 }
       *
       * wrapped.next();
       * // => { 'done': false, 'value': 2 }
       *
       * wrapped.next();
       * // => { 'done': true, 'value': undefined }
       */
      function wrapperNext() {
        if (this.__values__ === undefined) {
          this.__values__ = toArray(this.value());
        }
        var done = this.__index__ >= this.__values__.length,
            value = done ? undefined : this.__values__[this.__index__++];
  
        return { 'done': done, 'value': value };
      }
  
      /**
       * Enables the wrapper to be iterable.
       *
       * @name Symbol.iterator
       * @memberOf _
       * @since 4.0.0
       * @category Seq
       * @returns {Object} Returns the wrapper object.
       * @example
       *
       * var wrapped = _([1, 2]);
       *
       * wrapped[Symbol.iterator]() === wrapped;
       * // => true
       *
       * Array.from(wrapped);
       * // => [1, 2]
       */
      function wrapperToIterator() {
        return this;
      }
  
      /**
       * Creates a clone of the chain sequence planting `value` as the wrapped value.
       *
       * @name plant
       * @memberOf _
       * @since 3.2.0
       * @category Seq
       * @param {*} value The value to plant.
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * function square(n) {
       *   return n * n;
       * }
       *
       * var wrapped = _([1, 2]).map(square);
       * var other = wrapped.plant([3, 4]);
       *
       * other.value();
       * // => [9, 16]
       *
       * wrapped.value();
       * // => [1, 4]
       */
      function wrapperPlant(value) {
        var result,
            parent = this;
  
        while (parent instanceof baseLodash) {
          var clone = wrapperClone(parent);
          clone.__index__ = 0;
          clone.__values__ = undefined;
          if (result) {
            previous.__wrapped__ = clone;
          } else {
            result = clone;
          }
          var previous = clone;
          parent = parent.__wrapped__;
        }
        previous.__wrapped__ = value;
        return result;
      }
  
      /**
       * This method is the wrapper version of `_.reverse`.
       *
       * **Note:** This method mutates the wrapped array.
       *
       * @name reverse
       * @memberOf _
       * @since 0.1.0
       * @category Seq
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * var array = [1, 2, 3];
       *
       * _(array).reverse().value()
       * // => [3, 2, 1]
       *
       * console.log(array);
       * // => [3, 2, 1]
       */
      function wrapperReverse() {
        var value = this.__wrapped__;
        if (value instanceof LazyWrapper) {
          var wrapped = value;
          if (this.__actions__.length) {
            wrapped = new LazyWrapper(this);
          }
          wrapped = wrapped.reverse();
          wrapped.__actions__.push({
            'func': thru,
            'args': [reverse],
            'thisArg': undefined
          });
          return new LodashWrapper(wrapped, this.__chain__);
        }
        return this.thru(reverse);
      }
  
      /**
       * Executes the chain sequence to resolve the unwrapped value.
       *
       * @name value
       * @memberOf _
       * @since 0.1.0
       * @alias toJSON, valueOf
       * @category Seq
       * @returns {*} Returns the resolved unwrapped value.
       * @example
       *
       * _([1, 2, 3]).value();
       * // => [1, 2, 3]
       */
      function wrapperValue() {
        return baseWrapperValue(this.__wrapped__, this.__actions__);
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates an object composed of keys generated from the results of running
       * each element of `collection` thru `iteratee`. The corresponding value of
       * each key is the number of times the key was returned by `iteratee`. The
       * iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 0.5.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
       * @returns {Object} Returns the composed aggregate object.
       * @example
       *
       * _.countBy([6.1, 4.2, 6.3], Math.floor);
       * // => { '4': 1, '6': 2 }
       *
       * // The `_.property` iteratee shorthand.
       * _.countBy(['one', 'two', 'three'], 'length');
       * // => { '3': 2, '5': 1 }
       */
      var countBy = createAggregator(function(result, value, key) {
        if (hasOwnProperty.call(result, key)) {
          ++result[key];
        } else {
          baseAssignValue(result, key, 1);
        }
      });
  
      /**
       * Checks if `predicate` returns truthy for **all** elements of `collection`.
       * Iteration is stopped once `predicate` returns falsey. The predicate is
       * invoked with three arguments: (value, index|key, collection).
       *
       * **Note:** This method returns `true` for
       * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
       * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
       * elements of empty collections.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {boolean} Returns `true` if all elements pass the predicate check,
       *  else `false`.
       * @example
       *
       * _.every([true, 1, null, 'yes'], Boolean);
       * // => false
       *
       * var users = [
       *   { 'user': 'barney', 'age': 36, 'active': false },
       *   { 'user': 'fred',   'age': 40, 'active': false }
       * ];
       *
       * // The `_.matches` iteratee shorthand.
       * _.every(users, { 'user': 'barney', 'active': false });
       * // => false
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.every(users, ['active', false]);
       * // => true
       *
       * // The `_.property` iteratee shorthand.
       * _.every(users, 'active');
       * // => false
       */
      function every(collection, predicate, guard) {
        var func = isArray(collection) ? arrayEvery : baseEvery;
        if (guard && isIterateeCall(collection, predicate, guard)) {
          predicate = undefined;
        }
        return func(collection, getIteratee(predicate, 3));
      }
  
      /**
       * Iterates over elements of `collection`, returning an array of all elements
       * `predicate` returns truthy for. The predicate is invoked with three
       * arguments: (value, index|key, collection).
       *
       * **Note:** Unlike `_.remove`, this method returns a new array.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the new filtered array.
       * @see _.reject
       * @example
       *
       * var users = [
       *   { 'user': 'barney', 'age': 36, 'active': true },
       *   { 'user': 'fred',   'age': 40, 'active': false }
       * ];
       *
       * _.filter(users, function(o) { return !o.active; });
       * // => objects for ['fred']
       *
       * // The `_.matches` iteratee shorthand.
       * _.filter(users, { 'age': 36, 'active': true });
       * // => objects for ['barney']
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.filter(users, ['active', false]);
       * // => objects for ['fred']
       *
       * // The `_.property` iteratee shorthand.
       * _.filter(users, 'active');
       * // => objects for ['barney']
       */
      function filter(collection, predicate) {
        var func = isArray(collection) ? arrayFilter : baseFilter;
        return func(collection, getIteratee(predicate, 3));
      }
  
      /**
       * Iterates over elements of `collection`, returning the first element
       * `predicate` returns truthy for. The predicate is invoked with three
       * arguments: (value, index|key, collection).
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to inspect.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @param {number} [fromIndex=0] The index to search from.
       * @returns {*} Returns the matched element, else `undefined`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'age': 36, 'active': true },
       *   { 'user': 'fred',    'age': 40, 'active': false },
       *   { 'user': 'pebbles', 'age': 1,  'active': true }
       * ];
       *
       * _.find(users, function(o) { return o.age < 40; });
       * // => object for 'barney'
       *
       * // The `_.matches` iteratee shorthand.
       * _.find(users, { 'age': 1, 'active': true });
       * // => object for 'pebbles'
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.find(users, ['active', false]);
       * // => object for 'fred'
       *
       * // The `_.property` iteratee shorthand.
       * _.find(users, 'active');
       * // => object for 'barney'
       */
      var find = createFind(findIndex);
  
      /**
       * This method is like `_.find` except that it iterates over elements of
       * `collection` from right to left.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to inspect.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @param {number} [fromIndex=collection.length-1] The index to search from.
       * @returns {*} Returns the matched element, else `undefined`.
       * @example
       *
       * _.findLast([1, 2, 3, 4], function(n) {
       *   return n % 2 == 1;
       * });
       * // => 3
       */
      var findLast = createFind(findLastIndex);
  
      /**
       * Creates a flattened array of values by running each element in `collection`
       * thru `iteratee` and flattening the mapped results. The iteratee is invoked
       * with three arguments: (value, index|key, collection).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the new flattened array.
       * @example
       *
       * function duplicate(n) {
       *   return [n, n];
       * }
       *
       * _.flatMap([1, 2], duplicate);
       * // => [1, 1, 2, 2]
       */
      function flatMap(collection, iteratee) {
        return baseFlatten(map(collection, iteratee), 1);
      }
  
      /**
       * This method is like `_.flatMap` except that it recursively flattens the
       * mapped results.
       *
       * @static
       * @memberOf _
       * @since 4.7.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the new flattened array.
       * @example
       *
       * function duplicate(n) {
       *   return [[[n, n]]];
       * }
       *
       * _.flatMapDeep([1, 2], duplicate);
       * // => [1, 1, 2, 2]
       */
      function flatMapDeep(collection, iteratee) {
        return baseFlatten(map(collection, iteratee), INFINITY);
      }
  
      /**
       * This method is like `_.flatMap` except that it recursively flattens the
       * mapped results up to `depth` times.
       *
       * @static
       * @memberOf _
       * @since 4.7.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @param {number} [depth=1] The maximum recursion depth.
       * @returns {Array} Returns the new flattened array.
       * @example
       *
       * function duplicate(n) {
       *   return [[[n, n]]];
       * }
       *
       * _.flatMapDepth([1, 2], duplicate, 2);
       * // => [[1, 1], [2, 2]]
       */
      function flatMapDepth(collection, iteratee, depth) {
        depth = depth === undefined ? 1 : toInteger(depth);
        return baseFlatten(map(collection, iteratee), depth);
      }
  
      /**
       * Iterates over elements of `collection` and invokes `iteratee` for each element.
       * The iteratee is invoked with three arguments: (value, index|key, collection).
       * Iteratee functions may exit iteration early by explicitly returning `false`.
       *
       * **Note:** As with other "Collections" methods, objects with a "length"
       * property are iterated like arrays. To avoid this behavior use `_.forIn`
       * or `_.forOwn` for object iteration.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @alias each
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Array|Object} Returns `collection`.
       * @see _.forEachRight
       * @example
       *
       * _.forEach([1, 2], function(value) {
       *   console.log(value);
       * });
       * // => Logs `1` then `2`.
       *
       * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
       *   console.log(key);
       * });
       * // => Logs 'a' then 'b' (iteration order is not guaranteed).
       */
      function forEach(collection, iteratee) {
        var func = isArray(collection) ? arrayEach : baseEach;
        return func(collection, getIteratee(iteratee, 3));
      }
  
      /**
       * This method is like `_.forEach` except that it iterates over elements of
       * `collection` from right to left.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @alias eachRight
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Array|Object} Returns `collection`.
       * @see _.forEach
       * @example
       *
       * _.forEachRight([1, 2], function(value) {
       *   console.log(value);
       * });
       * // => Logs `2` then `1`.
       */
      function forEachRight(collection, iteratee) {
        var func = isArray(collection) ? arrayEachRight : baseEachRight;
        return func(collection, getIteratee(iteratee, 3));
      }
  
      /**
       * Creates an object composed of keys generated from the results of running
       * each element of `collection` thru `iteratee`. The order of grouped values
       * is determined by the order they occur in `collection`. The corresponding
       * value of each key is an array of elements responsible for generating the
       * key. The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
       * @returns {Object} Returns the composed aggregate object.
       * @example
       *
       * _.groupBy([6.1, 4.2, 6.3], Math.floor);
       * // => { '4': [4.2], '6': [6.1, 6.3] }
       *
       * // The `_.property` iteratee shorthand.
       * _.groupBy(['one', 'two', 'three'], 'length');
       * // => { '3': ['one', 'two'], '5': ['three'] }
       */
      var groupBy = createAggregator(function(result, value, key) {
        if (hasOwnProperty.call(result, key)) {
          result[key].push(value);
        } else {
          baseAssignValue(result, key, [value]);
        }
      });
  
      /**
       * Checks if `value` is in `collection`. If `collection` is a string, it's
       * checked for a substring of `value`, otherwise
       * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * is used for equality comparisons. If `fromIndex` is negative, it's used as
       * the offset from the end of `collection`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object|string} collection The collection to inspect.
       * @param {*} value The value to search for.
       * @param {number} [fromIndex=0] The index to search from.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
       * @returns {boolean} Returns `true` if `value` is found, else `false`.
       * @example
       *
       * _.includes([1, 2, 3], 1);
       * // => true
       *
       * _.includes([1, 2, 3], 1, 2);
       * // => false
       *
       * _.includes({ 'a': 1, 'b': 2 }, 1);
       * // => true
       *
       * _.includes('abcd', 'bc');
       * // => true
       */
      function includes(collection, value, fromIndex, guard) {
        collection = isArrayLike(collection) ? collection : values(collection);
        fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0;
  
        var length = collection.length;
        if (fromIndex < 0) {
          fromIndex = nativeMax(length + fromIndex, 0);
        }
        return isString(collection)
          ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1)
          : (!!length && baseIndexOf(collection, value, fromIndex) > -1);
      }
  
      /**
       * Invokes the method at `path` of each element in `collection`, returning
       * an array of the results of each invoked method. Any additional arguments
       * are provided to each invoked method. If `path` is a function, it's invoked
       * for, and `this` bound to, each element in `collection`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Array|Function|string} path The path of the method to invoke or
       *  the function invoked per iteration.
       * @param {...*} [args] The arguments to invoke each method with.
       * @returns {Array} Returns the array of results.
       * @example
       *
       * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
       * // => [[1, 5, 7], [1, 2, 3]]
       *
       * _.invokeMap([123, 456], String.prototype.split, '');
       * // => [['1', '2', '3'], ['4', '5', '6']]
       */
      var invokeMap = baseRest(function(collection, path, args) {
        var index = -1,
            isFunc = typeof path == 'function',
            result = isArrayLike(collection) ? Array(collection.length) : [];
  
        baseEach(collection, function(value) {
          result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
        });
        return result;
      });
  
      /**
       * Creates an object composed of keys generated from the results of running
       * each element of `collection` thru `iteratee`. The corresponding value of
       * each key is the last element responsible for generating the key. The
       * iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
       * @returns {Object} Returns the composed aggregate object.
       * @example
       *
       * var array = [
       *   { 'dir': 'left', 'code': 97 },
       *   { 'dir': 'right', 'code': 100 }
       * ];
       *
       * _.keyBy(array, function(o) {
       *   return String.fromCharCode(o.code);
       * });
       * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
       *
       * _.keyBy(array, 'dir');
       * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
       */
      var keyBy = createAggregator(function(result, value, key) {
        baseAssignValue(result, key, value);
      });
  
      /**
       * Creates an array of values by running each element in `collection` thru
       * `iteratee`. The iteratee is invoked with three arguments:
       * (value, index|key, collection).
       *
       * Many lodash methods are guarded to work as iteratees for methods like
       * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
       *
       * The guarded methods are:
       * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
       * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
       * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
       * `template`, `trim`, `trimEnd`, `trimStart`, and `words`
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the new mapped array.
       * @example
       *
       * function square(n) {
       *   return n * n;
       * }
       *
       * _.map([4, 8], square);
       * // => [16, 64]
       *
       * _.map({ 'a': 4, 'b': 8 }, square);
       * // => [16, 64] (iteration order is not guaranteed)
       *
       * var users = [
       *   { 'user': 'barney' },
       *   { 'user': 'fred' }
       * ];
       *
       * // The `_.property` iteratee shorthand.
       * _.map(users, 'user');
       * // => ['barney', 'fred']
       */
      function map(collection, iteratee) {
        var func = isArray(collection) ? arrayMap : baseMap;
        return func(collection, getIteratee(iteratee, 3));
      }
  
      /**
       * This method is like `_.sortBy` except that it allows specifying the sort
       * orders of the iteratees to sort by. If `orders` is unspecified, all values
       * are sorted in ascending order. Otherwise, specify an order of "desc" for
       * descending or "asc" for ascending sort order of corresponding values.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]]
       *  The iteratees to sort by.
       * @param {string[]} [orders] The sort orders of `iteratees`.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
       * @returns {Array} Returns the new sorted array.
       * @example
       *
       * var users = [
       *   { 'user': 'fred',   'age': 48 },
       *   { 'user': 'barney', 'age': 34 },
       *   { 'user': 'fred',   'age': 40 },
       *   { 'user': 'barney', 'age': 36 }
       * ];
       *
       * // Sort by `user` in ascending order and by `age` in descending order.
       * _.orderBy(users, ['user', 'age'], ['asc', 'desc']);
       * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
       */
      function orderBy(collection, iteratees, orders, guard) {
        if (collection == null) {
          return [];
        }
        if (!isArray(iteratees)) {
          iteratees = iteratees == null ? [] : [iteratees];
        }
        orders = guard ? undefined : orders;
        if (!isArray(orders)) {
          orders = orders == null ? [] : [orders];
        }
        return baseOrderBy(collection, iteratees, orders);
      }
  
      /**
       * Creates an array of elements split into two groups, the first of which
       * contains elements `predicate` returns truthy for, the second of which
       * contains elements `predicate` returns falsey for. The predicate is
       * invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the array of grouped elements.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'age': 36, 'active': false },
       *   { 'user': 'fred',    'age': 40, 'active': true },
       *   { 'user': 'pebbles', 'age': 1,  'active': false }
       * ];
       *
       * _.partition(users, function(o) { return o.active; });
       * // => objects for [['fred'], ['barney', 'pebbles']]
       *
       * // The `_.matches` iteratee shorthand.
       * _.partition(users, { 'age': 1, 'active': false });
       * // => objects for [['pebbles'], ['barney', 'fred']]
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.partition(users, ['active', false]);
       * // => objects for [['barney', 'pebbles'], ['fred']]
       *
       * // The `_.property` iteratee shorthand.
       * _.partition(users, 'active');
       * // => objects for [['fred'], ['barney', 'pebbles']]
       */
      var partition = createAggregator(function(result, value, key) {
        result[key ? 0 : 1].push(value);
      }, function() { return [[], []]; });
  
      /**
       * Reduces `collection` to a value which is the accumulated result of running
       * each element in `collection` thru `iteratee`, where each successive
       * invocation is supplied the return value of the previous. If `accumulator`
       * is not given, the first element of `collection` is used as the initial
       * value. The iteratee is invoked with four arguments:
       * (accumulator, value, index|key, collection).
       *
       * Many lodash methods are guarded to work as iteratees for methods like
       * `_.reduce`, `_.reduceRight`, and `_.transform`.
       *
       * The guarded methods are:
       * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,
       * and `sortBy`
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @param {*} [accumulator] The initial value.
       * @returns {*} Returns the accumulated value.
       * @see _.reduceRight
       * @example
       *
       * _.reduce([1, 2], function(sum, n) {
       *   return sum + n;
       * }, 0);
       * // => 3
       *
       * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
       *   (result[value] || (result[value] = [])).push(key);
       *   return result;
       * }, {});
       * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
       */
      function reduce(collection, iteratee, accumulator) {
        var func = isArray(collection) ? arrayReduce : baseReduce,
            initAccum = arguments.length < 3;
  
        return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach);
      }
  
      /**
       * This method is like `_.reduce` except that it iterates over elements of
       * `collection` from right to left.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @param {*} [accumulator] The initial value.
       * @returns {*} Returns the accumulated value.
       * @see _.reduce
       * @example
       *
       * var array = [[0, 1], [2, 3], [4, 5]];
       *
       * _.reduceRight(array, function(flattened, other) {
       *   return flattened.concat(other);
       * }, []);
       * // => [4, 5, 2, 3, 0, 1]
       */
      function reduceRight(collection, iteratee, accumulator) {
        var func = isArray(collection) ? arrayReduceRight : baseReduce,
            initAccum = arguments.length < 3;
  
        return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);
      }
  
      /**
       * The opposite of `_.filter`; this method returns the elements of `collection`
       * that `predicate` does **not** return truthy for.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the new filtered array.
       * @see _.filter
       * @example
       *
       * var users = [
       *   { 'user': 'barney', 'age': 36, 'active': false },
       *   { 'user': 'fred',   'age': 40, 'active': true }
       * ];
       *
       * _.reject(users, function(o) { return !o.active; });
       * // => objects for ['fred']
       *
       * // The `_.matches` iteratee shorthand.
       * _.reject(users, { 'age': 40, 'active': true });
       * // => objects for ['barney']
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.reject(users, ['active', false]);
       * // => objects for ['fred']
       *
       * // The `_.property` iteratee shorthand.
       * _.reject(users, 'active');
       * // => objects for ['barney']
       */
      function reject(collection, predicate) {
        var func = isArray(collection) ? arrayFilter : baseFilter;
        return func(collection, negate(getIteratee(predicate, 3)));
      }
  
      /**
       * Gets a random element from `collection`.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to sample.
       * @returns {*} Returns the random element.
       * @example
       *
       * _.sample([1, 2, 3, 4]);
       * // => 2
       */
      function sample(collection) {
        var func = isArray(collection) ? arraySample : baseSample;
        return func(collection);
      }
  
      /**
       * Gets `n` random elements at unique keys from `collection` up to the
       * size of `collection`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to sample.
       * @param {number} [n=1] The number of elements to sample.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the random elements.
       * @example
       *
       * _.sampleSize([1, 2, 3], 2);
       * // => [3, 1]
       *
       * _.sampleSize([1, 2, 3], 4);
       * // => [2, 3, 1]
       */
      function sampleSize(collection, n, guard) {
        if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {
          n = 1;
        } else {
          n = toInteger(n);
        }
        var func = isArray(collection) ? arraySampleSize : baseSampleSize;
        return func(collection, n);
      }
  
      /**
       * Creates an array of shuffled values, using a version of the
       * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to shuffle.
       * @returns {Array} Returns the new shuffled array.
       * @example
       *
       * _.shuffle([1, 2, 3, 4]);
       * // => [4, 1, 3, 2]
       */
      function shuffle(collection) {
        var func = isArray(collection) ? arrayShuffle : baseShuffle;
        return func(collection);
      }
  
      /**
       * Gets the size of `collection` by returning its length for array-like
       * values or the number of own enumerable string keyed properties for objects.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object|string} collection The collection to inspect.
       * @returns {number} Returns the collection size.
       * @example
       *
       * _.size([1, 2, 3]);
       * // => 3
       *
       * _.size({ 'a': 1, 'b': 2 });
       * // => 2
       *
       * _.size('pebbles');
       * // => 7
       */
      function size(collection) {
        if (collection == null) {
          return 0;
        }
        if (isArrayLike(collection)) {
          return isString(collection) ? stringSize(collection) : collection.length;
        }
        var tag = getTag(collection);
        if (tag == mapTag || tag == setTag) {
          return collection.size;
        }
        return baseKeys(collection).length;
      }
  
      /**
       * Checks if `predicate` returns truthy for **any** element of `collection`.
       * Iteration is stopped once `predicate` returns truthy. The predicate is
       * invoked with three arguments: (value, index|key, collection).
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {boolean} Returns `true` if any element passes the predicate check,
       *  else `false`.
       * @example
       *
       * _.some([null, 0, 'yes', false], Boolean);
       * // => true
       *
       * var users = [
       *   { 'user': 'barney', 'active': true },
       *   { 'user': 'fred',   'active': false }
       * ];
       *
       * // The `_.matches` iteratee shorthand.
       * _.some(users, { 'user': 'barney', 'active': false });
       * // => false
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.some(users, ['active', false]);
       * // => true
       *
       * // The `_.property` iteratee shorthand.
       * _.some(users, 'active');
       * // => true
       */
      function some(collection, predicate, guard) {
        var func = isArray(collection) ? arraySome : baseSome;
        if (guard && isIterateeCall(collection, predicate, guard)) {
          predicate = undefined;
        }
        return func(collection, getIteratee(predicate, 3));
      }
  
      /**
       * Creates an array of elements, sorted in ascending order by the results of
       * running each element in a collection thru each iteratee. This method
       * performs a stable sort, that is, it preserves the original sort order of
       * equal elements. The iteratees are invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {...(Function|Function[])} [iteratees=[_.identity]]
       *  The iteratees to sort by.
       * @returns {Array} Returns the new sorted array.
       * @example
       *
       * var users = [
       *   { 'user': 'fred',   'age': 48 },
       *   { 'user': 'barney', 'age': 36 },
       *   { 'user': 'fred',   'age': 40 },
       *   { 'user': 'barney', 'age': 34 }
       * ];
       *
       * _.sortBy(users, [function(o) { return o.user; }]);
       * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
       *
       * _.sortBy(users, ['user', 'age']);
       * // => objects for [['barney', 34], ['barney', 36], ['fred', 40], ['fred', 48]]
       */
      var sortBy = baseRest(function(collection, iteratees) {
        if (collection == null) {
          return [];
        }
        var length = iteratees.length;
        if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) {
          iteratees = [];
        } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {
          iteratees = [iteratees[0]];
        }
        return baseOrderBy(collection, baseFlatten(iteratees, 1), []);
      });
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Gets the timestamp of the number of milliseconds that have elapsed since
       * the Unix epoch (1 January 1970 00:00:00 UTC).
       *
       * @static
       * @memberOf _
       * @since 2.4.0
       * @category Date
       * @returns {number} Returns the timestamp.
       * @example
       *
       * _.defer(function(stamp) {
       *   console.log(_.now() - stamp);
       * }, _.now());
       * // => Logs the number of milliseconds it took for the deferred invocation.
       */
      var now = ctxNow || function() {
        return root.Date.now();
      };
  
      /*------------------------------------------------------------------------*/
  
      /**
       * The opposite of `_.before`; this method creates a function that invokes
       * `func` once it's called `n` or more times.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {number} n The number of calls before `func` is invoked.
       * @param {Function} func The function to restrict.
       * @returns {Function} Returns the new restricted function.
       * @example
       *
       * var saves = ['profile', 'settings'];
       *
       * var done = _.after(saves.length, function() {
       *   console.log('done saving!');
       * });
       *
       * _.forEach(saves, function(type) {
       *   asyncSave({ 'type': type, 'complete': done });
       * });
       * // => Logs 'done saving!' after the two async saves have completed.
       */
      function after(n, func) {
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        n = toInteger(n);
        return function() {
          if (--n < 1) {
            return func.apply(this, arguments);
          }
        };
      }
  
      /**
       * Creates a function that invokes `func`, with up to `n` arguments,
       * ignoring any additional arguments.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Function
       * @param {Function} func The function to cap arguments for.
       * @param {number} [n=func.length] The arity cap.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Function} Returns the new capped function.
       * @example
       *
       * _.map(['6', '8', '10'], _.ary(parseInt, 1));
       * // => [6, 8, 10]
       */
      function ary(func, n, guard) {
        n = guard ? undefined : n;
        n = (func && n == null) ? func.length : n;
        return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n);
      }
  
      /**
       * Creates a function that invokes `func`, with the `this` binding and arguments
       * of the created function, while it's called less than `n` times. Subsequent
       * calls to the created function return the result of the last `func` invocation.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Function
       * @param {number} n The number of calls at which `func` is no longer invoked.
       * @param {Function} func The function to restrict.
       * @returns {Function} Returns the new restricted function.
       * @example
       *
       * jQuery(element).on('click', _.before(5, addContactToList));
       * // => Allows adding up to 4 contacts to the list.
       */
      function before(n, func) {
        var result;
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        n = toInteger(n);
        return function() {
          if (--n > 0) {
            result = func.apply(this, arguments);
          }
          if (n <= 1) {
            func = undefined;
          }
          return result;
        };
      }
  
      /**
       * Creates a function that invokes `func` with the `this` binding of `thisArg`
       * and `partials` prepended to the arguments it receives.
       *
       * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
       * may be used as a placeholder for partially applied arguments.
       *
       * **Note:** Unlike native `Function#bind`, this method doesn't set the "length"
       * property of bound functions.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to bind.
       * @param {*} thisArg The `this` binding of `func`.
       * @param {...*} [partials] The arguments to be partially applied.
       * @returns {Function} Returns the new bound function.
       * @example
       *
       * function greet(greeting, punctuation) {
       *   return greeting + ' ' + this.user + punctuation;
       * }
       *
       * var object = { 'user': 'fred' };
       *
       * var bound = _.bind(greet, object, 'hi');
       * bound('!');
       * // => 'hi fred!'
       *
       * // Bound with placeholders.
       * var bound = _.bind(greet, object, _, '!');
       * bound('hi');
       * // => 'hi fred!'
       */
      var bind = baseRest(function(func, thisArg, partials) {
        var bitmask = WRAP_BIND_FLAG;
        if (partials.length) {
          var holders = replaceHolders(partials, getHolder(bind));
          bitmask |= WRAP_PARTIAL_FLAG;
        }
        return createWrap(func, bitmask, thisArg, partials, holders);
      });
  
      /**
       * Creates a function that invokes the method at `object[key]` with `partials`
       * prepended to the arguments it receives.
       *
       * This method differs from `_.bind` by allowing bound functions to reference
       * methods that may be redefined or don't yet exist. See
       * [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
       * for more details.
       *
       * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
       * builds, may be used as a placeholder for partially applied arguments.
       *
       * @static
       * @memberOf _
       * @since 0.10.0
       * @category Function
       * @param {Object} object The object to invoke the method on.
       * @param {string} key The key of the method.
       * @param {...*} [partials] The arguments to be partially applied.
       * @returns {Function} Returns the new bound function.
       * @example
       *
       * var object = {
       *   'user': 'fred',
       *   'greet': function(greeting, punctuation) {
       *     return greeting + ' ' + this.user + punctuation;
       *   }
       * };
       *
       * var bound = _.bindKey(object, 'greet', 'hi');
       * bound('!');
       * // => 'hi fred!'
       *
       * object.greet = function(greeting, punctuation) {
       *   return greeting + 'ya ' + this.user + punctuation;
       * };
       *
       * bound('!');
       * // => 'hiya fred!'
       *
       * // Bound with placeholders.
       * var bound = _.bindKey(object, 'greet', _, '!');
       * bound('hi');
       * // => 'hiya fred!'
       */
      var bindKey = baseRest(function(object, key, partials) {
        var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;
        if (partials.length) {
          var holders = replaceHolders(partials, getHolder(bindKey));
          bitmask |= WRAP_PARTIAL_FLAG;
        }
        return createWrap(key, bitmask, object, partials, holders);
      });
  
      /**
       * Creates a function that accepts arguments of `func` and either invokes
       * `func` returning its result, if at least `arity` number of arguments have
       * been provided, or returns a function that accepts the remaining `func`
       * arguments, and so on. The arity of `func` may be specified if `func.length`
       * is not sufficient.
       *
       * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
       * may be used as a placeholder for provided arguments.
       *
       * **Note:** This method doesn't set the "length" property of curried functions.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Function
       * @param {Function} func The function to curry.
       * @param {number} [arity=func.length] The arity of `func`.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Function} Returns the new curried function.
       * @example
       *
       * var abc = function(a, b, c) {
       *   return [a, b, c];
       * };
       *
       * var curried = _.curry(abc);
       *
       * curried(1)(2)(3);
       * // => [1, 2, 3]
       *
       * curried(1, 2)(3);
       * // => [1, 2, 3]
       *
       * curried(1, 2, 3);
       * // => [1, 2, 3]
       *
       * // Curried with placeholders.
       * curried(1)(_, 3)(2);
       * // => [1, 2, 3]
       */
      function curry(func, arity, guard) {
        arity = guard ? undefined : arity;
        var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
        result.placeholder = curry.placeholder;
        return result;
      }
  
      /**
       * This method is like `_.curry` except that arguments are applied to `func`
       * in the manner of `_.partialRight` instead of `_.partial`.
       *
       * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
       * builds, may be used as a placeholder for provided arguments.
       *
       * **Note:** This method doesn't set the "length" property of curried functions.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Function
       * @param {Function} func The function to curry.
       * @param {number} [arity=func.length] The arity of `func`.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Function} Returns the new curried function.
       * @example
       *
       * var abc = function(a, b, c) {
       *   return [a, b, c];
       * };
       *
       * var curried = _.curryRight(abc);
       *
       * curried(3)(2)(1);
       * // => [1, 2, 3]
       *
       * curried(2, 3)(1);
       * // => [1, 2, 3]
       *
       * curried(1, 2, 3);
       * // => [1, 2, 3]
       *
       * // Curried with placeholders.
       * curried(3)(1, _)(2);
       * // => [1, 2, 3]
       */
      function curryRight(func, arity, guard) {
        arity = guard ? undefined : arity;
        var result = createWrap(func, WRAP_CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
        result.placeholder = curryRight.placeholder;
        return result;
      }
  
      /**
       * Creates a debounced function that delays invoking `func` until after `wait`
       * milliseconds have elapsed since the last time the debounced function was
       * invoked. The debounced function comes with a `cancel` method to cancel
       * delayed `func` invocations and a `flush` method to immediately invoke them.
       * Provide `options` to indicate whether `func` should be invoked on the
       * leading and/or trailing edge of the `wait` timeout. The `func` is invoked
       * with the last arguments provided to the debounced function. Subsequent
       * calls to the debounced function return the result of the last `func`
       * invocation.
       *
       * **Note:** If `leading` and `trailing` options are `true`, `func` is
       * invoked on the trailing edge of the timeout only if the debounced function
       * is invoked more than once during the `wait` timeout.
       *
       * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
       * until to the next tick, similar to `setTimeout` with a timeout of `0`.
       *
       * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
       * for details over the differences between `_.debounce` and `_.throttle`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to debounce.
       * @param {number} [wait=0] The number of milliseconds to delay.
       * @param {Object} [options={}] The options object.
       * @param {boolean} [options.leading=false]
       *  Specify invoking on the leading edge of the timeout.
       * @param {number} [options.maxWait]
       *  The maximum time `func` is allowed to be delayed before it's invoked.
       * @param {boolean} [options.trailing=true]
       *  Specify invoking on the trailing edge of the timeout.
       * @returns {Function} Returns the new debounced function.
       * @example
       *
       * // Avoid costly calculations while the window size is in flux.
       * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
       *
       * // Invoke `sendMail` when clicked, debouncing subsequent calls.
       * jQuery(element).on('click', _.debounce(sendMail, 300, {
       *   'leading': true,
       *   'trailing': false
       * }));
       *
       * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
       * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
       * var source = new EventSource('/stream');
       * jQuery(source).on('message', debounced);
       *
       * // Cancel the trailing debounced invocation.
       * jQuery(window).on('popstate', debounced.cancel);
       */
      function debounce(func, wait, options) {
        var lastArgs,
            lastThis,
            maxWait,
            result,
            timerId,
            lastCallTime,
            lastInvokeTime = 0,
            leading = false,
            maxing = false,
            trailing = true;
  
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        wait = toNumber(wait) || 0;
        if (isObject(options)) {
          leading = !!options.leading;
          maxing = 'maxWait' in options;
          maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
          trailing = 'trailing' in options ? !!options.trailing : trailing;
        }
  
        function invokeFunc(time) {
          var args = lastArgs,
              thisArg = lastThis;
  
          lastArgs = lastThis = undefined;
          lastInvokeTime = time;
          result = func.apply(thisArg, args);
          return result;
        }
  
        function leadingEdge(time) {
          // Reset any `maxWait` timer.
          lastInvokeTime = time;
          // Start the timer for the trailing edge.
          timerId = setTimeout(timerExpired, wait);
          // Invoke the leading edge.
          return leading ? invokeFunc(time) : result;
        }
  
        function remainingWait(time) {
          var timeSinceLastCall = time - lastCallTime,
              timeSinceLastInvoke = time - lastInvokeTime,
              result = wait - timeSinceLastCall;
  
          return maxing ? nativeMin(result, maxWait - timeSinceLastInvoke) : result;
        }
  
        function shouldInvoke(time) {
          var timeSinceLastCall = time - lastCallTime,
              timeSinceLastInvoke = time - lastInvokeTime;
  
          // Either this is the first call, activity has stopped and we're at the
          // trailing edge, the system time has gone backwards and we're treating
          // it as the trailing edge, or we've hit the `maxWait` limit.
          return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||
            (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
        }
  
        function timerExpired() {
          var time = now();
          if (shouldInvoke(time)) {
            return trailingEdge(time);
          }
          // Restart the timer.
          timerId = setTimeout(timerExpired, remainingWait(time));
        }
  
        function trailingEdge(time) {
          timerId = undefined;
  
          // Only invoke if we have `lastArgs` which means `func` has been
          // debounced at least once.
          if (trailing && lastArgs) {
            return invokeFunc(time);
          }
          lastArgs = lastThis = undefined;
          return result;
        }
  
        function cancel() {
          if (timerId !== undefined) {
            clearTimeout(timerId);
          }
          lastInvokeTime = 0;
          lastArgs = lastCallTime = lastThis = timerId = undefined;
        }
  
        function flush() {
          return timerId === undefined ? result : trailingEdge(now());
        }
  
        function debounced() {
          var time = now(),
              isInvoking = shouldInvoke(time);
  
          lastArgs = arguments;
          lastThis = this;
          lastCallTime = time;
  
          if (isInvoking) {
            if (timerId === undefined) {
              return leadingEdge(lastCallTime);
            }
            if (maxing) {
              // Handle invocations in a tight loop.
              timerId = setTimeout(timerExpired, wait);
              return invokeFunc(lastCallTime);
            }
          }
          if (timerId === undefined) {
            timerId = setTimeout(timerExpired, wait);
          }
          return result;
        }
        debounced.cancel = cancel;
        debounced.flush = flush;
        return debounced;
      }
  
      /**
       * Defers invoking the `func` until the current call stack has cleared. Any
       * additional arguments are provided to `func` when it's invoked.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to defer.
       * @param {...*} [args] The arguments to invoke `func` with.
       * @returns {number} Returns the timer id.
       * @example
       *
       * _.defer(function(text) {
       *   console.log(text);
       * }, 'deferred');
       * // => Logs 'deferred' after one millisecond.
       */
      var defer = baseRest(function(func, args) {
        return baseDelay(func, 1, args);
      });
  
      /**
       * Invokes `func` after `wait` milliseconds. Any additional arguments are
       * provided to `func` when it's invoked.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to delay.
       * @param {number} wait The number of milliseconds to delay invocation.
       * @param {...*} [args] The arguments to invoke `func` with.
       * @returns {number} Returns the timer id.
       * @example
       *
       * _.delay(function(text) {
       *   console.log(text);
       * }, 1000, 'later');
       * // => Logs 'later' after one second.
       */
      var delay = baseRest(function(func, wait, args) {
        return baseDelay(func, toNumber(wait) || 0, args);
      });
  
      /**
       * Creates a function that invokes `func` with arguments reversed.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Function
       * @param {Function} func The function to flip arguments for.
       * @returns {Function} Returns the new flipped function.
       * @example
       *
       * var flipped = _.flip(function() {
       *   return _.toArray(arguments);
       * });
       *
       * flipped('a', 'b', 'c', 'd');
       * // => ['d', 'c', 'b', 'a']
       */
      function flip(func) {
        return createWrap(func, WRAP_FLIP_FLAG);
      }
  
      /**
       * Creates a function that memoizes the result of `func`. If `resolver` is
       * provided, it determines the cache key for storing the result based on the
       * arguments provided to the memoized function. By default, the first argument
       * provided to the memoized function is used as the map cache key. The `func`
       * is invoked with the `this` binding of the memoized function.
       *
       * **Note:** The cache is exposed as the `cache` property on the memoized
       * function. Its creation may be customized by replacing the `_.memoize.Cache`
       * constructor with one whose instances implement the
       * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
       * method interface of `clear`, `delete`, `get`, `has`, and `set`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to have its output memoized.
       * @param {Function} [resolver] The function to resolve the cache key.
       * @returns {Function} Returns the new memoized function.
       * @example
       *
       * var object = { 'a': 1, 'b': 2 };
       * var other = { 'c': 3, 'd': 4 };
       *
       * var values = _.memoize(_.values);
       * values(object);
       * // => [1, 2]
       *
       * values(other);
       * // => [3, 4]
       *
       * object.a = 2;
       * values(object);
       * // => [1, 2]
       *
       * // Modify the result cache.
       * values.cache.set(object, ['a', 'b']);
       * values(object);
       * // => ['a', 'b']
       *
       * // Replace `_.memoize.Cache`.
       * _.memoize.Cache = WeakMap;
       */
      function memoize(func, resolver) {
        if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        var memoized = function() {
          var args = arguments,
              key = resolver ? resolver.apply(this, args) : args[0],
              cache = memoized.cache;
  
          if (cache.has(key)) {
            return cache.get(key);
          }
          var result = func.apply(this, args);
          memoized.cache = cache.set(key, result) || cache;
          return result;
        };
        memoized.cache = new (memoize.Cache || MapCache);
        return memoized;
      }
  
      // Expose `MapCache`.
      memoize.Cache = MapCache;
  
      /**
       * Creates a function that negates the result of the predicate `func`. The
       * `func` predicate is invoked with the `this` binding and arguments of the
       * created function.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Function
       * @param {Function} predicate The predicate to negate.
       * @returns {Function} Returns the new negated function.
       * @example
       *
       * function isEven(n) {
       *   return n % 2 == 0;
       * }
       *
       * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
       * // => [1, 3, 5]
       */
      function negate(predicate) {
        if (typeof predicate != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        return function() {
          var args = arguments;
          switch (args.length) {
            case 0: return !predicate.call(this);
            case 1: return !predicate.call(this, args[0]);
            case 2: return !predicate.call(this, args[0], args[1]);
            case 3: return !predicate.call(this, args[0], args[1], args[2]);
          }
          return !predicate.apply(this, args);
        };
      }
  
      /**
       * Creates a function that is restricted to invoking `func` once. Repeat calls
       * to the function return the value of the first invocation. The `func` is
       * invoked with the `this` binding and arguments of the created function.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to restrict.
       * @returns {Function} Returns the new restricted function.
       * @example
       *
       * var initialize = _.once(createApplication);
       * initialize();
       * initialize();
       * // => `createApplication` is invoked once
       */
      function once(func) {
        return before(2, func);
      }
  
      /**
       * Creates a function that invokes `func` with its arguments transformed.
       *
       * @static
       * @since 4.0.0
       * @memberOf _
       * @category Function
       * @param {Function} func The function to wrap.
       * @param {...(Function|Function[])} [transforms=[_.identity]]
       *  The argument transforms.
       * @returns {Function} Returns the new function.
       * @example
       *
       * function doubled(n) {
       *   return n * 2;
       * }
       *
       * function square(n) {
       *   return n * n;
       * }
       *
       * var func = _.overArgs(function(x, y) {
       *   return [x, y];
       * }, [square, doubled]);
       *
       * func(9, 3);
       * // => [81, 6]
       *
       * func(10, 5);
       * // => [100, 10]
       */
      var overArgs = castRest(function(func, transforms) {
        transforms = (transforms.length == 1 && isArray(transforms[0]))
          ? arrayMap(transforms[0], baseUnary(getIteratee()))
          : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));
  
        var funcsLength = transforms.length;
        return baseRest(function(args) {
          var index = -1,
              length = nativeMin(args.length, funcsLength);
  
          while (++index < length) {
            args[index] = transforms[index].call(this, args[index]);
          }
          return apply(func, this, args);
        });
      });
  
      /**
       * Creates a function that invokes `func` with `partials` prepended to the
       * arguments it receives. This method is like `_.bind` except it does **not**
       * alter the `this` binding.
       *
       * The `_.partial.placeholder` value, which defaults to `_` in monolithic
       * builds, may be used as a placeholder for partially applied arguments.
       *
       * **Note:** This method doesn't set the "length" property of partially
       * applied functions.
       *
       * @static
       * @memberOf _
       * @since 0.2.0
       * @category Function
       * @param {Function} func The function to partially apply arguments to.
       * @param {...*} [partials] The arguments to be partially applied.
       * @returns {Function} Returns the new partially applied function.
       * @example
       *
       * function greet(greeting, name) {
       *   return greeting + ' ' + name;
       * }
       *
       * var sayHelloTo = _.partial(greet, 'hello');
       * sayHelloTo('fred');
       * // => 'hello fred'
       *
       * // Partially applied with placeholders.
       * var greetFred = _.partial(greet, _, 'fred');
       * greetFred('hi');
       * // => 'hi fred'
       */
      var partial = baseRest(function(func, partials) {
        var holders = replaceHolders(partials, getHolder(partial));
        return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders);
      });
  
      /**
       * This method is like `_.partial` except that partially applied arguments
       * are appended to the arguments it receives.
       *
       * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
       * builds, may be used as a placeholder for partially applied arguments.
       *
       * **Note:** This method doesn't set the "length" property of partially
       * applied functions.
       *
       * @static
       * @memberOf _
       * @since 1.0.0
       * @category Function
       * @param {Function} func The function to partially apply arguments to.
       * @param {...*} [partials] The arguments to be partially applied.
       * @returns {Function} Returns the new partially applied function.
       * @example
       *
       * function greet(greeting, name) {
       *   return greeting + ' ' + name;
       * }
       *
       * var greetFred = _.partialRight(greet, 'fred');
       * greetFred('hi');
       * // => 'hi fred'
       *
       * // Partially applied with placeholders.
       * var sayHelloTo = _.partialRight(greet, 'hello', _);
       * sayHelloTo('fred');
       * // => 'hello fred'
       */
      var partialRight = baseRest(function(func, partials) {
        var holders = replaceHolders(partials, getHolder(partialRight));
        return createWrap(func, WRAP_PARTIAL_RIGHT_FLAG, undefined, partials, holders);
      });
  
      /**
       * Creates a function that invokes `func` with arguments arranged according
       * to the specified `indexes` where the argument value at the first index is
       * provided as the first argument, the argument value at the second index is
       * provided as the second argument, and so on.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Function
       * @param {Function} func The function to rearrange arguments for.
       * @param {...(number|number[])} indexes The arranged argument indexes.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var rearged = _.rearg(function(a, b, c) {
       *   return [a, b, c];
       * }, [2, 0, 1]);
       *
       * rearged('b', 'c', 'a')
       * // => ['a', 'b', 'c']
       */
      var rearg = flatRest(function(func, indexes) {
        return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes);
      });
  
      /**
       * Creates a function that invokes `func` with the `this` binding of the
       * created function and arguments from `start` and beyond provided as
       * an array.
       *
       * **Note:** This method is based on the
       * [rest parameter](https://mdn.io/rest_parameters).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Function
       * @param {Function} func The function to apply a rest parameter to.
       * @param {number} [start=func.length-1] The start position of the rest parameter.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var say = _.rest(function(what, names) {
       *   return what + ' ' + _.initial(names).join(', ') +
       *     (_.size(names) > 1 ? ', & ' : '') + _.last(names);
       * });
       *
       * say('hello', 'fred', 'barney', 'pebbles');
       * // => 'hello fred, barney, & pebbles'
       */
      function rest(func, start) {
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        start = start === undefined ? start : toInteger(start);
        return baseRest(func, start);
      }
  
      /**
       * Creates a function that invokes `func` with the `this` binding of the
       * create function and an array of arguments much like
       * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).
       *
       * **Note:** This method is based on the
       * [spread operator](https://mdn.io/spread_operator).
       *
       * @static
       * @memberOf _
       * @since 3.2.0
       * @category Function
       * @param {Function} func The function to spread arguments over.
       * @param {number} [start=0] The start position of the spread.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var say = _.spread(function(who, what) {
       *   return who + ' says ' + what;
       * });
       *
       * say(['fred', 'hello']);
       * // => 'fred says hello'
       *
       * var numbers = Promise.all([
       *   Promise.resolve(40),
       *   Promise.resolve(36)
       * ]);
       *
       * numbers.then(_.spread(function(x, y) {
       *   return x + y;
       * }));
       * // => a Promise of 76
       */
      function spread(func, start) {
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        start = start == null ? 0 : nativeMax(toInteger(start), 0);
        return baseRest(function(args) {
          var array = args[start],
              otherArgs = castSlice(args, 0, start);
  
          if (array) {
            arrayPush(otherArgs, array);
          }
          return apply(func, this, otherArgs);
        });
      }
  
      /**
       * Creates a throttled function that only invokes `func` at most once per
       * every `wait` milliseconds. The throttled function comes with a `cancel`
       * method to cancel delayed `func` invocations and a `flush` method to
       * immediately invoke them. Provide `options` to indicate whether `func`
       * should be invoked on the leading and/or trailing edge of the `wait`
       * timeout. The `func` is invoked with the last arguments provided to the
       * throttled function. Subsequent calls to the throttled function return the
       * result of the last `func` invocation.
       *
       * **Note:** If `leading` and `trailing` options are `true`, `func` is
       * invoked on the trailing edge of the timeout only if the throttled function
       * is invoked more than once during the `wait` timeout.
       *
       * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
       * until to the next tick, similar to `setTimeout` with a timeout of `0`.
       *
       * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
       * for details over the differences between `_.throttle` and `_.debounce`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to throttle.
       * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
       * @param {Object} [options={}] The options object.
       * @param {boolean} [options.leading=true]
       *  Specify invoking on the leading edge of the timeout.
       * @param {boolean} [options.trailing=true]
       *  Specify invoking on the trailing edge of the timeout.
       * @returns {Function} Returns the new throttled function.
       * @example
       *
       * // Avoid excessively updating the position while scrolling.
       * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
       *
       * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
       * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
       * jQuery(element).on('click', throttled);
       *
       * // Cancel the trailing throttled invocation.
       * jQuery(window).on('popstate', throttled.cancel);
       */
      function throttle(func, wait, options) {
        var leading = true,
            trailing = true;
  
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        if (isObject(options)) {
          leading = 'leading' in options ? !!options.leading : leading;
          trailing = 'trailing' in options ? !!options.trailing : trailing;
        }
        return debounce(func, wait, {
          'leading': leading,
          'maxWait': wait,
          'trailing': trailing
        });
      }
  
      /**
       * Creates a function that accepts up to one argument, ignoring any
       * additional arguments.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Function
       * @param {Function} func The function to cap arguments for.
       * @returns {Function} Returns the new capped function.
       * @example
       *
       * _.map(['6', '8', '10'], _.unary(parseInt));
       * // => [6, 8, 10]
       */
      function unary(func) {
        return ary(func, 1);
      }
  
      /**
       * Creates a function that provides `value` to `wrapper` as its first
       * argument. Any additional arguments provided to the function are appended
       * to those provided to the `wrapper`. The wrapper is invoked with the `this`
       * binding of the created function.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {*} value The value to wrap.
       * @param {Function} [wrapper=identity] The wrapper function.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var p = _.wrap(_.escape, function(func, text) {
       *   return '<p>' + func(text) + '</p>';
       * });
       *
       * p('fred, barney, & pebbles');
       * // => '<p>fred, barney, &amp; pebbles</p>'
       */
      function wrap(value, wrapper) {
        return partial(castFunction(wrapper), value);
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Casts `value` as an array if it's not one.
       *
       * @static
       * @memberOf _
       * @since 4.4.0
       * @category Lang
       * @param {*} value The value to inspect.
       * @returns {Array} Returns the cast array.
       * @example
       *
       * _.castArray(1);
       * // => [1]
       *
       * _.castArray({ 'a': 1 });
       * // => [{ 'a': 1 }]
       *
       * _.castArray('abc');
       * // => ['abc']
       *
       * _.castArray(null);
       * // => [null]
       *
       * _.castArray(undefined);
       * // => [undefined]
       *
       * _.castArray();
       * // => []
       *
       * var array = [1, 2, 3];
       * console.log(_.castArray(array) === array);
       * // => true
       */
      function castArray() {
        if (!arguments.length) {
          return [];
        }
        var value = arguments[0];
        return isArray(value) ? value : [value];
      }
  
      /**
       * Creates a shallow clone of `value`.
       *
       * **Note:** This method is loosely based on the
       * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)
       * and supports cloning arrays, array buffers, booleans, date objects, maps,
       * numbers, `Object` objects, regexes, sets, strings, symbols, and typed
       * arrays. The own enumerable properties of `arguments` objects are cloned
       * as plain objects. An empty object is returned for uncloneable values such
       * as error objects, functions, DOM nodes, and WeakMaps.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to clone.
       * @returns {*} Returns the cloned value.
       * @see _.cloneDeep
       * @example
       *
       * var objects = [{ 'a': 1 }, { 'b': 2 }];
       *
       * var shallow = _.clone(objects);
       * console.log(shallow[0] === objects[0]);
       * // => true
       */
      function clone(value) {
        return baseClone(value, CLONE_SYMBOLS_FLAG);
      }
  
      /**
       * This method is like `_.clone` except that it accepts `customizer` which
       * is invoked to produce the cloned value. If `customizer` returns `undefined`,
       * cloning is handled by the method instead. The `customizer` is invoked with
       * up to four arguments; (value [, index|key, object, stack]).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to clone.
       * @param {Function} [customizer] The function to customize cloning.
       * @returns {*} Returns the cloned value.
       * @see _.cloneDeepWith
       * @example
       *
       * function customizer(value) {
       *   if (_.isElement(value)) {
       *     return value.cloneNode(false);
       *   }
       * }
       *
       * var el = _.cloneWith(document.body, customizer);
       *
       * console.log(el === document.body);
       * // => false
       * console.log(el.nodeName);
       * // => 'BODY'
       * console.log(el.childNodes.length);
       * // => 0
       */
      function cloneWith(value, customizer) {
        customizer = typeof customizer == 'function' ? customizer : undefined;
        return baseClone(value, CLONE_SYMBOLS_FLAG, customizer);
      }
  
      /**
       * This method is like `_.clone` except that it recursively clones `value`.
       *
       * @static
       * @memberOf _
       * @since 1.0.0
       * @category Lang
       * @param {*} value The value to recursively clone.
       * @returns {*} Returns the deep cloned value.
       * @see _.clone
       * @example
       *
       * var objects = [{ 'a': 1 }, { 'b': 2 }];
       *
       * var deep = _.cloneDeep(objects);
       * console.log(deep[0] === objects[0]);
       * // => false
       */
      function cloneDeep(value) {
        return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG);
      }
  
      /**
       * This method is like `_.cloneWith` except that it recursively clones `value`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to recursively clone.
       * @param {Function} [customizer] The function to customize cloning.
       * @returns {*} Returns the deep cloned value.
       * @see _.cloneWith
       * @example
       *
       * function customizer(value) {
       *   if (_.isElement(value)) {
       *     return value.cloneNode(true);
       *   }
       * }
       *
       * var el = _.cloneDeepWith(document.body, customizer);
       *
       * console.log(el === document.body);
       * // => false
       * console.log(el.nodeName);
       * // => 'BODY'
       * console.log(el.childNodes.length);
       * // => 20
       */
      function cloneDeepWith(value, customizer) {
        customizer = typeof customizer == 'function' ? customizer : undefined;
        return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer);
      }
  
      /**
       * Checks if `object` conforms to `source` by invoking the predicate
       * properties of `source` with the corresponding property values of `object`.
       *
       * **Note:** This method is equivalent to `_.conforms` when `source` is
       * partially applied.
       *
       * @static
       * @memberOf _
       * @since 4.14.0
       * @category Lang
       * @param {Object} object The object to inspect.
       * @param {Object} source The object of property predicates to conform to.
       * @returns {boolean} Returns `true` if `object` conforms, else `false`.
       * @example
       *
       * var object = { 'a': 1, 'b': 2 };
       *
       * _.conformsTo(object, { 'b': function(n) { return n > 1; } });
       * // => true
       *
       * _.conformsTo(object, { 'b': function(n) { return n > 2; } });
       * // => false
       */
      function conformsTo(object, source) {
        return source == null || baseConformsTo(object, source, keys(source));
      }
  
      /**
       * Performs a
       * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * comparison between two values to determine if they are equivalent.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
       * @example
       *
       * var object = { 'a': 1 };
       * var other = { 'a': 1 };
       *
       * _.eq(object, object);
       * // => true
       *
       * _.eq(object, other);
       * // => false
       *
       * _.eq('a', 'a');
       * // => true
       *
       * _.eq('a', Object('a'));
       * // => false
       *
       * _.eq(NaN, NaN);
       * // => true
       */
      function eq(value, other) {
        return value === other || (value !== value && other !== other);
      }
  
      /**
       * Checks if `value` is greater than `other`.
       *
       * @static
       * @memberOf _
       * @since 3.9.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if `value` is greater than `other`,
       *  else `false`.
       * @see _.lt
       * @example
       *
       * _.gt(3, 1);
       * // => true
       *
       * _.gt(3, 3);
       * // => false
       *
       * _.gt(1, 3);
       * // => false
       */
      var gt = createRelationalOperation(baseGt);
  
      /**
       * Checks if `value` is greater than or equal to `other`.
       *
       * @static
       * @memberOf _
       * @since 3.9.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if `value` is greater than or equal to
       *  `other`, else `false`.
       * @see _.lte
       * @example
       *
       * _.gte(3, 1);
       * // => true
       *
       * _.gte(3, 3);
       * // => true
       *
       * _.gte(1, 3);
       * // => false
       */
      var gte = createRelationalOperation(function(value, other) {
        return value >= other;
      });
  
      /**
       * Checks if `value` is likely an `arguments` object.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an `arguments` object,
       *  else `false`.
       * @example
       *
       * _.isArguments(function() { return arguments; }());
       * // => true
       *
       * _.isArguments([1, 2, 3]);
       * // => false
       */
      var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
        return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&
          !propertyIsEnumerable.call(value, 'callee');
      };
  
      /**
       * Checks if `value` is classified as an `Array` object.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an array, else `false`.
       * @example
       *
       * _.isArray([1, 2, 3]);
       * // => true
       *
       * _.isArray(document.body.children);
       * // => false
       *
       * _.isArray('abc');
       * // => false
       *
       * _.isArray(_.noop);
       * // => false
       */
      var isArray = Array.isArray;
  
      /**
       * Checks if `value` is classified as an `ArrayBuffer` object.
       *
       * @static
       * @memberOf _
       * @since 4.3.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
       * @example
       *
       * _.isArrayBuffer(new ArrayBuffer(2));
       * // => true
       *
       * _.isArrayBuffer(new Array(2));
       * // => false
       */
      var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer;
  
      /**
       * Checks if `value` is array-like. A value is considered array-like if it's
       * not a function and has a `value.length` that's an integer greater than or
       * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
       * @example
       *
       * _.isArrayLike([1, 2, 3]);
       * // => true
       *
       * _.isArrayLike(document.body.children);
       * // => true
       *
       * _.isArrayLike('abc');
       * // => true
       *
       * _.isArrayLike(_.noop);
       * // => false
       */
      function isArrayLike(value) {
        return value != null && isLength(value.length) && !isFunction(value);
      }
  
      /**
       * This method is like `_.isArrayLike` except that it also checks if `value`
       * is an object.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an array-like object,
       *  else `false`.
       * @example
       *
       * _.isArrayLikeObject([1, 2, 3]);
       * // => true
       *
       * _.isArrayLikeObject(document.body.children);
       * // => true
       *
       * _.isArrayLikeObject('abc');
       * // => false
       *
       * _.isArrayLikeObject(_.noop);
       * // => false
       */
      function isArrayLikeObject(value) {
        return isObjectLike(value) && isArrayLike(value);
      }
  
      /**
       * Checks if `value` is classified as a boolean primitive or object.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a boolean, else `false`.
       * @example
       *
       * _.isBoolean(false);
       * // => true
       *
       * _.isBoolean(null);
       * // => false
       */
      function isBoolean(value) {
        return value === true || value === false ||
          (isObjectLike(value) && baseGetTag(value) == boolTag);
      }
  
      /**
       * Checks if `value` is a buffer.
       *
       * @static
       * @memberOf _
       * @since 4.3.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
       * @example
       *
       * _.isBuffer(new Buffer(2));
       * // => true
       *
       * _.isBuffer(new Uint8Array(2));
       * // => false
       */
      var isBuffer = nativeIsBuffer || stubFalse;
  
      /**
       * Checks if `value` is classified as a `Date` object.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
       * @example
       *
       * _.isDate(new Date);
       * // => true
       *
       * _.isDate('Mon April 23 2012');
       * // => false
       */
      var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate;
  
      /**
       * Checks if `value` is likely a DOM element.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.
       * @example
       *
       * _.isElement(document.body);
       * // => true
       *
       * _.isElement('<body>');
       * // => false
       */
      function isElement(value) {
        return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);
      }
  
      /**
       * Checks if `value` is an empty object, collection, map, or set.
       *
       * Objects are considered empty if they have no own enumerable string keyed
       * properties.
       *
       * Array-like values such as `arguments` objects, arrays, buffers, strings, or
       * jQuery-like collections are considered empty if they have a `length` of `0`.
       * Similarly, maps and sets are considered empty if they have a `size` of `0`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is empty, else `false`.
       * @example
       *
       * _.isEmpty(null);
       * // => true
       *
       * _.isEmpty(true);
       * // => true
       *
       * _.isEmpty(1);
       * // => true
       *
       * _.isEmpty([1, 2, 3]);
       * // => false
       *
       * _.isEmpty({ 'a': 1 });
       * // => false
       */
      function isEmpty(value) {
        if (value == null) {
          return true;
        }
        if (isArrayLike(value) &&
            (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' ||
              isBuffer(value) || isTypedArray(value) || isArguments(value))) {
          return !value.length;
        }
        var tag = getTag(value);
        if (tag == mapTag || tag == setTag) {
          return !value.size;
        }
        if (isPrototype(value)) {
          return !baseKeys(value).length;
        }
        for (var key in value) {
          if (hasOwnProperty.call(value, key)) {
            return false;
          }
        }
        return true;
      }
  
      /**
       * Performs a deep comparison between two values to determine if they are
       * equivalent.
       *
       * **Note:** This method supports comparing arrays, array buffers, booleans,
       * date objects, error objects, maps, numbers, `Object` objects, regexes,
       * sets, strings, symbols, and typed arrays. `Object` objects are compared
       * by their own, not inherited, enumerable properties. Functions and DOM
       * nodes are compared by strict equality, i.e. `===`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
       * @example
       *
       * var object = { 'a': 1 };
       * var other = { 'a': 1 };
       *
       * _.isEqual(object, other);
       * // => true
       *
       * object === other;
       * // => false
       */
      function isEqual(value, other) {
        return baseIsEqual(value, other);
      }
  
      /**
       * This method is like `_.isEqual` except that it accepts `customizer` which
       * is invoked to compare values. If `customizer` returns `undefined`, comparisons
       * are handled by the method instead. The `customizer` is invoked with up to
       * six arguments: (objValue, othValue [, index|key, object, other, stack]).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @param {Function} [customizer] The function to customize comparisons.
       * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
       * @example
       *
       * function isGreeting(value) {
       *   return /^h(?:i|ello)$/.test(value);
       * }
       *
       * function customizer(objValue, othValue) {
       *   if (isGreeting(objValue) && isGreeting(othValue)) {
       *     return true;
       *   }
       * }
       *
       * var array = ['hello', 'goodbye'];
       * var other = ['hi', 'goodbye'];
       *
       * _.isEqualWith(array, other, customizer);
       * // => true
       */
      function isEqualWith(value, other, customizer) {
        customizer = typeof customizer == 'function' ? customizer : undefined;
        var result = customizer ? customizer(value, other) : undefined;
        return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;
      }
  
      /**
       * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
       * `SyntaxError`, `TypeError`, or `URIError` object.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an error object, else `false`.
       * @example
       *
       * _.isError(new Error);
       * // => true
       *
       * _.isError(Error);
       * // => false
       */
      function isError(value) {
        if (!isObjectLike(value)) {
          return false;
        }
        var tag = baseGetTag(value);
        return tag == errorTag || tag == domExcTag ||
          (typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value));
      }
  
      /**
       * Checks if `value` is a finite primitive number.
       *
       * **Note:** This method is based on
       * [`Number.isFinite`](https://mdn.io/Number/isFinite).
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.
       * @example
       *
       * _.isFinite(3);
       * // => true
       *
       * _.isFinite(Number.MIN_VALUE);
       * // => true
       *
       * _.isFinite(Infinity);
       * // => false
       *
       * _.isFinite('3');
       * // => false
       */
      function isFinite(value) {
        return typeof value == 'number' && nativeIsFinite(value);
      }
  
      /**
       * Checks if `value` is classified as a `Function` object.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a function, else `false`.
       * @example
       *
       * _.isFunction(_);
       * // => true
       *
       * _.isFunction(/abc/);
       * // => false
       */
      function isFunction(value) {
        if (!isObject(value)) {
          return false;
        }
        // The use of `Object#toString` avoids issues with the `typeof` operator
        // in Safari 9 which returns 'object' for typed arrays and other constructors.
        var tag = baseGetTag(value);
        return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
      }
  
      /**
       * Checks if `value` is an integer.
       *
       * **Note:** This method is based on
       * [`Number.isInteger`](https://mdn.io/Number/isInteger).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an integer, else `false`.
       * @example
       *
       * _.isInteger(3);
       * // => true
       *
       * _.isInteger(Number.MIN_VALUE);
       * // => false
       *
       * _.isInteger(Infinity);
       * // => false
       *
       * _.isInteger('3');
       * // => false
       */
      function isInteger(value) {
        return typeof value == 'number' && value == toInteger(value);
      }
  
      /**
       * Checks if `value` is a valid array-like length.
       *
       * **Note:** This method is loosely based on
       * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
       * @example
       *
       * _.isLength(3);
       * // => true
       *
       * _.isLength(Number.MIN_VALUE);
       * // => false
       *
       * _.isLength(Infinity);
       * // => false
       *
       * _.isLength('3');
       * // => false
       */
      function isLength(value) {
        return typeof value == 'number' &&
          value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
      }
  
      /**
       * Checks if `value` is the
       * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
       * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an object, else `false`.
       * @example
       *
       * _.isObject({});
       * // => true
       *
       * _.isObject([1, 2, 3]);
       * // => true
       *
       * _.isObject(_.noop);
       * // => true
       *
       * _.isObject(null);
       * // => false
       */
      function isObject(value) {
        var type = typeof value;
        return value != null && (type == 'object' || type == 'function');
      }
  
      /**
       * Checks if `value` is object-like. A value is object-like if it's not `null`
       * and has a `typeof` result of "object".
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
       * @example
       *
       * _.isObjectLike({});
       * // => true
       *
       * _.isObjectLike([1, 2, 3]);
       * // => true
       *
       * _.isObjectLike(_.noop);
       * // => false
       *
       * _.isObjectLike(null);
       * // => false
       */
      function isObjectLike(value) {
        return value != null && typeof value == 'object';
      }
  
      /**
       * Checks if `value` is classified as a `Map` object.
       *
       * @static
       * @memberOf _
       * @since 4.3.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a map, else `false`.
       * @example
       *
       * _.isMap(new Map);
       * // => true
       *
       * _.isMap(new WeakMap);
       * // => false
       */
      var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;
  
      /**
       * Performs a partial deep comparison between `object` and `source` to
       * determine if `object` contains equivalent property values.
       *
       * **Note:** This method is equivalent to `_.matches` when `source` is
       * partially applied.
       *
       * Partial comparisons will match empty array and empty object `source`
       * values against any array or object value, respectively. See `_.isEqual`
       * for a list of supported value comparisons.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Lang
       * @param {Object} object The object to inspect.
       * @param {Object} source The object of property values to match.
       * @returns {boolean} Returns `true` if `object` is a match, else `false`.
       * @example
       *
       * var object = { 'a': 1, 'b': 2 };
       *
       * _.isMatch(object, { 'b': 2 });
       * // => true
       *
       * _.isMatch(object, { 'b': 1 });
       * // => false
       */
      function isMatch(object, source) {
        return object === source || baseIsMatch(object, source, getMatchData(source));
      }
  
      /**
       * This method is like `_.isMatch` except that it accepts `customizer` which
       * is invoked to compare values. If `customizer` returns `undefined`, comparisons
       * are handled by the method instead. The `customizer` is invoked with five
       * arguments: (objValue, srcValue, index|key, object, source).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {Object} object The object to inspect.
       * @param {Object} source The object of property values to match.
       * @param {Function} [customizer] The function to customize comparisons.
       * @returns {boolean} Returns `true` if `object` is a match, else `false`.
       * @example
       *
       * function isGreeting(value) {
       *   return /^h(?:i|ello)$/.test(value);
       * }
       *
       * function customizer(objValue, srcValue) {
       *   if (isGreeting(objValue) && isGreeting(srcValue)) {
       *     return true;
       *   }
       * }
       *
       * var object = { 'greeting': 'hello' };
       * var source = { 'greeting': 'hi' };
       *
       * _.isMatchWith(object, source, customizer);
       * // => true
       */
      function isMatchWith(object, source, customizer) {
        customizer = typeof customizer == 'function' ? customizer : undefined;
        return baseIsMatch(object, source, getMatchData(source), customizer);
      }
  
      /**
       * Checks if `value` is `NaN`.
       *
       * **Note:** This method is based on
       * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
       * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
       * `undefined` and other non-number values.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
       * @example
       *
       * _.isNaN(NaN);
       * // => true
       *
       * _.isNaN(new Number(NaN));
       * // => true
       *
       * isNaN(undefined);
       * // => true
       *
       * _.isNaN(undefined);
       * // => false
       */
      function isNaN(value) {
        // An `NaN` primitive is the only value that is not equal to itself.
        // Perform the `toStringTag` check first to avoid errors with some
        // ActiveX objects in IE.
        return isNumber(value) && value != +value;
      }
  
      /**
       * Checks if `value` is a pristine native function.
       *
       * **Note:** This method can't reliably detect native functions in the presence
       * of the core-js package because core-js circumvents this kind of detection.
       * Despite multiple requests, the core-js maintainer has made it clear: any
       * attempt to fix the detection will be obstructed. As a result, we're left
       * with little choice but to throw an error. Unfortunately, this also affects
       * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
       * which rely on core-js.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a native function,
       *  else `false`.
       * @example
       *
       * _.isNative(Array.prototype.push);
       * // => true
       *
       * _.isNative(_);
       * // => false
       */
      function isNative(value) {
        if (isMaskable(value)) {
          throw new Error(CORE_ERROR_TEXT);
        }
        return baseIsNative(value);
      }
  
      /**
       * Checks if `value` is `null`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is `null`, else `false`.
       * @example
       *
       * _.isNull(null);
       * // => true
       *
       * _.isNull(void 0);
       * // => false
       */
      function isNull(value) {
        return value === null;
      }
  
      /**
       * Checks if `value` is `null` or `undefined`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is nullish, else `false`.
       * @example
       *
       * _.isNil(null);
       * // => true
       *
       * _.isNil(void 0);
       * // => true
       *
       * _.isNil(NaN);
       * // => false
       */
      function isNil(value) {
        return value == null;
      }
  
      /**
       * Checks if `value` is classified as a `Number` primitive or object.
       *
       * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
       * classified as numbers, use the `_.isFinite` method.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a number, else `false`.
       * @example
       *
       * _.isNumber(3);
       * // => true
       *
       * _.isNumber(Number.MIN_VALUE);
       * // => true
       *
       * _.isNumber(Infinity);
       * // => true
       *
       * _.isNumber('3');
       * // => false
       */
      function isNumber(value) {
        return typeof value == 'number' ||
          (isObjectLike(value) && baseGetTag(value) == numberTag);
      }
  
      /**
       * Checks if `value` is a plain object, that is, an object created by the
       * `Object` constructor or one with a `[[Prototype]]` of `null`.
       *
       * @static
       * @memberOf _
       * @since 0.8.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       * }
       *
       * _.isPlainObject(new Foo);
       * // => false
       *
       * _.isPlainObject([1, 2, 3]);
       * // => false
       *
       * _.isPlainObject({ 'x': 0, 'y': 0 });
       * // => true
       *
       * _.isPlainObject(Object.create(null));
       * // => true
       */
      function isPlainObject(value) {
        if (!isObjectLike(value) || baseGetTag(value) != objectTag) {
          return false;
        }
        var proto = getPrototype(value);
        if (proto === null) {
          return true;
        }
        var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;
        return typeof Ctor == 'function' && Ctor instanceof Ctor &&
          funcToString.call(Ctor) == objectCtorString;
      }
  
      /**
       * Checks if `value` is classified as a `RegExp` object.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
       * @example
       *
       * _.isRegExp(/abc/);
       * // => true
       *
       * _.isRegExp('/abc/');
       * // => false
       */
      var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp;
  
      /**
       * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754
       * double precision number which isn't the result of a rounded unsafe integer.
       *
       * **Note:** This method is based on
       * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
       * @example
       *
       * _.isSafeInteger(3);
       * // => true
       *
       * _.isSafeInteger(Number.MIN_VALUE);
       * // => false
       *
       * _.isSafeInteger(Infinity);
       * // => false
       *
       * _.isSafeInteger('3');
       * // => false
       */
      function isSafeInteger(value) {
        return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;
      }
  
      /**
       * Checks if `value` is classified as a `Set` object.
       *
       * @static
       * @memberOf _
       * @since 4.3.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a set, else `false`.
       * @example
       *
       * _.isSet(new Set);
       * // => true
       *
       * _.isSet(new WeakSet);
       * // => false
       */
      var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;
  
      /**
       * Checks if `value` is classified as a `String` primitive or object.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a string, else `false`.
       * @example
       *
       * _.isString('abc');
       * // => true
       *
       * _.isString(1);
       * // => false
       */
      function isString(value) {
        return typeof value == 'string' ||
          (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag);
      }
  
      /**
       * Checks if `value` is classified as a `Symbol` primitive or object.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
       * @example
       *
       * _.isSymbol(Symbol.iterator);
       * // => true
       *
       * _.isSymbol('abc');
       * // => false
       */
      function isSymbol(value) {
        return typeof value == 'symbol' ||
          (isObjectLike(value) && baseGetTag(value) == symbolTag);
      }
  
      /**
       * Checks if `value` is classified as a typed array.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
       * @example
       *
       * _.isTypedArray(new Uint8Array);
       * // => true
       *
       * _.isTypedArray([]);
       * // => false
       */
      var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;
  
      /**
       * Checks if `value` is `undefined`.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
       * @example
       *
       * _.isUndefined(void 0);
       * // => true
       *
       * _.isUndefined(null);
       * // => false
       */
      function isUndefined(value) {
        return value === undefined;
      }
  
      /**
       * Checks if `value` is classified as a `WeakMap` object.
       *
       * @static
       * @memberOf _
       * @since 4.3.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a weak map, else `false`.
       * @example
       *
       * _.isWeakMap(new WeakMap);
       * // => true
       *
       * _.isWeakMap(new Map);
       * // => false
       */
      function isWeakMap(value) {
        return isObjectLike(value) && getTag(value) == weakMapTag;
      }
  
      /**
       * Checks if `value` is classified as a `WeakSet` object.
       *
       * @static
       * @memberOf _
       * @since 4.3.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a weak set, else `false`.
       * @example
       *
       * _.isWeakSet(new WeakSet);
       * // => true
       *
       * _.isWeakSet(new Set);
       * // => false
       */
      function isWeakSet(value) {
        return isObjectLike(value) && baseGetTag(value) == weakSetTag;
      }
  
      /**
       * Checks if `value` is less than `other`.
       *
       * @static
       * @memberOf _
       * @since 3.9.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if `value` is less than `other`,
       *  else `false`.
       * @see _.gt
       * @example
       *
       * _.lt(1, 3);
       * // => true
       *
       * _.lt(3, 3);
       * // => false
       *
       * _.lt(3, 1);
       * // => false
       */
      var lt = createRelationalOperation(baseLt);
  
      /**
       * Checks if `value` is less than or equal to `other`.
       *
       * @static
       * @memberOf _
       * @since 3.9.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if `value` is less than or equal to
       *  `other`, else `false`.
       * @see _.gte
       * @example
       *
       * _.lte(1, 3);
       * // => true
       *
       * _.lte(3, 3);
       * // => true
       *
       * _.lte(3, 1);
       * // => false
       */
      var lte = createRelationalOperation(function(value, other) {
        return value <= other;
      });
  
      /**
       * Converts `value` to an array.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {Array} Returns the converted array.
       * @example
       *
       * _.toArray({ 'a': 1, 'b': 2 });
       * // => [1, 2]
       *
       * _.toArray('abc');
       * // => ['a', 'b', 'c']
       *
       * _.toArray(1);
       * // => []
       *
       * _.toArray(null);
       * // => []
       */
      function toArray(value) {
        if (!value) {
          return [];
        }
        if (isArrayLike(value)) {
          return isString(value) ? stringToArray(value) : copyArray(value);
        }
        if (symIterator && value[symIterator]) {
          return iteratorToArray(value[symIterator]());
        }
        var tag = getTag(value),
            func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values);
  
        return func(value);
      }
  
      /**
       * Converts `value` to a finite number.
       *
       * @static
       * @memberOf _
       * @since 4.12.0
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {number} Returns the converted number.
       * @example
       *
       * _.toFinite(3.2);
       * // => 3.2
       *
       * _.toFinite(Number.MIN_VALUE);
       * // => 5e-324
       *
       * _.toFinite(Infinity);
       * // => 1.7976931348623157e+308
       *
       * _.toFinite('3.2');
       * // => 3.2
       */
      function toFinite(value) {
        if (!value) {
          return value === 0 ? value : 0;
        }
        value = toNumber(value);
        if (value === INFINITY || value === -INFINITY) {
          var sign = (value < 0 ? -1 : 1);
          return sign * MAX_INTEGER;
        }
        return value === value ? value : 0;
      }
  
      /**
       * Converts `value` to an integer.
       *
       * **Note:** This method is loosely based on
       * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {number} Returns the converted integer.
       * @example
       *
       * _.toInteger(3.2);
       * // => 3
       *
       * _.toInteger(Number.MIN_VALUE);
       * // => 0
       *
       * _.toInteger(Infinity);
       * // => 1.7976931348623157e+308
       *
       * _.toInteger('3.2');
       * // => 3
       */
      function toInteger(value) {
        var result = toFinite(value),
            remainder = result % 1;
  
        return result === result ? (remainder ? result - remainder : result) : 0;
      }
  
      /**
       * Converts `value` to an integer suitable for use as the length of an
       * array-like object.
       *
       * **Note:** This method is based on
       * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {number} Returns the converted integer.
       * @example
       *
       * _.toLength(3.2);
       * // => 3
       *
       * _.toLength(Number.MIN_VALUE);
       * // => 0
       *
       * _.toLength(Infinity);
       * // => 4294967295
       *
       * _.toLength('3.2');
       * // => 3
       */
      function toLength(value) {
        return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;
      }
  
      /**
       * Converts `value` to a number.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to process.
       * @returns {number} Returns the number.
       * @example
       *
       * _.toNumber(3.2);
       * // => 3.2
       *
       * _.toNumber(Number.MIN_VALUE);
       * // => 5e-324
       *
       * _.toNumber(Infinity);
       * // => Infinity
       *
       * _.toNumber('3.2');
       * // => 3.2
       */
      function toNumber(value) {
        if (typeof value == 'number') {
          return value;
        }
        if (isSymbol(value)) {
          return NAN;
        }
        if (isObject(value)) {
          var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
          value = isObject(other) ? (other + '') : other;
        }
        if (typeof value != 'string') {
          return value === 0 ? value : +value;
        }
        value = value.replace(reTrim, '');
        var isBinary = reIsBinary.test(value);
        return (isBinary || reIsOctal.test(value))
          ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
          : (reIsBadHex.test(value) ? NAN : +value);
      }
  
      /**
       * Converts `value` to a plain object flattening inherited enumerable string
       * keyed properties of `value` to own properties of the plain object.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {Object} Returns the converted plain object.
       * @example
       *
       * function Foo() {
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.assign({ 'a': 1 }, new Foo);
       * // => { 'a': 1, 'b': 2 }
       *
       * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
       * // => { 'a': 1, 'b': 2, 'c': 3 }
       */
      function toPlainObject(value) {
        return copyObject(value, keysIn(value));
      }
  
      /**
       * Converts `value` to a safe integer. A safe integer can be compared and
       * represented correctly.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {number} Returns the converted integer.
       * @example
       *
       * _.toSafeInteger(3.2);
       * // => 3
       *
       * _.toSafeInteger(Number.MIN_VALUE);
       * // => 0
       *
       * _.toSafeInteger(Infinity);
       * // => 9007199254740991
       *
       * _.toSafeInteger('3.2');
       * // => 3
       */
      function toSafeInteger(value) {
        return value
          ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER)
          : (value === 0 ? value : 0);
      }
  
      /**
       * Converts `value` to a string. An empty string is returned for `null`
       * and `undefined` values. The sign of `-0` is preserved.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {string} Returns the converted string.
       * @example
       *
       * _.toString(null);
       * // => ''
       *
       * _.toString(-0);
       * // => '-0'
       *
       * _.toString([1, 2, 3]);
       * // => '1,2,3'
       */
      function toString(value) {
        return value == null ? '' : baseToString(value);
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Assigns own enumerable string keyed properties of source objects to the
       * destination object. Source objects are applied from left to right.
       * Subsequent sources overwrite property assignments of previous sources.
       *
       * **Note:** This method mutates `object` and is loosely based on
       * [`Object.assign`](https://mdn.io/Object/assign).
       *
       * @static
       * @memberOf _
       * @since 0.10.0
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} [sources] The source objects.
       * @returns {Object} Returns `object`.
       * @see _.assignIn
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       * }
       *
       * function Bar() {
       *   this.c = 3;
       * }
       *
       * Foo.prototype.b = 2;
       * Bar.prototype.d = 4;
       *
       * _.assign({ 'a': 0 }, new Foo, new Bar);
       * // => { 'a': 1, 'c': 3 }
       */
      var assign = createAssigner(function(object, source) {
        if (isPrototype(source) || isArrayLike(source)) {
          copyObject(source, keys(source), object);
          return;
        }
        for (var key in source) {
          if (hasOwnProperty.call(source, key)) {
            assignValue(object, key, source[key]);
          }
        }
      });
  
      /**
       * This method is like `_.assign` except that it iterates over own and
       * inherited source properties.
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @alias extend
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} [sources] The source objects.
       * @returns {Object} Returns `object`.
       * @see _.assign
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       * }
       *
       * function Bar() {
       *   this.c = 3;
       * }
       *
       * Foo.prototype.b = 2;
       * Bar.prototype.d = 4;
       *
       * _.assignIn({ 'a': 0 }, new Foo, new Bar);
       * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
       */
      var assignIn = createAssigner(function(object, source) {
        copyObject(source, keysIn(source), object);
      });
  
      /**
       * This method is like `_.assignIn` except that it accepts `customizer`
       * which is invoked to produce the assigned values. If `customizer` returns
       * `undefined`, assignment is handled by the method instead. The `customizer`
       * is invoked with five arguments: (objValue, srcValue, key, object, source).
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @alias extendWith
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} sources The source objects.
       * @param {Function} [customizer] The function to customize assigned values.
       * @returns {Object} Returns `object`.
       * @see _.assignWith
       * @example
       *
       * function customizer(objValue, srcValue) {
       *   return _.isUndefined(objValue) ? srcValue : objValue;
       * }
       *
       * var defaults = _.partialRight(_.assignInWith, customizer);
       *
       * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
       * // => { 'a': 1, 'b': 2 }
       */
      var assignInWith = createAssigner(function(object, source, srcIndex, customizer) {
        copyObject(source, keysIn(source), object, customizer);
      });
  
      /**
       * This method is like `_.assign` except that it accepts `customizer`
       * which is invoked to produce the assigned values. If `customizer` returns
       * `undefined`, assignment is handled by the method instead. The `customizer`
       * is invoked with five arguments: (objValue, srcValue, key, object, source).
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} sources The source objects.
       * @param {Function} [customizer] The function to customize assigned values.
       * @returns {Object} Returns `object`.
       * @see _.assignInWith
       * @example
       *
       * function customizer(objValue, srcValue) {
       *   return _.isUndefined(objValue) ? srcValue : objValue;
       * }
       *
       * var defaults = _.partialRight(_.assignWith, customizer);
       *
       * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
       * // => { 'a': 1, 'b': 2 }
       */
      var assignWith = createAssigner(function(object, source, srcIndex, customizer) {
        copyObject(source, keys(source), object, customizer);
      });
  
      /**
       * Creates an array of values corresponding to `paths` of `object`.
       *
       * @static
       * @memberOf _
       * @since 1.0.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {...(string|string[])} [paths] The property paths to pick.
       * @returns {Array} Returns the picked values.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
       *
       * _.at(object, ['a[0].b.c', 'a[1]']);
       * // => [3, 4]
       */
      var at = flatRest(baseAt);
  
      /**
       * Creates an object that inherits from the `prototype` object. If a
       * `properties` object is given, its own enumerable string keyed properties
       * are assigned to the created object.
       *
       * @static
       * @memberOf _
       * @since 2.3.0
       * @category Object
       * @param {Object} prototype The object to inherit from.
       * @param {Object} [properties] The properties to assign to the object.
       * @returns {Object} Returns the new object.
       * @example
       *
       * function Shape() {
       *   this.x = 0;
       *   this.y = 0;
       * }
       *
       * function Circle() {
       *   Shape.call(this);
       * }
       *
       * Circle.prototype = _.create(Shape.prototype, {
       *   'constructor': Circle
       * });
       *
       * var circle = new Circle;
       * circle instanceof Circle;
       * // => true
       *
       * circle instanceof Shape;
       * // => true
       */
      function create(prototype, properties) {
        var result = baseCreate(prototype);
        return properties == null ? result : baseAssign(result, properties);
      }
  
      /**
       * Assigns own and inherited enumerable string keyed properties of source
       * objects to the destination object for all destination properties that
       * resolve to `undefined`. Source objects are applied from left to right.
       * Once a property is set, additional values of the same property are ignored.
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} [sources] The source objects.
       * @returns {Object} Returns `object`.
       * @see _.defaultsDeep
       * @example
       *
       * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
       * // => { 'a': 1, 'b': 2 }
       */
      var defaults = baseRest(function(args) {
        args.push(undefined, customDefaultsAssignIn);
        return apply(assignInWith, undefined, args);
      });
  
      /**
       * This method is like `_.defaults` except that it recursively assigns
       * default properties.
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 3.10.0
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} [sources] The source objects.
       * @returns {Object} Returns `object`.
       * @see _.defaults
       * @example
       *
       * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });
       * // => { 'a': { 'b': 2, 'c': 3 } }
       */
      var defaultsDeep = baseRest(function(args) {
        args.push(undefined, customDefaultsMerge);
        return apply(mergeWith, undefined, args);
      });
  
      /**
       * This method is like `_.find` except that it returns the key of the first
       * element `predicate` returns truthy for instead of the element itself.
       *
       * @static
       * @memberOf _
       * @since 1.1.0
       * @category Object
       * @param {Object} object The object to inspect.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {string|undefined} Returns the key of the matched element,
       *  else `undefined`.
       * @example
       *
       * var users = {
       *   'barney':  { 'age': 36, 'active': true },
       *   'fred':    { 'age': 40, 'active': false },
       *   'pebbles': { 'age': 1,  'active': true }
       * };
       *
       * _.findKey(users, function(o) { return o.age < 40; });
       * // => 'barney' (iteration order is not guaranteed)
       *
       * // The `_.matches` iteratee shorthand.
       * _.findKey(users, { 'age': 1, 'active': true });
       * // => 'pebbles'
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.findKey(users, ['active', false]);
       * // => 'fred'
       *
       * // The `_.property` iteratee shorthand.
       * _.findKey(users, 'active');
       * // => 'barney'
       */
      function findKey(object, predicate) {
        return baseFindKey(object, getIteratee(predicate, 3), baseForOwn);
      }
  
      /**
       * This method is like `_.findKey` except that it iterates over elements of
       * a collection in the opposite order.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Object
       * @param {Object} object The object to inspect.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {string|undefined} Returns the key of the matched element,
       *  else `undefined`.
       * @example
       *
       * var users = {
       *   'barney':  { 'age': 36, 'active': true },
       *   'fred':    { 'age': 40, 'active': false },
       *   'pebbles': { 'age': 1,  'active': true }
       * };
       *
       * _.findLastKey(users, function(o) { return o.age < 40; });
       * // => returns 'pebbles' assuming `_.findKey` returns 'barney'
       *
       * // The `_.matches` iteratee shorthand.
       * _.findLastKey(users, { 'age': 36, 'active': true });
       * // => 'barney'
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.findLastKey(users, ['active', false]);
       * // => 'fred'
       *
       * // The `_.property` iteratee shorthand.
       * _.findLastKey(users, 'active');
       * // => 'pebbles'
       */
      function findLastKey(object, predicate) {
        return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight);
      }
  
      /**
       * Iterates over own and inherited enumerable string keyed properties of an
       * object and invokes `iteratee` for each property. The iteratee is invoked
       * with three arguments: (value, key, object). Iteratee functions may exit
       * iteration early by explicitly returning `false`.
       *
       * @static
       * @memberOf _
       * @since 0.3.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Object} Returns `object`.
       * @see _.forInRight
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.forIn(new Foo, function(value, key) {
       *   console.log(key);
       * });
       * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed).
       */
      function forIn(object, iteratee) {
        return object == null
          ? object
          : baseFor(object, getIteratee(iteratee, 3), keysIn);
      }
  
      /**
       * This method is like `_.forIn` except that it iterates over properties of
       * `object` in the opposite order.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Object} Returns `object`.
       * @see _.forIn
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.forInRight(new Foo, function(value, key) {
       *   console.log(key);
       * });
       * // => Logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'.
       */
      function forInRight(object, iteratee) {
        return object == null
          ? object
          : baseForRight(object, getIteratee(iteratee, 3), keysIn);
      }
  
      /**
       * Iterates over own enumerable string keyed properties of an object and
       * invokes `iteratee` for each property. The iteratee is invoked with three
       * arguments: (value, key, object). Iteratee functions may exit iteration
       * early by explicitly returning `false`.
       *
       * @static
       * @memberOf _
       * @since 0.3.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Object} Returns `object`.
       * @see _.forOwnRight
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.forOwn(new Foo, function(value, key) {
       *   console.log(key);
       * });
       * // => Logs 'a' then 'b' (iteration order is not guaranteed).
       */
      function forOwn(object, iteratee) {
        return object && baseForOwn(object, getIteratee(iteratee, 3));
      }
  
      /**
       * This method is like `_.forOwn` except that it iterates over properties of
       * `object` in the opposite order.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Object} Returns `object`.
       * @see _.forOwn
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.forOwnRight(new Foo, function(value, key) {
       *   console.log(key);
       * });
       * // => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'.
       */
      function forOwnRight(object, iteratee) {
        return object && baseForOwnRight(object, getIteratee(iteratee, 3));
      }
  
      /**
       * Creates an array of function property names from own enumerable properties
       * of `object`.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The object to inspect.
       * @returns {Array} Returns the function names.
       * @see _.functionsIn
       * @example
       *
       * function Foo() {
       *   this.a = _.constant('a');
       *   this.b = _.constant('b');
       * }
       *
       * Foo.prototype.c = _.constant('c');
       *
       * _.functions(new Foo);
       * // => ['a', 'b']
       */
      function functions(object) {
        return object == null ? [] : baseFunctions(object, keys(object));
      }
  
      /**
       * Creates an array of function property names from own and inherited
       * enumerable properties of `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The object to inspect.
       * @returns {Array} Returns the function names.
       * @see _.functions
       * @example
       *
       * function Foo() {
       *   this.a = _.constant('a');
       *   this.b = _.constant('b');
       * }
       *
       * Foo.prototype.c = _.constant('c');
       *
       * _.functionsIn(new Foo);
       * // => ['a', 'b', 'c']
       */
      function functionsIn(object) {
        return object == null ? [] : baseFunctions(object, keysIn(object));
      }
  
      /**
       * Gets the value at `path` of `object`. If the resolved value is
       * `undefined`, the `defaultValue` is returned in its place.
       *
       * @static
       * @memberOf _
       * @since 3.7.0
       * @category Object
       * @param {Object} object The object to query.
       * @param {Array|string} path The path of the property to get.
       * @param {*} [defaultValue] The value returned for `undefined` resolved values.
       * @returns {*} Returns the resolved value.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': 3 } }] };
       *
       * _.get(object, 'a[0].b.c');
       * // => 3
       *
       * _.get(object, ['a', '0', 'b', 'c']);
       * // => 3
       *
       * _.get(object, 'a.b.c', 'default');
       * // => 'default'
       */
      function get(object, path, defaultValue) {
        var result = object == null ? undefined : baseGet(object, path);
        return result === undefined ? defaultValue : result;
      }
  
      /**
       * Checks if `path` is a direct property of `object`.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The object to query.
       * @param {Array|string} path The path to check.
       * @returns {boolean} Returns `true` if `path` exists, else `false`.
       * @example
       *
       * var object = { 'a': { 'b': 2 } };
       * var other = _.create({ 'a': _.create({ 'b': 2 }) });
       *
       * _.has(object, 'a');
       * // => true
       *
       * _.has(object, 'a.b');
       * // => true
       *
       * _.has(object, ['a', 'b']);
       * // => true
       *
       * _.has(other, 'a');
       * // => false
       */
      function has(object, path) {
        return object != null && hasPath(object, path, baseHas);
      }
  
      /**
       * Checks if `path` is a direct or inherited property of `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The object to query.
       * @param {Array|string} path The path to check.
       * @returns {boolean} Returns `true` if `path` exists, else `false`.
       * @example
       *
       * var object = _.create({ 'a': _.create({ 'b': 2 }) });
       *
       * _.hasIn(object, 'a');
       * // => true
       *
       * _.hasIn(object, 'a.b');
       * // => true
       *
       * _.hasIn(object, ['a', 'b']);
       * // => true
       *
       * _.hasIn(object, 'b');
       * // => false
       */
      function hasIn(object, path) {
        return object != null && hasPath(object, path, baseHasIn);
      }
  
      /**
       * Creates an object composed of the inverted keys and values of `object`.
       * If `object` contains duplicate values, subsequent values overwrite
       * property assignments of previous values.
       *
       * @static
       * @memberOf _
       * @since 0.7.0
       * @category Object
       * @param {Object} object The object to invert.
       * @returns {Object} Returns the new inverted object.
       * @example
       *
       * var object = { 'a': 1, 'b': 2, 'c': 1 };
       *
       * _.invert(object);
       * // => { '1': 'c', '2': 'b' }
       */
      var invert = createInverter(function(result, value, key) {
        result[value] = key;
      }, constant(identity));
  
      /**
       * This method is like `_.invert` except that the inverted object is generated
       * from the results of running each element of `object` thru `iteratee`. The
       * corresponding inverted value of each inverted key is an array of keys
       * responsible for generating the inverted value. The iteratee is invoked
       * with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.1.0
       * @category Object
       * @param {Object} object The object to invert.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Object} Returns the new inverted object.
       * @example
       *
       * var object = { 'a': 1, 'b': 2, 'c': 1 };
       *
       * _.invertBy(object);
       * // => { '1': ['a', 'c'], '2': ['b'] }
       *
       * _.invertBy(object, function(value) {
       *   return 'group' + value;
       * });
       * // => { 'group1': ['a', 'c'], 'group2': ['b'] }
       */
      var invertBy = createInverter(function(result, value, key) {
        if (hasOwnProperty.call(result, value)) {
          result[value].push(key);
        } else {
          result[value] = [key];
        }
      }, getIteratee);
  
      /**
       * Invokes the method at `path` of `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The object to query.
       * @param {Array|string} path The path of the method to invoke.
       * @param {...*} [args] The arguments to invoke the method with.
       * @returns {*} Returns the result of the invoked method.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] };
       *
       * _.invoke(object, 'a[0].b.c.slice', 1, 3);
       * // => [2, 3]
       */
      var invoke = baseRest(baseInvoke);
  
      /**
       * Creates an array of the own enumerable property names of `object`.
       *
       * **Note:** Non-object values are coerced to objects. See the
       * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
       * for more details.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.keys(new Foo);
       * // => ['a', 'b'] (iteration order is not guaranteed)
       *
       * _.keys('hi');
       * // => ['0', '1']
       */
      function keys(object) {
        return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
      }
  
      /**
       * Creates an array of the own and inherited enumerable property names of `object`.
       *
       * **Note:** Non-object values are coerced to objects.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Object
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.keysIn(new Foo);
       * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
       */
      function keysIn(object) {
        return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);
      }
  
      /**
       * The opposite of `_.mapValues`; this method creates an object with the
       * same values as `object` and keys generated by running each own enumerable
       * string keyed property of `object` thru `iteratee`. The iteratee is invoked
       * with three arguments: (value, key, object).
       *
       * @static
       * @memberOf _
       * @since 3.8.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Object} Returns the new mapped object.
       * @see _.mapValues
       * @example
       *
       * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
       *   return key + value;
       * });
       * // => { 'a1': 1, 'b2': 2 }
       */
      function mapKeys(object, iteratee) {
        var result = {};
        iteratee = getIteratee(iteratee, 3);
  
        baseForOwn(object, function(value, key, object) {
          baseAssignValue(result, iteratee(value, key, object), value);
        });
        return result;
      }
  
      /**
       * Creates an object with the same keys as `object` and values generated
       * by running each own enumerable string keyed property of `object` thru
       * `iteratee`. The iteratee is invoked with three arguments:
       * (value, key, object).
       *
       * @static
       * @memberOf _
       * @since 2.4.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Object} Returns the new mapped object.
       * @see _.mapKeys
       * @example
       *
       * var users = {
       *   'fred':    { 'user': 'fred',    'age': 40 },
       *   'pebbles': { 'user': 'pebbles', 'age': 1 }
       * };
       *
       * _.mapValues(users, function(o) { return o.age; });
       * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
       *
       * // The `_.property` iteratee shorthand.
       * _.mapValues(users, 'age');
       * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
       */
      function mapValues(object, iteratee) {
        var result = {};
        iteratee = getIteratee(iteratee, 3);
  
        baseForOwn(object, function(value, key, object) {
          baseAssignValue(result, key, iteratee(value, key, object));
        });
        return result;
      }
  
      /**
       * This method is like `_.assign` except that it recursively merges own and
       * inherited enumerable string keyed properties of source objects into the
       * destination object. Source properties that resolve to `undefined` are
       * skipped if a destination value exists. Array and plain object properties
       * are merged recursively. Other objects and value types are overridden by
       * assignment. Source objects are applied from left to right. Subsequent
       * sources overwrite property assignments of previous sources.
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 0.5.0
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} [sources] The source objects.
       * @returns {Object} Returns `object`.
       * @example
       *
       * var object = {
       *   'a': [{ 'b': 2 }, { 'd': 4 }]
       * };
       *
       * var other = {
       *   'a': [{ 'c': 3 }, { 'e': 5 }]
       * };
       *
       * _.merge(object, other);
       * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }
       */
      var merge = createAssigner(function(object, source, srcIndex) {
        baseMerge(object, source, srcIndex);
      });
  
      /**
       * This method is like `_.merge` except that it accepts `customizer` which
       * is invoked to produce the merged values of the destination and source
       * properties. If `customizer` returns `undefined`, merging is handled by the
       * method instead. The `customizer` is invoked with six arguments:
       * (objValue, srcValue, key, object, source, stack).
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} sources The source objects.
       * @param {Function} customizer The function to customize assigned values.
       * @returns {Object} Returns `object`.
       * @example
       *
       * function customizer(objValue, srcValue) {
       *   if (_.isArray(objValue)) {
       *     return objValue.concat(srcValue);
       *   }
       * }
       *
       * var object = { 'a': [1], 'b': [2] };
       * var other = { 'a': [3], 'b': [4] };
       *
       * _.mergeWith(object, other, customizer);
       * // => { 'a': [1, 3], 'b': [2, 4] }
       */
      var mergeWith = createAssigner(function(object, source, srcIndex, customizer) {
        baseMerge(object, source, srcIndex, customizer);
      });
  
      /**
       * The opposite of `_.pick`; this method creates an object composed of the
       * own and inherited enumerable property paths of `object` that are not omitted.
       *
       * **Note:** This method is considerably slower than `_.pick`.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The source object.
       * @param {...(string|string[])} [paths] The property paths to omit.
       * @returns {Object} Returns the new object.
       * @example
       *
       * var object = { 'a': 1, 'b': '2', 'c': 3 };
       *
       * _.omit(object, ['a', 'c']);
       * // => { 'b': '2' }
       */
      var omit = flatRest(function(object, paths) {
        var result = {};
        if (object == null) {
          return result;
        }
        var isDeep = false;
        paths = arrayMap(paths, function(path) {
          path = castPath(path, object);
          isDeep || (isDeep = path.length > 1);
          return path;
        });
        copyObject(object, getAllKeysIn(object), result);
        if (isDeep) {
          result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone);
        }
        var length = paths.length;
        while (length--) {
          baseUnset(result, paths[length]);
        }
        return result;
      });
  
      /**
       * The opposite of `_.pickBy`; this method creates an object composed of
       * the own and inherited enumerable string keyed properties of `object` that
       * `predicate` doesn't return truthy for. The predicate is invoked with two
       * arguments: (value, key).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The source object.
       * @param {Function} [predicate=_.identity] The function invoked per property.
       * @returns {Object} Returns the new object.
       * @example
       *
       * var object = { 'a': 1, 'b': '2', 'c': 3 };
       *
       * _.omitBy(object, _.isNumber);
       * // => { 'b': '2' }
       */
      function omitBy(object, predicate) {
        return pickBy(object, negate(getIteratee(predicate)));
      }
  
      /**
       * Creates an object composed of the picked `object` properties.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The source object.
       * @param {...(string|string[])} [paths] The property paths to pick.
       * @returns {Object} Returns the new object.
       * @example
       *
       * var object = { 'a': 1, 'b': '2', 'c': 3 };
       *
       * _.pick(object, ['a', 'c']);
       * // => { 'a': 1, 'c': 3 }
       */
      var pick = flatRest(function(object, paths) {
        return object == null ? {} : basePick(object, paths);
      });
  
      /**
       * Creates an object composed of the `object` properties `predicate` returns
       * truthy for. The predicate is invoked with two arguments: (value, key).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The source object.
       * @param {Function} [predicate=_.identity] The function invoked per property.
       * @returns {Object} Returns the new object.
       * @example
       *
       * var object = { 'a': 1, 'b': '2', 'c': 3 };
       *
       * _.pickBy(object, _.isNumber);
       * // => { 'a': 1, 'c': 3 }
       */
      function pickBy(object, predicate) {
        if (object == null) {
          return {};
        }
        var props = arrayMap(getAllKeysIn(object), function(prop) {
          return [prop];
        });
        predicate = getIteratee(predicate);
        return basePickBy(object, props, function(value, path) {
          return predicate(value, path[0]);
        });
      }
  
      /**
       * This method is like `_.get` except that if the resolved value is a
       * function it's invoked with the `this` binding of its parent object and
       * its result is returned.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The object to query.
       * @param {Array|string} path The path of the property to resolve.
       * @param {*} [defaultValue] The value returned for `undefined` resolved values.
       * @returns {*} Returns the resolved value.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
       *
       * _.result(object, 'a[0].b.c1');
       * // => 3
       *
       * _.result(object, 'a[0].b.c2');
       * // => 4
       *
       * _.result(object, 'a[0].b.c3', 'default');
       * // => 'default'
       *
       * _.result(object, 'a[0].b.c3', _.constant('default'));
       * // => 'default'
       */
      function result(object, path, defaultValue) {
        path = castPath(path, object);
  
        var index = -1,
            length = path.length;
  
        // Ensure the loop is entered when path is empty.
        if (!length) {
          length = 1;
          object = undefined;
        }
        while (++index < length) {
          var value = object == null ? undefined : object[toKey(path[index])];
          if (value === undefined) {
            index = length;
            value = defaultValue;
          }
          object = isFunction(value) ? value.call(object) : value;
        }
        return object;
      }
  
      /**
       * Sets the value at `path` of `object`. If a portion of `path` doesn't exist,
       * it's created. Arrays are created for missing index properties while objects
       * are created for all other missing properties. Use `_.setWith` to customize
       * `path` creation.
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 3.7.0
       * @category Object
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to set.
       * @param {*} value The value to set.
       * @returns {Object} Returns `object`.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': 3 } }] };
       *
       * _.set(object, 'a[0].b.c', 4);
       * console.log(object.a[0].b.c);
       * // => 4
       *
       * _.set(object, ['x', '0', 'y', 'z'], 5);
       * console.log(object.x[0].y.z);
       * // => 5
       */
      function set(object, path, value) {
        return object == null ? object : baseSet(object, path, value);
      }
  
      /**
       * This method is like `_.set` except that it accepts `customizer` which is
       * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
       * path creation is handled by the method instead. The `customizer` is invoked
       * with three arguments: (nsValue, key, nsObject).
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to set.
       * @param {*} value The value to set.
       * @param {Function} [customizer] The function to customize assigned values.
       * @returns {Object} Returns `object`.
       * @example
       *
       * var object = {};
       *
       * _.setWith(object, '[0][1]', 'a', Object);
       * // => { '0': { '1': 'a' } }
       */
      function setWith(object, path, value, customizer) {
        customizer = typeof customizer == 'function' ? customizer : undefined;
        return object == null ? object : baseSet(object, path, value, customizer);
      }
  
      /**
       * Creates an array of own enumerable string keyed-value pairs for `object`
       * which can be consumed by `_.fromPairs`. If `object` is a map or set, its
       * entries are returned.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @alias entries
       * @category Object
       * @param {Object} object The object to query.
       * @returns {Array} Returns the key-value pairs.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.toPairs(new Foo);
       * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed)
       */
      var toPairs = createToPairs(keys);
  
      /**
       * Creates an array of own and inherited enumerable string keyed-value pairs
       * for `object` which can be consumed by `_.fromPairs`. If `object` is a map
       * or set, its entries are returned.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @alias entriesIn
       * @category Object
       * @param {Object} object The object to query.
       * @returns {Array} Returns the key-value pairs.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.toPairsIn(new Foo);
       * // => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed)
       */
      var toPairsIn = createToPairs(keysIn);
  
      /**
       * An alternative to `_.reduce`; this method transforms `object` to a new
       * `accumulator` object which is the result of running each of its own
       * enumerable string keyed properties thru `iteratee`, with each invocation
       * potentially mutating the `accumulator` object. If `accumulator` is not
       * provided, a new object with the same `[[Prototype]]` will be used. The
       * iteratee is invoked with four arguments: (accumulator, value, key, object).
       * Iteratee functions may exit iteration early by explicitly returning `false`.
       *
       * @static
       * @memberOf _
       * @since 1.3.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @param {*} [accumulator] The custom accumulator value.
       * @returns {*} Returns the accumulated value.
       * @example
       *
       * _.transform([2, 3, 4], function(result, n) {
       *   result.push(n *= n);
       *   return n % 2 == 0;
       * }, []);
       * // => [4, 9]
       *
       * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
       *   (result[value] || (result[value] = [])).push(key);
       * }, {});
       * // => { '1': ['a', 'c'], '2': ['b'] }
       */
      function transform(object, iteratee, accumulator) {
        var isArr = isArray(object),
            isArrLike = isArr || isBuffer(object) || isTypedArray(object);
  
        iteratee = getIteratee(iteratee, 4);
        if (accumulator == null) {
          var Ctor = object && object.constructor;
          if (isArrLike) {
            accumulator = isArr ? new Ctor : [];
          }
          else if (isObject(object)) {
            accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};
          }
          else {
            accumulator = {};
          }
        }
        (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) {
          return iteratee(accumulator, value, index, object);
        });
        return accumulator;
      }
  
      /**
       * Removes the property at `path` of `object`.
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to unset.
       * @returns {boolean} Returns `true` if the property is deleted, else `false`.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': 7 } }] };
       * _.unset(object, 'a[0].b.c');
       * // => true
       *
       * console.log(object);
       * // => { 'a': [{ 'b': {} }] };
       *
       * _.unset(object, ['a', '0', 'b', 'c']);
       * // => true
       *
       * console.log(object);
       * // => { 'a': [{ 'b': {} }] };
       */
      function unset(object, path) {
        return object == null ? true : baseUnset(object, path);
      }
  
      /**
       * This method is like `_.set` except that accepts `updater` to produce the
       * value to set. Use `_.updateWith` to customize `path` creation. The `updater`
       * is invoked with one argument: (value).
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.6.0
       * @category Object
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to set.
       * @param {Function} updater The function to produce the updated value.
       * @returns {Object} Returns `object`.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': 3 } }] };
       *
       * _.update(object, 'a[0].b.c', function(n) { return n * n; });
       * console.log(object.a[0].b.c);
       * // => 9
       *
       * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });
       * console.log(object.x[0].y.z);
       * // => 0
       */
      function update(object, path, updater) {
        return object == null ? object : baseUpdate(object, path, castFunction(updater));
      }
  
      /**
       * This method is like `_.update` except that it accepts `customizer` which is
       * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
       * path creation is handled by the method instead. The `customizer` is invoked
       * with three arguments: (nsValue, key, nsObject).
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.6.0
       * @category Object
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to set.
       * @param {Function} updater The function to produce the updated value.
       * @param {Function} [customizer] The function to customize assigned values.
       * @returns {Object} Returns `object`.
       * @example
       *
       * var object = {};
       *
       * _.updateWith(object, '[0][1]', _.constant('a'), Object);
       * // => { '0': { '1': 'a' } }
       */
      function updateWith(object, path, updater, customizer) {
        customizer = typeof customizer == 'function' ? customizer : undefined;
        return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer);
      }
  
      /**
       * Creates an array of the own enumerable string keyed property values of `object`.
       *
       * **Note:** Non-object values are coerced to objects.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property values.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.values(new Foo);
       * // => [1, 2] (iteration order is not guaranteed)
       *
       * _.values('hi');
       * // => ['h', 'i']
       */
      function values(object) {
        return object == null ? [] : baseValues(object, keys(object));
      }
  
      /**
       * Creates an array of the own and inherited enumerable string keyed property
       * values of `object`.
       *
       * **Note:** Non-object values are coerced to objects.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Object
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property values.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.valuesIn(new Foo);
       * // => [1, 2, 3] (iteration order is not guaranteed)
       */
      function valuesIn(object) {
        return object == null ? [] : baseValues(object, keysIn(object));
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Clamps `number` within the inclusive `lower` and `upper` bounds.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Number
       * @param {number} number The number to clamp.
       * @param {number} [lower] The lower bound.
       * @param {number} upper The upper bound.
       * @returns {number} Returns the clamped number.
       * @example
       *
       * _.clamp(-10, -5, 5);
       * // => -5
       *
       * _.clamp(10, -5, 5);
       * // => 5
       */
      function clamp(number, lower, upper) {
        if (upper === undefined) {
          upper = lower;
          lower = undefined;
        }
        if (upper !== undefined) {
          upper = toNumber(upper);
          upper = upper === upper ? upper : 0;
        }
        if (lower !== undefined) {
          lower = toNumber(lower);
          lower = lower === lower ? lower : 0;
        }
        return baseClamp(toNumber(number), lower, upper);
      }
  
      /**
       * Checks if `n` is between `start` and up to, but not including, `end`. If
       * `end` is not specified, it's set to `start` with `start` then set to `0`.
       * If `start` is greater than `end` the params are swapped to support
       * negative ranges.
       *
       * @static
       * @memberOf _
       * @since 3.3.0
       * @category Number
       * @param {number} number The number to check.
       * @param {number} [start=0] The start of the range.
       * @param {number} end The end of the range.
       * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
       * @see _.range, _.rangeRight
       * @example
       *
       * _.inRange(3, 2, 4);
       * // => true
       *
       * _.inRange(4, 8);
       * // => true
       *
       * _.inRange(4, 2);
       * // => false
       *
       * _.inRange(2, 2);
       * // => false
       *
       * _.inRange(1.2, 2);
       * // => true
       *
       * _.inRange(5.2, 4);
       * // => false
       *
       * _.inRange(-3, -2, -6);
       * // => true
       */
      function inRange(number, start, end) {
        start = toFinite(start);
        if (end === undefined) {
          end = start;
          start = 0;
        } else {
          end = toFinite(end);
        }
        number = toNumber(number);
        return baseInRange(number, start, end);
      }
  
      /**
       * Produces a random number between the inclusive `lower` and `upper` bounds.
       * If only one argument is provided a number between `0` and the given number
       * is returned. If `floating` is `true`, or either `lower` or `upper` are
       * floats, a floating-point number is returned instead of an integer.
       *
       * **Note:** JavaScript follows the IEEE-754 standard for resolving
       * floating-point values which can produce unexpected results.
       *
       * @static
       * @memberOf _
       * @since 0.7.0
       * @category Number
       * @param {number} [lower=0] The lower bound.
       * @param {number} [upper=1] The upper bound.
       * @param {boolean} [floating] Specify returning a floating-point number.
       * @returns {number} Returns the random number.
       * @example
       *
       * _.random(0, 5);
       * // => an integer between 0 and 5
       *
       * _.random(5);
       * // => also an integer between 0 and 5
       *
       * _.random(5, true);
       * // => a floating-point number between 0 and 5
       *
       * _.random(1.2, 5.2);
       * // => a floating-point number between 1.2 and 5.2
       */
      function random(lower, upper, floating) {
        if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {
          upper = floating = undefined;
        }
        if (floating === undefined) {
          if (typeof upper == 'boolean') {
            floating = upper;
            upper = undefined;
          }
          else if (typeof lower == 'boolean') {
            floating = lower;
            lower = undefined;
          }
        }
        if (lower === undefined && upper === undefined) {
          lower = 0;
          upper = 1;
        }
        else {
          lower = toFinite(lower);
          if (upper === undefined) {
            upper = lower;
            lower = 0;
          } else {
            upper = toFinite(upper);
          }
        }
        if (lower > upper) {
          var temp = lower;
          lower = upper;
          upper = temp;
        }
        if (floating || lower % 1 || upper % 1) {
          var rand = nativeRandom();
          return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper);
        }
        return baseRandom(lower, upper);
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the camel cased string.
       * @example
       *
       * _.camelCase('Foo Bar');
       * // => 'fooBar'
       *
       * _.camelCase('--foo-bar--');
       * // => 'fooBar'
       *
       * _.camelCase('__FOO_BAR__');
       * // => 'fooBar'
       */
      var camelCase = createCompounder(function(result, word, index) {
        word = word.toLowerCase();
        return result + (index ? capitalize(word) : word);
      });
  
      /**
       * Converts the first character of `string` to upper case and the remaining
       * to lower case.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to capitalize.
       * @returns {string} Returns the capitalized string.
       * @example
       *
       * _.capitalize('FRED');
       * // => 'Fred'
       */
      function capitalize(string) {
        return upperFirst(toString(string).toLowerCase());
      }
  
      /**
       * Deburrs `string` by converting
       * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
       * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A)
       * letters to basic Latin letters and removing
       * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to deburr.
       * @returns {string} Returns the deburred string.
       * @example
       *
       * _.deburr('déjà vu');
       * // => 'deja vu'
       */
      function deburr(string) {
        string = toString(string);
        return string && string.replace(reLatin, deburrLetter).replace(reComboMark, '');
      }
  
      /**
       * Checks if `string` ends with the given target string.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to inspect.
       * @param {string} [target] The string to search for.
       * @param {number} [position=string.length] The position to search up to.
       * @returns {boolean} Returns `true` if `string` ends with `target`,
       *  else `false`.
       * @example
       *
       * _.endsWith('abc', 'c');
       * // => true
       *
       * _.endsWith('abc', 'b');
       * // => false
       *
       * _.endsWith('abc', 'b', 2);
       * // => true
       */
      function endsWith(string, target, position) {
        string = toString(string);
        target = baseToString(target);
  
        var length = string.length;
        position = position === undefined
          ? length
          : baseClamp(toInteger(position), 0, length);
  
        var end = position;
        position -= target.length;
        return position >= 0 && string.slice(position, end) == target;
      }
  
      /**
       * Converts the characters "&", "<", ">", '"', and "'" in `string` to their
       * corresponding HTML entities.
       *
       * **Note:** No other characters are escaped. To escape additional
       * characters use a third-party library like [_he_](https://mths.be/he).
       *
       * Though the ">" character is escaped for symmetry, characters like
       * ">" and "/" don't need escaping in HTML and have no special meaning
       * unless they're part of a tag or unquoted attribute value. See
       * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
       * (under "semi-related fun fact") for more details.
       *
       * When working with HTML you should always
       * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
       * XSS vectors.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category String
       * @param {string} [string=''] The string to escape.
       * @returns {string} Returns the escaped string.
       * @example
       *
       * _.escape('fred, barney, & pebbles');
       * // => 'fred, barney, &amp; pebbles'
       */
      function escape(string) {
        string = toString(string);
        return (string && reHasUnescapedHtml.test(string))
          ? string.replace(reUnescapedHtml, escapeHtmlChar)
          : string;
      }
  
      /**
       * Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+",
       * "?", "(", ")", "[", "]", "{", "}", and "|" in `string`.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to escape.
       * @returns {string} Returns the escaped string.
       * @example
       *
       * _.escapeRegExp('[lodash](https://lodash.com/)');
       * // => '\[lodash\]\(https://lodash\.com/\)'
       */
      function escapeRegExp(string) {
        string = toString(string);
        return (string && reHasRegExpChar.test(string))
          ? string.replace(reRegExpChar, '\\$&')
          : string;
      }
  
      /**
       * Converts `string` to
       * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the kebab cased string.
       * @example
       *
       * _.kebabCase('Foo Bar');
       * // => 'foo-bar'
       *
       * _.kebabCase('fooBar');
       * // => 'foo-bar'
       *
       * _.kebabCase('__FOO_BAR__');
       * // => 'foo-bar'
       */
      var kebabCase = createCompounder(function(result, word, index) {
        return result + (index ? '-' : '') + word.toLowerCase();
      });
  
      /**
       * Converts `string`, as space separated words, to lower case.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the lower cased string.
       * @example
       *
       * _.lowerCase('--Foo-Bar--');
       * // => 'foo bar'
       *
       * _.lowerCase('fooBar');
       * // => 'foo bar'
       *
       * _.lowerCase('__FOO_BAR__');
       * // => 'foo bar'
       */
      var lowerCase = createCompounder(function(result, word, index) {
        return result + (index ? ' ' : '') + word.toLowerCase();
      });
  
      /**
       * Converts the first character of `string` to lower case.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the converted string.
       * @example
       *
       * _.lowerFirst('Fred');
       * // => 'fred'
       *
       * _.lowerFirst('FRED');
       * // => 'fRED'
       */
      var lowerFirst = createCaseFirst('toLowerCase');
  
      /**
       * Pads `string` on the left and right sides if it's shorter than `length`.
       * Padding characters are truncated if they can't be evenly divided by `length`.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to pad.
       * @param {number} [length=0] The padding length.
       * @param {string} [chars=' '] The string used as padding.
       * @returns {string} Returns the padded string.
       * @example
       *
       * _.pad('abc', 8);
       * // => '  abc   '
       *
       * _.pad('abc', 8, '_-');
       * // => '_-abc_-_'
       *
       * _.pad('abc', 3);
       * // => 'abc'
       */
      function pad(string, length, chars) {
        string = toString(string);
        length = toInteger(length);
  
        var strLength = length ? stringSize(string) : 0;
        if (!length || strLength >= length) {
          return string;
        }
        var mid = (length - strLength) / 2;
        return (
          createPadding(nativeFloor(mid), chars) +
          string +
          createPadding(nativeCeil(mid), chars)
        );
      }
  
      /**
       * Pads `string` on the right side if it's shorter than `length`. Padding
       * characters are truncated if they exceed `length`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to pad.
       * @param {number} [length=0] The padding length.
       * @param {string} [chars=' '] The string used as padding.
       * @returns {string} Returns the padded string.
       * @example
       *
       * _.padEnd('abc', 6);
       * // => 'abc   '
       *
       * _.padEnd('abc', 6, '_-');
       * // => 'abc_-_'
       *
       * _.padEnd('abc', 3);
       * // => 'abc'
       */
      function padEnd(string, length, chars) {
        string = toString(string);
        length = toInteger(length);
  
        var strLength = length ? stringSize(string) : 0;
        return (length && strLength < length)
          ? (string + createPadding(length - strLength, chars))
          : string;
      }
  
      /**
       * Pads `string` on the left side if it's shorter than `length`. Padding
       * characters are truncated if they exceed `length`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to pad.
       * @param {number} [length=0] The padding length.
       * @param {string} [chars=' '] The string used as padding.
       * @returns {string} Returns the padded string.
       * @example
       *
       * _.padStart('abc', 6);
       * // => '   abc'
       *
       * _.padStart('abc', 6, '_-');
       * // => '_-_abc'
       *
       * _.padStart('abc', 3);
       * // => 'abc'
       */
      function padStart(string, length, chars) {
        string = toString(string);
        length = toInteger(length);
  
        var strLength = length ? stringSize(string) : 0;
        return (length && strLength < length)
          ? (createPadding(length - strLength, chars) + string)
          : string;
      }
  
      /**
       * Converts `string` to an integer of the specified radix. If `radix` is
       * `undefined` or `0`, a `radix` of `10` is used unless `value` is a
       * hexadecimal, in which case a `radix` of `16` is used.
       *
       * **Note:** This method aligns with the
       * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`.
       *
       * @static
       * @memberOf _
       * @since 1.1.0
       * @category String
       * @param {string} string The string to convert.
       * @param {number} [radix=10] The radix to interpret `value` by.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {number} Returns the converted integer.
       * @example
       *
       * _.parseInt('08');
       * // => 8
       *
       * _.map(['6', '08', '10'], _.parseInt);
       * // => [6, 8, 10]
       */
      function parseInt(string, radix, guard) {
        if (guard || radix == null) {
          radix = 0;
        } else if (radix) {
          radix = +radix;
        }
        return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0);
      }
  
      /**
       * Repeats the given string `n` times.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to repeat.
       * @param {number} [n=1] The number of times to repeat the string.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {string} Returns the repeated string.
       * @example
       *
       * _.repeat('*', 3);
       * // => '***'
       *
       * _.repeat('abc', 2);
       * // => 'abcabc'
       *
       * _.repeat('abc', 0);
       * // => ''
       */
      function repeat(string, n, guard) {
        if ((guard ? isIterateeCall(string, n, guard) : n === undefined)) {
          n = 1;
        } else {
          n = toInteger(n);
        }
        return baseRepeat(toString(string), n);
      }
  
      /**
       * Replaces matches for `pattern` in `string` with `replacement`.
       *
       * **Note:** This method is based on
       * [`String#replace`](https://mdn.io/String/replace).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to modify.
       * @param {RegExp|string} pattern The pattern to replace.
       * @param {Function|string} replacement The match replacement.
       * @returns {string} Returns the modified string.
       * @example
       *
       * _.replace('Hi Fred', 'Fred', 'Barney');
       * // => 'Hi Barney'
       */
      function replace() {
        var args = arguments,
            string = toString(args[0]);
  
        return args.length < 3 ? string : string.replace(args[1], args[2]);
      }
  
      /**
       * Converts `string` to
       * [snake case](https://en.wikipedia.org/wiki/Snake_case).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the snake cased string.
       * @example
       *
       * _.snakeCase('Foo Bar');
       * // => 'foo_bar'
       *
       * _.snakeCase('fooBar');
       * // => 'foo_bar'
       *
       * _.snakeCase('--FOO-BAR--');
       * // => 'foo_bar'
       */
      var snakeCase = createCompounder(function(result, word, index) {
        return result + (index ? '_' : '') + word.toLowerCase();
      });
  
      /**
       * Splits `string` by `separator`.
       *
       * **Note:** This method is based on
       * [`String#split`](https://mdn.io/String/split).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to split.
       * @param {RegExp|string} separator The separator pattern to split by.
       * @param {number} [limit] The length to truncate results to.
       * @returns {Array} Returns the string segments.
       * @example
       *
       * _.split('a-b-c', '-', 2);
       * // => ['a', 'b']
       */
      function split(string, separator, limit) {
        if (limit && typeof limit != 'number' && isIterateeCall(string, separator, limit)) {
          separator = limit = undefined;
        }
        limit = limit === undefined ? MAX_ARRAY_LENGTH : limit >>> 0;
        if (!limit) {
          return [];
        }
        string = toString(string);
        if (string && (
              typeof separator == 'string' ||
              (separator != null && !isRegExp(separator))
            )) {
          separator = baseToString(separator);
          if (!separator && hasUnicode(string)) {
            return castSlice(stringToArray(string), 0, limit);
          }
        }
        return string.split(separator, limit);
      }
  
      /**
       * Converts `string` to
       * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).
       *
       * @static
       * @memberOf _
       * @since 3.1.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the start cased string.
       * @example
       *
       * _.startCase('--foo-bar--');
       * // => 'Foo Bar'
       *
       * _.startCase('fooBar');
       * // => 'Foo Bar'
       *
       * _.startCase('__FOO_BAR__');
       * // => 'FOO BAR'
       */
      var startCase = createCompounder(function(result, word, index) {
        return result + (index ? ' ' : '') + upperFirst(word);
      });
  
      /**
       * Checks if `string` starts with the given target string.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to inspect.
       * @param {string} [target] The string to search for.
       * @param {number} [position=0] The position to search from.
       * @returns {boolean} Returns `true` if `string` starts with `target`,
       *  else `false`.
       * @example
       *
       * _.startsWith('abc', 'a');
       * // => true
       *
       * _.startsWith('abc', 'b');
       * // => false
       *
       * _.startsWith('abc', 'b', 1);
       * // => true
       */
      function startsWith(string, target, position) {
        string = toString(string);
        position = position == null
          ? 0
          : baseClamp(toInteger(position), 0, string.length);
  
        target = baseToString(target);
        return string.slice(position, position + target.length) == target;
      }
  
      /**
       * Creates a compiled template function that can interpolate data properties
       * in "interpolate" delimiters, HTML-escape interpolated data properties in
       * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
       * properties may be accessed as free variables in the template. If a setting
       * object is given, it takes precedence over `_.templateSettings` values.
       *
       * **Note:** In the development build `_.template` utilizes
       * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
       * for easier debugging.
       *
       * For more information on precompiling templates see
       * [lodash's custom builds documentation](https://lodash.com/custom-builds).
       *
       * For more information on Chrome extension sandboxes see
       * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category String
       * @param {string} [string=''] The template string.
       * @param {Object} [options={}] The options object.
       * @param {RegExp} [options.escape=_.templateSettings.escape]
       *  The HTML "escape" delimiter.
       * @param {RegExp} [options.evaluate=_.templateSettings.evaluate]
       *  The "evaluate" delimiter.
       * @param {Object} [options.imports=_.templateSettings.imports]
       *  An object to import into the template as free variables.
       * @param {RegExp} [options.interpolate=_.templateSettings.interpolate]
       *  The "interpolate" delimiter.
       * @param {string} [options.sourceURL='lodash.templateSources[n]']
       *  The sourceURL of the compiled template.
       * @param {string} [options.variable='obj']
       *  The data object variable name.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Function} Returns the compiled template function.
       * @example
       *
       * // Use the "interpolate" delimiter to create a compiled template.
       * var compiled = _.template('hello <%= user %>!');
       * compiled({ 'user': 'fred' });
       * // => 'hello fred!'
       *
       * // Use the HTML "escape" delimiter to escape data property values.
       * var compiled = _.template('<b><%- value %></b>');
       * compiled({ 'value': '<script>' });
       * // => '<b>&lt;script&gt;</b>'
       *
       * // Use the "evaluate" delimiter to execute JavaScript and generate HTML.
       * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
       * compiled({ 'users': ['fred', 'barney'] });
       * // => '<li>fred</li><li>barney</li>'
       *
       * // Use the internal `print` function in "evaluate" delimiters.
       * var compiled = _.template('<% print("hello " + user); %>!');
       * compiled({ 'user': 'barney' });
       * // => 'hello barney!'
       *
       * // Use the ES template literal delimiter as an "interpolate" delimiter.
       * // Disable support by replacing the "interpolate" delimiter.
       * var compiled = _.template('hello ${ user }!');
       * compiled({ 'user': 'pebbles' });
       * // => 'hello pebbles!'
       *
       * // Use backslashes to treat delimiters as plain text.
       * var compiled = _.template('<%= "\\<%- value %\\>" %>');
       * compiled({ 'value': 'ignored' });
       * // => '<%- value %>'
       *
       * // Use the `imports` option to import `jQuery` as `jq`.
       * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
       * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
       * compiled({ 'users': ['fred', 'barney'] });
       * // => '<li>fred</li><li>barney</li>'
       *
       * // Use the `sourceURL` option to specify a custom sourceURL for the template.
       * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
       * compiled(data);
       * // => Find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector.
       *
       * // Use the `variable` option to ensure a with-statement isn't used in the compiled template.
       * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
       * compiled.source;
       * // => function(data) {
       * //   var __t, __p = '';
       * //   __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!';
       * //   return __p;
       * // }
       *
       * // Use custom template delimiters.
       * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
       * var compiled = _.template('hello {{ user }}!');
       * compiled({ 'user': 'mustache' });
       * // => 'hello mustache!'
       *
       * // Use the `source` property to inline compiled templates for meaningful
       * // line numbers in error messages and stack traces.
       * fs.writeFileSync(path.join(process.cwd(), 'jst.js'), '\
       *   var JST = {\
       *     "main": ' + _.template(mainText).source + '\
       *   };\
       * ');
       */
      function template(string, options, guard) {
        // Based on John Resig's `tmpl` implementation
        // (http://ejohn.org/blog/javascript-micro-templating/)
        // and Laura Doktorova's doT.js (https://github.com/olado/doT).
        var settings = lodash.templateSettings;
  
        if (guard && isIterateeCall(string, options, guard)) {
          options = undefined;
        }
        string = toString(string);
        options = assignInWith({}, options, settings, customDefaultsAssignIn);
  
        var imports = assignInWith({}, options.imports, settings.imports, customDefaultsAssignIn),
            importsKeys = keys(imports),
            importsValues = baseValues(imports, importsKeys);
  
        var isEscaping,
            isEvaluating,
            index = 0,
            interpolate = options.interpolate || reNoMatch,
            source = "__p += '";
  
        // Compile the regexp to match each delimiter.
        var reDelimiters = RegExp(
          (options.escape || reNoMatch).source + '|' +
          interpolate.source + '|' +
          (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
          (options.evaluate || reNoMatch).source + '|$'
        , 'g');
  
        // Use a sourceURL for easier debugging.
        var sourceURL = '//# sourceURL=' +
          ('sourceURL' in options
            ? options.sourceURL
            : ('lodash.templateSources[' + (++templateCounter) + ']')
          ) + '\n';
  
        string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
          interpolateValue || (interpolateValue = esTemplateValue);
  
          // Escape characters that can't be included in string literals.
          source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar);
  
          // Replace delimiters with snippets.
          if (escapeValue) {
            isEscaping = true;
            source += "' +\n__e(" + escapeValue + ") +\n'";
          }
          if (evaluateValue) {
            isEvaluating = true;
            source += "';\n" + evaluateValue + ";\n__p += '";
          }
          if (interpolateValue) {
            source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
          }
          index = offset + match.length;
  
          // The JS engine embedded in Adobe products needs `match` returned in
          // order to produce the correct `offset` value.
          return match;
        });
  
        source += "';\n";
  
        // If `variable` is not specified wrap a with-statement around the generated
        // code to add the data object to the top of the scope chain.
        var variable = options.variable;
        if (!variable) {
          source = 'with (obj) {\n' + source + '\n}\n';
        }
        // Cleanup code by stripping empty strings.
        source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
          .replace(reEmptyStringMiddle, '$1')
          .replace(reEmptyStringTrailing, '$1;');
  
        // Frame code as the function body.
        source = 'function(' + (variable || 'obj') + ') {\n' +
          (variable
            ? ''
            : 'obj || (obj = {});\n'
          ) +
          "var __t, __p = ''" +
          (isEscaping
             ? ', __e = _.escape'
             : ''
          ) +
          (isEvaluating
            ? ', __j = Array.prototype.join;\n' +
              "function print() { __p += __j.call(arguments, '') }\n"
            : ';\n'
          ) +
          source +
          'return __p\n}';
  
        var result = attempt(function() {
          return Function(importsKeys, sourceURL + 'return ' + source)
            .apply(undefined, importsValues);
        });
  
        // Provide the compiled function's source by its `toString` method or
        // the `source` property as a convenience for inlining compiled templates.
        result.source = source;
        if (isError(result)) {
          throw result;
        }
        return result;
      }
  
      /**
       * Converts `string`, as a whole, to lower case just like
       * [String#toLowerCase](https://mdn.io/toLowerCase).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the lower cased string.
       * @example
       *
       * _.toLower('--Foo-Bar--');
       * // => '--foo-bar--'
       *
       * _.toLower('fooBar');
       * // => 'foobar'
       *
       * _.toLower('__FOO_BAR__');
       * // => '__foo_bar__'
       */
      function toLower(value) {
        return toString(value).toLowerCase();
      }
  
      /**
       * Converts `string`, as a whole, to upper case just like
       * [String#toUpperCase](https://mdn.io/toUpperCase).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the upper cased string.
       * @example
       *
       * _.toUpper('--foo-bar--');
       * // => '--FOO-BAR--'
       *
       * _.toUpper('fooBar');
       * // => 'FOOBAR'
       *
       * _.toUpper('__foo_bar__');
       * // => '__FOO_BAR__'
       */
      function toUpper(value) {
        return toString(value).toUpperCase();
      }
  
      /**
       * Removes leading and trailing whitespace or specified characters from `string`.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to trim.
       * @param {string} [chars=whitespace] The characters to trim.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {string} Returns the trimmed string.
       * @example
       *
       * _.trim('  abc  ');
       * // => 'abc'
       *
       * _.trim('-_-abc-_-', '_-');
       * // => 'abc'
       *
       * _.map(['  foo  ', '  bar  '], _.trim);
       * // => ['foo', 'bar']
       */
      function trim(string, chars, guard) {
        string = toString(string);
        if (string && (guard || chars === undefined)) {
          return string.replace(reTrim, '');
        }
        if (!string || !(chars = baseToString(chars))) {
          return string;
        }
        var strSymbols = stringToArray(string),
            chrSymbols = stringToArray(chars),
            start = charsStartIndex(strSymbols, chrSymbols),
            end = charsEndIndex(strSymbols, chrSymbols) + 1;
  
        return castSlice(strSymbols, start, end).join('');
      }
  
      /**
       * Removes trailing whitespace or specified characters from `string`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to trim.
       * @param {string} [chars=whitespace] The characters to trim.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {string} Returns the trimmed string.
       * @example
       *
       * _.trimEnd('  abc  ');
       * // => '  abc'
       *
       * _.trimEnd('-_-abc-_-', '_-');
       * // => '-_-abc'
       */
      function trimEnd(string, chars, guard) {
        string = toString(string);
        if (string && (guard || chars === undefined)) {
          return string.replace(reTrimEnd, '');
        }
        if (!string || !(chars = baseToString(chars))) {
          return string;
        }
        var strSymbols = stringToArray(string),
            end = charsEndIndex(strSymbols, stringToArray(chars)) + 1;
  
        return castSlice(strSymbols, 0, end).join('');
      }
  
      /**
       * Removes leading whitespace or specified characters from `string`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to trim.
       * @param {string} [chars=whitespace] The characters to trim.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {string} Returns the trimmed string.
       * @example
       *
       * _.trimStart('  abc  ');
       * // => 'abc  '
       *
       * _.trimStart('-_-abc-_-', '_-');
       * // => 'abc-_-'
       */
      function trimStart(string, chars, guard) {
        string = toString(string);
        if (string && (guard || chars === undefined)) {
          return string.replace(reTrimStart, '');
        }
        if (!string || !(chars = baseToString(chars))) {
          return string;
        }
        var strSymbols = stringToArray(string),
            start = charsStartIndex(strSymbols, stringToArray(chars));
  
        return castSlice(strSymbols, start).join('');
      }
  
      /**
       * Truncates `string` if it's longer than the given maximum string length.
       * The last characters of the truncated string are replaced with the omission
       * string which defaults to "...".
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to truncate.
       * @param {Object} [options={}] The options object.
       * @param {number} [options.length=30] The maximum string length.
       * @param {string} [options.omission='...'] The string to indicate text is omitted.
       * @param {RegExp|string} [options.separator] The separator pattern to truncate to.
       * @returns {string} Returns the truncated string.
       * @example
       *
       * _.truncate('hi-diddly-ho there, neighborino');
       * // => 'hi-diddly-ho there, neighbo...'
       *
       * _.truncate('hi-diddly-ho there, neighborino', {
       *   'length': 24,
       *   'separator': ' '
       * });
       * // => 'hi-diddly-ho there,...'
       *
       * _.truncate('hi-diddly-ho there, neighborino', {
       *   'length': 24,
       *   'separator': /,? +/
       * });
       * // => 'hi-diddly-ho there...'
       *
       * _.truncate('hi-diddly-ho there, neighborino', {
       *   'omission': ' [...]'
       * });
       * // => 'hi-diddly-ho there, neig [...]'
       */
      function truncate(string, options) {
        var length = DEFAULT_TRUNC_LENGTH,
            omission = DEFAULT_TRUNC_OMISSION;
  
        if (isObject(options)) {
          var separator = 'separator' in options ? options.separator : separator;
          length = 'length' in options ? toInteger(options.length) : length;
          omission = 'omission' in options ? baseToString(options.omission) : omission;
        }
        string = toString(string);
  
        var strLength = string.length;
        if (hasUnicode(string)) {
          var strSymbols = stringToArray(string);
          strLength = strSymbols.length;
        }
        if (length >= strLength) {
          return string;
        }
        var end = length - stringSize(omission);
        if (end < 1) {
          return omission;
        }
        var result = strSymbols
          ? castSlice(strSymbols, 0, end).join('')
          : string.slice(0, end);
  
        if (separator === undefined) {
          return result + omission;
        }
        if (strSymbols) {
          end += (result.length - end);
        }
        if (isRegExp(separator)) {
          if (string.slice(end).search(separator)) {
            var match,
                substring = result;
  
            if (!separator.global) {
              separator = RegExp(separator.source, toString(reFlags.exec(separator)) + 'g');
            }
            separator.lastIndex = 0;
            while ((match = separator.exec(substring))) {
              var newEnd = match.index;
            }
            result = result.slice(0, newEnd === undefined ? end : newEnd);
          }
        } else if (string.indexOf(baseToString(separator), end) != end) {
          var index = result.lastIndexOf(separator);
          if (index > -1) {
            result = result.slice(0, index);
          }
        }
        return result + omission;
      }
  
      /**
       * The inverse of `_.escape`; this method converts the HTML entities
       * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to
       * their corresponding characters.
       *
       * **Note:** No other HTML entities are unescaped. To unescape additional
       * HTML entities use a third-party library like [_he_](https://mths.be/he).
       *
       * @static
       * @memberOf _
       * @since 0.6.0
       * @category String
       * @param {string} [string=''] The string to unescape.
       * @returns {string} Returns the unescaped string.
       * @example
       *
       * _.unescape('fred, barney, &amp; pebbles');
       * // => 'fred, barney, & pebbles'
       */
      function unescape(string) {
        string = toString(string);
        return (string && reHasEscapedHtml.test(string))
          ? string.replace(reEscapedHtml, unescapeHtmlChar)
          : string;
      }
  
      /**
       * Converts `string`, as space separated words, to upper case.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the upper cased string.
       * @example
       *
       * _.upperCase('--foo-bar');
       * // => 'FOO BAR'
       *
       * _.upperCase('fooBar');
       * // => 'FOO BAR'
       *
       * _.upperCase('__foo_bar__');
       * // => 'FOO BAR'
       */
      var upperCase = createCompounder(function(result, word, index) {
        return result + (index ? ' ' : '') + word.toUpperCase();
      });
  
      /**
       * Converts the first character of `string` to upper case.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the converted string.
       * @example
       *
       * _.upperFirst('fred');
       * // => 'Fred'
       *
       * _.upperFirst('FRED');
       * // => 'FRED'
       */
      var upperFirst = createCaseFirst('toUpperCase');
  
      /**
       * Splits `string` into an array of its words.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to inspect.
       * @param {RegExp|string} [pattern] The pattern to match words.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the words of `string`.
       * @example
       *
       * _.words('fred, barney, & pebbles');
       * // => ['fred', 'barney', 'pebbles']
       *
       * _.words('fred, barney, & pebbles', /[^, ]+/g);
       * // => ['fred', 'barney', '&', 'pebbles']
       */
      function words(string, pattern, guard) {
        string = toString(string);
        pattern = guard ? undefined : pattern;
  
        if (pattern === undefined) {
          return hasUnicodeWord(string) ? unicodeWords(string) : asciiWords(string);
        }
        return string.match(pattern) || [];
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Attempts to invoke `func`, returning either the result or the caught error
       * object. Any additional arguments are provided to `func` when it's invoked.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Util
       * @param {Function} func The function to attempt.
       * @param {...*} [args] The arguments to invoke `func` with.
       * @returns {*} Returns the `func` result or error object.
       * @example
       *
       * // Avoid throwing errors for invalid selectors.
       * var elements = _.attempt(function(selector) {
       *   return document.querySelectorAll(selector);
       * }, '>_>');
       *
       * if (_.isError(elements)) {
       *   elements = [];
       * }
       */
      var attempt = baseRest(function(func, args) {
        try {
          return apply(func, undefined, args);
        } catch (e) {
          return isError(e) ? e : new Error(e);
        }
      });
  
      /**
       * Binds methods of an object to the object itself, overwriting the existing
       * method.
       *
       * **Note:** This method doesn't set the "length" property of bound functions.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @param {Object} object The object to bind and assign the bound methods to.
       * @param {...(string|string[])} methodNames The object method names to bind.
       * @returns {Object} Returns `object`.
       * @example
       *
       * var view = {
       *   'label': 'docs',
       *   'click': function() {
       *     console.log('clicked ' + this.label);
       *   }
       * };
       *
       * _.bindAll(view, ['click']);
       * jQuery(element).on('click', view.click);
       * // => Logs 'clicked docs' when clicked.
       */
      var bindAll = flatRest(function(object, methodNames) {
        arrayEach(methodNames, function(key) {
          key = toKey(key);
          baseAssignValue(object, key, bind(object[key], object));
        });
        return object;
      });
  
      /**
       * Creates a function that iterates over `pairs` and invokes the corresponding
       * function of the first predicate to return truthy. The predicate-function
       * pairs are invoked with the `this` binding and arguments of the created
       * function.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {Array} pairs The predicate-function pairs.
       * @returns {Function} Returns the new composite function.
       * @example
       *
       * var func = _.cond([
       *   [_.matches({ 'a': 1 }),           _.constant('matches A')],
       *   [_.conforms({ 'b': _.isNumber }), _.constant('matches B')],
       *   [_.stubTrue,                      _.constant('no match')]
       * ]);
       *
       * func({ 'a': 1, 'b': 2 });
       * // => 'matches A'
       *
       * func({ 'a': 0, 'b': 1 });
       * // => 'matches B'
       *
       * func({ 'a': '1', 'b': '2' });
       * // => 'no match'
       */
      function cond(pairs) {
        var length = pairs == null ? 0 : pairs.length,
            toIteratee = getIteratee();
  
        pairs = !length ? [] : arrayMap(pairs, function(pair) {
          if (typeof pair[1] != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          return [toIteratee(pair[0]), pair[1]];
        });
  
        return baseRest(function(args) {
          var index = -1;
          while (++index < length) {
            var pair = pairs[index];
            if (apply(pair[0], this, args)) {
              return apply(pair[1], this, args);
            }
          }
        });
      }
  
      /**
       * Creates a function that invokes the predicate properties of `source` with
       * the corresponding property values of a given object, returning `true` if
       * all predicates return truthy, else `false`.
       *
       * **Note:** The created function is equivalent to `_.conformsTo` with
       * `source` partially applied.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {Object} source The object of property predicates to conform to.
       * @returns {Function} Returns the new spec function.
       * @example
       *
       * var objects = [
       *   { 'a': 2, 'b': 1 },
       *   { 'a': 1, 'b': 2 }
       * ];
       *
       * _.filter(objects, _.conforms({ 'b': function(n) { return n > 1; } }));
       * // => [{ 'a': 1, 'b': 2 }]
       */
      function conforms(source) {
        return baseConforms(baseClone(source, CLONE_DEEP_FLAG));
      }
  
      /**
       * Creates a function that returns `value`.
       *
       * @static
       * @memberOf _
       * @since 2.4.0
       * @category Util
       * @param {*} value The value to return from the new function.
       * @returns {Function} Returns the new constant function.
       * @example
       *
       * var objects = _.times(2, _.constant({ 'a': 1 }));
       *
       * console.log(objects);
       * // => [{ 'a': 1 }, { 'a': 1 }]
       *
       * console.log(objects[0] === objects[1]);
       * // => true
       */
      function constant(value) {
        return function() {
          return value;
        };
      }
  
      /**
       * Checks `value` to determine whether a default value should be returned in
       * its place. The `defaultValue` is returned if `value` is `NaN`, `null`,
       * or `undefined`.
       *
       * @static
       * @memberOf _
       * @since 4.14.0
       * @category Util
       * @param {*} value The value to check.
       * @param {*} defaultValue The default value.
       * @returns {*} Returns the resolved value.
       * @example
       *
       * _.defaultTo(1, 10);
       * // => 1
       *
       * _.defaultTo(undefined, 10);
       * // => 10
       */
      function defaultTo(value, defaultValue) {
        return (value == null || value !== value) ? defaultValue : value;
      }
  
      /**
       * Creates a function that returns the result of invoking the given functions
       * with the `this` binding of the created function, where each successive
       * invocation is supplied the return value of the previous.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Util
       * @param {...(Function|Function[])} [funcs] The functions to invoke.
       * @returns {Function} Returns the new composite function.
       * @see _.flowRight
       * @example
       *
       * function square(n) {
       *   return n * n;
       * }
       *
       * var addSquare = _.flow([_.add, square]);
       * addSquare(1, 2);
       * // => 9
       */
      var flow = createFlow();
  
      /**
       * This method is like `_.flow` except that it creates a function that
       * invokes the given functions from right to left.
       *
       * @static
       * @since 3.0.0
       * @memberOf _
       * @category Util
       * @param {...(Function|Function[])} [funcs] The functions to invoke.
       * @returns {Function} Returns the new composite function.
       * @see _.flow
       * @example
       *
       * function square(n) {
       *   return n * n;
       * }
       *
       * var addSquare = _.flowRight([square, _.add]);
       * addSquare(1, 2);
       * // => 9
       */
      var flowRight = createFlow(true);
  
      /**
       * This method returns the first argument it receives.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @param {*} value Any value.
       * @returns {*} Returns `value`.
       * @example
       *
       * var object = { 'a': 1 };
       *
       * console.log(_.identity(object) === object);
       * // => true
       */
      function identity(value) {
        return value;
      }
  
      /**
       * Creates a function that invokes `func` with the arguments of the created
       * function. If `func` is a property name, the created function returns the
       * property value for a given element. If `func` is an array or object, the
       * created function returns `true` for elements that contain the equivalent
       * source properties, otherwise it returns `false`.
       *
       * @static
       * @since 4.0.0
       * @memberOf _
       * @category Util
       * @param {*} [func=_.identity] The value to convert to a callback.
       * @returns {Function} Returns the callback.
       * @example
       *
       * var users = [
       *   { 'user': 'barney', 'age': 36, 'active': true },
       *   { 'user': 'fred',   'age': 40, 'active': false }
       * ];
       *
       * // The `_.matches` iteratee shorthand.
       * _.filter(users, _.iteratee({ 'user': 'barney', 'active': true }));
       * // => [{ 'user': 'barney', 'age': 36, 'active': true }]
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.filter(users, _.iteratee(['user', 'fred']));
       * // => [{ 'user': 'fred', 'age': 40 }]
       *
       * // The `_.property` iteratee shorthand.
       * _.map(users, _.iteratee('user'));
       * // => ['barney', 'fred']
       *
       * // Create custom iteratee shorthands.
       * _.iteratee = _.wrap(_.iteratee, function(iteratee, func) {
       *   return !_.isRegExp(func) ? iteratee(func) : function(string) {
       *     return func.test(string);
       *   };
       * });
       *
       * _.filter(['abc', 'def'], /ef/);
       * // => ['def']
       */
      function iteratee(func) {
        return baseIteratee(typeof func == 'function' ? func : baseClone(func, CLONE_DEEP_FLAG));
      }
  
      /**
       * Creates a function that performs a partial deep comparison between a given
       * object and `source`, returning `true` if the given object has equivalent
       * property values, else `false`.
       *
       * **Note:** The created function is equivalent to `_.isMatch` with `source`
       * partially applied.
       *
       * Partial comparisons will match empty array and empty object `source`
       * values against any array or object value, respectively. See `_.isEqual`
       * for a list of supported value comparisons.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Util
       * @param {Object} source The object of property values to match.
       * @returns {Function} Returns the new spec function.
       * @example
       *
       * var objects = [
       *   { 'a': 1, 'b': 2, 'c': 3 },
       *   { 'a': 4, 'b': 5, 'c': 6 }
       * ];
       *
       * _.filter(objects, _.matches({ 'a': 4, 'c': 6 }));
       * // => [{ 'a': 4, 'b': 5, 'c': 6 }]
       */
      function matches(source) {
        return baseMatches(baseClone(source, CLONE_DEEP_FLAG));
      }
  
      /**
       * Creates a function that performs a partial deep comparison between the
       * value at `path` of a given object to `srcValue`, returning `true` if the
       * object value is equivalent, else `false`.
       *
       * **Note:** Partial comparisons will match empty array and empty object
       * `srcValue` values against any array or object value, respectively. See
       * `_.isEqual` for a list of supported value comparisons.
       *
       * @static
       * @memberOf _
       * @since 3.2.0
       * @category Util
       * @param {Array|string} path The path of the property to get.
       * @param {*} srcValue The value to match.
       * @returns {Function} Returns the new spec function.
       * @example
       *
       * var objects = [
       *   { 'a': 1, 'b': 2, 'c': 3 },
       *   { 'a': 4, 'b': 5, 'c': 6 }
       * ];
       *
       * _.find(objects, _.matchesProperty('a', 4));
       * // => { 'a': 4, 'b': 5, 'c': 6 }
       */
      function matchesProperty(path, srcValue) {
        return baseMatchesProperty(path, baseClone(srcValue, CLONE_DEEP_FLAG));
      }
  
      /**
       * Creates a function that invokes the method at `path` of a given object.
       * Any additional arguments are provided to the invoked method.
       *
       * @static
       * @memberOf _
       * @since 3.7.0
       * @category Util
       * @param {Array|string} path The path of the method to invoke.
       * @param {...*} [args] The arguments to invoke the method with.
       * @returns {Function} Returns the new invoker function.
       * @example
       *
       * var objects = [
       *   { 'a': { 'b': _.constant(2) } },
       *   { 'a': { 'b': _.constant(1) } }
       * ];
       *
       * _.map(objects, _.method('a.b'));
       * // => [2, 1]
       *
       * _.map(objects, _.method(['a', 'b']));
       * // => [2, 1]
       */
      var method = baseRest(function(path, args) {
        return function(object) {
          return baseInvoke(object, path, args);
        };
      });
  
      /**
       * The opposite of `_.method`; this method creates a function that invokes
       * the method at a given path of `object`. Any additional arguments are
       * provided to the invoked method.
       *
       * @static
       * @memberOf _
       * @since 3.7.0
       * @category Util
       * @param {Object} object The object to query.
       * @param {...*} [args] The arguments to invoke the method with.
       * @returns {Function} Returns the new invoker function.
       * @example
       *
       * var array = _.times(3, _.constant),
       *     object = { 'a': array, 'b': array, 'c': array };
       *
       * _.map(['a[2]', 'c[0]'], _.methodOf(object));
       * // => [2, 0]
       *
       * _.map([['a', '2'], ['c', '0']], _.methodOf(object));
       * // => [2, 0]
       */
      var methodOf = baseRest(function(object, args) {
        return function(path) {
          return baseInvoke(object, path, args);
        };
      });
  
      /**
       * Adds all own enumerable string keyed function properties of a source
       * object to the destination object. If `object` is a function, then methods
       * are added to its prototype as well.
       *
       * **Note:** Use `_.runInContext` to create a pristine `lodash` function to
       * avoid conflicts caused by modifying the original.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @param {Function|Object} [object=lodash] The destination object.
       * @param {Object} source The object of functions to add.
       * @param {Object} [options={}] The options object.
       * @param {boolean} [options.chain=true] Specify whether mixins are chainable.
       * @returns {Function|Object} Returns `object`.
       * @example
       *
       * function vowels(string) {
       *   return _.filter(string, function(v) {
       *     return /[aeiou]/i.test(v);
       *   });
       * }
       *
       * _.mixin({ 'vowels': vowels });
       * _.vowels('fred');
       * // => ['e']
       *
       * _('fred').vowels().value();
       * // => ['e']
       *
       * _.mixin({ 'vowels': vowels }, { 'chain': false });
       * _('fred').vowels();
       * // => ['e']
       */
      function mixin(object, source, options) {
        var props = keys(source),
            methodNames = baseFunctions(source, props);
  
        if (options == null &&
            !(isObject(source) && (methodNames.length || !props.length))) {
          options = source;
          source = object;
          object = this;
          methodNames = baseFunctions(source, keys(source));
        }
        var chain = !(isObject(options) && 'chain' in options) || !!options.chain,
            isFunc = isFunction(object);
  
        arrayEach(methodNames, function(methodName) {
          var func = source[methodName];
          object[methodName] = func;
          if (isFunc) {
            object.prototype[methodName] = function() {
              var chainAll = this.__chain__;
              if (chain || chainAll) {
                var result = object(this.__wrapped__),
                    actions = result.__actions__ = copyArray(this.__actions__);
  
                actions.push({ 'func': func, 'args': arguments, 'thisArg': object });
                result.__chain__ = chainAll;
                return result;
              }
              return func.apply(object, arrayPush([this.value()], arguments));
            };
          }
        });
  
        return object;
      }
  
      /**
       * Reverts the `_` variable to its previous value and returns a reference to
       * the `lodash` function.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @returns {Function} Returns the `lodash` function.
       * @example
       *
       * var lodash = _.noConflict();
       */
      function noConflict() {
        if (root._ === this) {
          root._ = oldDash;
        }
        return this;
      }
  
      /**
       * This method returns `undefined`.
       *
       * @static
       * @memberOf _
       * @since 2.3.0
       * @category Util
       * @example
       *
       * _.times(2, _.noop);
       * // => [undefined, undefined]
       */
      function noop() {
        // No operation performed.
      }
  
      /**
       * Creates a function that gets the argument at index `n`. If `n` is negative,
       * the nth argument from the end is returned.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {number} [n=0] The index of the argument to return.
       * @returns {Function} Returns the new pass-thru function.
       * @example
       *
       * var func = _.nthArg(1);
       * func('a', 'b', 'c', 'd');
       * // => 'b'
       *
       * var func = _.nthArg(-2);
       * func('a', 'b', 'c', 'd');
       * // => 'c'
       */
      function nthArg(n) {
        n = toInteger(n);
        return baseRest(function(args) {
          return baseNth(args, n);
        });
      }
  
      /**
       * Creates a function that invokes `iteratees` with the arguments it receives
       * and returns their results.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {...(Function|Function[])} [iteratees=[_.identity]]
       *  The iteratees to invoke.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var func = _.over([Math.max, Math.min]);
       *
       * func(1, 2, 3, 4);
       * // => [4, 1]
       */
      var over = createOver(arrayMap);
  
      /**
       * Creates a function that checks if **all** of the `predicates` return
       * truthy when invoked with the arguments it receives.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {...(Function|Function[])} [predicates=[_.identity]]
       *  The predicates to check.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var func = _.overEvery([Boolean, isFinite]);
       *
       * func('1');
       * // => true
       *
       * func(null);
       * // => false
       *
       * func(NaN);
       * // => false
       */
      var overEvery = createOver(arrayEvery);
  
      /**
       * Creates a function that checks if **any** of the `predicates` return
       * truthy when invoked with the arguments it receives.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {...(Function|Function[])} [predicates=[_.identity]]
       *  The predicates to check.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var func = _.overSome([Boolean, isFinite]);
       *
       * func('1');
       * // => true
       *
       * func(null);
       * // => true
       *
       * func(NaN);
       * // => false
       */
      var overSome = createOver(arraySome);
  
      /**
       * Creates a function that returns the value at `path` of a given object.
       *
       * @static
       * @memberOf _
       * @since 2.4.0
       * @category Util
       * @param {Array|string} path The path of the property to get.
       * @returns {Function} Returns the new accessor function.
       * @example
       *
       * var objects = [
       *   { 'a': { 'b': 2 } },
       *   { 'a': { 'b': 1 } }
       * ];
       *
       * _.map(objects, _.property('a.b'));
       * // => [2, 1]
       *
       * _.map(_.sortBy(objects, _.property(['a', 'b'])), 'a.b');
       * // => [1, 2]
       */
      function property(path) {
        return isKey(path) ? baseProperty(toKey(path)) : basePropertyDeep(path);
      }
  
      /**
       * The opposite of `_.property`; this method creates a function that returns
       * the value at a given path of `object`.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Util
       * @param {Object} object The object to query.
       * @returns {Function} Returns the new accessor function.
       * @example
       *
       * var array = [0, 1, 2],
       *     object = { 'a': array, 'b': array, 'c': array };
       *
       * _.map(['a[2]', 'c[0]'], _.propertyOf(object));
       * // => [2, 0]
       *
       * _.map([['a', '2'], ['c', '0']], _.propertyOf(object));
       * // => [2, 0]
       */
      function propertyOf(object) {
        return function(path) {
          return object == null ? undefined : baseGet(object, path);
        };
      }
  
      /**
       * Creates an array of numbers (positive and/or negative) progressing from
       * `start` up to, but not including, `end`. A step of `-1` is used if a negative
       * `start` is specified without an `end` or `step`. If `end` is not specified,
       * it's set to `start` with `start` then set to `0`.
       *
       * **Note:** JavaScript follows the IEEE-754 standard for resolving
       * floating-point values which can produce unexpected results.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @param {number} [start=0] The start of the range.
       * @param {number} end The end of the range.
       * @param {number} [step=1] The value to increment or decrement by.
       * @returns {Array} Returns the range of numbers.
       * @see _.inRange, _.rangeRight
       * @example
       *
       * _.range(4);
       * // => [0, 1, 2, 3]
       *
       * _.range(-4);
       * // => [0, -1, -2, -3]
       *
       * _.range(1, 5);
       * // => [1, 2, 3, 4]
       *
       * _.range(0, 20, 5);
       * // => [0, 5, 10, 15]
       *
       * _.range(0, -4, -1);
       * // => [0, -1, -2, -3]
       *
       * _.range(1, 4, 0);
       * // => [1, 1, 1]
       *
       * _.range(0);
       * // => []
       */
      var range = createRange();
  
      /**
       * This method is like `_.range` except that it populates values in
       * descending order.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {number} [start=0] The start of the range.
       * @param {number} end The end of the range.
       * @param {number} [step=1] The value to increment or decrement by.
       * @returns {Array} Returns the range of numbers.
       * @see _.inRange, _.range
       * @example
       *
       * _.rangeRight(4);
       * // => [3, 2, 1, 0]
       *
       * _.rangeRight(-4);
       * // => [-3, -2, -1, 0]
       *
       * _.rangeRight(1, 5);
       * // => [4, 3, 2, 1]
       *
       * _.rangeRight(0, 20, 5);
       * // => [15, 10, 5, 0]
       *
       * _.rangeRight(0, -4, -1);
       * // => [-3, -2, -1, 0]
       *
       * _.rangeRight(1, 4, 0);
       * // => [1, 1, 1]
       *
       * _.rangeRight(0);
       * // => []
       */
      var rangeRight = createRange(true);
  
      /**
       * This method returns a new empty array.
       *
       * @static
       * @memberOf _
       * @since 4.13.0
       * @category Util
       * @returns {Array} Returns the new empty array.
       * @example
       *
       * var arrays = _.times(2, _.stubArray);
       *
       * console.log(arrays);
       * // => [[], []]
       *
       * console.log(arrays[0] === arrays[1]);
       * // => false
       */
      function stubArray() {
        return [];
      }
  
      /**
       * This method returns `false`.
       *
       * @static
       * @memberOf _
       * @since 4.13.0
       * @category Util
       * @returns {boolean} Returns `false`.
       * @example
       *
       * _.times(2, _.stubFalse);
       * // => [false, false]
       */
      function stubFalse() {
        return false;
      }
  
      /**
       * This method returns a new empty object.
       *
       * @static
       * @memberOf _
       * @since 4.13.0
       * @category Util
       * @returns {Object} Returns the new empty object.
       * @example
       *
       * var objects = _.times(2, _.stubObject);
       *
       * console.log(objects);
       * // => [{}, {}]
       *
       * console.log(objects[0] === objects[1]);
       * // => false
       */
      function stubObject() {
        return {};
      }
  
      /**
       * This method returns an empty string.
       *
       * @static
       * @memberOf _
       * @since 4.13.0
       * @category Util
       * @returns {string} Returns the empty string.
       * @example
       *
       * _.times(2, _.stubString);
       * // => ['', '']
       */
      function stubString() {
        return '';
      }
  
      /**
       * This method returns `true`.
       *
       * @static
       * @memberOf _
       * @since 4.13.0
       * @category Util
       * @returns {boolean} Returns `true`.
       * @example
       *
       * _.times(2, _.stubTrue);
       * // => [true, true]
       */
      function stubTrue() {
        return true;
      }
  
      /**
       * Invokes the iteratee `n` times, returning an array of the results of
       * each invocation. The iteratee is invoked with one argument; (index).
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @param {number} n The number of times to invoke `iteratee`.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the array of results.
       * @example
       *
       * _.times(3, String);
       * // => ['0', '1', '2']
       *
       *  _.times(4, _.constant(0));
       * // => [0, 0, 0, 0]
       */
      function times(n, iteratee) {
        n = toInteger(n);
        if (n < 1 || n > MAX_SAFE_INTEGER) {
          return [];
        }
        var index = MAX_ARRAY_LENGTH,
            length = nativeMin(n, MAX_ARRAY_LENGTH);
  
        iteratee = getIteratee(iteratee);
        n -= MAX_ARRAY_LENGTH;
  
        var result = baseTimes(length, iteratee);
        while (++index < n) {
          iteratee(index);
        }
        return result;
      }
  
      /**
       * Converts `value` to a property path array.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {*} value The value to convert.
       * @returns {Array} Returns the new property path array.
       * @example
       *
       * _.toPath('a.b.c');
       * // => ['a', 'b', 'c']
       *
       * _.toPath('a[0].b.c');
       * // => ['a', '0', 'b', 'c']
       */
      function toPath(value) {
        if (isArray(value)) {
          return arrayMap(value, toKey);
        }
        return isSymbol(value) ? [value] : copyArray(stringToPath(toString(value)));
      }
  
      /**
       * Generates a unique ID. If `prefix` is given, the ID is appended to it.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @param {string} [prefix=''] The value to prefix the ID with.
       * @returns {string} Returns the unique ID.
       * @example
       *
       * _.uniqueId('contact_');
       * // => 'contact_104'
       *
       * _.uniqueId();
       * // => '105'
       */
      function uniqueId(prefix) {
        var id = ++idCounter;
        return toString(prefix) + id;
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Adds two numbers.
       *
       * @static
       * @memberOf _
       * @since 3.4.0
       * @category Math
       * @param {number} augend The first number in an addition.
       * @param {number} addend The second number in an addition.
       * @returns {number} Returns the total.
       * @example
       *
       * _.add(6, 4);
       * // => 10
       */
      var add = createMathOperation(function(augend, addend) {
        return augend + addend;
      }, 0);
  
      /**
       * Computes `number` rounded up to `precision`.
       *
       * @static
       * @memberOf _
       * @since 3.10.0
       * @category Math
       * @param {number} number The number to round up.
       * @param {number} [precision=0] The precision to round up to.
       * @returns {number} Returns the rounded up number.
       * @example
       *
       * _.ceil(4.006);
       * // => 5
       *
       * _.ceil(6.004, 2);
       * // => 6.01
       *
       * _.ceil(6040, -2);
       * // => 6100
       */
      var ceil = createRound('ceil');
  
      /**
       * Divide two numbers.
       *
       * @static
       * @memberOf _
       * @since 4.7.0
       * @category Math
       * @param {number} dividend The first number in a division.
       * @param {number} divisor The second number in a division.
       * @returns {number} Returns the quotient.
       * @example
       *
       * _.divide(6, 4);
       * // => 1.5
       */
      var divide = createMathOperation(function(dividend, divisor) {
        return dividend / divisor;
      }, 1);
  
      /**
       * Computes `number` rounded down to `precision`.
       *
       * @static
       * @memberOf _
       * @since 3.10.0
       * @category Math
       * @param {number} number The number to round down.
       * @param {number} [precision=0] The precision to round down to.
       * @returns {number} Returns the rounded down number.
       * @example
       *
       * _.floor(4.006);
       * // => 4
       *
       * _.floor(0.046, 2);
       * // => 0.04
       *
       * _.floor(4060, -2);
       * // => 4000
       */
      var floor = createRound('floor');
  
      /**
       * Computes the maximum value of `array`. If `array` is empty or falsey,
       * `undefined` is returned.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Math
       * @param {Array} array The array to iterate over.
       * @returns {*} Returns the maximum value.
       * @example
       *
       * _.max([4, 2, 8, 6]);
       * // => 8
       *
       * _.max([]);
       * // => undefined
       */
      function max(array) {
        return (array && array.length)
          ? baseExtremum(array, identity, baseGt)
          : undefined;
      }
  
      /**
       * This method is like `_.max` except that it accepts `iteratee` which is
       * invoked for each element in `array` to generate the criterion by which
       * the value is ranked. The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Math
       * @param {Array} array The array to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {*} Returns the maximum value.
       * @example
       *
       * var objects = [{ 'n': 1 }, { 'n': 2 }];
       *
       * _.maxBy(objects, function(o) { return o.n; });
       * // => { 'n': 2 }
       *
       * // The `_.property` iteratee shorthand.
       * _.maxBy(objects, 'n');
       * // => { 'n': 2 }
       */
      function maxBy(array, iteratee) {
        return (array && array.length)
          ? baseExtremum(array, getIteratee(iteratee, 2), baseGt)
          : undefined;
      }
  
      /**
       * Computes the mean of the values in `array`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Math
       * @param {Array} array The array to iterate over.
       * @returns {number} Returns the mean.
       * @example
       *
       * _.mean([4, 2, 8, 6]);
       * // => 5
       */
      function mean(array) {
        return baseMean(array, identity);
      }
  
      /**
       * This method is like `_.mean` except that it accepts `iteratee` which is
       * invoked for each element in `array` to generate the value to be averaged.
       * The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.7.0
       * @category Math
       * @param {Array} array The array to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {number} Returns the mean.
       * @example
       *
       * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
       *
       * _.meanBy(objects, function(o) { return o.n; });
       * // => 5
       *
       * // The `_.property` iteratee shorthand.
       * _.meanBy(objects, 'n');
       * // => 5
       */
      function meanBy(array, iteratee) {
        return baseMean(array, getIteratee(iteratee, 2));
      }
  
      /**
       * Computes the minimum value of `array`. If `array` is empty or falsey,
       * `undefined` is returned.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Math
       * @param {Array} array The array to iterate over.
       * @returns {*} Returns the minimum value.
       * @example
       *
       * _.min([4, 2, 8, 6]);
       * // => 2
       *
       * _.min([]);
       * // => undefined
       */
      function min(array) {
        return (array && array.length)
          ? baseExtremum(array, identity, baseLt)
          : undefined;
      }
  
      /**
       * This method is like `_.min` except that it accepts `iteratee` which is
       * invoked for each element in `array` to generate the criterion by which
       * the value is ranked. The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Math
       * @param {Array} array The array to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {*} Returns the minimum value.
       * @example
       *
       * var objects = [{ 'n': 1 }, { 'n': 2 }];
       *
       * _.minBy(objects, function(o) { return o.n; });
       * // => { 'n': 1 }
       *
       * // The `_.property` iteratee shorthand.
       * _.minBy(objects, 'n');
       * // => { 'n': 1 }
       */
      function minBy(array, iteratee) {
        return (array && array.length)
          ? baseExtremum(array, getIteratee(iteratee, 2), baseLt)
          : undefined;
      }
  
      /**
       * Multiply two numbers.
       *
       * @static
       * @memberOf _
       * @since 4.7.0
       * @category Math
       * @param {number} multiplier The first number in a multiplication.
       * @param {number} multiplicand The second number in a multiplication.
       * @returns {number} Returns the product.
       * @example
       *
       * _.multiply(6, 4);
       * // => 24
       */
      var multiply = createMathOperation(function(multiplier, multiplicand) {
        return multiplier * multiplicand;
      }, 1);
  
      /**
       * Computes `number` rounded to `precision`.
       *
       * @static
       * @memberOf _
       * @since 3.10.0
       * @category Math
       * @param {number} number The number to round.
       * @param {number} [precision=0] The precision to round to.
       * @returns {number} Returns the rounded number.
       * @example
       *
       * _.round(4.006);
       * // => 4
       *
       * _.round(4.006, 2);
       * // => 4.01
       *
       * _.round(4060, -2);
       * // => 4100
       */
      var round = createRound('round');
  
      /**
       * Subtract two numbers.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Math
       * @param {number} minuend The first number in a subtraction.
       * @param {number} subtrahend The second number in a subtraction.
       * @returns {number} Returns the difference.
       * @example
       *
       * _.subtract(6, 4);
       * // => 2
       */
      var subtract = createMathOperation(function(minuend, subtrahend) {
        return minuend - subtrahend;
      }, 0);
  
      /**
       * Computes the sum of the values in `array`.
       *
       * @static
       * @memberOf _
       * @since 3.4.0
       * @category Math
       * @param {Array} array The array to iterate over.
       * @returns {number} Returns the sum.
       * @example
       *
       * _.sum([4, 2, 8, 6]);
       * // => 20
       */
      function sum(array) {
        return (array && array.length)
          ? baseSum(array, identity)
          : 0;
      }
  
      /**
       * This method is like `_.sum` except that it accepts `iteratee` which is
       * invoked for each element in `array` to generate the value to be summed.
       * The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Math
       * @param {Array} array The array to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {number} Returns the sum.
       * @example
       *
       * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
       *
       * _.sumBy(objects, function(o) { return o.n; });
       * // => 20
       *
       * // The `_.property` iteratee shorthand.
       * _.sumBy(objects, 'n');
       * // => 20
       */
      function sumBy(array, iteratee) {
        return (array && array.length)
          ? baseSum(array, getIteratee(iteratee, 2))
          : 0;
      }
  
      /*------------------------------------------------------------------------*/
  
      // Add methods that return wrapped values in chain sequences.
      lodash.after = after;
      lodash.ary = ary;
      lodash.assign = assign;
      lodash.assignIn = assignIn;
      lodash.assignInWith = assignInWith;
      lodash.assignWith = assignWith;
      lodash.at = at;
      lodash.before = before;
      lodash.bind = bind;
      lodash.bindAll = bindAll;
      lodash.bindKey = bindKey;
      lodash.castArray = castArray;
      lodash.chain = chain;
      lodash.chunk = chunk;
      lodash.compact = compact;
      lodash.concat = concat;
      lodash.cond = cond;
      lodash.conforms = conforms;
      lodash.constant = constant;
      lodash.countBy = countBy;
      lodash.create = create;
      lodash.curry = curry;
      lodash.curryRight = curryRight;
      lodash.debounce = debounce;
      lodash.defaults = defaults;
      lodash.defaultsDeep = defaultsDeep;
      lodash.defer = defer;
      lodash.delay = delay;
      lodash.difference = difference;
      lodash.differenceBy = differenceBy;
      lodash.differenceWith = differenceWith;
      lodash.drop = drop;
      lodash.dropRight = dropRight;
      lodash.dropRightWhile = dropRightWhile;
      lodash.dropWhile = dropWhile;
      lodash.fill = fill;
      lodash.filter = filter;
      lodash.flatMap = flatMap;
      lodash.flatMapDeep = flatMapDeep;
      lodash.flatMapDepth = flatMapDepth;
      lodash.flatten = flatten;
      lodash.flattenDeep = flattenDeep;
      lodash.flattenDepth = flattenDepth;
      lodash.flip = flip;
      lodash.flow = flow;
      lodash.flowRight = flowRight;
      lodash.fromPairs = fromPairs;
      lodash.functions = functions;
      lodash.functionsIn = functionsIn;
      lodash.groupBy = groupBy;
      lodash.initial = initial;
      lodash.intersection = intersection;
      lodash.intersectionBy = intersectionBy;
      lodash.intersectionWith = intersectionWith;
      lodash.invert = invert;
      lodash.invertBy = invertBy;
      lodash.invokeMap = invokeMap;
      lodash.iteratee = iteratee;
      lodash.keyBy = keyBy;
      lodash.keys = keys;
      lodash.keysIn = keysIn;
      lodash.map = map;
      lodash.mapKeys = mapKeys;
      lodash.mapValues = mapValues;
      lodash.matches = matches;
      lodash.matchesProperty = matchesProperty;
      lodash.memoize = memoize;
      lodash.merge = merge;
      lodash.mergeWith = mergeWith;
      lodash.method = method;
      lodash.methodOf = methodOf;
      lodash.mixin = mixin;
      lodash.negate = negate;
      lodash.nthArg = nthArg;
      lodash.omit = omit;
      lodash.omitBy = omitBy;
      lodash.once = once;
      lodash.orderBy = orderBy;
      lodash.over = over;
      lodash.overArgs = overArgs;
      lodash.overEvery = overEvery;
      lodash.overSome = overSome;
      lodash.partial = partial;
      lodash.partialRight = partialRight;
      lodash.partition = partition;
      lodash.pick = pick;
      lodash.pickBy = pickBy;
      lodash.property = property;
      lodash.propertyOf = propertyOf;
      lodash.pull = pull;
      lodash.pullAll = pullAll;
      lodash.pullAllBy = pullAllBy;
      lodash.pullAllWith = pullAllWith;
      lodash.pullAt = pullAt;
      lodash.range = range;
      lodash.rangeRight = rangeRight;
      lodash.rearg = rearg;
      lodash.reject = reject;
      lodash.remove = remove;
      lodash.rest = rest;
      lodash.reverse = reverse;
      lodash.sampleSize = sampleSize;
      lodash.set = set;
      lodash.setWith = setWith;
      lodash.shuffle = shuffle;
      lodash.slice = slice;
      lodash.sortBy = sortBy;
      lodash.sortedUniq = sortedUniq;
      lodash.sortedUniqBy = sortedUniqBy;
      lodash.split = split;
      lodash.spread = spread;
      lodash.tail = tail;
      lodash.take = take;
      lodash.takeRight = takeRight;
      lodash.takeRightWhile = takeRightWhile;
      lodash.takeWhile = takeWhile;
      lodash.tap = tap;
      lodash.throttle = throttle;
      lodash.thru = thru;
      lodash.toArray = toArray;
      lodash.toPairs = toPairs;
      lodash.toPairsIn = toPairsIn;
      lodash.toPath = toPath;
      lodash.toPlainObject = toPlainObject;
      lodash.transform = transform;
      lodash.unary = unary;
      lodash.union = union;
      lodash.unionBy = unionBy;
      lodash.unionWith = unionWith;
      lodash.uniq = uniq;
      lodash.uniqBy = uniqBy;
      lodash.uniqWith = uniqWith;
      lodash.unset = unset;
      lodash.unzip = unzip;
      lodash.unzipWith = unzipWith;
      lodash.update = update;
      lodash.updateWith = updateWith;
      lodash.values = values;
      lodash.valuesIn = valuesIn;
      lodash.without = without;
      lodash.words = words;
      lodash.wrap = wrap;
      lodash.xor = xor;
      lodash.xorBy = xorBy;
      lodash.xorWith = xorWith;
      lodash.zip = zip;
      lodash.zipObject = zipObject;
      lodash.zipObjectDeep = zipObjectDeep;
      lodash.zipWith = zipWith;
  
      // Add aliases.
      lodash.entries = toPairs;
      lodash.entriesIn = toPairsIn;
      lodash.extend = assignIn;
      lodash.extendWith = assignInWith;
  
      // Add methods to `lodash.prototype`.
      mixin(lodash, lodash);
  
      /*------------------------------------------------------------------------*/
  
      // Add methods that return unwrapped values in chain sequences.
      lodash.add = add;
      lodash.attempt = attempt;
      lodash.camelCase = camelCase;
      lodash.capitalize = capitalize;
      lodash.ceil = ceil;
      lodash.clamp = clamp;
      lodash.clone = clone;
      lodash.cloneDeep = cloneDeep;
      lodash.cloneDeepWith = cloneDeepWith;
      lodash.cloneWith = cloneWith;
      lodash.conformsTo = conformsTo;
      lodash.deburr = deburr;
      lodash.defaultTo = defaultTo;
      lodash.divide = divide;
      lodash.endsWith = endsWith;
      lodash.eq = eq;
      lodash.escape = escape;
      lodash.escapeRegExp = escapeRegExp;
      lodash.every = every;
      lodash.find = find;
      lodash.findIndex = findIndex;
      lodash.findKey = findKey;
      lodash.findLast = findLast;
      lodash.findLastIndex = findLastIndex;
      lodash.findLastKey = findLastKey;
      lodash.floor = floor;
      lodash.forEach = forEach;
      lodash.forEachRight = forEachRight;
      lodash.forIn = forIn;
      lodash.forInRight = forInRight;
      lodash.forOwn = forOwn;
      lodash.forOwnRight = forOwnRight;
      lodash.get = get;
      lodash.gt = gt;
      lodash.gte = gte;
      lodash.has = has;
      lodash.hasIn = hasIn;
      lodash.head = head;
      lodash.identity = identity;
      lodash.includes = includes;
      lodash.indexOf = indexOf;
      lodash.inRange = inRange;
      lodash.invoke = invoke;
      lodash.isArguments = isArguments;
      lodash.isArray = isArray;
      lodash.isArrayBuffer = isArrayBuffer;
      lodash.isArrayLike = isArrayLike;
      lodash.isArrayLikeObject = isArrayLikeObject;
      lodash.isBoolean = isBoolean;
      lodash.isBuffer = isBuffer;
      lodash.isDate = isDate;
      lodash.isElement = isElement;
      lodash.isEmpty = isEmpty;
      lodash.isEqual = isEqual;
      lodash.isEqualWith = isEqualWith;
      lodash.isError = isError;
      lodash.isFinite = isFinite;
      lodash.isFunction = isFunction;
      lodash.isInteger = isInteger;
      lodash.isLength = isLength;
      lodash.isMap = isMap;
      lodash.isMatch = isMatch;
      lodash.isMatchWith = isMatchWith;
      lodash.isNaN = isNaN;
      lodash.isNative = isNative;
      lodash.isNil = isNil;
      lodash.isNull = isNull;
      lodash.isNumber = isNumber;
      lodash.isObject = isObject;
      lodash.isObjectLike = isObjectLike;
      lodash.isPlainObject = isPlainObject;
      lodash.isRegExp = isRegExp;
      lodash.isSafeInteger = isSafeInteger;
      lodash.isSet = isSet;
      lodash.isString = isString;
      lodash.isSymbol = isSymbol;
      lodash.isTypedArray = isTypedArray;
      lodash.isUndefined = isUndefined;
      lodash.isWeakMap = isWeakMap;
      lodash.isWeakSet = isWeakSet;
      lodash.join = join;
      lodash.kebabCase = kebabCase;
      lodash.last = last;
      lodash.lastIndexOf = lastIndexOf;
      lodash.lowerCase = lowerCase;
      lodash.lowerFirst = lowerFirst;
      lodash.lt = lt;
      lodash.lte = lte;
      lodash.max = max;
      lodash.maxBy = maxBy;
      lodash.mean = mean;
      lodash.meanBy = meanBy;
      lodash.min = min;
      lodash.minBy = minBy;
      lodash.stubArray = stubArray;
      lodash.stubFalse = stubFalse;
      lodash.stubObject = stubObject;
      lodash.stubString = stubString;
      lodash.stubTrue = stubTrue;
      lodash.multiply = multiply;
      lodash.nth = nth;
      lodash.noConflict = noConflict;
      lodash.noop = noop;
      lodash.now = now;
      lodash.pad = pad;
      lodash.padEnd = padEnd;
      lodash.padStart = padStart;
      lodash.parseInt = parseInt;
      lodash.random = random;
      lodash.reduce = reduce;
      lodash.reduceRight = reduceRight;
      lodash.repeat = repeat;
      lodash.replace = replace;
      lodash.result = result;
      lodash.round = round;
      lodash.runInContext = runInContext;
      lodash.sample = sample;
      lodash.size = size;
      lodash.snakeCase = snakeCase;
      lodash.some = some;
      lodash.sortedIndex = sortedIndex;
      lodash.sortedIndexBy = sortedIndexBy;
      lodash.sortedIndexOf = sortedIndexOf;
      lodash.sortedLastIndex = sortedLastIndex;
      lodash.sortedLastIndexBy = sortedLastIndexBy;
      lodash.sortedLastIndexOf = sortedLastIndexOf;
      lodash.startCase = startCase;
      lodash.startsWith = startsWith;
      lodash.subtract = subtract;
      lodash.sum = sum;
      lodash.sumBy = sumBy;
      lodash.template = template;
      lodash.times = times;
      lodash.toFinite = toFinite;
      lodash.toInteger = toInteger;
      lodash.toLength = toLength;
      lodash.toLower = toLower;
      lodash.toNumber = toNumber;
      lodash.toSafeInteger = toSafeInteger;
      lodash.toString = toString;
      lodash.toUpper = toUpper;
      lodash.trim = trim;
      lodash.trimEnd = trimEnd;
      lodash.trimStart = trimStart;
      lodash.truncate = truncate;
      lodash.unescape = unescape;
      lodash.uniqueId = uniqueId;
      lodash.upperCase = upperCase;
      lodash.upperFirst = upperFirst;
  
      // Add aliases.
      lodash.each = forEach;
      lodash.eachRight = forEachRight;
      lodash.first = head;
  
      mixin(lodash, (function() {
        var source = {};
        baseForOwn(lodash, function(func, methodName) {
          if (!hasOwnProperty.call(lodash.prototype, methodName)) {
            source[methodName] = func;
          }
        });
        return source;
      }()), { 'chain': false });
  
      /*------------------------------------------------------------------------*/
  
      /**
       * The semantic version number.
       *
       * @static
       * @memberOf _
       * @type {string}
       */
      lodash.VERSION = VERSION;
  
      // Assign default placeholders.
      arrayEach(['bind', 'bindKey', 'curry', 'curryRight', 'partial', 'partialRight'], function(methodName) {
        lodash[methodName].placeholder = lodash;
      });
  
      // Add `LazyWrapper` methods for `_.drop` and `_.take` variants.
      arrayEach(['drop', 'take'], function(methodName, index) {
        LazyWrapper.prototype[methodName] = function(n) {
          n = n === undefined ? 1 : nativeMax(toInteger(n), 0);
  
          var result = (this.__filtered__ && !index)
            ? new LazyWrapper(this)
            : this.clone();
  
          if (result.__filtered__) {
            result.__takeCount__ = nativeMin(n, result.__takeCount__);
          } else {
            result.__views__.push({
              'size': nativeMin(n, MAX_ARRAY_LENGTH),
              'type': methodName + (result.__dir__ < 0 ? 'Right' : '')
            });
          }
          return result;
        };
  
        LazyWrapper.prototype[methodName + 'Right'] = function(n) {
          return this.reverse()[methodName](n).reverse();
        };
      });
  
      // Add `LazyWrapper` methods that accept an `iteratee` value.
      arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) {
        var type = index + 1,
            isFilter = type == LAZY_FILTER_FLAG || type == LAZY_WHILE_FLAG;
  
        LazyWrapper.prototype[methodName] = function(iteratee) {
          var result = this.clone();
          result.__iteratees__.push({
            'iteratee': getIteratee(iteratee, 3),
            'type': type
          });
          result.__filtered__ = result.__filtered__ || isFilter;
          return result;
        };
      });
  
      // Add `LazyWrapper` methods for `_.head` and `_.last`.
      arrayEach(['head', 'last'], function(methodName, index) {
        var takeName = 'take' + (index ? 'Right' : '');
  
        LazyWrapper.prototype[methodName] = function() {
          return this[takeName](1).value()[0];
        };
      });
  
      // Add `LazyWrapper` methods for `_.initial` and `_.tail`.
      arrayEach(['initial', 'tail'], function(methodName, index) {
        var dropName = 'drop' + (index ? '' : 'Right');
  
        LazyWrapper.prototype[methodName] = function() {
          return this.__filtered__ ? new LazyWrapper(this) : this[dropName](1);
        };
      });
  
      LazyWrapper.prototype.compact = function() {
        return this.filter(identity);
      };
  
      LazyWrapper.prototype.find = function(predicate) {
        return this.filter(predicate).head();
      };
  
      LazyWrapper.prototype.findLast = function(predicate) {
        return this.reverse().find(predicate);
      };
  
      LazyWrapper.prototype.invokeMap = baseRest(function(path, args) {
        if (typeof path == 'function') {
          return new LazyWrapper(this);
        }
        return this.map(function(value) {
          return baseInvoke(value, path, args);
        });
      });
  
      LazyWrapper.prototype.reject = function(predicate) {
        return this.filter(negate(getIteratee(predicate)));
      };
  
      LazyWrapper.prototype.slice = function(start, end) {
        start = toInteger(start);
  
        var result = this;
        if (result.__filtered__ && (start > 0 || end < 0)) {
          return new LazyWrapper(result);
        }
        if (start < 0) {
          result = result.takeRight(-start);
        } else if (start) {
          result = result.drop(start);
        }
        if (end !== undefined) {
          end = toInteger(end);
          result = end < 0 ? result.dropRight(-end) : result.take(end - start);
        }
        return result;
      };
  
      LazyWrapper.prototype.takeRightWhile = function(predicate) {
        return this.reverse().takeWhile(predicate).reverse();
      };
  
      LazyWrapper.prototype.toArray = function() {
        return this.take(MAX_ARRAY_LENGTH);
      };
  
      // Add `LazyWrapper` methods to `lodash.prototype`.
      baseForOwn(LazyWrapper.prototype, function(func, methodName) {
        var checkIteratee = /^(?:filter|find|map|reject)|While$/.test(methodName),
            isTaker = /^(?:head|last)$/.test(methodName),
            lodashFunc = lodash[isTaker ? ('take' + (methodName == 'last' ? 'Right' : '')) : methodName],
            retUnwrapped = isTaker || /^find/.test(methodName);
  
        if (!lodashFunc) {
          return;
        }
        lodash.prototype[methodName] = function() {
          var value = this.__wrapped__,
              args = isTaker ? [1] : arguments,
              isLazy = value instanceof LazyWrapper,
              iteratee = args[0],
              useLazy = isLazy || isArray(value);
  
          var interceptor = function(value) {
            var result = lodashFunc.apply(lodash, arrayPush([value], args));
            return (isTaker && chainAll) ? result[0] : result;
          };
  
          if (useLazy && checkIteratee && typeof iteratee == 'function' && iteratee.length != 1) {
            // Avoid lazy use if the iteratee has a "length" value other than `1`.
            isLazy = useLazy = false;
          }
          var chainAll = this.__chain__,
              isHybrid = !!this.__actions__.length,
              isUnwrapped = retUnwrapped && !chainAll,
              onlyLazy = isLazy && !isHybrid;
  
          if (!retUnwrapped && useLazy) {
            value = onlyLazy ? value : new LazyWrapper(this);
            var result = func.apply(value, args);
            result.__actions__.push({ 'func': thru, 'args': [interceptor], 'thisArg': undefined });
            return new LodashWrapper(result, chainAll);
          }
          if (isUnwrapped && onlyLazy) {
            return func.apply(this, args);
          }
          result = this.thru(interceptor);
          return isUnwrapped ? (isTaker ? result.value()[0] : result.value()) : result;
        };
      });
  
      // Add `Array` methods to `lodash.prototype`.
      arrayEach(['pop', 'push', 'shift', 'sort', 'splice', 'unshift'], function(methodName) {
        var func = arrayProto[methodName],
            chainName = /^(?:push|sort|unshift)$/.test(methodName) ? 'tap' : 'thru',
            retUnwrapped = /^(?:pop|shift)$/.test(methodName);
  
        lodash.prototype[methodName] = function() {
          var args = arguments;
          if (retUnwrapped && !this.__chain__) {
            var value = this.value();
            return func.apply(isArray(value) ? value : [], args);
          }
          return this[chainName](function(value) {
            return func.apply(isArray(value) ? value : [], args);
          });
        };
      });
  
      // Map minified method names to their real names.
      baseForOwn(LazyWrapper.prototype, function(func, methodName) {
        var lodashFunc = lodash[methodName];
        if (lodashFunc) {
          var key = (lodashFunc.name + ''),
              names = realNames[key] || (realNames[key] = []);
  
          names.push({ 'name': methodName, 'func': lodashFunc });
        }
      });
  
      realNames[createHybrid(undefined, WRAP_BIND_KEY_FLAG).name] = [{
        'name': 'wrapper',
        'func': undefined
      }];
  
      // Add methods to `LazyWrapper`.
      LazyWrapper.prototype.clone = lazyClone;
      LazyWrapper.prototype.reverse = lazyReverse;
      LazyWrapper.prototype.value = lazyValue;
  
      // Add chain sequence methods to the `lodash` wrapper.
      lodash.prototype.at = wrapperAt;
      lodash.prototype.chain = wrapperChain;
      lodash.prototype.commit = wrapperCommit;
      lodash.prototype.next = wrapperNext;
      lodash.prototype.plant = wrapperPlant;
      lodash.prototype.reverse = wrapperReverse;
      lodash.prototype.toJSON = lodash.prototype.valueOf = lodash.prototype.value = wrapperValue;
  
      // Add lazy aliases.
      lodash.prototype.first = lodash.prototype.head;
  
      if (symIterator) {
        lodash.prototype[symIterator] = wrapperToIterator;
      }
      return lodash;
    });
  
    /*--------------------------------------------------------------------------*/
  
    // Export lodash.
    var _ = runInContext();
  
    // Some AMD build optimizers, like r.js, check for condition patterns like:
    if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
      // Expose Lodash on the global object to prevent errors when Lodash is
      // loaded by a script tag in the presence of an AMD loader.
      // See http://requirejs.org/docs/errors.html#mismatch for more details.
      // Use `_.noConflict` to remove Lodash from the global object.
      root._ = _;
  
      // Define as an anonymous module so, through path mapping, it can be
      // referenced as the "underscore" module.
      define(function() {
        return _;
      });
    }
    // Check for `exports` after `define` in case a build optimizer adds it.
    else if (freeModule) {
      // Export for Node.js.
      (freeModule.exports = _)._ = _;
      // Export for CommonJS support.
      freeExports._ = _;
    }
    else {
      // Export to the global object.
      root._ = _;
    }
  }.call(this));
  
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{}],29:[function(require,module,exports){
  /* global define */
  
  (function (root, pluralize) {
    /* istanbul ignore else */
    if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
      // Node.
      module.exports = pluralize();
    } else if (typeof define === 'function' && define.amd) {
      // AMD, registers as an anonymous module.
      define(function () {
        return pluralize();
      });
    } else {
      // Browser global.
      root.pluralize = pluralize();
    }
  })(this, function () {
    // Rule storage - pluralize and singularize need to be run sequentially,
    // while other rules can be optimized using an object for instant lookups.
    var pluralRules = [];
    var singularRules = [];
    var uncountables = {};
    var irregularPlurals = {};
    var irregularSingles = {};
  
    /**
     * Sanitize a pluralization rule to a usable regular expression.
     *
     * @param  {(RegExp|string)} rule
     * @return {RegExp}
     */
    function sanitizeRule (rule) {
      if (typeof rule === 'string') {
        return new RegExp('^' + rule + '$', 'i');
      }
  
      return rule;
    }
  
    /**
     * Pass in a word token to produce a function that can replicate the case on
     * another word.
     *
     * @param  {string}   word
     * @param  {string}   token
     * @return {Function}
     */
    function restoreCase (word, token) {
      // Tokens are an exact match.
      if (word === token) return token;
  
      // Upper cased words. E.g. "HELLO".
      if (word === word.toUpperCase()) return token.toUpperCase();
  
      // Title cased words. E.g. "Title".
      if (word[0] === word[0].toUpperCase()) {
        return token.charAt(0).toUpperCase() + token.substr(1).toLowerCase();
      }
  
      // Lower cased words. E.g. "test".
      return token.toLowerCase();
    }
  
    /**
     * Interpolate a regexp string.
     *
     * @param  {string} str
     * @param  {Array}  args
     * @return {string}
     */
    function interpolate (str, args) {
      return str.replace(/\$(\d{1,2})/g, function (match, index) {
        return args[index] || '';
      });
    }
  
    /**
     * Replace a word using a rule.
     *
     * @param  {string} word
     * @param  {Array}  rule
     * @return {string}
     */
    function replace (word, rule) {
      return word.replace(rule[0], function (match, index) {
        var result = interpolate(rule[1], arguments);
  
        if (match === '') {
          return restoreCase(word[index - 1], result);
        }
  
        return restoreCase(match, result);
      });
    }
  
    /**
     * Sanitize a word by passing in the word and sanitization rules.
     *
     * @param  {string}   token
     * @param  {string}   word
     * @param  {Array}    rules
     * @return {string}
     */
    function sanitizeWord (token, word, rules) {
      // Empty string or doesn't need fixing.
      if (!token.length || uncountables.hasOwnProperty(token)) {
        return word;
      }
  
      var len = rules.length;
  
      // Iterate over the sanitization rules and use the first one to match.
      while (len--) {
        var rule = rules[len];
  
        if (rule[0].test(word)) return replace(word, rule);
      }
  
      return word;
    }
  
    /**
     * Replace a word with the updated word.
     *
     * @param  {Object}   replaceMap
     * @param  {Object}   keepMap
     * @param  {Array}    rules
     * @return {Function}
     */
    function replaceWord (replaceMap, keepMap, rules) {
      return function (word) {
        // Get the correct token and case restoration functions.
        var token = word.toLowerCase();
  
        // Check against the keep object map.
        if (keepMap.hasOwnProperty(token)) {
          return restoreCase(word, token);
        }
  
        // Check against the replacement map for a direct word replacement.
        if (replaceMap.hasOwnProperty(token)) {
          return restoreCase(word, replaceMap[token]);
        }
  
        // Run all the rules against the word.
        return sanitizeWord(token, word, rules);
      };
    }
  
    /**
     * Check if a word is part of the map.
     */
    function checkWord (replaceMap, keepMap, rules, bool) {
      return function (word) {
        var token = word.toLowerCase();
  
        if (keepMap.hasOwnProperty(token)) return true;
        if (replaceMap.hasOwnProperty(token)) return false;
  
        return sanitizeWord(token, token, rules) === token;
      };
    }
  
    /**
     * Pluralize or singularize a word based on the passed in count.
     *
     * @param  {string}  word
     * @param  {number}  count
     * @param  {boolean} inclusive
     * @return {string}
     */
    function pluralize (word, count, inclusive) {
      var pluralized = count === 1
        ? pluralize.singular(word) : pluralize.plural(word);
  
      return (inclusive ? count + ' ' : '') + pluralized;
    }
  
    /**
     * Pluralize a word.
     *
     * @type {Function}
     */
    pluralize.plural = replaceWord(
      irregularSingles, irregularPlurals, pluralRules
    );
  
    /**
     * Check if a word is plural.
     *
     * @type {Function}
     */
    pluralize.isPlural = checkWord(
      irregularSingles, irregularPlurals, pluralRules
    );
  
    /**
     * Singularize a word.
     *
     * @type {Function}
     */
    pluralize.singular = replaceWord(
      irregularPlurals, irregularSingles, singularRules
    );
  
    /**
     * Check if a word is singular.
     *
     * @type {Function}
     */
    pluralize.isSingular = checkWord(
      irregularPlurals, irregularSingles, singularRules
    );
  
    /**
     * Add a pluralization rule to the collection.
     *
     * @param {(string|RegExp)} rule
     * @param {string}          replacement
     */
    pluralize.addPluralRule = function (rule, replacement) {
      pluralRules.push([sanitizeRule(rule), replacement]);
    };
  
    /**
     * Add a singularization rule to the collection.
     *
     * @param {(string|RegExp)} rule
     * @param {string}          replacement
     */
    pluralize.addSingularRule = function (rule, replacement) {
      singularRules.push([sanitizeRule(rule), replacement]);
    };
  
    /**
     * Add an uncountable word rule.
     *
     * @param {(string|RegExp)} word
     */
    pluralize.addUncountableRule = function (word) {
      if (typeof word === 'string') {
        uncountables[word.toLowerCase()] = true;
        return;
      }
  
      // Set singular and plural references for the word.
      pluralize.addPluralRule(word, '$0');
      pluralize.addSingularRule(word, '$0');
    };
  
    /**
     * Add an irregular word definition.
     *
     * @param {string} single
     * @param {string} plural
     */
    pluralize.addIrregularRule = function (single, plural) {
      plural = plural.toLowerCase();
      single = single.toLowerCase();
  
      irregularSingles[single] = plural;
      irregularPlurals[plural] = single;
    };
  
    /**
     * Irregular rules.
     */
    [
      // Pronouns.
      ['I', 'we'],
      ['me', 'us'],
      ['he', 'they'],
      ['she', 'they'],
      ['them', 'them'],
      ['myself', 'ourselves'],
      ['yourself', 'yourselves'],
      ['itself', 'themselves'],
      ['herself', 'themselves'],
      ['himself', 'themselves'],
      ['themself', 'themselves'],
      ['is', 'are'],
      ['was', 'were'],
      ['has', 'have'],
      ['this', 'these'],
      ['that', 'those'],
      // Words ending in with a consonant and `o`.
      ['echo', 'echoes'],
      ['dingo', 'dingoes'],
      ['volcano', 'volcanoes'],
      ['tornado', 'tornadoes'],
      ['torpedo', 'torpedoes'],
      // Ends with `us`.
      ['genus', 'genera'],
      ['viscus', 'viscera'],
      // Ends with `ma`.
      ['stigma', 'stigmata'],
      ['stoma', 'stomata'],
      ['dogma', 'dogmata'],
      ['lemma', 'lemmata'],
      ['schema', 'schemata'],
      ['anathema', 'anathemata'],
      // Other irregular rules.
      ['ox', 'oxen'],
      ['axe', 'axes'],
      ['die', 'dice'],
      ['yes', 'yeses'],
      ['foot', 'feet'],
      ['eave', 'eaves'],
      ['goose', 'geese'],
      ['tooth', 'teeth'],
      ['quiz', 'quizzes'],
      ['human', 'humans'],
      ['proof', 'proofs'],
      ['carve', 'carves'],
      ['valve', 'valves'],
      ['looey', 'looies'],
      ['thief', 'thieves'],
      ['groove', 'grooves'],
      ['pickaxe', 'pickaxes'],
      ['whiskey', 'whiskies']
    ].forEach(function (rule) {
      return pluralize.addIrregularRule(rule[0], rule[1]);
    });
  
    /**
     * Pluralization rules.
     */
    [
      [/s?$/i, 's'],
      [/[^\u0000-\u007F]$/i, '$0'],
      [/([^aeiou]ese)$/i, '$1'],
      [/(ax|test)is$/i, '$1es'],
      [/(alias|[^aou]us|tlas|gas|ris)$/i, '$1es'],
      [/(e[mn]u)s?$/i, '$1s'],
      [/([^l]ias|[aeiou]las|[emjzr]as|[iu]am)$/i, '$1'],
      [/(alumn|syllab|octop|vir|radi|nucle|fung|cact|stimul|termin|bacill|foc|uter|loc|strat)(?:us|i)$/i, '$1i'],
      [/(alumn|alg|vertebr)(?:a|ae)$/i, '$1ae'],
      [/(seraph|cherub)(?:im)?$/i, '$1im'],
      [/(her|at|gr)o$/i, '$1oes'],
      [/(agend|addend|millenni|dat|extrem|bacteri|desiderat|strat|candelabr|errat|ov|symposi|curricul|automat|quor)(?:a|um)$/i, '$1a'],
      [/(apheli|hyperbat|periheli|asyndet|noumen|phenomen|criteri|organ|prolegomen|hedr|automat)(?:a|on)$/i, '$1a'],
      [/sis$/i, 'ses'],
      [/(?:(kni|wi|li)fe|(ar|l|ea|eo|oa|hoo)f)$/i, '$1$2ves'],
      [/([^aeiouy]|qu)y$/i, '$1ies'],
      [/([^ch][ieo][ln])ey$/i, '$1ies'],
      [/(x|ch|ss|sh|zz)$/i, '$1es'],
      [/(matr|cod|mur|sil|vert|ind|append)(?:ix|ex)$/i, '$1ices'],
      [/(m|l)(?:ice|ouse)$/i, '$1ice'],
      [/(pe)(?:rson|ople)$/i, '$1ople'],
      [/(child)(?:ren)?$/i, '$1ren'],
      [/eaux$/i, '$0'],
      [/m[ae]n$/i, 'men'],
      ['thou', 'you']
    ].forEach(function (rule) {
      return pluralize.addPluralRule(rule[0], rule[1]);
    });
  
    /**
     * Singularization rules.
     */
    [
      [/s$/i, ''],
      [/(ss)$/i, '$1'],
      [/(wi|kni|(?:after|half|high|low|mid|non|night|[^\w]|^)li)ves$/i, '$1fe'],
      [/(ar|(?:wo|[ae])l|[eo][ao])ves$/i, '$1f'],
      [/ies$/i, 'y'],
      [/\b([pl]|zomb|(?:neck|cross)?t|coll|faer|food|gen|goon|group|lass|talk|goal|cut)ies$/i, '$1ie'],
      [/\b(mon|smil)ies$/i, '$1ey'],
      [/(m|l)ice$/i, '$1ouse'],
      [/(seraph|cherub)im$/i, '$1'],
      [/(x|ch|ss|sh|zz|tto|go|cho|alias|[^aou]us|tlas|gas|(?:her|at|gr)o|ris)(?:es)?$/i, '$1'],
      [/(analy|ba|diagno|parenthe|progno|synop|the|empha|cri)(?:sis|ses)$/i, '$1sis'],
      [/(movie|twelve|abuse|e[mn]u)s$/i, '$1'],
      [/(test)(?:is|es)$/i, '$1is'],
      [/(alumn|syllab|octop|vir|radi|nucle|fung|cact|stimul|termin|bacill|foc|uter|loc|strat)(?:us|i)$/i, '$1us'],
      [/(agend|addend|millenni|dat|extrem|bacteri|desiderat|strat|candelabr|errat|ov|symposi|curricul|quor)a$/i, '$1um'],
      [/(apheli|hyperbat|periheli|asyndet|noumen|phenomen|criteri|organ|prolegomen|hedr|automat)a$/i, '$1on'],
      [/(alumn|alg|vertebr)ae$/i, '$1a'],
      [/(cod|mur|sil|vert|ind)ices$/i, '$1ex'],
      [/(matr|append)ices$/i, '$1ix'],
      [/(pe)(rson|ople)$/i, '$1rson'],
      [/(child)ren$/i, '$1'],
      [/(eau)x?$/i, '$1'],
      [/men$/i, 'man']
    ].forEach(function (rule) {
      return pluralize.addSingularRule(rule[0], rule[1]);
    });
  
    /**
     * Uncountable rules.
     */
    [
      // Singular words with no plurals.
      'adulthood',
      'advice',
      'agenda',
      'aid',
      'alcohol',
      'ammo',
      'anime',
      'athletics',
      'audio',
      'bison',
      'blood',
      'bream',
      'buffalo',
      'butter',
      'carp',
      'cash',
      'chassis',
      'chess',
      'clothing',
      'cod',
      'commerce',
      'cooperation',
      'corps',
      'debris',
      'diabetes',
      'digestion',
      'elk',
      'energy',
      'equipment',
      'excretion',
      'expertise',
      'flounder',
      'fun',
      'gallows',
      'garbage',
      'graffiti',
      'headquarters',
      'health',
      'herpes',
      'highjinks',
      'homework',
      'housework',
      'information',
      'jeans',
      'justice',
      'kudos',
      'labour',
      'literature',
      'machinery',
      'mackerel',
      'mail',
      'media',
      'mews',
      'moose',
      'music',
      'manga',
      'news',
      'pike',
      'plankton',
      'pliers',
      'pollution',
      'premises',
      'rain',
      'research',
      'rice',
      'salmon',
      'scissors',
      'series',
      'sewage',
      'shambles',
      'shrimp',
      'species',
      'staff',
      'swine',
      'tennis',
      'traffic',
      'transporation',
      'trout',
      'tuna',
      'wealth',
      'welfare',
      'whiting',
      'wildebeest',
      'wildlife',
      'you',
      // Regexes.
      /[^aeiou]ese$/i, // "chinese", "japanese"
      /deer$/i, // "deer", "reindeer"
      /fish$/i, // "fish", "blowfish", "angelfish"
      /measles$/i,
      /o[iu]s$/i, // "carnivorous"
      /pox$/i, // "chickpox", "smallpox"
      /sheep$/i
    ].forEach(pluralize.addUncountableRule);
  
    return pluralize;
  });
  
  },{}],30:[function(require,module,exports){
  // shim for using process in browser
  var process = module.exports = {};
  
  // cached from whatever global is present so that test runners that stub it
  // don't break things.  But we need to wrap it in a try catch in case it is
  // wrapped in strict mode code which doesn't define any globals.  It's inside a
  // function because try/catches deoptimize in certain engines.
  
  var cachedSetTimeout;
  var cachedClearTimeout;
  
  function defaultSetTimout() {
      throw new Error('setTimeout has not been defined');
  }
  function defaultClearTimeout () {
      throw new Error('clearTimeout has not been defined');
  }
  (function () {
      try {
          if (typeof setTimeout === 'function') {
              cachedSetTimeout = setTimeout;
          } else {
              cachedSetTimeout = defaultSetTimout;
          }
      } catch (e) {
          cachedSetTimeout = defaultSetTimout;
      }
      try {
          if (typeof clearTimeout === 'function') {
              cachedClearTimeout = clearTimeout;
          } else {
              cachedClearTimeout = defaultClearTimeout;
          }
      } catch (e) {
          cachedClearTimeout = defaultClearTimeout;
      }
  } ())
  function runTimeout(fun) {
      if (cachedSetTimeout === setTimeout) {
          //normal enviroments in sane situations
          return setTimeout(fun, 0);
      }
      // if setTimeout wasn't available but was latter defined
      if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
          cachedSetTimeout = setTimeout;
          return setTimeout(fun, 0);
      }
      try {
          // when when somebody has screwed with setTimeout but no I.E. maddness
          return cachedSetTimeout(fun, 0);
      } catch(e){
          try {
              // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
              return cachedSetTimeout.call(null, fun, 0);
          } catch(e){
              // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
              return cachedSetTimeout.call(this, fun, 0);
          }
      }
  
  
  }
  function runClearTimeout(marker) {
      if (cachedClearTimeout === clearTimeout) {
          //normal enviroments in sane situations
          return clearTimeout(marker);
      }
      // if clearTimeout wasn't available but was latter defined
      if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
          cachedClearTimeout = clearTimeout;
          return clearTimeout(marker);
      }
      try {
          // when when somebody has screwed with setTimeout but no I.E. maddness
          return cachedClearTimeout(marker);
      } catch (e){
          try {
              // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
              return cachedClearTimeout.call(null, marker);
          } catch (e){
              // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
              // Some versions of I.E. have different rules for clearTimeout vs setTimeout
              return cachedClearTimeout.call(this, marker);
          }
      }
  
  
  
  }
  var queue = [];
  var draining = false;
  var currentQueue;
  var queueIndex = -1;
  
  function cleanUpNextTick() {
      if (!draining || !currentQueue) {
          return;
      }
      draining = false;
      if (currentQueue.length) {
          queue = currentQueue.concat(queue);
      } else {
          queueIndex = -1;
      }
      if (queue.length) {
          drainQueue();
      }
  }
  
  function drainQueue() {
      if (draining) {
          return;
      }
      var timeout = runTimeout(cleanUpNextTick);
      draining = true;
  
      var len = queue.length;
      while(len) {
          currentQueue = queue;
          queue = [];
          while (++queueIndex < len) {
              if (currentQueue) {
                  currentQueue[queueIndex].run();
              }
          }
          queueIndex = -1;
          len = queue.length;
      }
      currentQueue = null;
      draining = false;
      runClearTimeout(timeout);
  }
  
  process.nextTick = function (fun) {
      var args = new Array(arguments.length - 1);
      if (arguments.length > 1) {
          for (var i = 1; i < arguments.length; i++) {
              args[i - 1] = arguments[i];
          }
      }
      queue.push(new Item(fun, args));
      if (queue.length === 1 && !draining) {
          runTimeout(drainQueue);
      }
  };
  
  // v8 likes predictible objects
  function Item(fun, array) {
      this.fun = fun;
      this.array = array;
  }
  Item.prototype.run = function () {
      this.fun.apply(null, this.array);
  };
  process.title = 'browser';
  process.browser = true;
  process.env = {};
  process.argv = [];
  process.version = ''; // empty string to avoid regexp issues
  process.versions = {};
  
  function noop() {}
  
  process.on = noop;
  process.addListener = noop;
  process.once = noop;
  process.off = noop;
  process.removeListener = noop;
  process.removeAllListeners = noop;
  process.emit = noop;
  process.prependListener = noop;
  process.prependOnceListener = noop;
  
  process.listeners = function (name) { return [] }
  
  process.binding = function (name) {
      throw new Error('process.binding is not supported');
  };
  
  process.cwd = function () { return '/' };
  process.chdir = function (dir) {
      throw new Error('process.chdir is not supported');
  };
  process.umask = function() { return 0; };
  
  },{}],31:[function(require,module,exports){
  'use strict';
  var strictUriEncode = require('strict-uri-encode');
  var objectAssign = require('object-assign');
  var decodeComponent = require('decode-uri-component');
  
  function encoderForArrayFormat(opts) {
  	switch (opts.arrayFormat) {
  		case 'index':
  			return function (key, value, index) {
  				return value === null ? [
  					encode(key, opts),
  					'[',
  					index,
  					']'
  				].join('') : [
  					encode(key, opts),
  					'[',
  					encode(index, opts),
  					']=',
  					encode(value, opts)
  				].join('');
  			};
  
  		case 'bracket':
  			return function (key, value) {
  				return value === null ? encode(key, opts) : [
  					encode(key, opts),
  					'[]=',
  					encode(value, opts)
  				].join('');
  			};
  
  		default:
  			return function (key, value) {
  				return value === null ? encode(key, opts) : [
  					encode(key, opts),
  					'=',
  					encode(value, opts)
  				].join('');
  			};
  	}
  }
  
  function parserForArrayFormat(opts) {
  	var result;
  
  	switch (opts.arrayFormat) {
  		case 'index':
  			return function (key, value, accumulator) {
  				result = /\[(\d*)\]$/.exec(key);
  
  				key = key.replace(/\[\d*\]$/, '');
  
  				if (!result) {
  					accumulator[key] = value;
  					return;
  				}
  
  				if (accumulator[key] === undefined) {
  					accumulator[key] = {};
  				}
  
  				accumulator[key][result[1]] = value;
  			};
  
  		case 'bracket':
  			return function (key, value, accumulator) {
  				result = /(\[\])$/.exec(key);
  				key = key.replace(/\[\]$/, '');
  
  				if (!result) {
  					accumulator[key] = value;
  					return;
  				} else if (accumulator[key] === undefined) {
  					accumulator[key] = [value];
  					return;
  				}
  
  				accumulator[key] = [].concat(accumulator[key], value);
  			};
  
  		default:
  			return function (key, value, accumulator) {
  				if (accumulator[key] === undefined) {
  					accumulator[key] = value;
  					return;
  				}
  
  				accumulator[key] = [].concat(accumulator[key], value);
  			};
  	}
  }
  
  function encode(value, opts) {
  	if (opts.encode) {
  		return opts.strict ? strictUriEncode(value) : encodeURIComponent(value);
  	}
  
  	return value;
  }
  
  function keysSorter(input) {
  	if (Array.isArray(input)) {
  		return input.sort();
  	} else if (typeof input === 'object') {
  		return keysSorter(Object.keys(input)).sort(function (a, b) {
  			return Number(a) - Number(b);
  		}).map(function (key) {
  			return input[key];
  		});
  	}
  
  	return input;
  }
  
  exports.extract = function (str) {
  	var queryStart = str.indexOf('?');
  	if (queryStart === -1) {
  		return '';
  	}
  	return str.slice(queryStart + 1);
  };
  
  exports.parse = function (str, opts) {
  	opts = objectAssign({arrayFormat: 'none'}, opts);
  
  	var formatter = parserForArrayFormat(opts);
  
  	// Create an object with no prototype
  	// https://github.com/sindresorhus/query-string/issues/47
  	var ret = Object.create(null);
  
  	if (typeof str !== 'string') {
  		return ret;
  	}
  
  	str = str.trim().replace(/^[?#&]/, '');
  
  	if (!str) {
  		return ret;
  	}
  
  	str.split('&').forEach(function (param) {
  		var parts = param.replace(/\+/g, ' ').split('=');
  		// Firefox (pre 40) decodes `%3D` to `=`
  		// https://github.com/sindresorhus/query-string/pull/37
  		var key = parts.shift();
  		var val = parts.length > 0 ? parts.join('=') : undefined;
  
  		// missing `=` should be `null`:
  		// http://w3.org/TR/2012/WD-url-20120524/#collect-url-parameters
  		val = val === undefined ? null : decodeComponent(val);
  
  		formatter(decodeComponent(key), val, ret);
  	});
  
  	return Object.keys(ret).sort().reduce(function (result, key) {
  		var val = ret[key];
  		if (Boolean(val) && typeof val === 'object' && !Array.isArray(val)) {
  			// Sort object keys, not values
  			result[key] = keysSorter(val);
  		} else {
  			result[key] = val;
  		}
  
  		return result;
  	}, Object.create(null));
  };
  
  exports.stringify = function (obj, opts) {
  	var defaults = {
  		encode: true,
  		strict: true,
  		arrayFormat: 'none'
  	};
  
  	opts = objectAssign(defaults, opts);
  
  	var formatter = encoderForArrayFormat(opts);
  
  	return obj ? Object.keys(obj).sort().map(function (key) {
  		var val = obj[key];
  
  		if (val === undefined) {
  			return '';
  		}
  
  		if (val === null) {
  			return encode(key, opts);
  		}
  
  		if (Array.isArray(val)) {
  			var result = [];
  
  			val.slice().forEach(function (val2) {
  				if (val2 === undefined) {
  					return;
  				}
  
  				result.push(formatter(key, val2, result.length));
  			});
  
  			return result.join('&');
  		}
  
  		return encode(key, opts) + '=' + encode(val, opts);
  	}).filter(function (x) {
  		return x.length > 0;
  	}).join('&') : '';
  };
  
  },{"decode-uri-component":26,"object-assign":32,"strict-uri-encode":33}],32:[function(require,module,exports){
  /*
  object-assign
  (c) Sindre Sorhus
  @license MIT
  */
  
  'use strict';
  /* eslint-disable no-unused-vars */
  var getOwnPropertySymbols = Object.getOwnPropertySymbols;
  var hasOwnProperty = Object.prototype.hasOwnProperty;
  var propIsEnumerable = Object.prototype.propertyIsEnumerable;
  
  function toObject(val) {
  	if (val === null || val === undefined) {
  		throw new TypeError('Object.assign cannot be called with null or undefined');
  	}
  
  	return Object(val);
  }
  
  function shouldUseNative() {
  	try {
  		if (!Object.assign) {
  			return false;
  		}
  
  		// Detect buggy property enumeration order in older V8 versions.
  
  		// https://bugs.chromium.org/p/v8/issues/detail?id=4118
  		var test1 = new String('abc');  // eslint-disable-line no-new-wrappers
  		test1[5] = 'de';
  		if (Object.getOwnPropertyNames(test1)[0] === '5') {
  			return false;
  		}
  
  		// https://bugs.chromium.org/p/v8/issues/detail?id=3056
  		var test2 = {};
  		for (var i = 0; i < 10; i++) {
  			test2['_' + String.fromCharCode(i)] = i;
  		}
  		var order2 = Object.getOwnPropertyNames(test2).map(function (n) {
  			return test2[n];
  		});
  		if (order2.join('') !== '0123456789') {
  			return false;
  		}
  
  		// https://bugs.chromium.org/p/v8/issues/detail?id=3056
  		var test3 = {};
  		'abcdefghijklmnopqrst'.split('').forEach(function (letter) {
  			test3[letter] = letter;
  		});
  		if (Object.keys(Object.assign({}, test3)).join('') !==
  				'abcdefghijklmnopqrst') {
  			return false;
  		}
  
  		return true;
  	} catch (err) {
  		// We don't expect any of the above to throw, but better to be safe.
  		return false;
  	}
  }
  
  module.exports = shouldUseNative() ? Object.assign : function (target, source) {
  	var from;
  	var to = toObject(target);
  	var symbols;
  
  	for (var s = 1; s < arguments.length; s++) {
  		from = Object(arguments[s]);
  
  		for (var key in from) {
  			if (hasOwnProperty.call(from, key)) {
  				to[key] = from[key];
  			}
  		}
  
  		if (getOwnPropertySymbols) {
  			symbols = getOwnPropertySymbols(from);
  			for (var i = 0; i < symbols.length; i++) {
  				if (propIsEnumerable.call(from, symbols[i])) {
  					to[symbols[i]] = from[symbols[i]];
  				}
  			}
  		}
  	}
  
  	return to;
  };
  
  },{}],33:[function(require,module,exports){
  'use strict';
  module.exports = function (str) {
  	return encodeURIComponent(str).replace(/[!'()*]/g, function (c) {
  		return '%' + c.charCodeAt(0).toString(16).toUpperCase();
  	});
  };
  
  },{}],34:[function(require,module,exports){
  (function (global, factory) {
  	if (typeof define === 'function' && define.amd) {
  		define('uri-templates', [], factory);
  	} else if (typeof module !== 'undefined' && module.exports){
  		module.exports = factory();
  	} else {
  		global.UriTemplate = factory();
  	}
  })(this, function () {
  	var uriTemplateGlobalModifiers = {
  		"+": true,
  		"#": true,
  		".": true,
  		"/": true,
  		";": true,
  		"?": true,
  		"&": true
  	};
  	var uriTemplateSuffices = {
  		"*": true
  	};
  	var urlEscapedChars = /[:/&?#]/;
  
  	function notReallyPercentEncode(string) {
  		return encodeURI(string).replace(/%25[0-9][0-9]/g, function (doubleEncoded) {
  			return "%" + doubleEncoded.substring(3);
  		});
  	}
  
  	function isPercentEncoded(string) {
  		string = string.replace(/%../g, '');
  		return encodeURIComponent(string) === string;
  	}
  
  	function uriTemplateSubstitution(spec) {
  		var modifier = "";
  		if (uriTemplateGlobalModifiers[spec.charAt(0)]) {
  			modifier = spec.charAt(0);
  			spec = spec.substring(1);
  		}
  		var separator = "";
  		var prefix = "";
  		var shouldEscape = true;
  		var showVariables = false;
  		var trimEmptyString = false;
  		if (modifier == '+') {
  			shouldEscape = false;
  		} else if (modifier == ".") {
  			prefix = ".";
  			separator = ".";
  		} else if (modifier == "/") {
  			prefix = "/";
  			separator = "/";
  		} else if (modifier == '#') {
  			prefix = "#";
  			shouldEscape = false;
  		} else if (modifier == ';') {
  			prefix = ";";
  			separator = ";",
  			showVariables = true;
  			trimEmptyString = true;
  		} else if (modifier == '?') {
  			prefix = "?";
  			separator = "&",
  			showVariables = true;
  		} else if (modifier == '&') {
  			prefix = "&";
  			separator = "&",
  			showVariables = true;
  		}
  
  		var varNames = [];
  		var varList = spec.split(",");
  		var varSpecs = [];
  		var varSpecMap = {};
  		for (var i = 0; i < varList.length; i++) {
  			var varName = varList[i];
  			var truncate = null;
  			if (varName.indexOf(":") != -1) {
  				var parts = varName.split(":");
  				varName = parts[0];
  				truncate = parseInt(parts[1]);
  			}
  			var suffices = {};
  			while (uriTemplateSuffices[varName.charAt(varName.length - 1)]) {
  				suffices[varName.charAt(varName.length - 1)] = true;
  				varName = varName.substring(0, varName.length - 1);
  			}
  			var varSpec = {
  				truncate: truncate,
  				name: varName,
  				suffices: suffices
  			};
  			varSpecs.push(varSpec);
  			varSpecMap[varName] = varSpec;
  			varNames.push(varName);
  		}
  		var subFunction = function (valueFunction) {
  			var result = "";
  			var startIndex = 0;
  			for (var i = 0; i < varSpecs.length; i++) {
  				var varSpec = varSpecs[i];
  				var value = valueFunction(varSpec.name);
  				if (value == null || (Array.isArray(value) && value.length == 0) || (typeof value == 'object' && Object.keys(value).length == 0)) {
  					startIndex++;
  					continue;
  				}
  				if (i == startIndex) {
  					result += prefix;
  				} else {
  					result += (separator || ",");
  				}
  				if (Array.isArray(value)) {
  					if (showVariables) {
  						result += varSpec.name + "=";
  					}
  					for (var j = 0; j < value.length; j++) {
  						if (j > 0) {
  							result += varSpec.suffices['*'] ? (separator || ",") : ",";
  							if (varSpec.suffices['*'] && showVariables) {
  								result += varSpec.name + "=";
  							}
  						}
  						result += shouldEscape ? encodeURIComponent(value[j]).replace(/!/g, "%21") : notReallyPercentEncode(value[j]);
  					}
  				} else if (typeof value == "object") {
  					if (showVariables && !varSpec.suffices['*']) {
  						result += varSpec.name + "=";
  					}
  					var first = true;
  					for (var key in value) {
  						if (!first) {
  							result += varSpec.suffices['*'] ? (separator || ",") : ",";
  						}
  						first = false;
  						result += shouldEscape ? encodeURIComponent(key).replace(/!/g, "%21") : notReallyPercentEncode(key);
  						result += varSpec.suffices['*'] ? '=' : ",";
  						result += shouldEscape ? encodeURIComponent(value[key]).replace(/!/g, "%21") : notReallyPercentEncode(value[key]);
  					}
  				} else {
  					if (showVariables) {
  						result += varSpec.name;
  						if (!trimEmptyString || value != "") {
  							result += "=";
  						}
  					}
  					if (varSpec.truncate != null) {
  						value = value.substring(0, varSpec.truncate);
  					}
  					result += shouldEscape ? encodeURIComponent(value).replace(/!/g, "%21"): notReallyPercentEncode(value);
  				}
  			}
  			return result;
  		};
  		var guessFunction = function (stringValue, resultObj, strict) {
  			if (prefix) {
  				stringValue = stringValue.substring(prefix.length);
  			}
  			if (varSpecs.length == 1 && varSpecs[0].suffices['*']) {
  				var varSpec = varSpecs[0];
  				var varName = varSpec.name;
  				var arrayValue = varSpec.suffices['*'] ? stringValue.split(separator || ",") : [stringValue];
  				var hasEquals = (shouldEscape && stringValue.indexOf('=') != -1);	// There's otherwise no way to distinguish between "{value*}" for arrays and objects
  				for (var i = 1; i < arrayValue.length; i++) {
  					var stringValue = arrayValue[i];
  					if (hasEquals && stringValue.indexOf('=') == -1) {
  						// Bit of a hack - if we're expecting "=" for key/value pairs, and values can't contain "=", then assume a value has been accidentally split
  						arrayValue[i - 1] += (separator || ",") + stringValue;
  						arrayValue.splice(i, 1);
  						i--;
  					}
  				}
  				for (var i = 0; i < arrayValue.length; i++) {
  					var stringValue = arrayValue[i];
  					if (shouldEscape && stringValue.indexOf('=') != -1) {
  						hasEquals = true;
  					}
  					var innerArrayValue = stringValue.split(",");
  					if (innerArrayValue.length == 1) {
  						arrayValue[i] = innerArrayValue[0];
  					} else {
  						arrayValue[i] = innerArrayValue;
  					}
  				}
  
  				if (showVariables || hasEquals) {
  					var objectValue = resultObj[varName] || {};
  					for (var j = 0; j < arrayValue.length; j++) {
  						var innerValue = stringValue;
  						if (showVariables && !innerValue) {
  							// The empty string isn't a valid variable, so if our value is zero-length we have nothing
  							continue;
  						}
  						if (typeof arrayValue[j] == "string") {
  							var stringValue = arrayValue[j];
  							var innerVarName = stringValue.split("=", 1)[0];
  							var stringValue = stringValue.substring(innerVarName.length + 1);
  							if (shouldEscape) {
  								if (strict && !isPercentEncoded(stringValue)) {
  									return;
  								}
  								stringValue = decodeURIComponent(stringValue);
  							}
  							innerValue = stringValue;
  						} else {
  							var stringValue = arrayValue[j][0];
  							var innerVarName = stringValue.split("=", 1)[0];
  							var stringValue = stringValue.substring(innerVarName.length + 1);
  							if (shouldEscape) {
  								if (strict && !isPercentEncoded(stringValue)) {
  									return;
  								}
  								stringValue = decodeURIComponent(stringValue);
  							}
  							arrayValue[j][0] = stringValue;
  							innerValue = arrayValue[j];
  						}
  						if (shouldEscape) {
  							if (strict && !isPercentEncoded(innerVarName)) {
  								return;
  							}
  							innerVarName = decodeURIComponent(innerVarName);
  						}
  
  						if (objectValue[innerVarName] !== undefined) {
  							if (Array.isArray(objectValue[innerVarName])) {
  								objectValue[innerVarName].push(innerValue);
  							} else {
  								objectValue[innerVarName] = [objectValue[innerVarName], innerValue];
  							}
  						} else {
  							objectValue[innerVarName] = innerValue;
  						}
  					}
  					if (Object.keys(objectValue).length == 1 && objectValue[varName] !== undefined) {
  						resultObj[varName] = objectValue[varName];
  					} else {
  						resultObj[varName] = objectValue;
  					}
  				} else {
  					if (shouldEscape) {
  						for (var j = 0; j < arrayValue.length; j++) {
  							var innerArrayValue = arrayValue[j];
  							if (Array.isArray(innerArrayValue)) {
  								for (var k = 0; k < innerArrayValue.length; k++) {
  									if (strict && !isPercentEncoded(innerArrayValue[k])) {
  										return;
  									}
  									innerArrayValue[k] = decodeURIComponent(innerArrayValue[k]);
  								}
  							} else {
  								if (strict && !isPercentEncoded(innerArrayValue)) {
  									return;
  								}
  								arrayValue[j] = decodeURIComponent(innerArrayValue);
  							}
  						}
  					}
  
  					if (resultObj[varName] !== undefined) {
  						if (Array.isArray(resultObj[varName])) {
  							resultObj[varName] = resultObj[varName].concat(arrayValue);
  						} else {
  							resultObj[varName] = [resultObj[varName]].concat(arrayValue);
  						}
  					} else {
  						if (arrayValue.length == 1 && !varSpec.suffices['*']) {
  							resultObj[varName] = arrayValue[0];
  						} else {
  							resultObj[varName] = arrayValue;
  						}
  					}
  				}
  			} else {
  				var arrayValue = (varSpecs.length == 1) ? [stringValue] : stringValue.split(separator || ",");
  				var specIndexMap = {};
  				for (var i = 0; i < arrayValue.length; i++) {
  					// Try from beginning
  					var firstStarred = 0;
  					for (; firstStarred < varSpecs.length - 1 && firstStarred < i; firstStarred++) {
  						if (varSpecs[firstStarred].suffices['*']) {
  							break;
  						}
  					}
  					if (firstStarred == i) {
  						// The first [i] of them have no "*" suffix
  						specIndexMap[i] = i;
  						continue;
  					} else {
  						// Try from the end
  						for (var lastStarred = varSpecs.length - 1; lastStarred > 0 && (varSpecs.length - lastStarred) < (arrayValue.length - i); lastStarred--) {
  							if (varSpecs[lastStarred].suffices['*']) {
  								break;
  							}
  						}
  						if ((varSpecs.length - lastStarred) == (arrayValue.length - i)) {
  							// The last [length - i] of them have no "*" suffix
  							specIndexMap[i] = lastStarred;
  							continue;
  						}
  					}
  					// Just give up and use the first one
  					specIndexMap[i] = firstStarred;
  				}
  				for (var i = 0; i < arrayValue.length; i++) {
  					var stringValue = arrayValue[i];
  					if (!stringValue && showVariables) {
  						// The empty string isn't a valid variable, so if our value is zero-length we have nothing
  						continue;
  					}
  					var innerArrayValue = stringValue.split(",");
  					var hasEquals = false;
  
  					if (showVariables) {
  						var stringValue = innerArrayValue[0]; // using innerArrayValue
  						var varName = stringValue.split("=", 1)[0];
  						var stringValue = stringValue.substring(varName.length + 1);
  						innerArrayValue[0] = stringValue;
  						var varSpec = varSpecMap[varName] || varSpecs[0];
  					} else {
  						var varSpec = varSpecs[specIndexMap[i]];
  						var varName = varSpec.name;
  					}
  
  					for (var j = 0; j < innerArrayValue.length; j++) {
  						if (shouldEscape) {
  							if (strict && !isPercentEncoded(innerArrayValue[j])) {
  								return;
  							}
  							innerArrayValue[j] = decodeURIComponent(innerArrayValue[j]);
  						}
  					}
  
  					if ((showVariables || varSpec.suffices['*'])&& resultObj[varName] !== undefined) {
  						if (Array.isArray(resultObj[varName])) {
  							resultObj[varName] = resultObj[varName].concat(innerArrayValue);
  						} else {
  							resultObj[varName] = [resultObj[varName]].concat(innerArrayValue);
  						}
  					} else {
  						if (innerArrayValue.length == 1 && !varSpec.suffices['*']) {
  							resultObj[varName] = innerArrayValue[0];
  						} else {
  							resultObj[varName] = innerArrayValue;
  						}
  					}
  				}
  			}
  			return 1;
  		};
  		return {
  			varNames: varNames,
  			prefix: prefix,
  			substitution: subFunction,
  			unSubstitution: guessFunction
  		};
  	}
  
  	function UriTemplate(template) {
  		if (!(this instanceof UriTemplate)) {
  			return new UriTemplate(template);
  		}
  		var parts = template.split("{");
  		var textParts = [parts.shift()];
  		var prefixes = [];
  		var substitutions = [];
  		var unSubstitutions = [];
  		var varNames = [];
  		while (parts.length > 0) {
  			var part = parts.shift();
  			var spec = part.split("}")[0];
  			var remainder = part.substring(spec.length + 1);
  			var funcs = uriTemplateSubstitution(spec);
  			substitutions.push(funcs.substitution);
  			unSubstitutions.push(funcs.unSubstitution);
  			prefixes.push(funcs.prefix);
  			textParts.push(remainder);
  			varNames = varNames.concat(funcs.varNames);
  		}
  		this.fill = function (valueFunction) {
  			if (valueFunction && typeof valueFunction !== 'function') {
  				var value = valueFunction;
  				valueFunction = function (varName) {
  					return value[varName];
  				};
  			}
  
  			var result = textParts[0];
  			for (var i = 0; i < substitutions.length; i++) {
  				var substitution = substitutions[i];
  				result += substitution(valueFunction);
  				result += textParts[i + 1];
  			}
  			return result;
  		};
  		this.fromUri = function (substituted, options) {
  			options = options || {};
  			var result = {};
  			for (var i = 0; i < textParts.length; i++) {
  				var part = textParts[i];
  				if (substituted.substring(0, part.length) !== part) {
  					return /*undefined*/;
  				}
  				substituted = substituted.substring(part.length);
  				if (i >= textParts.length - 1) {
  					// We've run out of input - is there any template left?
  					if (substituted == "") {
  						break;
  					} else {
  						return /*undefined*/;
  					}
  				}
  
  				var prefix = prefixes[i];
  				if (prefix && substituted.substring(0, prefix.length) !== prefix) {
  					// All values are optional - if we have a prefix and it doesn't match, move along
  					continue;
  				}
  
  				// Find the next part to un-substitute
  				var nextPart = textParts[i + 1];
  				var offset = i;
  				while (true) {
  					if (offset == textParts.length - 2) {
  						var endPart = substituted.substring(substituted.length - nextPart.length);
  						if (endPart !== nextPart) {
  							return /*undefined*/;
  						}
  						var stringValue = substituted.substring(0, substituted.length - nextPart.length);
  						substituted = endPart;
  					} else if (nextPart) {
  						var nextPartPos = substituted.indexOf(nextPart);
  						var stringValue = substituted.substring(0, nextPartPos);
  						substituted = substituted.substring(nextPartPos);
  					} else if (prefixes[offset + 1]) {
  						var nextPartPos = substituted.indexOf(prefixes[offset + 1]);
  						if (nextPartPos === -1) nextPartPos = substituted.length;
  						var stringValue = substituted.substring(0, nextPartPos);
  						substituted = substituted.substring(nextPartPos);
  					} else if (textParts.length > offset + 2) {
  						// If the separator between this variable and the next is blank (with no prefix), continue onwards
  						offset++;
  						nextPart = textParts[offset + 1];
  						continue;
  					} else {
  						var stringValue = substituted;
  						substituted = "";
  					}
  					break;
  				}
  				if (!unSubstitutions[i](stringValue, result, options.strict)) {
  					return /*undefined*/;
  				}
  			}
  			return result;
  		}
  		this.varNames = varNames;
  		this.template = template;
  	}
  	UriTemplate.prototype = {
  		toString: function () {
  			return this.template;
  		},
  		fillFromObject: function (obj) {
  			return this.fill(obj);
  		},
  		test: function (uri, options) {
  			return !!this.fromUri(uri, options)
  		}
  	};
  
  	return UriTemplate;
  });
  
  },{}],35:[function(require,module,exports){
  var Vue // late bind
  var map = Object.create(null)
  var shimmed = false
  var isBrowserify = false
  
  /**
   * Determine compatibility and apply patch.
   *
   * @param {Function} vue
   * @param {Boolean} browserify
   */
  
  exports.install = function (vue, browserify) {
    if (shimmed) return
    shimmed = true
  
    Vue = vue
    isBrowserify = browserify
  
    exports.compatible = !!Vue.internalDirectives
    if (!exports.compatible) {
      console.warn(
        '[HMR] vue-loader hot reload is only compatible with ' +
        'Vue.js 1.0.0+.'
      )
      return
    }
  
    // patch view directive
    patchView(Vue.internalDirectives.component)
    console.log('[HMR] Vue component hot reload shim applied.')
    // shim router-view if present
    var routerView = Vue.elementDirective('router-view')
    if (routerView) {
      patchView(routerView)
      console.log('[HMR] vue-router <router-view> hot reload shim applied.')
    }
  }
  
  /**
   * Shim the view directive (component or router-view).
   *
   * @param {Object} View
   */
  
  function patchView (View) {
    var unbuild = View.unbuild
    View.unbuild = function (defer) {
      if (!this.hotUpdating) {
        var prevComponent = this.childVM && this.childVM.constructor
        removeView(prevComponent, this)
        // defer = true means we are transitioning to a new
        // Component. Register this new component to the list.
        if (defer) {
          addView(this.Component, this)
        }
      }
      // call original
      return unbuild.call(this, defer)
    }
  }
  
  /**
   * Add a component view to a Component's hot list
   *
   * @param {Function} Component
   * @param {Directive} view - view directive instance
   */
  
  function addView (Component, view) {
    var id = Component && Component.options.hotID
    if (id) {
      if (!map[id]) {
        map[id] = {
          Component: Component,
          views: [],
          instances: []
        }
      }
      map[id].views.push(view)
    }
  }
  
  /**
   * Remove a component view from a Component's hot list
   *
   * @param {Function} Component
   * @param {Directive} view - view directive instance
   */
  
  function removeView (Component, view) {
    var id = Component && Component.options.hotID
    if (id) {
      map[id].views.$remove(view)
    }
  }
  
  /**
   * Create a record for a hot module, which keeps track of its construcotr,
   * instnaces and views (component directives or router-views).
   *
   * @param {String} id
   * @param {Object} options
   */
  
  exports.createRecord = function (id, options) {
    if (typeof options === 'function') {
      options = options.options
    }
    if (typeof options.el !== 'string' && typeof options.data !== 'object') {
      makeOptionsHot(id, options)
      map[id] = {
        Component: null,
        views: [],
        instances: []
      }
    }
  }
  
  /**
   * Make a Component options object hot.
   *
   * @param {String} id
   * @param {Object} options
   */
  
  function makeOptionsHot (id, options) {
    options.hotID = id
    injectHook(options, 'created', function () {
      var record = map[id]
      if (!record.Component) {
        record.Component = this.constructor
      }
      record.instances.push(this)
    })
    injectHook(options, 'beforeDestroy', function () {
      map[id].instances.$remove(this)
    })
  }
  
  /**
   * Inject a hook to a hot reloadable component so that
   * we can keep track of it.
   *
   * @param {Object} options
   * @param {String} name
   * @param {Function} hook
   */
  
  function injectHook (options, name, hook) {
    var existing = options[name]
    options[name] = existing
      ? Array.isArray(existing)
        ? existing.concat(hook)
        : [existing, hook]
      : [hook]
  }
  
  /**
   * Update a hot component.
   *
   * @param {String} id
   * @param {Object|null} newOptions
   * @param {String|null} newTemplate
   */
  
  exports.update = function (id, newOptions, newTemplate) {
    var record = map[id]
    // force full-reload if an instance of the component is active but is not
    // managed by a view
    if (!record || (record.instances.length && !record.views.length)) {
      console.log('[HMR] Root or manually-mounted instance modified. Full reload may be required.')
      if (!isBrowserify) {
        window.location.reload()
      } else {
        // browserify-hmr somehow sends incomplete bundle if we reload here
        return
      }
    }
    if (!isBrowserify) {
      // browserify-hmr already logs this
      console.log('[HMR] Updating component: ' + format(id))
    }
    var Component = record.Component
    // update constructor
    if (newOptions) {
      // in case the user exports a constructor
      Component = record.Component = typeof newOptions === 'function'
        ? newOptions
        : Vue.extend(newOptions)
      makeOptionsHot(id, Component.options)
    }
    if (newTemplate) {
      Component.options.template = newTemplate
    }
    // handle recursive lookup
    if (Component.options.name) {
      Component.options.components[Component.options.name] = Component
    }
    // reset constructor cached linker
    Component.linker = null
    // reload all views
    record.views.forEach(function (view) {
      updateView(view, Component)
    })
    // flush devtools
    if (window.__VUE_DEVTOOLS_GLOBAL_HOOK__) {
      window.__VUE_DEVTOOLS_GLOBAL_HOOK__.emit('flush')
    }
  }
  
  /**
   * Update a component view instance
   *
   * @param {Directive} view
   * @param {Function} Component
   */
  
  function updateView (view, Component) {
    if (!view._bound) {
      return
    }
    view.Component = Component
    view.hotUpdating = true
    // disable transitions
    view.vm._isCompiled = false
    // save state
    var state = extractState(view.childVM)
    // remount, make sure to disable keep-alive
    var keepAlive = view.keepAlive
    view.keepAlive = false
    view.mountComponent()
    view.keepAlive = keepAlive
    // restore state
    restoreState(view.childVM, state, true)
    // re-eanble transitions
    view.vm._isCompiled = true
    view.hotUpdating = false
  }
  
  /**
   * Extract state from a Vue instance.
   *
   * @param {Vue} vm
   * @return {Object}
   */
  
  function extractState (vm) {
    return {
      cid: vm.constructor.cid,
      data: vm.$data,
      children: vm.$children.map(extractState)
    }
  }
  
  /**
   * Restore state to a reloaded Vue instance.
   *
   * @param {Vue} vm
   * @param {Object} state
   */
  
  function restoreState (vm, state, isRoot) {
    var oldAsyncConfig
    if (isRoot) {
      // set Vue into sync mode during state rehydration
      oldAsyncConfig = Vue.config.async
      Vue.config.async = false
    }
    // actual restore
    if (isRoot || !vm._props) {
      vm.$data = state.data
    } else {
      Object.keys(state.data).forEach(function (key) {
        if (!vm._props[key]) {
          // for non-root, only restore non-props fields
          vm.$data[key] = state.data[key]
        }
      })
    }
    // verify child consistency
    var hasSameChildren = vm.$children.every(function (c, i) {
      return state.children[i] && state.children[i].cid === c.constructor.cid
    })
    if (hasSameChildren) {
      // rehydrate children
      vm.$children.forEach(function (c, i) {
        restoreState(c, state.children[i])
      })
    }
    if (isRoot) {
      Vue.config.async = oldAsyncConfig
    }
  }
  
  function format (id) {
    var match = id.match(/[^\/]+\.vue$/)
    return match ? match[0] : id
  }
  
  },{}],36:[function(require,module,exports){
  (function (process,global){
  /*!
   * Vue.js v2.5.3
   * (c) 2014-2017 Evan You
   * Released under the MIT License.
   */
  'use strict';
  
  /*  */
  
  // these helpers produces better vm code in JS engines due to their
  // explicitness and function inlining
  function isUndef (v) {
    return v === undefined || v === null
  }
  
  function isDef (v) {
    return v !== undefined && v !== null
  }
  
  function isTrue (v) {
    return v === true
  }
  
  function isFalse (v) {
    return v === false
  }
  
  /**
   * Check if value is primitive
   */
  function isPrimitive (value) {
    return (
      typeof value === 'string' ||
      typeof value === 'number' ||
      typeof value === 'boolean'
    )
  }
  
  /**
   * Quick object check - this is primarily used to tell
   * Objects from primitive values when we know the value
   * is a JSON-compliant type.
   */
  function isObject (obj) {
    return obj !== null && typeof obj === 'object'
  }
  
  /**
   * Get the raw type string of a value e.g. [object Object]
   */
  var _toString = Object.prototype.toString;
  
  function toRawType (value) {
    return _toString.call(value).slice(8, -1)
  }
  
  /**
   * Strict object type check. Only returns true
   * for plain JavaScript objects.
   */
  function isPlainObject (obj) {
    return _toString.call(obj) === '[object Object]'
  }
  
  function isRegExp (v) {
    return _toString.call(v) === '[object RegExp]'
  }
  
  /**
   * Check if val is a valid array index.
   */
  function isValidArrayIndex (val) {
    var n = parseFloat(String(val));
    return n >= 0 && Math.floor(n) === n && isFinite(val)
  }
  
  /**
   * Convert a value to a string that is actually rendered.
   */
  function toString (val) {
    return val == null
      ? ''
      : typeof val === 'object'
        ? JSON.stringify(val, null, 2)
        : String(val)
  }
  
  /**
   * Convert a input value to a number for persistence.
   * If the conversion fails, return original string.
   */
  function toNumber (val) {
    var n = parseFloat(val);
    return isNaN(n) ? val : n
  }
  
  /**
   * Make a map and return a function for checking if a key
   * is in that map.
   */
  function makeMap (
    str,
    expectsLowerCase
  ) {
    var map = Object.create(null);
    var list = str.split(',');
    for (var i = 0; i < list.length; i++) {
      map[list[i]] = true;
    }
    return expectsLowerCase
      ? function (val) { return map[val.toLowerCase()]; }
      : function (val) { return map[val]; }
  }
  
  /**
   * Check if a tag is a built-in tag.
   */
  var isBuiltInTag = makeMap('slot,component', true);
  
  /**
   * Check if a attribute is a reserved attribute.
   */
  var isReservedAttribute = makeMap('key,ref,slot,slot-scope,is');
  
  /**
   * Remove an item from an array
   */
  function remove (arr, item) {
    if (arr.length) {
      var index = arr.indexOf(item);
      if (index > -1) {
        return arr.splice(index, 1)
      }
    }
  }
  
  /**
   * Check whether the object has the property.
   */
  var hasOwnProperty = Object.prototype.hasOwnProperty;
  function hasOwn (obj, key) {
    return hasOwnProperty.call(obj, key)
  }
  
  /**
   * Create a cached version of a pure function.
   */
  function cached (fn) {
    var cache = Object.create(null);
    return (function cachedFn (str) {
      var hit = cache[str];
      return hit || (cache[str] = fn(str))
    })
  }
  
  /**
   * Camelize a hyphen-delimited string.
   */
  var camelizeRE = /-(\w)/g;
  var camelize = cached(function (str) {
    return str.replace(camelizeRE, function (_, c) { return c ? c.toUpperCase() : ''; })
  });
  
  /**
   * Capitalize a string.
   */
  var capitalize = cached(function (str) {
    return str.charAt(0).toUpperCase() + str.slice(1)
  });
  
  /**
   * Hyphenate a camelCase string.
   */
  var hyphenateRE = /\B([A-Z])/g;
  var hyphenate = cached(function (str) {
    return str.replace(hyphenateRE, '-$1').toLowerCase()
  });
  
  /**
   * Simple bind, faster than native
   */
  function bind (fn, ctx) {
    function boundFn (a) {
      var l = arguments.length;
      return l
        ? l > 1
          ? fn.apply(ctx, arguments)
          : fn.call(ctx, a)
        : fn.call(ctx)
    }
    // record original fn length
    boundFn._length = fn.length;
    return boundFn
  }
  
  /**
   * Convert an Array-like object to a real Array.
   */
  function toArray (list, start) {
    start = start || 0;
    var i = list.length - start;
    var ret = new Array(i);
    while (i--) {
      ret[i] = list[i + start];
    }
    return ret
  }
  
  /**
   * Mix properties into target object.
   */
  function extend (to, _from) {
    for (var key in _from) {
      to[key] = _from[key];
    }
    return to
  }
  
  /**
   * Merge an Array of Objects into a single Object.
   */
  function toObject (arr) {
    var res = {};
    for (var i = 0; i < arr.length; i++) {
      if (arr[i]) {
        extend(res, arr[i]);
      }
    }
    return res
  }
  
  /**
   * Perform no operation.
   * Stubbing args to make Flow happy without leaving useless transpiled code
   * with ...rest (https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/)
   */
  function noop (a, b, c) {}
  
  /**
   * Always return false.
   */
  var no = function (a, b, c) { return false; };
  
  /**
   * Return same value
   */
  var identity = function (_) { return _; };
  
  /**
   * Generate a static keys string from compiler modules.
   */
  function genStaticKeys (modules) {
    return modules.reduce(function (keys, m) {
      return keys.concat(m.staticKeys || [])
    }, []).join(',')
  }
  
  /**
   * Check if two values are loosely equal - that is,
   * if they are plain objects, do they have the same shape?
   */
  function looseEqual (a, b) {
    if (a === b) { return true }
    var isObjectA = isObject(a);
    var isObjectB = isObject(b);
    if (isObjectA && isObjectB) {
      try {
        var isArrayA = Array.isArray(a);
        var isArrayB = Array.isArray(b);
        if (isArrayA && isArrayB) {
          return a.length === b.length && a.every(function (e, i) {
            return looseEqual(e, b[i])
          })
        } else if (!isArrayA && !isArrayB) {
          var keysA = Object.keys(a);
          var keysB = Object.keys(b);
          return keysA.length === keysB.length && keysA.every(function (key) {
            return looseEqual(a[key], b[key])
          })
        } else {
          /* istanbul ignore next */
          return false
        }
      } catch (e) {
        /* istanbul ignore next */
        return false
      }
    } else if (!isObjectA && !isObjectB) {
      return String(a) === String(b)
    } else {
      return false
    }
  }
  
  function looseIndexOf (arr, val) {
    for (var i = 0; i < arr.length; i++) {
      if (looseEqual(arr[i], val)) { return i }
    }
    return -1
  }
  
  /**
   * Ensure a function is called only once.
   */
  function once (fn) {
    var called = false;
    return function () {
      if (!called) {
        called = true;
        fn.apply(this, arguments);
      }
    }
  }
  
  var SSR_ATTR = 'data-server-rendered';
  
  var ASSET_TYPES = [
    'component',
    'directive',
    'filter'
  ];
  
  var LIFECYCLE_HOOKS = [
    'beforeCreate',
    'created',
    'beforeMount',
    'mounted',
    'beforeUpdate',
    'updated',
    'beforeDestroy',
    'destroyed',
    'activated',
    'deactivated',
    'errorCaptured'
  ];
  
  /*  */
  
  var config = ({
    /**
     * Option merge strategies (used in core/util/options)
     */
    optionMergeStrategies: Object.create(null),
  
    /**
     * Whether to suppress warnings.
     */
    silent: false,
  
    /**
     * Show production mode tip message on boot?
     */
    productionTip: process.env.NODE_ENV !== 'production',
  
    /**
     * Whether to enable devtools
     */
    devtools: process.env.NODE_ENV !== 'production',
  
    /**
     * Whether to record perf
     */
    performance: false,
  
    /**
     * Error handler for watcher errors
     */
    errorHandler: null,
  
    /**
     * Warn handler for watcher warns
     */
    warnHandler: null,
  
    /**
     * Ignore certain custom elements
     */
    ignoredElements: [],
  
    /**
     * Custom user key aliases for v-on
     */
    keyCodes: Object.create(null),
  
    /**
     * Check if a tag is reserved so that it cannot be registered as a
     * component. This is platform-dependent and may be overwritten.
     */
    isReservedTag: no,
  
    /**
     * Check if an attribute is reserved so that it cannot be used as a component
     * prop. This is platform-dependent and may be overwritten.
     */
    isReservedAttr: no,
  
    /**
     * Check if a tag is an unknown element.
     * Platform-dependent.
     */
    isUnknownElement: no,
  
    /**
     * Get the namespace of an element
     */
    getTagNamespace: noop,
  
    /**
     * Parse the real tag name for the specific platform.
     */
    parsePlatformTagName: identity,
  
    /**
     * Check if an attribute must be bound using property, e.g. value
     * Platform-dependent.
     */
    mustUseProp: no,
  
    /**
     * Exposed for legacy reasons
     */
    _lifecycleHooks: LIFECYCLE_HOOKS
  });
  
  /*  */
  
  var emptyObject = Object.freeze({});
  
  /**
   * Check if a string starts with $ or _
   */
  function isReserved (str) {
    var c = (str + '').charCodeAt(0);
    return c === 0x24 || c === 0x5F
  }
  
  /**
   * Define a property.
   */
  function def (obj, key, val, enumerable) {
    Object.defineProperty(obj, key, {
      value: val,
      enumerable: !!enumerable,
      writable: true,
      configurable: true
    });
  }
  
  /**
   * Parse simple path.
   */
  var bailRE = /[^\w.$]/;
  function parsePath (path) {
    if (bailRE.test(path)) {
      return
    }
    var segments = path.split('.');
    return function (obj) {
      for (var i = 0; i < segments.length; i++) {
        if (!obj) { return }
        obj = obj[segments[i]];
      }
      return obj
    }
  }
  
  /*  */
  
  // can we use __proto__?
  var hasProto = '__proto__' in {};
  
  // Browser environment sniffing
  var inBrowser = typeof window !== 'undefined';
  var UA = inBrowser && window.navigator.userAgent.toLowerCase();
  var isIE = UA && /msie|trident/.test(UA);
  var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
  var isEdge = UA && UA.indexOf('edge/') > 0;
  var isAndroid = UA && UA.indexOf('android') > 0;
  var isIOS = UA && /iphone|ipad|ipod|ios/.test(UA);
  var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
  
  // Firefox has a "watch" function on Object.prototype...
  var nativeWatch = ({}).watch;
  
  var supportsPassive = false;
  if (inBrowser) {
    try {
      var opts = {};
      Object.defineProperty(opts, 'passive', ({
        get: function get () {
          /* istanbul ignore next */
          supportsPassive = true;
        }
      })); // https://github.com/facebook/flow/issues/285
      window.addEventListener('test-passive', null, opts);
    } catch (e) {}
  }
  
  // this needs to be lazy-evaled because vue may be required before
  // vue-server-renderer can set VUE_ENV
  var _isServer;
  var isServerRendering = function () {
    if (_isServer === undefined) {
      /* istanbul ignore if */
      if (!inBrowser && typeof global !== 'undefined') {
        // detect presence of vue-server-renderer and avoid
        // Webpack shimming the process
        _isServer = global['process'].env.VUE_ENV === 'server';
      } else {
        _isServer = false;
      }
    }
    return _isServer
  };
  
  // detect devtools
  var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;
  
  /* istanbul ignore next */
  function isNative (Ctor) {
    return typeof Ctor === 'function' && /native code/.test(Ctor.toString())
  }
  
  var hasSymbol =
    typeof Symbol !== 'undefined' && isNative(Symbol) &&
    typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);
  
  var _Set;
  /* istanbul ignore if */ // $flow-disable-line
  if (typeof Set !== 'undefined' && isNative(Set)) {
    // use native Set when available.
    _Set = Set;
  } else {
    // a non-standard Set polyfill that only works with primitive keys.
    _Set = (function () {
      function Set () {
        this.set = Object.create(null);
      }
      Set.prototype.has = function has (key) {
        return this.set[key] === true
      };
      Set.prototype.add = function add (key) {
        this.set[key] = true;
      };
      Set.prototype.clear = function clear () {
        this.set = Object.create(null);
      };
  
      return Set;
    }());
  }
  
  /*  */
  
  var warn = noop;
  var tip = noop;
  var generateComponentTrace = (noop); // work around flow check
  var formatComponentName = (noop);
  
  if (process.env.NODE_ENV !== 'production') {
    var hasConsole = typeof console !== 'undefined';
    var classifyRE = /(?:^|[-_])(\w)/g;
    var classify = function (str) { return str
      .replace(classifyRE, function (c) { return c.toUpperCase(); })
      .replace(/[-_]/g, ''); };
  
    warn = function (msg, vm) {
      var trace = vm ? generateComponentTrace(vm) : '';
  
      if (config.warnHandler) {
        config.warnHandler.call(null, msg, vm, trace);
      } else if (hasConsole && (!config.silent)) {
        console.error(("[Vue warn]: " + msg + trace));
      }
    };
  
    tip = function (msg, vm) {
      if (hasConsole && (!config.silent)) {
        console.warn("[Vue tip]: " + msg + (
          vm ? generateComponentTrace(vm) : ''
        ));
      }
    };
  
    formatComponentName = function (vm, includeFile) {
      if (vm.$root === vm) {
        return '<Root>'
      }
      var options = typeof vm === 'function' && vm.cid != null
        ? vm.options
        : vm._isVue
          ? vm.$options || vm.constructor.options
          : vm || {};
      var name = options.name || options._componentTag;
      var file = options.__file;
      if (!name && file) {
        var match = file.match(/([^/\\]+)\.vue$/);
        name = match && match[1];
      }
  
      return (
        (name ? ("<" + (classify(name)) + ">") : "<Anonymous>") +
        (file && includeFile !== false ? (" at " + file) : '')
      )
    };
  
    var repeat = function (str, n) {
      var res = '';
      while (n) {
        if (n % 2 === 1) { res += str; }
        if (n > 1) { str += str; }
        n >>= 1;
      }
      return res
    };
  
    generateComponentTrace = function (vm) {
      if (vm._isVue && vm.$parent) {
        var tree = [];
        var currentRecursiveSequence = 0;
        while (vm) {
          if (tree.length > 0) {
            var last = tree[tree.length - 1];
            if (last.constructor === vm.constructor) {
              currentRecursiveSequence++;
              vm = vm.$parent;
              continue
            } else if (currentRecursiveSequence > 0) {
              tree[tree.length - 1] = [last, currentRecursiveSequence];
              currentRecursiveSequence = 0;
            }
          }
          tree.push(vm);
          vm = vm.$parent;
        }
        return '\n\nfound in\n\n' + tree
          .map(function (vm, i) { return ("" + (i === 0 ? '---> ' : repeat(' ', 5 + i * 2)) + (Array.isArray(vm)
              ? ((formatComponentName(vm[0])) + "... (" + (vm[1]) + " recursive calls)")
              : formatComponentName(vm))); })
          .join('\n')
      } else {
        return ("\n\n(found in " + (formatComponentName(vm)) + ")")
      }
    };
  }
  
  /*  */
  
  
  var uid = 0;
  
  /**
   * A dep is an observable that can have multiple
   * directives subscribing to it.
   */
  var Dep = function Dep () {
    this.id = uid++;
    this.subs = [];
  };
  
  Dep.prototype.addSub = function addSub (sub) {
    this.subs.push(sub);
  };
  
  Dep.prototype.removeSub = function removeSub (sub) {
    remove(this.subs, sub);
  };
  
  Dep.prototype.depend = function depend () {
    if (Dep.target) {
      Dep.target.addDep(this);
    }
  };
  
  Dep.prototype.notify = function notify () {
    // stabilize the subscriber list first
    var subs = this.subs.slice();
    for (var i = 0, l = subs.length; i < l; i++) {
      subs[i].update();
    }
  };
  
  // the current target watcher being evaluated.
  // this is globally unique because there could be only one
  // watcher being evaluated at any time.
  Dep.target = null;
  var targetStack = [];
  
  function pushTarget (_target) {
    if (Dep.target) { targetStack.push(Dep.target); }
    Dep.target = _target;
  }
  
  function popTarget () {
    Dep.target = targetStack.pop();
  }
  
  /*  */
  
  var VNode = function VNode (
    tag,
    data,
    children,
    text,
    elm,
    context,
    componentOptions,
    asyncFactory
  ) {
    this.tag = tag;
    this.data = data;
    this.children = children;
    this.text = text;
    this.elm = elm;
    this.ns = undefined;
    this.context = context;
    this.functionalContext = undefined;
    this.functionalOptions = undefined;
    this.functionalScopeId = undefined;
    this.key = data && data.key;
    this.componentOptions = componentOptions;
    this.componentInstance = undefined;
    this.parent = undefined;
    this.raw = false;
    this.isStatic = false;
    this.isRootInsert = true;
    this.isComment = false;
    this.isCloned = false;
    this.isOnce = false;
    this.asyncFactory = asyncFactory;
    this.asyncMeta = undefined;
    this.isAsyncPlaceholder = false;
  };
  
  var prototypeAccessors = { child: { configurable: true } };
  
  // DEPRECATED: alias for componentInstance for backwards compat.
  /* istanbul ignore next */
  prototypeAccessors.child.get = function () {
    return this.componentInstance
  };
  
  Object.defineProperties( VNode.prototype, prototypeAccessors );
  
  var createEmptyVNode = function (text) {
    if ( text === void 0 ) text = '';
  
    var node = new VNode();
    node.text = text;
    node.isComment = true;
    return node
  };
  
  function createTextVNode (val) {
    return new VNode(undefined, undefined, undefined, String(val))
  }
  
  // optimized shallow clone
  // used for static nodes and slot nodes because they may be reused across
  // multiple renders, cloning them avoids errors when DOM manipulations rely
  // on their elm reference.
  function cloneVNode (vnode, deep) {
    var componentOptions = vnode.componentOptions;
    var cloned = new VNode(
      vnode.tag,
      vnode.data,
      vnode.children,
      vnode.text,
      vnode.elm,
      vnode.context,
      componentOptions,
      vnode.asyncFactory
    );
    cloned.ns = vnode.ns;
    cloned.isStatic = vnode.isStatic;
    cloned.key = vnode.key;
    cloned.isComment = vnode.isComment;
    cloned.isCloned = true;
    if (deep) {
      if (vnode.children) {
        cloned.children = cloneVNodes(vnode.children, true);
      }
      if (componentOptions && componentOptions.children) {
        componentOptions.children = cloneVNodes(componentOptions.children, true);
      }
    }
    return cloned
  }
  
  function cloneVNodes (vnodes, deep) {
    var len = vnodes.length;
    var res = new Array(len);
    for (var i = 0; i < len; i++) {
      res[i] = cloneVNode(vnodes[i], deep);
    }
    return res
  }
  
  /*
   * not type checking this file because flow doesn't play well with
   * dynamically accessing methods on Array prototype
   */
  
  var arrayProto = Array.prototype;
  var arrayMethods = Object.create(arrayProto);[
    'push',
    'pop',
    'shift',
    'unshift',
    'splice',
    'sort',
    'reverse'
  ]
  .forEach(function (method) {
    // cache original method
    var original = arrayProto[method];
    def(arrayMethods, method, function mutator () {
      var args = [], len = arguments.length;
      while ( len-- ) args[ len ] = arguments[ len ];
  
      var result = original.apply(this, args);
      var ob = this.__ob__;
      var inserted;
      switch (method) {
        case 'push':
        case 'unshift':
          inserted = args;
          break
        case 'splice':
          inserted = args.slice(2);
          break
      }
      if (inserted) { ob.observeArray(inserted); }
      // notify change
      ob.dep.notify();
      return result
    });
  });
  
  /*  */
  
  var arrayKeys = Object.getOwnPropertyNames(arrayMethods);
  
  /**
   * By default, when a reactive property is set, the new value is
   * also converted to become reactive. However when passing down props,
   * we don't want to force conversion because the value may be a nested value
   * under a frozen data structure. Converting it would defeat the optimization.
   */
  var observerState = {
    shouldConvert: true
  };
  
  /**
   * Observer class that are attached to each observed
   * object. Once attached, the observer converts target
   * object's property keys into getter/setters that
   * collect dependencies and dispatches updates.
   */
  var Observer = function Observer (value) {
    this.value = value;
    this.dep = new Dep();
    this.vmCount = 0;
    def(value, '__ob__', this);
    if (Array.isArray(value)) {
      var augment = hasProto
        ? protoAugment
        : copyAugment;
      augment(value, arrayMethods, arrayKeys);
      this.observeArray(value);
    } else {
      this.walk(value);
    }
  };
  
  /**
   * Walk through each property and convert them into
   * getter/setters. This method should only be called when
   * value type is Object.
   */
  Observer.prototype.walk = function walk (obj) {
    var keys = Object.keys(obj);
    for (var i = 0; i < keys.length; i++) {
      defineReactive(obj, keys[i], obj[keys[i]]);
    }
  };
  
  /**
   * Observe a list of Array items.
   */
  Observer.prototype.observeArray = function observeArray (items) {
    for (var i = 0, l = items.length; i < l; i++) {
      observe(items[i]);
    }
  };
  
  // helpers
  
  /**
   * Augment an target Object or Array by intercepting
   * the prototype chain using __proto__
   */
  function protoAugment (target, src, keys) {
    /* eslint-disable no-proto */
    target.__proto__ = src;
    /* eslint-enable no-proto */
  }
  
  /**
   * Augment an target Object or Array by defining
   * hidden properties.
   */
  /* istanbul ignore next */
  function copyAugment (target, src, keys) {
    for (var i = 0, l = keys.length; i < l; i++) {
      var key = keys[i];
      def(target, key, src[key]);
    }
  }
  
  /**
   * Attempt to create an observer instance for a value,
   * returns the new observer if successfully observed,
   * or the existing observer if the value already has one.
   */
  function observe (value, asRootData) {
    if (!isObject(value) || value instanceof VNode) {
      return
    }
    var ob;
    if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
      ob = value.__ob__;
    } else if (
      observerState.shouldConvert &&
      !isServerRendering() &&
      (Array.isArray(value) || isPlainObject(value)) &&
      Object.isExtensible(value) &&
      !value._isVue
    ) {
      ob = new Observer(value);
    }
    if (asRootData && ob) {
      ob.vmCount++;
    }
    return ob
  }
  
  /**
   * Define a reactive property on an Object.
   */
  function defineReactive (
    obj,
    key,
    val,
    customSetter,
    shallow
  ) {
    var dep = new Dep();
  
    var property = Object.getOwnPropertyDescriptor(obj, key);
    if (property && property.configurable === false) {
      return
    }
  
    // cater for pre-defined getter/setters
    var getter = property && property.get;
    var setter = property && property.set;
  
    var childOb = !shallow && observe(val);
    Object.defineProperty(obj, key, {
      enumerable: true,
      configurable: true,
      get: function reactiveGetter () {
        var value = getter ? getter.call(obj) : val;
        if (Dep.target) {
          dep.depend();
          if (childOb) {
            childOb.dep.depend();
            if (Array.isArray(value)) {
              dependArray(value);
            }
          }
        }
        return value
      },
      set: function reactiveSetter (newVal) {
        var value = getter ? getter.call(obj) : val;
        /* eslint-disable no-self-compare */
        if (newVal === value || (newVal !== newVal && value !== value)) {
          return
        }
        /* eslint-enable no-self-compare */
        if (process.env.NODE_ENV !== 'production' && customSetter) {
          customSetter();
        }
        if (setter) {
          setter.call(obj, newVal);
        } else {
          val = newVal;
        }
        childOb = !shallow && observe(newVal);
        dep.notify();
      }
    });
  }
  
  /**
   * Set a property on an object. Adds the new property and
   * triggers change notification if the property doesn't
   * already exist.
   */
  function set (target, key, val) {
    if (Array.isArray(target) && isValidArrayIndex(key)) {
      target.length = Math.max(target.length, key);
      target.splice(key, 1, val);
      return val
    }
    if (key in target && !(key in Object.prototype)) {
      target[key] = val;
      return val
    }
    var ob = (target).__ob__;
    if (target._isVue || (ob && ob.vmCount)) {
      process.env.NODE_ENV !== 'production' && warn(
        'Avoid adding reactive properties to a Vue instance or its root $data ' +
        'at runtime - declare it upfront in the data option.'
      );
      return val
    }
    if (!ob) {
      target[key] = val;
      return val
    }
    defineReactive(ob.value, key, val);
    ob.dep.notify();
    return val
  }
  
  /**
   * Delete a property and trigger change if necessary.
   */
  function del (target, key) {
    if (Array.isArray(target) && isValidArrayIndex(key)) {
      target.splice(key, 1);
      return
    }
    var ob = (target).__ob__;
    if (target._isVue || (ob && ob.vmCount)) {
      process.env.NODE_ENV !== 'production' && warn(
        'Avoid deleting properties on a Vue instance or its root $data ' +
        '- just set it to null.'
      );
      return
    }
    if (!hasOwn(target, key)) {
      return
    }
    delete target[key];
    if (!ob) {
      return
    }
    ob.dep.notify();
  }
  
  /**
   * Collect dependencies on array elements when the array is touched, since
   * we cannot intercept array element access like property getters.
   */
  function dependArray (value) {
    for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
      e = value[i];
      e && e.__ob__ && e.__ob__.dep.depend();
      if (Array.isArray(e)) {
        dependArray(e);
      }
    }
  }
  
  /*  */
  
  /**
   * Option overwriting strategies are functions that handle
   * how to merge a parent option value and a child option
   * value into the final value.
   */
  var strats = config.optionMergeStrategies;
  
  /**
   * Options with restrictions
   */
  if (process.env.NODE_ENV !== 'production') {
    strats.el = strats.propsData = function (parent, child, vm, key) {
      if (!vm) {
        warn(
          "option \"" + key + "\" can only be used during instance " +
          'creation with the `new` keyword.'
        );
      }
      return defaultStrat(parent, child)
    };
  }
  
  /**
   * Helper that recursively merges two data objects together.
   */
  function mergeData (to, from) {
    if (!from) { return to }
    var key, toVal, fromVal;
    var keys = Object.keys(from);
    for (var i = 0; i < keys.length; i++) {
      key = keys[i];
      toVal = to[key];
      fromVal = from[key];
      if (!hasOwn(to, key)) {
        set(to, key, fromVal);
      } else if (isPlainObject(toVal) && isPlainObject(fromVal)) {
        mergeData(toVal, fromVal);
      }
    }
    return to
  }
  
  /**
   * Data
   */
  function mergeDataOrFn (
    parentVal,
    childVal,
    vm
  ) {
    if (!vm) {
      // in a Vue.extend merge, both should be functions
      if (!childVal) {
        return parentVal
      }
      if (!parentVal) {
        return childVal
      }
      // when parentVal & childVal are both present,
      // we need to return a function that returns the
      // merged result of both functions... no need to
      // check if parentVal is a function here because
      // it has to be a function to pass previous merges.
      return function mergedDataFn () {
        return mergeData(
          typeof childVal === 'function' ? childVal.call(this) : childVal,
          typeof parentVal === 'function' ? parentVal.call(this) : parentVal
        )
      }
    } else {
      return function mergedInstanceDataFn () {
        // instance merge
        var instanceData = typeof childVal === 'function'
          ? childVal.call(vm)
          : childVal;
        var defaultData = typeof parentVal === 'function'
          ? parentVal.call(vm)
          : parentVal;
        if (instanceData) {
          return mergeData(instanceData, defaultData)
        } else {
          return defaultData
        }
      }
    }
  }
  
  strats.data = function (
    parentVal,
    childVal,
    vm
  ) {
    if (!vm) {
      if (childVal && typeof childVal !== 'function') {
        process.env.NODE_ENV !== 'production' && warn(
          'The "data" option should be a function ' +
          'that returns a per-instance value in component ' +
          'definitions.',
          vm
        );
  
        return parentVal
      }
      return mergeDataOrFn(parentVal, childVal)
    }
  
    return mergeDataOrFn(parentVal, childVal, vm)
  };
  
  /**
   * Hooks and props are merged as arrays.
   */
  function mergeHook (
    parentVal,
    childVal
  ) {
    return childVal
      ? parentVal
        ? parentVal.concat(childVal)
        : Array.isArray(childVal)
          ? childVal
          : [childVal]
      : parentVal
  }
  
  LIFECYCLE_HOOKS.forEach(function (hook) {
    strats[hook] = mergeHook;
  });
  
  /**
   * Assets
   *
   * When a vm is present (instance creation), we need to do
   * a three-way merge between constructor options, instance
   * options and parent options.
   */
  function mergeAssets (
    parentVal,
    childVal,
    vm,
    key
  ) {
    var res = Object.create(parentVal || null);
    if (childVal) {
      process.env.NODE_ENV !== 'production' && assertObjectType(key, childVal, vm);
      return extend(res, childVal)
    } else {
      return res
    }
  }
  
  ASSET_TYPES.forEach(function (type) {
    strats[type + 's'] = mergeAssets;
  });
  
  /**
   * Watchers.
   *
   * Watchers hashes should not overwrite one
   * another, so we merge them as arrays.
   */
  strats.watch = function (
    parentVal,
    childVal,
    vm,
    key
  ) {
    // work around Firefox's Object.prototype.watch...
    if (parentVal === nativeWatch) { parentVal = undefined; }
    if (childVal === nativeWatch) { childVal = undefined; }
    /* istanbul ignore if */
    if (!childVal) { return Object.create(parentVal || null) }
    if (process.env.NODE_ENV !== 'production') {
      assertObjectType(key, childVal, vm);
    }
    if (!parentVal) { return childVal }
    var ret = {};
    extend(ret, parentVal);
    for (var key$1 in childVal) {
      var parent = ret[key$1];
      var child = childVal[key$1];
      if (parent && !Array.isArray(parent)) {
        parent = [parent];
      }
      ret[key$1] = parent
        ? parent.concat(child)
        : Array.isArray(child) ? child : [child];
    }
    return ret
  };
  
  /**
   * Other object hashes.
   */
  strats.props =
  strats.methods =
  strats.inject =
  strats.computed = function (
    parentVal,
    childVal,
    vm,
    key
  ) {
    if (childVal && process.env.NODE_ENV !== 'production') {
      assertObjectType(key, childVal, vm);
    }
    if (!parentVal) { return childVal }
    var ret = Object.create(null);
    extend(ret, parentVal);
    if (childVal) { extend(ret, childVal); }
    return ret
  };
  strats.provide = mergeDataOrFn;
  
  /**
   * Default strategy.
   */
  var defaultStrat = function (parentVal, childVal) {
    return childVal === undefined
      ? parentVal
      : childVal
  };
  
  /**
   * Validate component names
   */
  function checkComponents (options) {
    for (var key in options.components) {
      var lower = key.toLowerCase();
      if (isBuiltInTag(lower) || config.isReservedTag(lower)) {
        warn(
          'Do not use built-in or reserved HTML elements as component ' +
          'id: ' + key
        );
      }
    }
  }
  
  /**
   * Ensure all props option syntax are normalized into the
   * Object-based format.
   */
  function normalizeProps (options, vm) {
    var props = options.props;
    if (!props) { return }
    var res = {};
    var i, val, name;
    if (Array.isArray(props)) {
      i = props.length;
      while (i--) {
        val = props[i];
        if (typeof val === 'string') {
          name = camelize(val);
          res[name] = { type: null };
        } else if (process.env.NODE_ENV !== 'production') {
          warn('props must be strings when using array syntax.');
        }
      }
    } else if (isPlainObject(props)) {
      for (var key in props) {
        val = props[key];
        name = camelize(key);
        res[name] = isPlainObject(val)
          ? val
          : { type: val };
      }
    } else if (process.env.NODE_ENV !== 'production') {
      warn(
        "Invalid value for option \"props\": expected an Array or an Object, " +
        "but got " + (toRawType(props)) + ".",
        vm
      );
    }
    options.props = res;
  }
  
  /**
   * Normalize all injections into Object-based format
   */
  function normalizeInject (options, vm) {
    var inject = options.inject;
    var normalized = options.inject = {};
    if (Array.isArray(inject)) {
      for (var i = 0; i < inject.length; i++) {
        normalized[inject[i]] = { from: inject[i] };
      }
    } else if (isPlainObject(inject)) {
      for (var key in inject) {
        var val = inject[key];
        normalized[key] = isPlainObject(val)
          ? extend({ from: key }, val)
          : { from: val };
      }
    } else if (process.env.NODE_ENV !== 'production' && inject) {
      warn(
        "Invalid value for option \"inject\": expected an Array or an Object, " +
        "but got " + (toRawType(inject)) + ".",
        vm
      );
    }
  }
  
  /**
   * Normalize raw function directives into object format.
   */
  function normalizeDirectives (options) {
    var dirs = options.directives;
    if (dirs) {
      for (var key in dirs) {
        var def = dirs[key];
        if (typeof def === 'function') {
          dirs[key] = { bind: def, update: def };
        }
      }
    }
  }
  
  function assertObjectType (name, value, vm) {
    if (!isPlainObject(value)) {
      warn(
        "Invalid value for option \"" + name + "\": expected an Object, " +
        "but got " + (toRawType(value)) + ".",
        vm
      );
    }
  }
  
  /**
   * Merge two option objects into a new one.
   * Core utility used in both instantiation and inheritance.
   */
  function mergeOptions (
    parent,
    child,
    vm
  ) {
    if (process.env.NODE_ENV !== 'production') {
      checkComponents(child);
    }
  
    if (typeof child === 'function') {
      child = child.options;
    }
  
    normalizeProps(child, vm);
    normalizeInject(child, vm);
    normalizeDirectives(child);
    var extendsFrom = child.extends;
    if (extendsFrom) {
      parent = mergeOptions(parent, extendsFrom, vm);
    }
    if (child.mixins) {
      for (var i = 0, l = child.mixins.length; i < l; i++) {
        parent = mergeOptions(parent, child.mixins[i], vm);
      }
    }
    var options = {};
    var key;
    for (key in parent) {
      mergeField(key);
    }
    for (key in child) {
      if (!hasOwn(parent, key)) {
        mergeField(key);
      }
    }
    function mergeField (key) {
      var strat = strats[key] || defaultStrat;
      options[key] = strat(parent[key], child[key], vm, key);
    }
    return options
  }
  
  /**
   * Resolve an asset.
   * This function is used because child instances need access
   * to assets defined in its ancestor chain.
   */
  function resolveAsset (
    options,
    type,
    id,
    warnMissing
  ) {
    /* istanbul ignore if */
    if (typeof id !== 'string') {
      return
    }
    var assets = options[type];
    // check local registration variations first
    if (hasOwn(assets, id)) { return assets[id] }
    var camelizedId = camelize(id);
    if (hasOwn(assets, camelizedId)) { return assets[camelizedId] }
    var PascalCaseId = capitalize(camelizedId);
    if (hasOwn(assets, PascalCaseId)) { return assets[PascalCaseId] }
    // fallback to prototype chain
    var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
    if (process.env.NODE_ENV !== 'production' && warnMissing && !res) {
      warn(
        'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
        options
      );
    }
    return res
  }
  
  /*  */
  
  function validateProp (
    key,
    propOptions,
    propsData,
    vm
  ) {
    var prop = propOptions[key];
    var absent = !hasOwn(propsData, key);
    var value = propsData[key];
    // handle boolean props
    if (isType(Boolean, prop.type)) {
      if (absent && !hasOwn(prop, 'default')) {
        value = false;
      } else if (!isType(String, prop.type) && (value === '' || value === hyphenate(key))) {
        value = true;
      }
    }
    // check default value
    if (value === undefined) {
      value = getPropDefaultValue(vm, prop, key);
      // since the default value is a fresh copy,
      // make sure to observe it.
      var prevShouldConvert = observerState.shouldConvert;
      observerState.shouldConvert = true;
      observe(value);
      observerState.shouldConvert = prevShouldConvert;
    }
    if (process.env.NODE_ENV !== 'production') {
      assertProp(prop, key, value, vm, absent);
    }
    return value
  }
  
  /**
   * Get the default value of a prop.
   */
  function getPropDefaultValue (vm, prop, key) {
    // no default, return undefined
    if (!hasOwn(prop, 'default')) {
      return undefined
    }
    var def = prop.default;
    // warn against non-factory defaults for Object & Array
    if (process.env.NODE_ENV !== 'production' && isObject(def)) {
      warn(
        'Invalid default value for prop "' + key + '": ' +
        'Props with type Object/Array must use a factory function ' +
        'to return the default value.',
        vm
      );
    }
    // the raw prop value was also undefined from previous render,
    // return previous default value to avoid unnecessary watcher trigger
    if (vm && vm.$options.propsData &&
      vm.$options.propsData[key] === undefined &&
      vm._props[key] !== undefined
    ) {
      return vm._props[key]
    }
    // call factory function for non-Function types
    // a value is Function if its prototype is function even across different execution context
    return typeof def === 'function' && getType(prop.type) !== 'Function'
      ? def.call(vm)
      : def
  }
  
  /**
   * Assert whether a prop is valid.
   */
  function assertProp (
    prop,
    name,
    value,
    vm,
    absent
  ) {
    if (prop.required && absent) {
      warn(
        'Missing required prop: "' + name + '"',
        vm
      );
      return
    }
    if (value == null && !prop.required) {
      return
    }
    var type = prop.type;
    var valid = !type || type === true;
    var expectedTypes = [];
    if (type) {
      if (!Array.isArray(type)) {
        type = [type];
      }
      for (var i = 0; i < type.length && !valid; i++) {
        var assertedType = assertType(value, type[i]);
        expectedTypes.push(assertedType.expectedType || '');
        valid = assertedType.valid;
      }
    }
    if (!valid) {
      warn(
        "Invalid prop: type check failed for prop \"" + name + "\"." +
        " Expected " + (expectedTypes.map(capitalize).join(', ')) +
        ", got " + (toRawType(value)) + ".",
        vm
      );
      return
    }
    var validator = prop.validator;
    if (validator) {
      if (!validator(value)) {
        warn(
          'Invalid prop: custom validator check failed for prop "' + name + '".',
          vm
        );
      }
    }
  }
  
  var simpleCheckRE = /^(String|Number|Boolean|Function|Symbol)$/;
  
  function assertType (value, type) {
    var valid;
    var expectedType = getType(type);
    if (simpleCheckRE.test(expectedType)) {
      var t = typeof value;
      valid = t === expectedType.toLowerCase();
      // for primitive wrapper objects
      if (!valid && t === 'object') {
        valid = value instanceof type;
      }
    } else if (expectedType === 'Object') {
      valid = isPlainObject(value);
    } else if (expectedType === 'Array') {
      valid = Array.isArray(value);
    } else {
      valid = value instanceof type;
    }
    return {
      valid: valid,
      expectedType: expectedType
    }
  }
  
  /**
   * Use function string name to check built-in types,
   * because a simple equality check will fail when running
   * across different vms / iframes.
   */
  function getType (fn) {
    var match = fn && fn.toString().match(/^\s*function (\w+)/);
    return match ? match[1] : ''
  }
  
  function isType (type, fn) {
    if (!Array.isArray(fn)) {
      return getType(fn) === getType(type)
    }
    for (var i = 0, len = fn.length; i < len; i++) {
      if (getType(fn[i]) === getType(type)) {
        return true
      }
    }
    /* istanbul ignore next */
    return false
  }
  
  /*  */
  
  function handleError (err, vm, info) {
    if (vm) {
      var cur = vm;
      while ((cur = cur.$parent)) {
        var hooks = cur.$options.errorCaptured;
        if (hooks) {
          for (var i = 0; i < hooks.length; i++) {
            try {
              var capture = hooks[i].call(cur, err, vm, info) === false;
              if (capture) { return }
            } catch (e) {
              globalHandleError(e, cur, 'errorCaptured hook');
            }
          }
        }
      }
    }
    globalHandleError(err, vm, info);
  }
  
  function globalHandleError (err, vm, info) {
    if (config.errorHandler) {
      try {
        return config.errorHandler.call(null, err, vm, info)
      } catch (e) {
        logError(e, null, 'config.errorHandler');
      }
    }
    logError(err, vm, info);
  }
  
  function logError (err, vm, info) {
    if (process.env.NODE_ENV !== 'production') {
      warn(("Error in " + info + ": \"" + (err.toString()) + "\""), vm);
    }
    /* istanbul ignore else */
    if (inBrowser && typeof console !== 'undefined') {
      console.error(err);
    } else {
      throw err
    }
  }
  
  /*  */
  /* globals MessageChannel */
  
  var callbacks = [];
  var pending = false;
  
  function flushCallbacks () {
    pending = false;
    var copies = callbacks.slice(0);
    callbacks.length = 0;
    for (var i = 0; i < copies.length; i++) {
      copies[i]();
    }
  }
  
  // Here we have async deferring wrappers using both micro and macro tasks.
  // In < 2.4 we used micro tasks everywhere, but there are some scenarios where
  // micro tasks have too high a priority and fires in between supposedly
  // sequential events (e.g. #4521, #6690) or even between bubbling of the same
  // event (#6566). However, using macro tasks everywhere also has subtle problems
  // when state is changed right before repaint (e.g. #6813, out-in transitions).
  // Here we use micro task by default, but expose a way to force macro task when
  // needed (e.g. in event handlers attached by v-on).
  var microTimerFunc;
  var macroTimerFunc;
  var useMacroTask = false;
  
  // Determine (macro) Task defer implementation.
  // Technically setImmediate should be the ideal choice, but it's only available
  // in IE. The only polyfill that consistently queues the callback after all DOM
  // events triggered in the same loop is by using MessageChannel.
  /* istanbul ignore if */
  if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) {
    macroTimerFunc = function () {
      setImmediate(flushCallbacks);
    };
  } else if (typeof MessageChannel !== 'undefined' && (
    isNative(MessageChannel) ||
    // PhantomJS
    MessageChannel.toString() === '[object MessageChannelConstructor]'
  )) {
    var channel = new MessageChannel();
    var port = channel.port2;
    channel.port1.onmessage = flushCallbacks;
    macroTimerFunc = function () {
      port.postMessage(1);
    };
  } else {
    /* istanbul ignore next */
    macroTimerFunc = function () {
      setTimeout(flushCallbacks, 0);
    };
  }
  
  // Determine MicroTask defer implementation.
  /* istanbul ignore next, $flow-disable-line */
  if (typeof Promise !== 'undefined' && isNative(Promise)) {
    var p = Promise.resolve();
    microTimerFunc = function () {
      p.then(flushCallbacks);
      // in problematic UIWebViews, Promise.then doesn't completely break, but
      // it can get stuck in a weird state where callbacks are pushed into the
      // microtask queue but the queue isn't being flushed, until the browser
      // needs to do some other work, e.g. handle a timer. Therefore we can
      // "force" the microtask queue to be flushed by adding an empty timer.
      if (isIOS) { setTimeout(noop); }
    };
  } else {
    // fallback to macro
    microTimerFunc = macroTimerFunc;
  }
  
  /**
   * Wrap a function so that if any code inside triggers state change,
   * the changes are queued using a Task instead of a MicroTask.
   */
  function withMacroTask (fn) {
    return fn._withTask || (fn._withTask = function () {
      useMacroTask = true;
      var res = fn.apply(null, arguments);
      useMacroTask = false;
      return res
    })
  }
  
  function nextTick (cb, ctx) {
    var _resolve;
    callbacks.push(function () {
      if (cb) {
        try {
          cb.call(ctx);
        } catch (e) {
          handleError(e, ctx, 'nextTick');
        }
      } else if (_resolve) {
        _resolve(ctx);
      }
    });
    if (!pending) {
      pending = true;
      if (useMacroTask) {
        macroTimerFunc();
      } else {
        microTimerFunc();
      }
    }
    // $flow-disable-line
    if (!cb && typeof Promise !== 'undefined') {
      return new Promise(function (resolve) {
        _resolve = resolve;
      })
    }
  }
  
  /*  */
  
  var mark;
  var measure;
  
  if (process.env.NODE_ENV !== 'production') {
    var perf = inBrowser && window.performance;
    /* istanbul ignore if */
    if (
      perf &&
      perf.mark &&
      perf.measure &&
      perf.clearMarks &&
      perf.clearMeasures
    ) {
      mark = function (tag) { return perf.mark(tag); };
      measure = function (name, startTag, endTag) {
        perf.measure(name, startTag, endTag);
        perf.clearMarks(startTag);
        perf.clearMarks(endTag);
        perf.clearMeasures(name);
      };
    }
  }
  
  /* not type checking this file because flow doesn't play well with Proxy */
  
  var initProxy;
  
  if (process.env.NODE_ENV !== 'production') {
    var allowedGlobals = makeMap(
      'Infinity,undefined,NaN,isFinite,isNaN,' +
      'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
      'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +
      'require' // for Webpack/Browserify
    );
  
    var warnNonPresent = function (target, key) {
      warn(
        "Property or method \"" + key + "\" is not defined on the instance but " +
        'referenced during render. Make sure that this property is reactive, ' +
        'either in the data option, or for class-based components, by ' +
        'initializing the property. ' +
        'See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.',
        target
      );
    };
  
    var hasProxy =
      typeof Proxy !== 'undefined' &&
      Proxy.toString().match(/native code/);
  
    if (hasProxy) {
      var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta,exact');
      config.keyCodes = new Proxy(config.keyCodes, {
        set: function set (target, key, value) {
          if (isBuiltInModifier(key)) {
            warn(("Avoid overwriting built-in modifier in config.keyCodes: ." + key));
            return false
          } else {
            target[key] = value;
            return true
          }
        }
      });
    }
  
    var hasHandler = {
      has: function has (target, key) {
        var has = key in target;
        var isAllowed = allowedGlobals(key) || key.charAt(0) === '_';
        if (!has && !isAllowed) {
          warnNonPresent(target, key);
        }
        return has || !isAllowed
      }
    };
  
    var getHandler = {
      get: function get (target, key) {
        if (typeof key === 'string' && !(key in target)) {
          warnNonPresent(target, key);
        }
        return target[key]
      }
    };
  
    initProxy = function initProxy (vm) {
      if (hasProxy) {
        // determine which proxy handler to use
        var options = vm.$options;
        var handlers = options.render && options.render._withStripped
          ? getHandler
          : hasHandler;
        vm._renderProxy = new Proxy(vm, handlers);
      } else {
        vm._renderProxy = vm;
      }
    };
  }
  
  /*  */
  
  var normalizeEvent = cached(function (name) {
    var passive = name.charAt(0) === '&';
    name = passive ? name.slice(1) : name;
    var once$$1 = name.charAt(0) === '~'; // Prefixed last, checked first
    name = once$$1 ? name.slice(1) : name;
    var capture = name.charAt(0) === '!';
    name = capture ? name.slice(1) : name;
    return {
      name: name,
      once: once$$1,
      capture: capture,
      passive: passive
    }
  });
  
  function createFnInvoker (fns) {
    function invoker () {
      var arguments$1 = arguments;
  
      var fns = invoker.fns;
      if (Array.isArray(fns)) {
        var cloned = fns.slice();
        for (var i = 0; i < cloned.length; i++) {
          cloned[i].apply(null, arguments$1);
        }
      } else {
        // return handler return value for single handlers
        return fns.apply(null, arguments)
      }
    }
    invoker.fns = fns;
    return invoker
  }
  
  function updateListeners (
    on,
    oldOn,
    add,
    remove$$1,
    vm
  ) {
    var name, cur, old, event;
    for (name in on) {
      cur = on[name];
      old = oldOn[name];
      event = normalizeEvent(name);
      if (isUndef(cur)) {
        process.env.NODE_ENV !== 'production' && warn(
          "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
          vm
        );
      } else if (isUndef(old)) {
        if (isUndef(cur.fns)) {
          cur = on[name] = createFnInvoker(cur);
        }
        add(event.name, cur, event.once, event.capture, event.passive);
      } else if (cur !== old) {
        old.fns = cur;
        on[name] = old;
      }
    }
    for (name in oldOn) {
      if (isUndef(on[name])) {
        event = normalizeEvent(name);
        remove$$1(event.name, oldOn[name], event.capture);
      }
    }
  }
  
  /*  */
  
  function mergeVNodeHook (def, hookKey, hook) {
    if (def instanceof VNode) {
      def = def.data.hook || (def.data.hook = {});
    }
    var invoker;
    var oldHook = def[hookKey];
  
    function wrappedHook () {
      hook.apply(this, arguments);
      // important: remove merged hook to ensure it's called only once
      // and prevent memory leak
      remove(invoker.fns, wrappedHook);
    }
  
    if (isUndef(oldHook)) {
      // no existing hook
      invoker = createFnInvoker([wrappedHook]);
    } else {
      /* istanbul ignore if */
      if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {
        // already a merged invoker
        invoker = oldHook;
        invoker.fns.push(wrappedHook);
      } else {
        // existing plain hook
        invoker = createFnInvoker([oldHook, wrappedHook]);
      }
    }
  
    invoker.merged = true;
    def[hookKey] = invoker;
  }
  
  /*  */
  
  function extractPropsFromVNodeData (
    data,
    Ctor,
    tag
  ) {
    // we are only extracting raw values here.
    // validation and default values are handled in the child
    // component itself.
    var propOptions = Ctor.options.props;
    if (isUndef(propOptions)) {
      return
    }
    var res = {};
    var attrs = data.attrs;
    var props = data.props;
    if (isDef(attrs) || isDef(props)) {
      for (var key in propOptions) {
        var altKey = hyphenate(key);
        if (process.env.NODE_ENV !== 'production') {
          var keyInLowerCase = key.toLowerCase();
          if (
            key !== keyInLowerCase &&
            attrs && hasOwn(attrs, keyInLowerCase)
          ) {
            tip(
              "Prop \"" + keyInLowerCase + "\" is passed to component " +
              (formatComponentName(tag || Ctor)) + ", but the declared prop name is" +
              " \"" + key + "\". " +
              "Note that HTML attributes are case-insensitive and camelCased " +
              "props need to use their kebab-case equivalents when using in-DOM " +
              "templates. You should probably use \"" + altKey + "\" instead of \"" + key + "\"."
            );
          }
        }
        checkProp(res, props, key, altKey, true) ||
        checkProp(res, attrs, key, altKey, false);
      }
    }
    return res
  }
  
  function checkProp (
    res,
    hash,
    key,
    altKey,
    preserve
  ) {
    if (isDef(hash)) {
      if (hasOwn(hash, key)) {
        res[key] = hash[key];
        if (!preserve) {
          delete hash[key];
        }
        return true
      } else if (hasOwn(hash, altKey)) {
        res[key] = hash[altKey];
        if (!preserve) {
          delete hash[altKey];
        }
        return true
      }
    }
    return false
  }
  
  /*  */
  
  // The template compiler attempts to minimize the need for normalization by
  // statically analyzing the template at compile time.
  //
  // For plain HTML markup, normalization can be completely skipped because the
  // generated render function is guaranteed to return Array<VNode>. There are
  // two cases where extra normalization is needed:
  
  // 1. When the children contains components - because a functional component
  // may return an Array instead of a single root. In this case, just a simple
  // normalization is needed - if any child is an Array, we flatten the whole
  // thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
  // because functional components already normalize their own children.
  function simpleNormalizeChildren (children) {
    for (var i = 0; i < children.length; i++) {
      if (Array.isArray(children[i])) {
        return Array.prototype.concat.apply([], children)
      }
    }
    return children
  }
  
  // 2. When the children contains constructs that always generated nested Arrays,
  // e.g. <template>, <slot>, v-for, or when the children is provided by user
  // with hand-written render functions / JSX. In such cases a full normalization
  // is needed to cater to all possible types of children values.
  function normalizeChildren (children) {
    return isPrimitive(children)
      ? [createTextVNode(children)]
      : Array.isArray(children)
        ? normalizeArrayChildren(children)
        : undefined
  }
  
  function isTextNode (node) {
    return isDef(node) && isDef(node.text) && isFalse(node.isComment)
  }
  
  function normalizeArrayChildren (children, nestedIndex) {
    var res = [];
    var i, c, lastIndex, last;
    for (i = 0; i < children.length; i++) {
      c = children[i];
      if (isUndef(c) || typeof c === 'boolean') { continue }
      lastIndex = res.length - 1;
      last = res[lastIndex];
      //  nested
      if (Array.isArray(c)) {
        if (c.length > 0) {
          c = normalizeArrayChildren(c, ((nestedIndex || '') + "_" + i));
          // merge adjacent text nodes
          if (isTextNode(c[0]) && isTextNode(last)) {
            res[lastIndex] = createTextVNode(last.text + (c[0]).text);
            c.shift();
          }
          res.push.apply(res, c);
        }
      } else if (isPrimitive(c)) {
        if (isTextNode(last)) {
          // merge adjacent text nodes
          // this is necessary for SSR hydration because text nodes are
          // essentially merged when rendered to HTML strings
          res[lastIndex] = createTextVNode(last.text + c);
        } else if (c !== '') {
          // convert primitive to vnode
          res.push(createTextVNode(c));
        }
      } else {
        if (isTextNode(c) && isTextNode(last)) {
          // merge adjacent text nodes
          res[lastIndex] = createTextVNode(last.text + c.text);
        } else {
          // default key for nested array children (likely generated by v-for)
          if (isTrue(children._isVList) &&
            isDef(c.tag) &&
            isUndef(c.key) &&
            isDef(nestedIndex)) {
            c.key = "__vlist" + nestedIndex + "_" + i + "__";
          }
          res.push(c);
        }
      }
    }
    return res
  }
  
  /*  */
  
  function ensureCtor (comp, base) {
    if (
      comp.__esModule ||
      (hasSymbol && comp[Symbol.toStringTag] === 'Module')
    ) {
      comp = comp.default;
    }
    return isObject(comp)
      ? base.extend(comp)
      : comp
  }
  
  function createAsyncPlaceholder (
    factory,
    data,
    context,
    children,
    tag
  ) {
    var node = createEmptyVNode();
    node.asyncFactory = factory;
    node.asyncMeta = { data: data, context: context, children: children, tag: tag };
    return node
  }
  
  function resolveAsyncComponent (
    factory,
    baseCtor,
    context
  ) {
    if (isTrue(factory.error) && isDef(factory.errorComp)) {
      return factory.errorComp
    }
  
    if (isDef(factory.resolved)) {
      return factory.resolved
    }
  
    if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
      return factory.loadingComp
    }
  
    if (isDef(factory.contexts)) {
      // already pending
      factory.contexts.push(context);
    } else {
      var contexts = factory.contexts = [context];
      var sync = true;
  
      var forceRender = function () {
        for (var i = 0, l = contexts.length; i < l; i++) {
          contexts[i].$forceUpdate();
        }
      };
  
      var resolve = once(function (res) {
        // cache resolved
        factory.resolved = ensureCtor(res, baseCtor);
        // invoke callbacks only if this is not a synchronous resolve
        // (async resolves are shimmed as synchronous during SSR)
        if (!sync) {
          forceRender();
        }
      });
  
      var reject = once(function (reason) {
        process.env.NODE_ENV !== 'production' && warn(
          "Failed to resolve async component: " + (String(factory)) +
          (reason ? ("\nReason: " + reason) : '')
        );
        if (isDef(factory.errorComp)) {
          factory.error = true;
          forceRender();
        }
      });
  
      var res = factory(resolve, reject);
  
      if (isObject(res)) {
        if (typeof res.then === 'function') {
          // () => Promise
          if (isUndef(factory.resolved)) {
            res.then(resolve, reject);
          }
        } else if (isDef(res.component) && typeof res.component.then === 'function') {
          res.component.then(resolve, reject);
  
          if (isDef(res.error)) {
            factory.errorComp = ensureCtor(res.error, baseCtor);
          }
  
          if (isDef(res.loading)) {
            factory.loadingComp = ensureCtor(res.loading, baseCtor);
            if (res.delay === 0) {
              factory.loading = true;
            } else {
              setTimeout(function () {
                if (isUndef(factory.resolved) && isUndef(factory.error)) {
                  factory.loading = true;
                  forceRender();
                }
              }, res.delay || 200);
            }
          }
  
          if (isDef(res.timeout)) {
            setTimeout(function () {
              if (isUndef(factory.resolved)) {
                reject(
                  process.env.NODE_ENV !== 'production'
                    ? ("timeout (" + (res.timeout) + "ms)")
                    : null
                );
              }
            }, res.timeout);
          }
        }
      }
  
      sync = false;
      // return in case resolved synchronously
      return factory.loading
        ? factory.loadingComp
        : factory.resolved
    }
  }
  
  /*  */
  
  function isAsyncPlaceholder (node) {
    return node.isComment && node.asyncFactory
  }
  
  /*  */
  
  function getFirstComponentChild (children) {
    if (Array.isArray(children)) {
      for (var i = 0; i < children.length; i++) {
        var c = children[i];
        if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
          return c
        }
      }
    }
  }
  
  /*  */
  
  /*  */
  
  function initEvents (vm) {
    vm._events = Object.create(null);
    vm._hasHookEvent = false;
    // init parent attached events
    var listeners = vm.$options._parentListeners;
    if (listeners) {
      updateComponentListeners(vm, listeners);
    }
  }
  
  var target;
  
  function add (event, fn, once) {
    if (once) {
      target.$once(event, fn);
    } else {
      target.$on(event, fn);
    }
  }
  
  function remove$1 (event, fn) {
    target.$off(event, fn);
  }
  
  function updateComponentListeners (
    vm,
    listeners,
    oldListeners
  ) {
    target = vm;
    updateListeners(listeners, oldListeners || {}, add, remove$1, vm);
    target = undefined;
  }
  
  function eventsMixin (Vue) {
    var hookRE = /^hook:/;
    Vue.prototype.$on = function (event, fn) {
      var this$1 = this;
  
      var vm = this;
      if (Array.isArray(event)) {
        for (var i = 0, l = event.length; i < l; i++) {
          this$1.$on(event[i], fn);
        }
      } else {
        (vm._events[event] || (vm._events[event] = [])).push(fn);
        // optimize hook:event cost by using a boolean flag marked at registration
        // instead of a hash lookup
        if (hookRE.test(event)) {
          vm._hasHookEvent = true;
        }
      }
      return vm
    };
  
    Vue.prototype.$once = function (event, fn) {
      var vm = this;
      function on () {
        vm.$off(event, on);
        fn.apply(vm, arguments);
      }
      on.fn = fn;
      vm.$on(event, on);
      return vm
    };
  
    Vue.prototype.$off = function (event, fn) {
      var this$1 = this;
  
      var vm = this;
      // all
      if (!arguments.length) {
        vm._events = Object.create(null);
        return vm
      }
      // array of events
      if (Array.isArray(event)) {
        for (var i = 0, l = event.length; i < l; i++) {
          this$1.$off(event[i], fn);
        }
        return vm
      }
      // specific event
      var cbs = vm._events[event];
      if (!cbs) {
        return vm
      }
      if (!fn) {
        vm._events[event] = null;
        return vm
      }
      if (fn) {
        // specific handler
        var cb;
        var i$1 = cbs.length;
        while (i$1--) {
          cb = cbs[i$1];
          if (cb === fn || cb.fn === fn) {
            cbs.splice(i$1, 1);
            break
          }
        }
      }
      return vm
    };
  
    Vue.prototype.$emit = function (event) {
      var vm = this;
      if (process.env.NODE_ENV !== 'production') {
        var lowerCaseEvent = event.toLowerCase();
        if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
          tip(
            "Event \"" + lowerCaseEvent + "\" is emitted in component " +
            (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
            "Note that HTML attributes are case-insensitive and you cannot use " +
            "v-on to listen to camelCase events when using in-DOM templates. " +
            "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
          );
        }
      }
      var cbs = vm._events[event];
      if (cbs) {
        cbs = cbs.length > 1 ? toArray(cbs) : cbs;
        var args = toArray(arguments, 1);
        for (var i = 0, l = cbs.length; i < l; i++) {
          try {
            cbs[i].apply(vm, args);
          } catch (e) {
            handleError(e, vm, ("event handler for \"" + event + "\""));
          }
        }
      }
      return vm
    };
  }
  
  /*  */
  
  /**
   * Runtime helper for resolving raw children VNodes into a slot object.
   */
  function resolveSlots (
    children,
    context
  ) {
    var slots = {};
    if (!children) {
      return slots
    }
    for (var i = 0, l = children.length; i < l; i++) {
      var child = children[i];
      var data = child.data;
      // remove slot attribute if the node is resolved as a Vue slot node
      if (data && data.attrs && data.attrs.slot) {
        delete data.attrs.slot;
      }
      // named slots should only be respected if the vnode was rendered in the
      // same context.
      if ((child.context === context || child.functionalContext === context) &&
        data && data.slot != null
      ) {
        var name = child.data.slot;
        var slot = (slots[name] || (slots[name] = []));
        if (child.tag === 'template') {
          slot.push.apply(slot, child.children);
        } else {
          slot.push(child);
        }
      } else {
        (slots.default || (slots.default = [])).push(child);
      }
    }
    // ignore slots that contains only whitespace
    for (var name$1 in slots) {
      if (slots[name$1].every(isWhitespace)) {
        delete slots[name$1];
      }
    }
    return slots
  }
  
  function isWhitespace (node) {
    return node.isComment || node.text === ' '
  }
  
  function resolveScopedSlots (
    fns, // see flow/vnode
    res
  ) {
    res = res || {};
    for (var i = 0; i < fns.length; i++) {
      if (Array.isArray(fns[i])) {
        resolveScopedSlots(fns[i], res);
      } else {
        res[fns[i].key] = fns[i].fn;
      }
    }
    return res
  }
  
  /*  */
  
  var activeInstance = null;
  var isUpdatingChildComponent = false;
  
  function initLifecycle (vm) {
    var options = vm.$options;
  
    // locate first non-abstract parent
    var parent = options.parent;
    if (parent && !options.abstract) {
      while (parent.$options.abstract && parent.$parent) {
        parent = parent.$parent;
      }
      parent.$children.push(vm);
    }
  
    vm.$parent = parent;
    vm.$root = parent ? parent.$root : vm;
  
    vm.$children = [];
    vm.$refs = {};
  
    vm._watcher = null;
    vm._inactive = null;
    vm._directInactive = false;
    vm._isMounted = false;
    vm._isDestroyed = false;
    vm._isBeingDestroyed = false;
  }
  
  function lifecycleMixin (Vue) {
    Vue.prototype._update = function (vnode, hydrating) {
      var vm = this;
      if (vm._isMounted) {
        callHook(vm, 'beforeUpdate');
      }
      var prevEl = vm.$el;
      var prevVnode = vm._vnode;
      var prevActiveInstance = activeInstance;
      activeInstance = vm;
      vm._vnode = vnode;
      // Vue.prototype.__patch__ is injected in entry points
      // based on the rendering backend used.
      if (!prevVnode) {
        // initial render
        vm.$el = vm.__patch__(
          vm.$el, vnode, hydrating, false /* removeOnly */,
          vm.$options._parentElm,
          vm.$options._refElm
        );
        // no need for the ref nodes after initial patch
        // this prevents keeping a detached DOM tree in memory (#5851)
        vm.$options._parentElm = vm.$options._refElm = null;
      } else {
        // updates
        vm.$el = vm.__patch__(prevVnode, vnode);
      }
      activeInstance = prevActiveInstance;
      // update __vue__ reference
      if (prevEl) {
        prevEl.__vue__ = null;
      }
      if (vm.$el) {
        vm.$el.__vue__ = vm;
      }
      // if parent is an HOC, update its $el as well
      if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
        vm.$parent.$el = vm.$el;
      }
      // updated hook is called by the scheduler to ensure that children are
      // updated in a parent's updated hook.
    };
  
    Vue.prototype.$forceUpdate = function () {
      var vm = this;
      if (vm._watcher) {
        vm._watcher.update();
      }
    };
  
    Vue.prototype.$destroy = function () {
      var vm = this;
      if (vm._isBeingDestroyed) {
        return
      }
      callHook(vm, 'beforeDestroy');
      vm._isBeingDestroyed = true;
      // remove self from parent
      var parent = vm.$parent;
      if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
        remove(parent.$children, vm);
      }
      // teardown watchers
      if (vm._watcher) {
        vm._watcher.teardown();
      }
      var i = vm._watchers.length;
      while (i--) {
        vm._watchers[i].teardown();
      }
      // remove reference from data ob
      // frozen object may not have observer.
      if (vm._data.__ob__) {
        vm._data.__ob__.vmCount--;
      }
      // call the last hook...
      vm._isDestroyed = true;
      // invoke destroy hooks on current rendered tree
      vm.__patch__(vm._vnode, null);
      // fire destroyed hook
      callHook(vm, 'destroyed');
      // turn off all instance listeners.
      vm.$off();
      // remove __vue__ reference
      if (vm.$el) {
        vm.$el.__vue__ = null;
      }
      // release circular reference (#6759)
      if (vm.$vnode) {
        vm.$vnode.parent = null;
      }
    };
  }
  
  function mountComponent (
    vm,
    el,
    hydrating
  ) {
    vm.$el = el;
    if (!vm.$options.render) {
      vm.$options.render = createEmptyVNode;
      if (process.env.NODE_ENV !== 'production') {
        /* istanbul ignore if */
        if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
          vm.$options.el || el) {
          warn(
            'You are using the runtime-only build of Vue where the template ' +
            'compiler is not available. Either pre-compile the templates into ' +
            'render functions, or use the compiler-included build.',
            vm
          );
        } else {
          warn(
            'Failed to mount component: template or render function not defined.',
            vm
          );
        }
      }
    }
    callHook(vm, 'beforeMount');
  
    var updateComponent;
    /* istanbul ignore if */
    if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
      updateComponent = function () {
        var name = vm._name;
        var id = vm._uid;
        var startTag = "vue-perf-start:" + id;
        var endTag = "vue-perf-end:" + id;
  
        mark(startTag);
        var vnode = vm._render();
        mark(endTag);
        measure(("vue " + name + " render"), startTag, endTag);
  
        mark(startTag);
        vm._update(vnode, hydrating);
        mark(endTag);
        measure(("vue " + name + " patch"), startTag, endTag);
      };
    } else {
      updateComponent = function () {
        vm._update(vm._render(), hydrating);
      };
    }
  
    vm._watcher = new Watcher(vm, updateComponent, noop);
    hydrating = false;
  
    // manually mounted instance, call mounted on self
    // mounted is called for render-created child components in its inserted hook
    if (vm.$vnode == null) {
      vm._isMounted = true;
      callHook(vm, 'mounted');
    }
    return vm
  }
  
  function updateChildComponent (
    vm,
    propsData,
    listeners,
    parentVnode,
    renderChildren
  ) {
    if (process.env.NODE_ENV !== 'production') {
      isUpdatingChildComponent = true;
    }
  
    // determine whether component has slot children
    // we need to do this before overwriting $options._renderChildren
    var hasChildren = !!(
      renderChildren ||               // has new static slots
      vm.$options._renderChildren ||  // has old static slots
      parentVnode.data.scopedSlots || // has new scoped slots
      vm.$scopedSlots !== emptyObject // has old scoped slots
    );
  
    vm.$options._parentVnode = parentVnode;
    vm.$vnode = parentVnode; // update vm's placeholder node without re-render
  
    if (vm._vnode) { // update child tree's parent
      vm._vnode.parent = parentVnode;
    }
    vm.$options._renderChildren = renderChildren;
  
    // update $attrs and $listeners hash
    // these are also reactive so they may trigger child update if the child
    // used them during render
    vm.$attrs = (parentVnode.data && parentVnode.data.attrs) || emptyObject;
    vm.$listeners = listeners || emptyObject;
  
    // update props
    if (propsData && vm.$options.props) {
      observerState.shouldConvert = false;
      var props = vm._props;
      var propKeys = vm.$options._propKeys || [];
      for (var i = 0; i < propKeys.length; i++) {
        var key = propKeys[i];
        props[key] = validateProp(key, vm.$options.props, propsData, vm);
      }
      observerState.shouldConvert = true;
      // keep a copy of raw propsData
      vm.$options.propsData = propsData;
    }
  
    // update listeners
    if (listeners) {
      var oldListeners = vm.$options._parentListeners;
      vm.$options._parentListeners = listeners;
      updateComponentListeners(vm, listeners, oldListeners);
    }
    // resolve slots + force update if has children
    if (hasChildren) {
      vm.$slots = resolveSlots(renderChildren, parentVnode.context);
      vm.$forceUpdate();
    }
  
    if (process.env.NODE_ENV !== 'production') {
      isUpdatingChildComponent = false;
    }
  }
  
  function isInInactiveTree (vm) {
    while (vm && (vm = vm.$parent)) {
      if (vm._inactive) { return true }
    }
    return false
  }
  
  function activateChildComponent (vm, direct) {
    if (direct) {
      vm._directInactive = false;
      if (isInInactiveTree(vm)) {
        return
      }
    } else if (vm._directInactive) {
      return
    }
    if (vm._inactive || vm._inactive === null) {
      vm._inactive = false;
      for (var i = 0; i < vm.$children.length; i++) {
        activateChildComponent(vm.$children[i]);
      }
      callHook(vm, 'activated');
    }
  }
  
  function deactivateChildComponent (vm, direct) {
    if (direct) {
      vm._directInactive = true;
      if (isInInactiveTree(vm)) {
        return
      }
    }
    if (!vm._inactive) {
      vm._inactive = true;
      for (var i = 0; i < vm.$children.length; i++) {
        deactivateChildComponent(vm.$children[i]);
      }
      callHook(vm, 'deactivated');
    }
  }
  
  function callHook (vm, hook) {
    var handlers = vm.$options[hook];
    if (handlers) {
      for (var i = 0, j = handlers.length; i < j; i++) {
        try {
          handlers[i].call(vm);
        } catch (e) {
          handleError(e, vm, (hook + " hook"));
        }
      }
    }
    if (vm._hasHookEvent) {
      vm.$emit('hook:' + hook);
    }
  }
  
  /*  */
  
  
  var MAX_UPDATE_COUNT = 100;
  
  var queue = [];
  var activatedChildren = [];
  var has = {};
  var circular = {};
  var waiting = false;
  var flushing = false;
  var index = 0;
  
  /**
   * Reset the scheduler's state.
   */
  function resetSchedulerState () {
    index = queue.length = activatedChildren.length = 0;
    has = {};
    if (process.env.NODE_ENV !== 'production') {
      circular = {};
    }
    waiting = flushing = false;
  }
  
  /**
   * Flush both queues and run the watchers.
   */
  function flushSchedulerQueue () {
    flushing = true;
    var watcher, id;
  
    // Sort queue before flush.
    // This ensures that:
    // 1. Components are updated from parent to child. (because parent is always
    //    created before the child)
    // 2. A component's user watchers are run before its render watcher (because
    //    user watchers are created before the render watcher)
    // 3. If a component is destroyed during a parent component's watcher run,
    //    its watchers can be skipped.
    queue.sort(function (a, b) { return a.id - b.id; });
  
    // do not cache length because more watchers might be pushed
    // as we run existing watchers
    for (index = 0; index < queue.length; index++) {
      watcher = queue[index];
      id = watcher.id;
      has[id] = null;
      watcher.run();
      // in dev build, check and stop circular updates.
      if (process.env.NODE_ENV !== 'production' && has[id] != null) {
        circular[id] = (circular[id] || 0) + 1;
        if (circular[id] > MAX_UPDATE_COUNT) {
          warn(
            'You may have an infinite update loop ' + (
              watcher.user
                ? ("in watcher with expression \"" + (watcher.expression) + "\"")
                : "in a component render function."
            ),
            watcher.vm
          );
          break
        }
      }
    }
  
    // keep copies of post queues before resetting state
    var activatedQueue = activatedChildren.slice();
    var updatedQueue = queue.slice();
  
    resetSchedulerState();
  
    // call component updated and activated hooks
    callActivatedHooks(activatedQueue);
    callUpdatedHooks(updatedQueue);
  
    // devtool hook
    /* istanbul ignore if */
    if (devtools && config.devtools) {
      devtools.emit('flush');
    }
  }
  
  function callUpdatedHooks (queue) {
    var i = queue.length;
    while (i--) {
      var watcher = queue[i];
      var vm = watcher.vm;
      if (vm._watcher === watcher && vm._isMounted) {
        callHook(vm, 'updated');
      }
    }
  }
  
  /**
   * Queue a kept-alive component that was activated during patch.
   * The queue will be processed after the entire tree has been patched.
   */
  function queueActivatedComponent (vm) {
    // setting _inactive to false here so that a render function can
    // rely on checking whether it's in an inactive tree (e.g. router-view)
    vm._inactive = false;
    activatedChildren.push(vm);
  }
  
  function callActivatedHooks (queue) {
    for (var i = 0; i < queue.length; i++) {
      queue[i]._inactive = true;
      activateChildComponent(queue[i], true /* true */);
    }
  }
  
  /**
   * Push a watcher into the watcher queue.
   * Jobs with duplicate IDs will be skipped unless it's
   * pushed when the queue is being flushed.
   */
  function queueWatcher (watcher) {
    var id = watcher.id;
    if (has[id] == null) {
      has[id] = true;
      if (!flushing) {
        queue.push(watcher);
      } else {
        // if already flushing, splice the watcher based on its id
        // if already past its id, it will be run next immediately.
        var i = queue.length - 1;
        while (i > index && queue[i].id > watcher.id) {
          i--;
        }
        queue.splice(i + 1, 0, watcher);
      }
      // queue the flush
      if (!waiting) {
        waiting = true;
        nextTick(flushSchedulerQueue);
      }
    }
  }
  
  /*  */
  
  var uid$2 = 0;
  
  /**
   * A watcher parses an expression, collects dependencies,
   * and fires callback when the expression value changes.
   * This is used for both the $watch() api and directives.
   */
  var Watcher = function Watcher (
    vm,
    expOrFn,
    cb,
    options
  ) {
    this.vm = vm;
    vm._watchers.push(this);
    // options
    if (options) {
      this.deep = !!options.deep;
      this.user = !!options.user;
      this.lazy = !!options.lazy;
      this.sync = !!options.sync;
    } else {
      this.deep = this.user = this.lazy = this.sync = false;
    }
    this.cb = cb;
    this.id = ++uid$2; // uid for batching
    this.active = true;
    this.dirty = this.lazy; // for lazy watchers
    this.deps = [];
    this.newDeps = [];
    this.depIds = new _Set();
    this.newDepIds = new _Set();
    this.expression = process.env.NODE_ENV !== 'production'
      ? expOrFn.toString()
      : '';
    // parse expression for getter
    if (typeof expOrFn === 'function') {
      this.getter = expOrFn;
    } else {
      this.getter = parsePath(expOrFn);
      if (!this.getter) {
        this.getter = function () {};
        process.env.NODE_ENV !== 'production' && warn(
          "Failed watching path: \"" + expOrFn + "\" " +
          'Watcher only accepts simple dot-delimited paths. ' +
          'For full control, use a function instead.',
          vm
        );
      }
    }
    this.value = this.lazy
      ? undefined
      : this.get();
  };
  
  /**
   * Evaluate the getter, and re-collect dependencies.
   */
  Watcher.prototype.get = function get () {
    pushTarget(this);
    var value;
    var vm = this.vm;
    try {
      value = this.getter.call(vm, vm);
    } catch (e) {
      if (this.user) {
        handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
      } else {
        throw e
      }
    } finally {
      // "touch" every property so they are all tracked as
      // dependencies for deep watching
      if (this.deep) {
        traverse(value);
      }
      popTarget();
      this.cleanupDeps();
    }
    return value
  };
  
  /**
   * Add a dependency to this directive.
   */
  Watcher.prototype.addDep = function addDep (dep) {
    var id = dep.id;
    if (!this.newDepIds.has(id)) {
      this.newDepIds.add(id);
      this.newDeps.push(dep);
      if (!this.depIds.has(id)) {
        dep.addSub(this);
      }
    }
  };
  
  /**
   * Clean up for dependency collection.
   */
  Watcher.prototype.cleanupDeps = function cleanupDeps () {
      var this$1 = this;
  
    var i = this.deps.length;
    while (i--) {
      var dep = this$1.deps[i];
      if (!this$1.newDepIds.has(dep.id)) {
        dep.removeSub(this$1);
      }
    }
    var tmp = this.depIds;
    this.depIds = this.newDepIds;
    this.newDepIds = tmp;
    this.newDepIds.clear();
    tmp = this.deps;
    this.deps = this.newDeps;
    this.newDeps = tmp;
    this.newDeps.length = 0;
  };
  
  /**
   * Subscriber interface.
   * Will be called when a dependency changes.
   */
  Watcher.prototype.update = function update () {
    /* istanbul ignore else */
    if (this.lazy) {
      this.dirty = true;
    } else if (this.sync) {
      this.run();
    } else {
      queueWatcher(this);
    }
  };
  
  /**
   * Scheduler job interface.
   * Will be called by the scheduler.
   */
  Watcher.prototype.run = function run () {
    if (this.active) {
      var value = this.get();
      if (
        value !== this.value ||
        // Deep watchers and watchers on Object/Arrays should fire even
        // when the value is the same, because the value may
        // have mutated.
        isObject(value) ||
        this.deep
      ) {
        // set new value
        var oldValue = this.value;
        this.value = value;
        if (this.user) {
          try {
            this.cb.call(this.vm, value, oldValue);
          } catch (e) {
            handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
          }
        } else {
          this.cb.call(this.vm, value, oldValue);
        }
      }
    }
  };
  
  /**
   * Evaluate the value of the watcher.
   * This only gets called for lazy watchers.
   */
  Watcher.prototype.evaluate = function evaluate () {
    this.value = this.get();
    this.dirty = false;
  };
  
  /**
   * Depend on all deps collected by this watcher.
   */
  Watcher.prototype.depend = function depend () {
      var this$1 = this;
  
    var i = this.deps.length;
    while (i--) {
      this$1.deps[i].depend();
    }
  };
  
  /**
   * Remove self from all dependencies' subscriber list.
   */
  Watcher.prototype.teardown = function teardown () {
      var this$1 = this;
  
    if (this.active) {
      // remove self from vm's watcher list
      // this is a somewhat expensive operation so we skip it
      // if the vm is being destroyed.
      if (!this.vm._isBeingDestroyed) {
        remove(this.vm._watchers, this);
      }
      var i = this.deps.length;
      while (i--) {
        this$1.deps[i].removeSub(this$1);
      }
      this.active = false;
    }
  };
  
  /**
   * Recursively traverse an object to evoke all converted
   * getters, so that every nested property inside the object
   * is collected as a "deep" dependency.
   */
  var seenObjects = new _Set();
  function traverse (val) {
    seenObjects.clear();
    _traverse(val, seenObjects);
  }
  
  function _traverse (val, seen) {
    var i, keys;
    var isA = Array.isArray(val);
    if ((!isA && !isObject(val)) || !Object.isExtensible(val)) {
      return
    }
    if (val.__ob__) {
      var depId = val.__ob__.dep.id;
      if (seen.has(depId)) {
        return
      }
      seen.add(depId);
    }
    if (isA) {
      i = val.length;
      while (i--) { _traverse(val[i], seen); }
    } else {
      keys = Object.keys(val);
      i = keys.length;
      while (i--) { _traverse(val[keys[i]], seen); }
    }
  }
  
  /*  */
  
  var sharedPropertyDefinition = {
    enumerable: true,
    configurable: true,
    get: noop,
    set: noop
  };
  
  function proxy (target, sourceKey, key) {
    sharedPropertyDefinition.get = function proxyGetter () {
      return this[sourceKey][key]
    };
    sharedPropertyDefinition.set = function proxySetter (val) {
      this[sourceKey][key] = val;
    };
    Object.defineProperty(target, key, sharedPropertyDefinition);
  }
  
  function initState (vm) {
    vm._watchers = [];
    var opts = vm.$options;
    if (opts.props) { initProps(vm, opts.props); }
    if (opts.methods) { initMethods(vm, opts.methods); }
    if (opts.data) {
      initData(vm);
    } else {
      observe(vm._data = {}, true /* asRootData */);
    }
    if (opts.computed) { initComputed(vm, opts.computed); }
    if (opts.watch && opts.watch !== nativeWatch) {
      initWatch(vm, opts.watch);
    }
  }
  
  function initProps (vm, propsOptions) {
    var propsData = vm.$options.propsData || {};
    var props = vm._props = {};
    // cache prop keys so that future props updates can iterate using Array
    // instead of dynamic object key enumeration.
    var keys = vm.$options._propKeys = [];
    var isRoot = !vm.$parent;
    // root instance props should be converted
    observerState.shouldConvert = isRoot;
    var loop = function ( key ) {
      keys.push(key);
      var value = validateProp(key, propsOptions, propsData, vm);
      /* istanbul ignore else */
      if (process.env.NODE_ENV !== 'production') {
        var hyphenatedKey = hyphenate(key);
        if (isReservedAttribute(hyphenatedKey) ||
            config.isReservedAttr(hyphenatedKey)) {
          warn(
            ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
            vm
          );
        }
        defineReactive(props, key, value, function () {
          if (vm.$parent && !isUpdatingChildComponent) {
            warn(
              "Avoid mutating a prop directly since the value will be " +
              "overwritten whenever the parent component re-renders. " +
              "Instead, use a data or computed property based on the prop's " +
              "value. Prop being mutated: \"" + key + "\"",
              vm
            );
          }
        });
      } else {
        defineReactive(props, key, value);
      }
      // static props are already proxied on the component's prototype
      // during Vue.extend(). We only need to proxy props defined at
      // instantiation here.
      if (!(key in vm)) {
        proxy(vm, "_props", key);
      }
    };
  
    for (var key in propsOptions) loop( key );
    observerState.shouldConvert = true;
  }
  
  function initData (vm) {
    var data = vm.$options.data;
    data = vm._data = typeof data === 'function'
      ? getData(data, vm)
      : data || {};
    if (!isPlainObject(data)) {
      data = {};
      process.env.NODE_ENV !== 'production' && warn(
        'data functions should return an object:\n' +
        'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
        vm
      );
    }
    // proxy data on instance
    var keys = Object.keys(data);
    var props = vm.$options.props;
    var methods = vm.$options.methods;
    var i = keys.length;
    while (i--) {
      var key = keys[i];
      if (process.env.NODE_ENV !== 'production') {
        if (methods && hasOwn(methods, key)) {
          warn(
            ("Method \"" + key + "\" has already been defined as a data property."),
            vm
          );
        }
      }
      if (props && hasOwn(props, key)) {
        process.env.NODE_ENV !== 'production' && warn(
          "The data property \"" + key + "\" is already declared as a prop. " +
          "Use prop default value instead.",
          vm
        );
      } else if (!isReserved(key)) {
        proxy(vm, "_data", key);
      }
    }
    // observe data
    observe(data, true /* asRootData */);
  }
  
  function getData (data, vm) {
    try {
      return data.call(vm, vm)
    } catch (e) {
      handleError(e, vm, "data()");
      return {}
    }
  }
  
  var computedWatcherOptions = { lazy: true };
  
  function initComputed (vm, computed) {
    var watchers = vm._computedWatchers = Object.create(null);
    // computed properties are just getters during SSR
    var isSSR = isServerRendering();
  
    for (var key in computed) {
      var userDef = computed[key];
      var getter = typeof userDef === 'function' ? userDef : userDef.get;
      if (process.env.NODE_ENV !== 'production' && getter == null) {
        warn(
          ("Getter is missing for computed property \"" + key + "\"."),
          vm
        );
      }
  
      if (!isSSR) {
        // create internal watcher for the computed property.
        watchers[key] = new Watcher(
          vm,
          getter || noop,
          noop,
          computedWatcherOptions
        );
      }
  
      // component-defined computed properties are already defined on the
      // component prototype. We only need to define computed properties defined
      // at instantiation here.
      if (!(key in vm)) {
        defineComputed(vm, key, userDef);
      } else if (process.env.NODE_ENV !== 'production') {
        if (key in vm.$data) {
          warn(("The computed property \"" + key + "\" is already defined in data."), vm);
        } else if (vm.$options.props && key in vm.$options.props) {
          warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
        }
      }
    }
  }
  
  function defineComputed (
    target,
    key,
    userDef
  ) {
    var shouldCache = !isServerRendering();
    if (typeof userDef === 'function') {
      sharedPropertyDefinition.get = shouldCache
        ? createComputedGetter(key)
        : userDef;
      sharedPropertyDefinition.set = noop;
    } else {
      sharedPropertyDefinition.get = userDef.get
        ? shouldCache && userDef.cache !== false
          ? createComputedGetter(key)
          : userDef.get
        : noop;
      sharedPropertyDefinition.set = userDef.set
        ? userDef.set
        : noop;
    }
    if (process.env.NODE_ENV !== 'production' &&
        sharedPropertyDefinition.set === noop) {
      sharedPropertyDefinition.set = function () {
        warn(
          ("Computed property \"" + key + "\" was assigned to but it has no setter."),
          this
        );
      };
    }
    Object.defineProperty(target, key, sharedPropertyDefinition);
  }
  
  function createComputedGetter (key) {
    return function computedGetter () {
      var watcher = this._computedWatchers && this._computedWatchers[key];
      if (watcher) {
        if (watcher.dirty) {
          watcher.evaluate();
        }
        if (Dep.target) {
          watcher.depend();
        }
        return watcher.value
      }
    }
  }
  
  function initMethods (vm, methods) {
    var props = vm.$options.props;
    for (var key in methods) {
      if (process.env.NODE_ENV !== 'production') {
        if (methods[key] == null) {
          warn(
            "Method \"" + key + "\" has an undefined value in the component definition. " +
            "Did you reference the function correctly?",
            vm
          );
        }
        if (props && hasOwn(props, key)) {
          warn(
            ("Method \"" + key + "\" has already been defined as a prop."),
            vm
          );
        }
        if ((key in vm) && isReserved(key)) {
          warn(
            "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
            "Avoid defining component methods that start with _ or $."
          );
        }
      }
      vm[key] = methods[key] == null ? noop : bind(methods[key], vm);
    }
  }
  
  function initWatch (vm, watch) {
    for (var key in watch) {
      var handler = watch[key];
      if (Array.isArray(handler)) {
        for (var i = 0; i < handler.length; i++) {
          createWatcher(vm, key, handler[i]);
        }
      } else {
        createWatcher(vm, key, handler);
      }
    }
  }
  
  function createWatcher (
    vm,
    keyOrFn,
    handler,
    options
  ) {
    if (isPlainObject(handler)) {
      options = handler;
      handler = handler.handler;
    }
    if (typeof handler === 'string') {
      handler = vm[handler];
    }
    return vm.$watch(keyOrFn, handler, options)
  }
  
  function stateMixin (Vue) {
    // flow somehow has problems with directly declared definition object
    // when using Object.defineProperty, so we have to procedurally build up
    // the object here.
    var dataDef = {};
    dataDef.get = function () { return this._data };
    var propsDef = {};
    propsDef.get = function () { return this._props };
    if (process.env.NODE_ENV !== 'production') {
      dataDef.set = function (newData) {
        warn(
          'Avoid replacing instance root $data. ' +
          'Use nested data properties instead.',
          this
        );
      };
      propsDef.set = function () {
        warn("$props is readonly.", this);
      };
    }
    Object.defineProperty(Vue.prototype, '$data', dataDef);
    Object.defineProperty(Vue.prototype, '$props', propsDef);
  
    Vue.prototype.$set = set;
    Vue.prototype.$delete = del;
  
    Vue.prototype.$watch = function (
      expOrFn,
      cb,
      options
    ) {
      var vm = this;
      if (isPlainObject(cb)) {
        return createWatcher(vm, expOrFn, cb, options)
      }
      options = options || {};
      options.user = true;
      var watcher = new Watcher(vm, expOrFn, cb, options);
      if (options.immediate) {
        cb.call(vm, watcher.value);
      }
      return function unwatchFn () {
        watcher.teardown();
      }
    };
  }
  
  /*  */
  
  function initProvide (vm) {
    var provide = vm.$options.provide;
    if (provide) {
      vm._provided = typeof provide === 'function'
        ? provide.call(vm)
        : provide;
    }
  }
  
  function initInjections (vm) {
    var result = resolveInject(vm.$options.inject, vm);
    if (result) {
      observerState.shouldConvert = false;
      Object.keys(result).forEach(function (key) {
        /* istanbul ignore else */
        if (process.env.NODE_ENV !== 'production') {
          defineReactive(vm, key, result[key], function () {
            warn(
              "Avoid mutating an injected value directly since the changes will be " +
              "overwritten whenever the provided component re-renders. " +
              "injection being mutated: \"" + key + "\"",
              vm
            );
          });
        } else {
          defineReactive(vm, key, result[key]);
        }
      });
      observerState.shouldConvert = true;
    }
  }
  
  function resolveInject (inject, vm) {
    if (inject) {
      // inject is :any because flow is not smart enough to figure out cached
      var result = Object.create(null);
      var keys = hasSymbol
          ? Reflect.ownKeys(inject).filter(function (key) {
            /* istanbul ignore next */
            return Object.getOwnPropertyDescriptor(inject, key).enumerable
          })
          : Object.keys(inject);
  
      for (var i = 0; i < keys.length; i++) {
        var key = keys[i];
        var provideKey = inject[key].from;
        var source = vm;
        while (source) {
          if (source._provided && provideKey in source._provided) {
            result[key] = source._provided[provideKey];
            break
          }
          source = source.$parent;
        }
        if (!source) {
          if ('default' in inject[key]) {
            var provideDefault = inject[key].default;
            result[key] = typeof provideDefault === 'function'
              ? provideDefault.call(vm)
              : provideDefault;
          } else if (process.env.NODE_ENV !== 'production') {
            warn(("Injection \"" + key + "\" not found"), vm);
          }
        }
      }
      return result
    }
  }
  
  /*  */
  
  /**
   * Runtime helper for rendering v-for lists.
   */
  function renderList (
    val,
    render
  ) {
    var ret, i, l, keys, key;
    if (Array.isArray(val) || typeof val === 'string') {
      ret = new Array(val.length);
      for (i = 0, l = val.length; i < l; i++) {
        ret[i] = render(val[i], i);
      }
    } else if (typeof val === 'number') {
      ret = new Array(val);
      for (i = 0; i < val; i++) {
        ret[i] = render(i + 1, i);
      }
    } else if (isObject(val)) {
      keys = Object.keys(val);
      ret = new Array(keys.length);
      for (i = 0, l = keys.length; i < l; i++) {
        key = keys[i];
        ret[i] = render(val[key], key, i);
      }
    }
    if (isDef(ret)) {
      (ret)._isVList = true;
    }
    return ret
  }
  
  /*  */
  
  /**
   * Runtime helper for rendering <slot>
   */
  function renderSlot (
    name,
    fallback,
    props,
    bindObject
  ) {
    var scopedSlotFn = this.$scopedSlots[name];
    var nodes;
    if (scopedSlotFn) { // scoped slot
      props = props || {};
      if (bindObject) {
        if (process.env.NODE_ENV !== 'production' && !isObject(bindObject)) {
          warn(
            'slot v-bind without argument expects an Object',
            this
          );
        }
        props = extend(extend({}, bindObject), props);
      }
      nodes = scopedSlotFn(props) || fallback;
    } else {
      var slotNodes = this.$slots[name];
      // warn duplicate slot usage
      if (slotNodes) {
        if (process.env.NODE_ENV !== 'production' && slotNodes._rendered) {
          warn(
            "Duplicate presence of slot \"" + name + "\" found in the same render tree " +
            "- this will likely cause render errors.",
            this
          );
        }
        slotNodes._rendered = true;
      }
      nodes = slotNodes || fallback;
    }
  
    var target = props && props.slot;
    if (target) {
      return this.$createElement('template', { slot: target }, nodes)
    } else {
      return nodes
    }
  }
  
  /*  */
  
  /**
   * Runtime helper for resolving filters
   */
  function resolveFilter (id) {
    return resolveAsset(this.$options, 'filters', id, true) || identity
  }
  
  /*  */
  
  /**
   * Runtime helper for checking keyCodes from config.
   * exposed as Vue.prototype._k
   * passing in eventKeyName as last argument separately for backwards compat
   */
  function checkKeyCodes (
    eventKeyCode,
    key,
    builtInAlias,
    eventKeyName
  ) {
    var keyCodes = config.keyCodes[key] || builtInAlias;
    if (keyCodes) {
      if (Array.isArray(keyCodes)) {
        return keyCodes.indexOf(eventKeyCode) === -1
      } else {
        return keyCodes !== eventKeyCode
      }
    } else if (eventKeyName) {
      return hyphenate(eventKeyName) !== key
    }
  }
  
  /*  */
  
  /**
   * Runtime helper for merging v-bind="object" into a VNode's data.
   */
  function bindObjectProps (
    data,
    tag,
    value,
    asProp,
    isSync
  ) {
    if (value) {
      if (!isObject(value)) {
        process.env.NODE_ENV !== 'production' && warn(
          'v-bind without argument expects an Object or Array value',
          this
        );
      } else {
        if (Array.isArray(value)) {
          value = toObject(value);
        }
        var hash;
        var loop = function ( key ) {
          if (
            key === 'class' ||
            key === 'style' ||
            isReservedAttribute(key)
          ) {
            hash = data;
          } else {
            var type = data.attrs && data.attrs.type;
            hash = asProp || config.mustUseProp(tag, type, key)
              ? data.domProps || (data.domProps = {})
              : data.attrs || (data.attrs = {});
          }
          if (!(key in hash)) {
            hash[key] = value[key];
  
            if (isSync) {
              var on = data.on || (data.on = {});
              on[("update:" + key)] = function ($event) {
                value[key] = $event;
              };
            }
          }
        };
  
        for (var key in value) loop( key );
      }
    }
    return data
  }
  
  /*  */
  
  /**
   * Runtime helper for rendering static trees.
   */
  function renderStatic (
    index,
    isInFor
  ) {
    // static trees can be rendered once and cached on the contructor options
    // so every instance shares the same cached trees
    var options = this.$options;
    var cached = options.cached || (options.cached = []);
    var tree = cached[index];
    // if has already-rendered static tree and not inside v-for,
    // we can reuse the same tree by doing a shallow clone.
    if (tree && !isInFor) {
      return Array.isArray(tree)
        ? cloneVNodes(tree)
        : cloneVNode(tree)
    }
    // otherwise, render a fresh tree.
    tree = cached[index] = options.staticRenderFns[index].call(this._renderProxy, null, this);
    markStatic(tree, ("__static__" + index), false);
    return tree
  }
  
  /**
   * Runtime helper for v-once.
   * Effectively it means marking the node as static with a unique key.
   */
  function markOnce (
    tree,
    index,
    key
  ) {
    markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
    return tree
  }
  
  function markStatic (
    tree,
    key,
    isOnce
  ) {
    if (Array.isArray(tree)) {
      for (var i = 0; i < tree.length; i++) {
        if (tree[i] && typeof tree[i] !== 'string') {
          markStaticNode(tree[i], (key + "_" + i), isOnce);
        }
      }
    } else {
      markStaticNode(tree, key, isOnce);
    }
  }
  
  function markStaticNode (node, key, isOnce) {
    node.isStatic = true;
    node.key = key;
    node.isOnce = isOnce;
  }
  
  /*  */
  
  function bindObjectListeners (data, value) {
    if (value) {
      if (!isPlainObject(value)) {
        process.env.NODE_ENV !== 'production' && warn(
          'v-on without argument expects an Object value',
          this
        );
      } else {
        var on = data.on = data.on ? extend({}, data.on) : {};
        for (var key in value) {
          var existing = on[key];
          var ours = value[key];
          on[key] = existing ? [].concat(existing, ours) : ours;
        }
      }
    }
    return data
  }
  
  /*  */
  
  function installRenderHelpers (target) {
    target._o = markOnce;
    target._n = toNumber;
    target._s = toString;
    target._l = renderList;
    target._t = renderSlot;
    target._q = looseEqual;
    target._i = looseIndexOf;
    target._m = renderStatic;
    target._f = resolveFilter;
    target._k = checkKeyCodes;
    target._b = bindObjectProps;
    target._v = createTextVNode;
    target._e = createEmptyVNode;
    target._u = resolveScopedSlots;
    target._g = bindObjectListeners;
  }
  
  /*  */
  
  function FunctionalRenderContext (
    data,
    props,
    children,
    parent,
    Ctor
  ) {
    var options = Ctor.options;
    this.data = data;
    this.props = props;
    this.children = children;
    this.parent = parent;
    this.listeners = data.on || emptyObject;
    this.injections = resolveInject(options.inject, parent);
    this.slots = function () { return resolveSlots(children, parent); };
  
    // ensure the createElement function in functional components
    // gets a unique context - this is necessary for correct named slot check
    var contextVm = Object.create(parent);
    var isCompiled = isTrue(options._compiled);
    var needNormalization = !isCompiled;
  
    // support for compiled functional template
    if (isCompiled) {
      // exposing $options for renderStatic()
      this.$options = options;
      // pre-resolve slots for renderSlot()
      this.$slots = this.slots();
      this.$scopedSlots = data.scopedSlots || emptyObject;
    }
  
    if (options._scopeId) {
      this._c = function (a, b, c, d) {
        var vnode = createElement(contextVm, a, b, c, d, needNormalization);
        if (vnode) {
          vnode.functionalScopeId = options._scopeId;
          vnode.functionalContext = parent;
        }
        return vnode
      };
    } else {
      this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
    }
  }
  
  installRenderHelpers(FunctionalRenderContext.prototype);
  
  function createFunctionalComponent (
    Ctor,
    propsData,
    data,
    contextVm,
    children
  ) {
    var options = Ctor.options;
    var props = {};
    var propOptions = options.props;
    if (isDef(propOptions)) {
      for (var key in propOptions) {
        props[key] = validateProp(key, propOptions, propsData || emptyObject);
      }
    } else {
      if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
      if (isDef(data.props)) { mergeProps(props, data.props); }
    }
  
    var renderContext = new FunctionalRenderContext(
      data,
      props,
      children,
      contextVm,
      Ctor
    );
  
    var vnode = options.render.call(null, renderContext._c, renderContext);
  
    if (vnode instanceof VNode) {
      vnode.functionalContext = contextVm;
      vnode.functionalOptions = options;
      if (data.slot) {
        (vnode.data || (vnode.data = {})).slot = data.slot;
      }
    }
  
    return vnode
  }
  
  function mergeProps (to, from) {
    for (var key in from) {
      to[camelize(key)] = from[key];
    }
  }
  
  /*  */
  
  // hooks to be invoked on component VNodes during patch
  var componentVNodeHooks = {
    init: function init (
      vnode,
      hydrating,
      parentElm,
      refElm
    ) {
      if (!vnode.componentInstance || vnode.componentInstance._isDestroyed) {
        var child = vnode.componentInstance = createComponentInstanceForVnode(
          vnode,
          activeInstance,
          parentElm,
          refElm
        );
        child.$mount(hydrating ? vnode.elm : undefined, hydrating);
      } else if (vnode.data.keepAlive) {
        // kept-alive components, treat as a patch
        var mountedNode = vnode; // work around flow
        componentVNodeHooks.prepatch(mountedNode, mountedNode);
      }
    },
  
    prepatch: function prepatch (oldVnode, vnode) {
      var options = vnode.componentOptions;
      var child = vnode.componentInstance = oldVnode.componentInstance;
      updateChildComponent(
        child,
        options.propsData, // updated props
        options.listeners, // updated listeners
        vnode, // new parent vnode
        options.children // new children
      );
    },
  
    insert: function insert (vnode) {
      var context = vnode.context;
      var componentInstance = vnode.componentInstance;
      if (!componentInstance._isMounted) {
        componentInstance._isMounted = true;
        callHook(componentInstance, 'mounted');
      }
      if (vnode.data.keepAlive) {
        if (context._isMounted) {
          // vue-router#1212
          // During updates, a kept-alive component's child components may
          // change, so directly walking the tree here may call activated hooks
          // on incorrect children. Instead we push them into a queue which will
          // be processed after the whole patch process ended.
          queueActivatedComponent(componentInstance);
        } else {
          activateChildComponent(componentInstance, true /* direct */);
        }
      }
    },
  
    destroy: function destroy (vnode) {
      var componentInstance = vnode.componentInstance;
      if (!componentInstance._isDestroyed) {
        if (!vnode.data.keepAlive) {
          componentInstance.$destroy();
        } else {
          deactivateChildComponent(componentInstance, true /* direct */);
        }
      }
    }
  };
  
  var hooksToMerge = Object.keys(componentVNodeHooks);
  
  function createComponent (
    Ctor,
    data,
    context,
    children,
    tag
  ) {
    if (isUndef(Ctor)) {
      return
    }
  
    var baseCtor = context.$options._base;
  
    // plain options object: turn it into a constructor
    if (isObject(Ctor)) {
      Ctor = baseCtor.extend(Ctor);
    }
  
    // if at this stage it's not a constructor or an async component factory,
    // reject.
    if (typeof Ctor !== 'function') {
      if (process.env.NODE_ENV !== 'production') {
        warn(("Invalid Component definition: " + (String(Ctor))), context);
      }
      return
    }
  
    // async component
    var asyncFactory;
    if (isUndef(Ctor.cid)) {
      asyncFactory = Ctor;
      Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
      if (Ctor === undefined) {
        // return a placeholder node for async component, which is rendered
        // as a comment node but preserves all the raw information for the node.
        // the information will be used for async server-rendering and hydration.
        return createAsyncPlaceholder(
          asyncFactory,
          data,
          context,
          children,
          tag
        )
      }
    }
  
    data = data || {};
  
    // resolve constructor options in case global mixins are applied after
    // component constructor creation
    resolveConstructorOptions(Ctor);
  
    // transform component v-model data into props & events
    if (isDef(data.model)) {
      transformModel(Ctor.options, data);
    }
  
    // extract props
    var propsData = extractPropsFromVNodeData(data, Ctor, tag);
  
    // functional component
    if (isTrue(Ctor.options.functional)) {
      return createFunctionalComponent(Ctor, propsData, data, context, children)
    }
  
    // extract listeners, since these needs to be treated as
    // child component listeners instead of DOM listeners
    var listeners = data.on;
    // replace with listeners with .native modifier
    // so it gets processed during parent component patch.
    data.on = data.nativeOn;
  
    if (isTrue(Ctor.options.abstract)) {
      // abstract components do not keep anything
      // other than props & listeners & slot
  
      // work around flow
      var slot = data.slot;
      data = {};
      if (slot) {
        data.slot = slot;
      }
    }
  
    // merge component management hooks onto the placeholder node
    mergeHooks(data);
  
    // return a placeholder vnode
    var name = Ctor.options.name || tag;
    var vnode = new VNode(
      ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
      data, undefined, undefined, undefined, context,
      { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
      asyncFactory
    );
    return vnode
  }
  
  function createComponentInstanceForVnode (
    vnode, // we know it's MountedComponentVNode but flow doesn't
    parent, // activeInstance in lifecycle state
    parentElm,
    refElm
  ) {
    var vnodeComponentOptions = vnode.componentOptions;
    var options = {
      _isComponent: true,
      parent: parent,
      propsData: vnodeComponentOptions.propsData,
      _componentTag: vnodeComponentOptions.tag,
      _parentVnode: vnode,
      _parentListeners: vnodeComponentOptions.listeners,
      _renderChildren: vnodeComponentOptions.children,
      _parentElm: parentElm || null,
      _refElm: refElm || null
    };
    // check inline-template render functions
    var inlineTemplate = vnode.data.inlineTemplate;
    if (isDef(inlineTemplate)) {
      options.render = inlineTemplate.render;
      options.staticRenderFns = inlineTemplate.staticRenderFns;
    }
    return new vnodeComponentOptions.Ctor(options)
  }
  
  function mergeHooks (data) {
    if (!data.hook) {
      data.hook = {};
    }
    for (var i = 0; i < hooksToMerge.length; i++) {
      var key = hooksToMerge[i];
      var fromParent = data.hook[key];
      var ours = componentVNodeHooks[key];
      data.hook[key] = fromParent ? mergeHook$1(ours, fromParent) : ours;
    }
  }
  
  function mergeHook$1 (one, two) {
    return function (a, b, c, d) {
      one(a, b, c, d);
      two(a, b, c, d);
    }
  }
  
  // transform component v-model info (value and callback) into
  // prop and event handler respectively.
  function transformModel (options, data) {
    var prop = (options.model && options.model.prop) || 'value';
    var event = (options.model && options.model.event) || 'input';(data.props || (data.props = {}))[prop] = data.model.value;
    var on = data.on || (data.on = {});
    if (isDef(on[event])) {
      on[event] = [data.model.callback].concat(on[event]);
    } else {
      on[event] = data.model.callback;
    }
  }
  
  /*  */
  
  var SIMPLE_NORMALIZE = 1;
  var ALWAYS_NORMALIZE = 2;
  
  // wrapper function for providing a more flexible interface
  // without getting yelled at by flow
  function createElement (
    context,
    tag,
    data,
    children,
    normalizationType,
    alwaysNormalize
  ) {
    if (Array.isArray(data) || isPrimitive(data)) {
      normalizationType = children;
      children = data;
      data = undefined;
    }
    if (isTrue(alwaysNormalize)) {
      normalizationType = ALWAYS_NORMALIZE;
    }
    return _createElement(context, tag, data, children, normalizationType)
  }
  
  function _createElement (
    context,
    tag,
    data,
    children,
    normalizationType
  ) {
    if (isDef(data) && isDef((data).__ob__)) {
      process.env.NODE_ENV !== 'production' && warn(
        "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
        'Always create fresh vnode data objects in each render!',
        context
      );
      return createEmptyVNode()
    }
    // object syntax in v-bind
    if (isDef(data) && isDef(data.is)) {
      tag = data.is;
    }
    if (!tag) {
      // in case of component :is set to falsy value
      return createEmptyVNode()
    }
    // warn against non-primitive key
    if (process.env.NODE_ENV !== 'production' &&
      isDef(data) && isDef(data.key) && !isPrimitive(data.key)
    ) {
      warn(
        'Avoid using non-primitive value as key, ' +
        'use string/number value instead.',
        context
      );
    }
    // support single function children as default scoped slot
    if (Array.isArray(children) &&
      typeof children[0] === 'function'
    ) {
      data = data || {};
      data.scopedSlots = { default: children[0] };
      children.length = 0;
    }
    if (normalizationType === ALWAYS_NORMALIZE) {
      children = normalizeChildren(children);
    } else if (normalizationType === SIMPLE_NORMALIZE) {
      children = simpleNormalizeChildren(children);
    }
    var vnode, ns;
    if (typeof tag === 'string') {
      var Ctor;
      ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
      if (config.isReservedTag(tag)) {
        // platform built-in elements
        vnode = new VNode(
          config.parsePlatformTagName(tag), data, children,
          undefined, undefined, context
        );
      } else if (isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
        // component
        vnode = createComponent(Ctor, data, context, children, tag);
      } else {
        // unknown or unlisted namespaced elements
        // check at runtime because it may get assigned a namespace when its
        // parent normalizes children
        vnode = new VNode(
          tag, data, children,
          undefined, undefined, context
        );
      }
    } else {
      // direct component options / constructor
      vnode = createComponent(tag, data, context, children);
    }
    if (isDef(vnode)) {
      if (ns) { applyNS(vnode, ns); }
      return vnode
    } else {
      return createEmptyVNode()
    }
  }
  
  function applyNS (vnode, ns, force) {
    vnode.ns = ns;
    if (vnode.tag === 'foreignObject') {
      // use default namespace inside foreignObject
      ns = undefined;
      force = true;
    }
    if (isDef(vnode.children)) {
      for (var i = 0, l = vnode.children.length; i < l; i++) {
        var child = vnode.children[i];
        if (isDef(child.tag) && (isUndef(child.ns) || isTrue(force))) {
          applyNS(child, ns, force);
        }
      }
    }
  }
  
  /*  */
  
  function initRender (vm) {
    vm._vnode = null; // the root of the child tree
    var options = vm.$options;
    var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
    var renderContext = parentVnode && parentVnode.context;
    vm.$slots = resolveSlots(options._renderChildren, renderContext);
    vm.$scopedSlots = emptyObject;
    // bind the createElement fn to this instance
    // so that we get proper render context inside it.
    // args order: tag, data, children, normalizationType, alwaysNormalize
    // internal version is used by render functions compiled from templates
    vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
    // normalization is always applied for the public version, used in
    // user-written render functions.
    vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
  
    // $attrs & $listeners are exposed for easier HOC creation.
    // they need to be reactive so that HOCs using them are always updated
    var parentData = parentVnode && parentVnode.data;
  
    /* istanbul ignore else */
    if (process.env.NODE_ENV !== 'production') {
      defineReactive(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
        !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
      }, true);
      defineReactive(vm, '$listeners', options._parentListeners || emptyObject, function () {
        !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
      }, true);
    } else {
      defineReactive(vm, '$attrs', parentData && parentData.attrs || emptyObject, null, true);
      defineReactive(vm, '$listeners', options._parentListeners || emptyObject, null, true);
    }
  }
  
  function renderMixin (Vue) {
    // install runtime convenience helpers
    installRenderHelpers(Vue.prototype);
  
    Vue.prototype.$nextTick = function (fn) {
      return nextTick(fn, this)
    };
  
    Vue.prototype._render = function () {
      var vm = this;
      var ref = vm.$options;
      var render = ref.render;
      var _parentVnode = ref._parentVnode;
  
      if (vm._isMounted) {
        // if the parent didn't update, the slot nodes will be the ones from
        // last render. They need to be cloned to ensure "freshness" for this render.
        for (var key in vm.$slots) {
          var slot = vm.$slots[key];
          if (slot._rendered) {
            vm.$slots[key] = cloneVNodes(slot, true /* deep */);
          }
        }
      }
  
      vm.$scopedSlots = (_parentVnode && _parentVnode.data.scopedSlots) || emptyObject;
  
      // set parent vnode. this allows render functions to have access
      // to the data on the placeholder node.
      vm.$vnode = _parentVnode;
      // render self
      var vnode;
      try {
        vnode = render.call(vm._renderProxy, vm.$createElement);
      } catch (e) {
        handleError(e, vm, "render");
        // return error render result,
        // or previous vnode to prevent render error causing blank component
        /* istanbul ignore else */
        if (process.env.NODE_ENV !== 'production') {
          if (vm.$options.renderError) {
            try {
              vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
            } catch (e) {
              handleError(e, vm, "renderError");
              vnode = vm._vnode;
            }
          } else {
            vnode = vm._vnode;
          }
        } else {
          vnode = vm._vnode;
        }
      }
      // return empty vnode in case the render function errored out
      if (!(vnode instanceof VNode)) {
        if (process.env.NODE_ENV !== 'production' && Array.isArray(vnode)) {
          warn(
            'Multiple root nodes returned from render function. Render function ' +
            'should return a single root node.',
            vm
          );
        }
        vnode = createEmptyVNode();
      }
      // set parent
      vnode.parent = _parentVnode;
      return vnode
    };
  }
  
  /*  */
  
  var uid$1 = 0;
  
  function initMixin (Vue) {
    Vue.prototype._init = function (options) {
      var vm = this;
      // a uid
      vm._uid = uid$1++;
  
      var startTag, endTag;
      /* istanbul ignore if */
      if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
        startTag = "vue-perf-start:" + (vm._uid);
        endTag = "vue-perf-end:" + (vm._uid);
        mark(startTag);
      }
  
      // a flag to avoid this being observed
      vm._isVue = true;
      // merge options
      if (options && options._isComponent) {
        // optimize internal component instantiation
        // since dynamic options merging is pretty slow, and none of the
        // internal component options needs special treatment.
        initInternalComponent(vm, options);
      } else {
        vm.$options = mergeOptions(
          resolveConstructorOptions(vm.constructor),
          options || {},
          vm
        );
      }
      /* istanbul ignore else */
      if (process.env.NODE_ENV !== 'production') {
        initProxy(vm);
      } else {
        vm._renderProxy = vm;
      }
      // expose real self
      vm._self = vm;
      initLifecycle(vm);
      initEvents(vm);
      initRender(vm);
      callHook(vm, 'beforeCreate');
      initInjections(vm); // resolve injections before data/props
      initState(vm);
      initProvide(vm); // resolve provide after data/props
      callHook(vm, 'created');
  
      /* istanbul ignore if */
      if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
        vm._name = formatComponentName(vm, false);
        mark(endTag);
        measure(("vue " + (vm._name) + " init"), startTag, endTag);
      }
  
      if (vm.$options.el) {
        vm.$mount(vm.$options.el);
      }
    };
  }
  
  function initInternalComponent (vm, options) {
    var opts = vm.$options = Object.create(vm.constructor.options);
    // doing this because it's faster than dynamic enumeration.
    opts.parent = options.parent;
    opts.propsData = options.propsData;
    opts._parentVnode = options._parentVnode;
    opts._parentListeners = options._parentListeners;
    opts._renderChildren = options._renderChildren;
    opts._componentTag = options._componentTag;
    opts._parentElm = options._parentElm;
    opts._refElm = options._refElm;
    if (options.render) {
      opts.render = options.render;
      opts.staticRenderFns = options.staticRenderFns;
    }
  }
  
  function resolveConstructorOptions (Ctor) {
    var options = Ctor.options;
    if (Ctor.super) {
      var superOptions = resolveConstructorOptions(Ctor.super);
      var cachedSuperOptions = Ctor.superOptions;
      if (superOptions !== cachedSuperOptions) {
        // super option changed,
        // need to resolve new options.
        Ctor.superOptions = superOptions;
        // check if there are any late-modified/attached options (#4976)
        var modifiedOptions = resolveModifiedOptions(Ctor);
        // update base extend options
        if (modifiedOptions) {
          extend(Ctor.extendOptions, modifiedOptions);
        }
        options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions);
        if (options.name) {
          options.components[options.name] = Ctor;
        }
      }
    }
    return options
  }
  
  function resolveModifiedOptions (Ctor) {
    var modified;
    var latest = Ctor.options;
    var extended = Ctor.extendOptions;
    var sealed = Ctor.sealedOptions;
    for (var key in latest) {
      if (latest[key] !== sealed[key]) {
        if (!modified) { modified = {}; }
        modified[key] = dedupe(latest[key], extended[key], sealed[key]);
      }
    }
    return modified
  }
  
  function dedupe (latest, extended, sealed) {
    // compare latest and sealed to ensure lifecycle hooks won't be duplicated
    // between merges
    if (Array.isArray(latest)) {
      var res = [];
      sealed = Array.isArray(sealed) ? sealed : [sealed];
      extended = Array.isArray(extended) ? extended : [extended];
      for (var i = 0; i < latest.length; i++) {
        // push original options and not sealed options to exclude duplicated options
        if (extended.indexOf(latest[i]) >= 0 || sealed.indexOf(latest[i]) < 0) {
          res.push(latest[i]);
        }
      }
      return res
    } else {
      return latest
    }
  }
  
  function Vue$3 (options) {
    if (process.env.NODE_ENV !== 'production' &&
      !(this instanceof Vue$3)
    ) {
      warn('Vue is a constructor and should be called with the `new` keyword');
    }
    this._init(options);
  }
  
  initMixin(Vue$3);
  stateMixin(Vue$3);
  eventsMixin(Vue$3);
  lifecycleMixin(Vue$3);
  renderMixin(Vue$3);
  
  /*  */
  
  function initUse (Vue) {
    Vue.use = function (plugin) {
      var installedPlugins = (this._installedPlugins || (this._installedPlugins = []));
      if (installedPlugins.indexOf(plugin) > -1) {
        return this
      }
  
      // additional parameters
      var args = toArray(arguments, 1);
      args.unshift(this);
      if (typeof plugin.install === 'function') {
        plugin.install.apply(plugin, args);
      } else if (typeof plugin === 'function') {
        plugin.apply(null, args);
      }
      installedPlugins.push(plugin);
      return this
    };
  }
  
  /*  */
  
  function initMixin$1 (Vue) {
    Vue.mixin = function (mixin) {
      this.options = mergeOptions(this.options, mixin);
      return this
    };
  }
  
  /*  */
  
  function initExtend (Vue) {
    /**
     * Each instance constructor, including Vue, has a unique
     * cid. This enables us to create wrapped "child
     * constructors" for prototypal inheritance and cache them.
     */
    Vue.cid = 0;
    var cid = 1;
  
    /**
     * Class inheritance
     */
    Vue.extend = function (extendOptions) {
      extendOptions = extendOptions || {};
      var Super = this;
      var SuperId = Super.cid;
      var cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});
      if (cachedCtors[SuperId]) {
        return cachedCtors[SuperId]
      }
  
      var name = extendOptions.name || Super.options.name;
      if (process.env.NODE_ENV !== 'production') {
        if (!/^[a-zA-Z][\w-]*$/.test(name)) {
          warn(
            'Invalid component name: "' + name + '". Component names ' +
            'can only contain alphanumeric characters and the hyphen, ' +
            'and must start with a letter.'
          );
        }
      }
  
      var Sub = function VueComponent (options) {
        this._init(options);
      };
      Sub.prototype = Object.create(Super.prototype);
      Sub.prototype.constructor = Sub;
      Sub.cid = cid++;
      Sub.options = mergeOptions(
        Super.options,
        extendOptions
      );
      Sub['super'] = Super;
  
      // For props and computed properties, we define the proxy getters on
      // the Vue instances at extension time, on the extended prototype. This
      // avoids Object.defineProperty calls for each instance created.
      if (Sub.options.props) {
        initProps$1(Sub);
      }
      if (Sub.options.computed) {
        initComputed$1(Sub);
      }
  
      // allow further extension/mixin/plugin usage
      Sub.extend = Super.extend;
      Sub.mixin = Super.mixin;
      Sub.use = Super.use;
  
      // create asset registers, so extended classes
      // can have their private assets too.
      ASSET_TYPES.forEach(function (type) {
        Sub[type] = Super[type];
      });
      // enable recursive self-lookup
      if (name) {
        Sub.options.components[name] = Sub;
      }
  
      // keep a reference to the super options at extension time.
      // later at instantiation we can check if Super's options have
      // been updated.
      Sub.superOptions = Super.options;
      Sub.extendOptions = extendOptions;
      Sub.sealedOptions = extend({}, Sub.options);
  
      // cache constructor
      cachedCtors[SuperId] = Sub;
      return Sub
    };
  }
  
  function initProps$1 (Comp) {
    var props = Comp.options.props;
    for (var key in props) {
      proxy(Comp.prototype, "_props", key);
    }
  }
  
  function initComputed$1 (Comp) {
    var computed = Comp.options.computed;
    for (var key in computed) {
      defineComputed(Comp.prototype, key, computed[key]);
    }
  }
  
  /*  */
  
  function initAssetRegisters (Vue) {
    /**
     * Create asset registration methods.
     */
    ASSET_TYPES.forEach(function (type) {
      Vue[type] = function (
        id,
        definition
      ) {
        if (!definition) {
          return this.options[type + 's'][id]
        } else {
          /* istanbul ignore if */
          if (process.env.NODE_ENV !== 'production') {
            if (type === 'component' && config.isReservedTag(id)) {
              warn(
                'Do not use built-in or reserved HTML elements as component ' +
                'id: ' + id
              );
            }
          }
          if (type === 'component' && isPlainObject(definition)) {
            definition.name = definition.name || id;
            definition = this.options._base.extend(definition);
          }
          if (type === 'directive' && typeof definition === 'function') {
            definition = { bind: definition, update: definition };
          }
          this.options[type + 's'][id] = definition;
          return definition
        }
      };
    });
  }
  
  /*  */
  
  function getComponentName (opts) {
    return opts && (opts.Ctor.options.name || opts.tag)
  }
  
  function matches (pattern, name) {
    if (Array.isArray(pattern)) {
      return pattern.indexOf(name) > -1
    } else if (typeof pattern === 'string') {
      return pattern.split(',').indexOf(name) > -1
    } else if (isRegExp(pattern)) {
      return pattern.test(name)
    }
    /* istanbul ignore next */
    return false
  }
  
  function pruneCache (keepAliveInstance, filter) {
    var cache = keepAliveInstance.cache;
    var keys = keepAliveInstance.keys;
    var _vnode = keepAliveInstance._vnode;
    for (var key in cache) {
      var cachedNode = cache[key];
      if (cachedNode) {
        var name = getComponentName(cachedNode.componentOptions);
        if (name && !filter(name)) {
          pruneCacheEntry(cache, key, keys, _vnode);
        }
      }
    }
  }
  
  function pruneCacheEntry (
    cache,
    key,
    keys,
    current
  ) {
    var cached$$1 = cache[key];
    if (cached$$1 && cached$$1 !== current) {
      cached$$1.componentInstance.$destroy();
    }
    cache[key] = null;
    remove(keys, key);
  }
  
  var patternTypes = [String, RegExp, Array];
  
  var KeepAlive = {
    name: 'keep-alive',
    abstract: true,
  
    props: {
      include: patternTypes,
      exclude: patternTypes,
      max: [String, Number]
    },
  
    created: function created () {
      this.cache = Object.create(null);
      this.keys = [];
    },
  
    destroyed: function destroyed () {
      var this$1 = this;
  
      for (var key in this$1.cache) {
        pruneCacheEntry(this$1.cache, key, this$1.keys);
      }
    },
  
    watch: {
      include: function include (val) {
        pruneCache(this, function (name) { return matches(val, name); });
      },
      exclude: function exclude (val) {
        pruneCache(this, function (name) { return !matches(val, name); });
      }
    },
  
    render: function render () {
      var vnode = getFirstComponentChild(this.$slots.default);
      var componentOptions = vnode && vnode.componentOptions;
      if (componentOptions) {
        // check pattern
        var name = getComponentName(componentOptions);
        if (name && (
          (this.exclude && matches(this.exclude, name)) ||
          (this.include && !matches(this.include, name))
        )) {
          return vnode
        }
  
        var ref = this;
        var cache = ref.cache;
        var keys = ref.keys;
        var key = vnode.key == null
          // same constructor may get registered as different local components
          // so cid alone is not enough (#3269)
          ? componentOptions.Ctor.cid + (componentOptions.tag ? ("::" + (componentOptions.tag)) : '')
          : vnode.key;
        if (cache[key]) {
          vnode.componentInstance = cache[key].componentInstance;
          // make current key freshest
          remove(keys, key);
          keys.push(key);
        } else {
          cache[key] = vnode;
          keys.push(key);
          // prune oldest entry
          if (this.max && keys.length > parseInt(this.max)) {
            pruneCacheEntry(cache, keys[0], keys, this._vnode);
          }
        }
  
        vnode.data.keepAlive = true;
      }
      return vnode
    }
  };
  
  var builtInComponents = {
    KeepAlive: KeepAlive
  };
  
  /*  */
  
  function initGlobalAPI (Vue) {
    // config
    var configDef = {};
    configDef.get = function () { return config; };
    if (process.env.NODE_ENV !== 'production') {
      configDef.set = function () {
        warn(
          'Do not replace the Vue.config object, set individual fields instead.'
        );
      };
    }
    Object.defineProperty(Vue, 'config', configDef);
  
    // exposed util methods.
    // NOTE: these are not considered part of the public API - avoid relying on
    // them unless you are aware of the risk.
    Vue.util = {
      warn: warn,
      extend: extend,
      mergeOptions: mergeOptions,
      defineReactive: defineReactive
    };
  
    Vue.set = set;
    Vue.delete = del;
    Vue.nextTick = nextTick;
  
    Vue.options = Object.create(null);
    ASSET_TYPES.forEach(function (type) {
      Vue.options[type + 's'] = Object.create(null);
    });
  
    // this is used to identify the "base" constructor to extend all plain-object
    // components with in Weex's multi-instance scenarios.
    Vue.options._base = Vue;
  
    extend(Vue.options.components, builtInComponents);
  
    initUse(Vue);
    initMixin$1(Vue);
    initExtend(Vue);
    initAssetRegisters(Vue);
  }
  
  initGlobalAPI(Vue$3);
  
  Object.defineProperty(Vue$3.prototype, '$isServer', {
    get: isServerRendering
  });
  
  Object.defineProperty(Vue$3.prototype, '$ssrContext', {
    get: function get () {
      /* istanbul ignore next */
      return this.$vnode && this.$vnode.ssrContext
    }
  });
  
  Vue$3.version = '2.5.3';
  
  /*  */
  
  // these are reserved for web because they are directly compiled away
  // during template compilation
  var isReservedAttr = makeMap('style,class');
  
  // attributes that should be using props for binding
  var acceptValue = makeMap('input,textarea,option,select,progress');
  var mustUseProp = function (tag, type, attr) {
    return (
      (attr === 'value' && acceptValue(tag)) && type !== 'button' ||
      (attr === 'selected' && tag === 'option') ||
      (attr === 'checked' && tag === 'input') ||
      (attr === 'muted' && tag === 'video')
    )
  };
  
  var isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck');
  
  var isBooleanAttr = makeMap(
    'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
    'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
    'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
    'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
    'required,reversed,scoped,seamless,selected,sortable,translate,' +
    'truespeed,typemustmatch,visible'
  );
  
  var xlinkNS = 'http://www.w3.org/1999/xlink';
  
  var isXlink = function (name) {
    return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
  };
  
  var getXlinkProp = function (name) {
    return isXlink(name) ? name.slice(6, name.length) : ''
  };
  
  var isFalsyAttrValue = function (val) {
    return val == null || val === false
  };
  
  /*  */
  
  function genClassForVnode (vnode) {
    var data = vnode.data;
    var parentNode = vnode;
    var childNode = vnode;
    while (isDef(childNode.componentInstance)) {
      childNode = childNode.componentInstance._vnode;
      if (childNode.data) {
        data = mergeClassData(childNode.data, data);
      }
    }
    while (isDef(parentNode = parentNode.parent)) {
      if (parentNode.data) {
        data = mergeClassData(data, parentNode.data);
      }
    }
    return renderClass(data.staticClass, data.class)
  }
  
  function mergeClassData (child, parent) {
    return {
      staticClass: concat(child.staticClass, parent.staticClass),
      class: isDef(child.class)
        ? [child.class, parent.class]
        : parent.class
    }
  }
  
  function renderClass (
    staticClass,
    dynamicClass
  ) {
    if (isDef(staticClass) || isDef(dynamicClass)) {
      return concat(staticClass, stringifyClass(dynamicClass))
    }
    /* istanbul ignore next */
    return ''
  }
  
  function concat (a, b) {
    return a ? b ? (a + ' ' + b) : a : (b || '')
  }
  
  function stringifyClass (value) {
    if (Array.isArray(value)) {
      return stringifyArray(value)
    }
    if (isObject(value)) {
      return stringifyObject(value)
    }
    if (typeof value === 'string') {
      return value
    }
    /* istanbul ignore next */
    return ''
  }
  
  function stringifyArray (value) {
    var res = '';
    var stringified;
    for (var i = 0, l = value.length; i < l; i++) {
      if (isDef(stringified = stringifyClass(value[i])) && stringified !== '') {
        if (res) { res += ' '; }
        res += stringified;
      }
    }
    return res
  }
  
  function stringifyObject (value) {
    var res = '';
    for (var key in value) {
      if (value[key]) {
        if (res) { res += ' '; }
        res += key;
      }
    }
    return res
  }
  
  /*  */
  
  var namespaceMap = {
    svg: 'http://www.w3.org/2000/svg',
    math: 'http://www.w3.org/1998/Math/MathML'
  };
  
  var isHTMLTag = makeMap(
    'html,body,base,head,link,meta,style,title,' +
    'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
    'div,dd,dl,dt,figcaption,figure,picture,hr,img,li,main,ol,p,pre,ul,' +
    'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
    's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
    'embed,object,param,source,canvas,script,noscript,del,ins,' +
    'caption,col,colgroup,table,thead,tbody,td,th,tr,' +
    'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +
    'output,progress,select,textarea,' +
    'details,dialog,menu,menuitem,summary,' +
    'content,element,shadow,template,blockquote,iframe,tfoot'
  );
  
  // this map is intentionally selective, only covering SVG elements that may
  // contain child elements.
  var isSVG = makeMap(
    'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font-face,' +
    'foreignObject,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +
    'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',
    true
  );
  
  var isPreTag = function (tag) { return tag === 'pre'; };
  
  var isReservedTag = function (tag) {
    return isHTMLTag(tag) || isSVG(tag)
  };
  
  function getTagNamespace (tag) {
    if (isSVG(tag)) {
      return 'svg'
    }
    // basic support for MathML
    // note it doesn't support other MathML elements being component roots
    if (tag === 'math') {
      return 'math'
    }
  }
  
  var unknownElementCache = Object.create(null);
  function isUnknownElement (tag) {
    /* istanbul ignore if */
    if (!inBrowser) {
      return true
    }
    if (isReservedTag(tag)) {
      return false
    }
    tag = tag.toLowerCase();
    /* istanbul ignore if */
    if (unknownElementCache[tag] != null) {
      return unknownElementCache[tag]
    }
    var el = document.createElement(tag);
    if (tag.indexOf('-') > -1) {
      // http://stackoverflow.com/a/28210364/1070244
      return (unknownElementCache[tag] = (
        el.constructor === window.HTMLUnknownElement ||
        el.constructor === window.HTMLElement
      ))
    } else {
      return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))
    }
  }
  
  var isTextInputType = makeMap('text,number,password,search,email,tel,url');
  
  /*  */
  
  /**
   * Query an element selector if it's not an element already.
   */
  function query (el) {
    if (typeof el === 'string') {
      var selected = document.querySelector(el);
      if (!selected) {
        process.env.NODE_ENV !== 'production' && warn(
          'Cannot find element: ' + el
        );
        return document.createElement('div')
      }
      return selected
    } else {
      return el
    }
  }
  
  /*  */
  
  function createElement$1 (tagName, vnode) {
    var elm = document.createElement(tagName);
    if (tagName !== 'select') {
      return elm
    }
    // false or null will remove the attribute but undefined will not
    if (vnode.data && vnode.data.attrs && vnode.data.attrs.multiple !== undefined) {
      elm.setAttribute('multiple', 'multiple');
    }
    return elm
  }
  
  function createElementNS (namespace, tagName) {
    return document.createElementNS(namespaceMap[namespace], tagName)
  }
  
  function createTextNode (text) {
    return document.createTextNode(text)
  }
  
  function createComment (text) {
    return document.createComment(text)
  }
  
  function insertBefore (parentNode, newNode, referenceNode) {
    parentNode.insertBefore(newNode, referenceNode);
  }
  
  function removeChild (node, child) {
    node.removeChild(child);
  }
  
  function appendChild (node, child) {
    node.appendChild(child);
  }
  
  function parentNode (node) {
    return node.parentNode
  }
  
  function nextSibling (node) {
    return node.nextSibling
  }
  
  function tagName (node) {
    return node.tagName
  }
  
  function setTextContent (node, text) {
    node.textContent = text;
  }
  
  function setAttribute (node, key, val) {
    node.setAttribute(key, val);
  }
  
  
  var nodeOps = Object.freeze({
  	createElement: createElement$1,
  	createElementNS: createElementNS,
  	createTextNode: createTextNode,
  	createComment: createComment,
  	insertBefore: insertBefore,
  	removeChild: removeChild,
  	appendChild: appendChild,
  	parentNode: parentNode,
  	nextSibling: nextSibling,
  	tagName: tagName,
  	setTextContent: setTextContent,
  	setAttribute: setAttribute
  });
  
  /*  */
  
  var ref = {
    create: function create (_, vnode) {
      registerRef(vnode);
    },
    update: function update (oldVnode, vnode) {
      if (oldVnode.data.ref !== vnode.data.ref) {
        registerRef(oldVnode, true);
        registerRef(vnode);
      }
    },
    destroy: function destroy (vnode) {
      registerRef(vnode, true);
    }
  };
  
  function registerRef (vnode, isRemoval) {
    var key = vnode.data.ref;
    if (!key) { return }
  
    var vm = vnode.context;
    var ref = vnode.componentInstance || vnode.elm;
    var refs = vm.$refs;
    if (isRemoval) {
      if (Array.isArray(refs[key])) {
        remove(refs[key], ref);
      } else if (refs[key] === ref) {
        refs[key] = undefined;
      }
    } else {
      if (vnode.data.refInFor) {
        if (!Array.isArray(refs[key])) {
          refs[key] = [ref];
        } else if (refs[key].indexOf(ref) < 0) {
          // $flow-disable-line
          refs[key].push(ref);
        }
      } else {
        refs[key] = ref;
      }
    }
  }
  
  /**
   * Virtual DOM patching algorithm based on Snabbdom by
   * Simon Friis Vindum (@paldepind)
   * Licensed under the MIT License
   * https://github.com/paldepind/snabbdom/blob/master/LICENSE
   *
   * modified by Evan You (@yyx990803)
   *
   * Not type-checking this because this file is perf-critical and the cost
   * of making flow understand it is not worth it.
   */
  
  var emptyNode = new VNode('', {}, []);
  
  var hooks = ['create', 'activate', 'update', 'remove', 'destroy'];
  
  function sameVnode (a, b) {
    return (
      a.key === b.key && (
        (
          a.tag === b.tag &&
          a.isComment === b.isComment &&
          isDef(a.data) === isDef(b.data) &&
          sameInputType(a, b)
        ) || (
          isTrue(a.isAsyncPlaceholder) &&
          a.asyncFactory === b.asyncFactory &&
          isUndef(b.asyncFactory.error)
        )
      )
    )
  }
  
  function sameInputType (a, b) {
    if (a.tag !== 'input') { return true }
    var i;
    var typeA = isDef(i = a.data) && isDef(i = i.attrs) && i.type;
    var typeB = isDef(i = b.data) && isDef(i = i.attrs) && i.type;
    return typeA === typeB || isTextInputType(typeA) && isTextInputType(typeB)
  }
  
  function createKeyToOldIdx (children, beginIdx, endIdx) {
    var i, key;
    var map = {};
    for (i = beginIdx; i <= endIdx; ++i) {
      key = children[i].key;
      if (isDef(key)) { map[key] = i; }
    }
    return map
  }
  
  function createPatchFunction (backend) {
    var i, j;
    var cbs = {};
  
    var modules = backend.modules;
    var nodeOps = backend.nodeOps;
  
    for (i = 0; i < hooks.length; ++i) {
      cbs[hooks[i]] = [];
      for (j = 0; j < modules.length; ++j) {
        if (isDef(modules[j][hooks[i]])) {
          cbs[hooks[i]].push(modules[j][hooks[i]]);
        }
      }
    }
  
    function emptyNodeAt (elm) {
      return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
    }
  
    function createRmCb (childElm, listeners) {
      function remove () {
        if (--remove.listeners === 0) {
          removeNode(childElm);
        }
      }
      remove.listeners = listeners;
      return remove
    }
  
    function removeNode (el) {
      var parent = nodeOps.parentNode(el);
      // element may have already been removed due to v-html / v-text
      if (isDef(parent)) {
        nodeOps.removeChild(parent, el);
      }
    }
  
    var inPre = 0;
    function createElm (vnode, insertedVnodeQueue, parentElm, refElm, nested) {
      vnode.isRootInsert = !nested; // for transition enter check
      if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
        return
      }
  
      var data = vnode.data;
      var children = vnode.children;
      var tag = vnode.tag;
      if (isDef(tag)) {
        if (process.env.NODE_ENV !== 'production') {
          if (data && data.pre) {
            inPre++;
          }
          if (
            !inPre &&
            !vnode.ns &&
            !(
              config.ignoredElements.length &&
              config.ignoredElements.some(function (ignore) {
                return isRegExp(ignore)
                  ? ignore.test(tag)
                  : ignore === tag
              })
            ) &&
            config.isUnknownElement(tag)
          ) {
            warn(
              'Unknown custom element: <' + tag + '> - did you ' +
              'register the component correctly? For recursive components, ' +
              'make sure to provide the "name" option.',
              vnode.context
            );
          }
        }
        vnode.elm = vnode.ns
          ? nodeOps.createElementNS(vnode.ns, tag)
          : nodeOps.createElement(tag, vnode);
        setScope(vnode);
  
        /* istanbul ignore if */
        {
          createChildren(vnode, children, insertedVnodeQueue);
          if (isDef(data)) {
            invokeCreateHooks(vnode, insertedVnodeQueue);
          }
          insert(parentElm, vnode.elm, refElm);
        }
  
        if (process.env.NODE_ENV !== 'production' && data && data.pre) {
          inPre--;
        }
      } else if (isTrue(vnode.isComment)) {
        vnode.elm = nodeOps.createComment(vnode.text);
        insert(parentElm, vnode.elm, refElm);
      } else {
        vnode.elm = nodeOps.createTextNode(vnode.text);
        insert(parentElm, vnode.elm, refElm);
      }
    }
  
    function createComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
      var i = vnode.data;
      if (isDef(i)) {
        var isReactivated = isDef(vnode.componentInstance) && i.keepAlive;
        if (isDef(i = i.hook) && isDef(i = i.init)) {
          i(vnode, false /* hydrating */, parentElm, refElm);
        }
        // after calling the init hook, if the vnode is a child component
        // it should've created a child instance and mounted it. the child
        // component also has set the placeholder vnode's elm.
        // in that case we can just return the element and be done.
        if (isDef(vnode.componentInstance)) {
          initComponent(vnode, insertedVnodeQueue);
          if (isTrue(isReactivated)) {
            reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
          }
          return true
        }
      }
    }
  
    function initComponent (vnode, insertedVnodeQueue) {
      if (isDef(vnode.data.pendingInsert)) {
        insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
        vnode.data.pendingInsert = null;
      }
      vnode.elm = vnode.componentInstance.$el;
      if (isPatchable(vnode)) {
        invokeCreateHooks(vnode, insertedVnodeQueue);
        setScope(vnode);
      } else {
        // empty component root.
        // skip all element-related modules except for ref (#3455)
        registerRef(vnode);
        // make sure to invoke the insert hook
        insertedVnodeQueue.push(vnode);
      }
    }
  
    function reactivateComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
      var i;
      // hack for #4339: a reactivated component with inner transition
      // does not trigger because the inner node's created hooks are not called
      // again. It's not ideal to involve module-specific logic in here but
      // there doesn't seem to be a better way to do it.
      var innerNode = vnode;
      while (innerNode.componentInstance) {
        innerNode = innerNode.componentInstance._vnode;
        if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
          for (i = 0; i < cbs.activate.length; ++i) {
            cbs.activate[i](emptyNode, innerNode);
          }
          insertedVnodeQueue.push(innerNode);
          break
        }
      }
      // unlike a newly created component,
      // a reactivated keep-alive component doesn't insert itself
      insert(parentElm, vnode.elm, refElm);
    }
  
    function insert (parent, elm, ref$$1) {
      if (isDef(parent)) {
        if (isDef(ref$$1)) {
          if (ref$$1.parentNode === parent) {
            nodeOps.insertBefore(parent, elm, ref$$1);
          }
        } else {
          nodeOps.appendChild(parent, elm);
        }
      }
    }
  
    function createChildren (vnode, children, insertedVnodeQueue) {
      if (Array.isArray(children)) {
        for (var i = 0; i < children.length; ++i) {
          createElm(children[i], insertedVnodeQueue, vnode.elm, null, true);
        }
      } else if (isPrimitive(vnode.text)) {
        nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(vnode.text));
      }
    }
  
    function isPatchable (vnode) {
      while (vnode.componentInstance) {
        vnode = vnode.componentInstance._vnode;
      }
      return isDef(vnode.tag)
    }
  
    function invokeCreateHooks (vnode, insertedVnodeQueue) {
      for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
        cbs.create[i$1](emptyNode, vnode);
      }
      i = vnode.data.hook; // Reuse variable
      if (isDef(i)) {
        if (isDef(i.create)) { i.create(emptyNode, vnode); }
        if (isDef(i.insert)) { insertedVnodeQueue.push(vnode); }
      }
    }
  
    // set scope id attribute for scoped CSS.
    // this is implemented as a special case to avoid the overhead
    // of going through the normal attribute patching process.
    function setScope (vnode) {
      var i;
      if (isDef(i = vnode.functionalScopeId)) {
        nodeOps.setAttribute(vnode.elm, i, '');
      } else {
        var ancestor = vnode;
        while (ancestor) {
          if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {
            nodeOps.setAttribute(vnode.elm, i, '');
          }
          ancestor = ancestor.parent;
        }
      }
      // for slot content they should also get the scopeId from the host instance.
      if (isDef(i = activeInstance) &&
        i !== vnode.context &&
        i !== vnode.functionalContext &&
        isDef(i = i.$options._scopeId)
      ) {
        nodeOps.setAttribute(vnode.elm, i, '');
      }
    }
  
    function addVnodes (parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
      for (; startIdx <= endIdx; ++startIdx) {
        createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm);
      }
    }
  
    function invokeDestroyHook (vnode) {
      var i, j;
      var data = vnode.data;
      if (isDef(data)) {
        if (isDef(i = data.hook) && isDef(i = i.destroy)) { i(vnode); }
        for (i = 0; i < cbs.destroy.length; ++i) { cbs.destroy[i](vnode); }
      }
      if (isDef(i = vnode.children)) {
        for (j = 0; j < vnode.children.length; ++j) {
          invokeDestroyHook(vnode.children[j]);
        }
      }
    }
  
    function removeVnodes (parentElm, vnodes, startIdx, endIdx) {
      for (; startIdx <= endIdx; ++startIdx) {
        var ch = vnodes[startIdx];
        if (isDef(ch)) {
          if (isDef(ch.tag)) {
            removeAndInvokeRemoveHook(ch);
            invokeDestroyHook(ch);
          } else { // Text node
            removeNode(ch.elm);
          }
        }
      }
    }
  
    function removeAndInvokeRemoveHook (vnode, rm) {
      if (isDef(rm) || isDef(vnode.data)) {
        var i;
        var listeners = cbs.remove.length + 1;
        if (isDef(rm)) {
          // we have a recursively passed down rm callback
          // increase the listeners count
          rm.listeners += listeners;
        } else {
          // directly removing
          rm = createRmCb(vnode.elm, listeners);
        }
        // recursively invoke hooks on child component root node
        if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
          removeAndInvokeRemoveHook(i, rm);
        }
        for (i = 0; i < cbs.remove.length; ++i) {
          cbs.remove[i](vnode, rm);
        }
        if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
          i(vnode, rm);
        } else {
          rm();
        }
      } else {
        removeNode(vnode.elm);
      }
    }
  
    function updateChildren (parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
      var oldStartIdx = 0;
      var newStartIdx = 0;
      var oldEndIdx = oldCh.length - 1;
      var oldStartVnode = oldCh[0];
      var oldEndVnode = oldCh[oldEndIdx];
      var newEndIdx = newCh.length - 1;
      var newStartVnode = newCh[0];
      var newEndVnode = newCh[newEndIdx];
      var oldKeyToIdx, idxInOld, vnodeToMove, refElm;
  
      // removeOnly is a special flag used only by <transition-group>
      // to ensure removed elements stay in correct relative positions
      // during leaving transitions
      var canMove = !removeOnly;
  
      while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
        if (isUndef(oldStartVnode)) {
          oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
        } else if (isUndef(oldEndVnode)) {
          oldEndVnode = oldCh[--oldEndIdx];
        } else if (sameVnode(oldStartVnode, newStartVnode)) {
          patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue);
          oldStartVnode = oldCh[++oldStartIdx];
          newStartVnode = newCh[++newStartIdx];
        } else if (sameVnode(oldEndVnode, newEndVnode)) {
          patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue);
          oldEndVnode = oldCh[--oldEndIdx];
          newEndVnode = newCh[--newEndIdx];
        } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
          patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue);
          canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
          oldStartVnode = oldCh[++oldStartIdx];
          newEndVnode = newCh[--newEndIdx];
        } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
          patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);
          canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
          oldEndVnode = oldCh[--oldEndIdx];
          newStartVnode = newCh[++newStartIdx];
        } else {
          if (isUndef(oldKeyToIdx)) { oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx); }
          idxInOld = isDef(newStartVnode.key)
            ? oldKeyToIdx[newStartVnode.key]
            : findIdxInOld(newStartVnode, oldCh, oldStartIdx, oldEndIdx);
          if (isUndef(idxInOld)) { // New element
            createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
          } else {
            vnodeToMove = oldCh[idxInOld];
            /* istanbul ignore if */
            if (process.env.NODE_ENV !== 'production' && !vnodeToMove) {
              warn(
                'It seems there are duplicate keys that is causing an update error. ' +
                'Make sure each v-for item has a unique key.'
              );
            }
            if (sameVnode(vnodeToMove, newStartVnode)) {
              patchVnode(vnodeToMove, newStartVnode, insertedVnodeQueue);
              oldCh[idxInOld] = undefined;
              canMove && nodeOps.insertBefore(parentElm, vnodeToMove.elm, oldStartVnode.elm);
            } else {
              // same key but different element. treat as new element
              createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
            }
          }
          newStartVnode = newCh[++newStartIdx];
        }
      }
      if (oldStartIdx > oldEndIdx) {
        refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;
        addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
      } else if (newStartIdx > newEndIdx) {
        removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);
      }
    }
  
    function findIdxInOld (node, oldCh, start, end) {
      for (var i = start; i < end; i++) {
        var c = oldCh[i];
        if (isDef(c) && sameVnode(node, c)) { return i }
      }
    }
  
    function patchVnode (oldVnode, vnode, insertedVnodeQueue, removeOnly) {
      if (oldVnode === vnode) {
        return
      }
  
      var elm = vnode.elm = oldVnode.elm;
  
      if (isTrue(oldVnode.isAsyncPlaceholder)) {
        if (isDef(vnode.asyncFactory.resolved)) {
          hydrate(oldVnode.elm, vnode, insertedVnodeQueue);
        } else {
          vnode.isAsyncPlaceholder = true;
        }
        return
      }
  
      // reuse element for static trees.
      // note we only do this if the vnode is cloned -
      // if the new node is not cloned it means the render functions have been
      // reset by the hot-reload-api and we need to do a proper re-render.
      if (isTrue(vnode.isStatic) &&
        isTrue(oldVnode.isStatic) &&
        vnode.key === oldVnode.key &&
        (isTrue(vnode.isCloned) || isTrue(vnode.isOnce))
      ) {
        vnode.componentInstance = oldVnode.componentInstance;
        return
      }
  
      var i;
      var data = vnode.data;
      if (isDef(data) && isDef(i = data.hook) && isDef(i = i.prepatch)) {
        i(oldVnode, vnode);
      }
  
      var oldCh = oldVnode.children;
      var ch = vnode.children;
      if (isDef(data) && isPatchable(vnode)) {
        for (i = 0; i < cbs.update.length; ++i) { cbs.update[i](oldVnode, vnode); }
        if (isDef(i = data.hook) && isDef(i = i.update)) { i(oldVnode, vnode); }
      }
      if (isUndef(vnode.text)) {
        if (isDef(oldCh) && isDef(ch)) {
          if (oldCh !== ch) { updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly); }
        } else if (isDef(ch)) {
          if (isDef(oldVnode.text)) { nodeOps.setTextContent(elm, ''); }
          addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
        } else if (isDef(oldCh)) {
          removeVnodes(elm, oldCh, 0, oldCh.length - 1);
        } else if (isDef(oldVnode.text)) {
          nodeOps.setTextContent(elm, '');
        }
      } else if (oldVnode.text !== vnode.text) {
        nodeOps.setTextContent(elm, vnode.text);
      }
      if (isDef(data)) {
        if (isDef(i = data.hook) && isDef(i = i.postpatch)) { i(oldVnode, vnode); }
      }
    }
  
    function invokeInsertHook (vnode, queue, initial) {
      // delay insert hooks for component root nodes, invoke them after the
      // element is really inserted
      if (isTrue(initial) && isDef(vnode.parent)) {
        vnode.parent.data.pendingInsert = queue;
      } else {
        for (var i = 0; i < queue.length; ++i) {
          queue[i].data.hook.insert(queue[i]);
        }
      }
    }
  
    var bailed = false;
    // list of modules that can skip create hook during hydration because they
    // are already rendered on the client or has no need for initialization
    var isRenderedModule = makeMap('attrs,style,class,staticClass,staticStyle,key');
  
    // Note: this is a browser-only function so we can assume elms are DOM nodes.
    function hydrate (elm, vnode, insertedVnodeQueue) {
      if (isTrue(vnode.isComment) && isDef(vnode.asyncFactory)) {
        vnode.elm = elm;
        vnode.isAsyncPlaceholder = true;
        return true
      }
      if (process.env.NODE_ENV !== 'production') {
        if (!assertNodeMatch(elm, vnode)) {
          return false
        }
      }
      vnode.elm = elm;
      var tag = vnode.tag;
      var data = vnode.data;
      var children = vnode.children;
      if (isDef(data)) {
        if (isDef(i = data.hook) && isDef(i = i.init)) { i(vnode, true /* hydrating */); }
        if (isDef(i = vnode.componentInstance)) {
          // child component. it should have hydrated its own tree.
          initComponent(vnode, insertedVnodeQueue);
          return true
        }
      }
      if (isDef(tag)) {
        if (isDef(children)) {
          // empty element, allow client to pick up and populate children
          if (!elm.hasChildNodes()) {
            createChildren(vnode, children, insertedVnodeQueue);
          } else {
            // v-html and domProps: innerHTML
            if (isDef(i = data) && isDef(i = i.domProps) && isDef(i = i.innerHTML)) {
              if (i !== elm.innerHTML) {
                /* istanbul ignore if */
                if (process.env.NODE_ENV !== 'production' &&
                  typeof console !== 'undefined' &&
                  !bailed
                ) {
                  bailed = true;
                  console.warn('Parent: ', elm);
                  console.warn('server innerHTML: ', i);
                  console.warn('client innerHTML: ', elm.innerHTML);
                }
                return false
              }
            } else {
              // iterate and compare children lists
              var childrenMatch = true;
              var childNode = elm.firstChild;
              for (var i$1 = 0; i$1 < children.length; i$1++) {
                if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue)) {
                  childrenMatch = false;
                  break
                }
                childNode = childNode.nextSibling;
              }
              // if childNode is not null, it means the actual childNodes list is
              // longer than the virtual children list.
              if (!childrenMatch || childNode) {
                /* istanbul ignore if */
                if (process.env.NODE_ENV !== 'production' &&
                  typeof console !== 'undefined' &&
                  !bailed
                ) {
                  bailed = true;
                  console.warn('Parent: ', elm);
                  console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
                }
                return false
              }
            }
          }
        }
        if (isDef(data)) {
          for (var key in data) {
            if (!isRenderedModule(key)) {
              invokeCreateHooks(vnode, insertedVnodeQueue);
              break
            }
          }
        }
      } else if (elm.data !== vnode.text) {
        elm.data = vnode.text;
      }
      return true
    }
  
    function assertNodeMatch (node, vnode) {
      if (isDef(vnode.tag)) {
        return (
          vnode.tag.indexOf('vue-component') === 0 ||
          vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())
        )
      } else {
        return node.nodeType === (vnode.isComment ? 8 : 3)
      }
    }
  
    return function patch (oldVnode, vnode, hydrating, removeOnly, parentElm, refElm) {
      if (isUndef(vnode)) {
        if (isDef(oldVnode)) { invokeDestroyHook(oldVnode); }
        return
      }
  
      var isInitialPatch = false;
      var insertedVnodeQueue = [];
  
      if (isUndef(oldVnode)) {
        // empty mount (likely as component), create new root element
        isInitialPatch = true;
        createElm(vnode, insertedVnodeQueue, parentElm, refElm);
      } else {
        var isRealElement = isDef(oldVnode.nodeType);
        if (!isRealElement && sameVnode(oldVnode, vnode)) {
          // patch existing root node
          patchVnode(oldVnode, vnode, insertedVnodeQueue, removeOnly);
        } else {
          if (isRealElement) {
            // mounting to a real element
            // check if this is server-rendered content and if we can perform
            // a successful hydration.
            if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {
              oldVnode.removeAttribute(SSR_ATTR);
              hydrating = true;
            }
            if (isTrue(hydrating)) {
              if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
                invokeInsertHook(vnode, insertedVnodeQueue, true);
                return oldVnode
              } else if (process.env.NODE_ENV !== 'production') {
                warn(
                  'The client-side rendered virtual DOM tree is not matching ' +
                  'server-rendered content. This is likely caused by incorrect ' +
                  'HTML markup, for example nesting block-level elements inside ' +
                  '<p>, or missing <tbody>. Bailing hydration and performing ' +
                  'full client-side render.'
                );
              }
            }
            // either not server-rendered, or hydration failed.
            // create an empty node and replace it
            oldVnode = emptyNodeAt(oldVnode);
          }
  
          // replacing existing element
          var oldElm = oldVnode.elm;
          var parentElm$1 = nodeOps.parentNode(oldElm);
  
          // create new node
          createElm(
            vnode,
            insertedVnodeQueue,
            // extremely rare edge case: do not insert if old element is in a
            // leaving transition. Only happens when combining transition +
            // keep-alive + HOCs. (#4590)
            oldElm._leaveCb ? null : parentElm$1,
            nodeOps.nextSibling(oldElm)
          );
  
          // update parent placeholder node element, recursively
          if (isDef(vnode.parent)) {
            var ancestor = vnode.parent;
            var patchable = isPatchable(vnode);
            while (ancestor) {
              for (var i = 0; i < cbs.destroy.length; ++i) {
                cbs.destroy[i](ancestor);
              }
              ancestor.elm = vnode.elm;
              if (patchable) {
                for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
                  cbs.create[i$1](emptyNode, ancestor);
                }
                // #6513
                // invoke insert hooks that may have been merged by create hooks.
                // e.g. for directives that uses the "inserted" hook.
                var insert = ancestor.data.hook.insert;
                if (insert.merged) {
                  // start at index 1 to avoid re-invoking component mounted hook
                  for (var i$2 = 1; i$2 < insert.fns.length; i$2++) {
                    insert.fns[i$2]();
                  }
                }
              } else {
                registerRef(ancestor);
              }
              ancestor = ancestor.parent;
            }
          }
  
          // destroy old node
          if (isDef(parentElm$1)) {
            removeVnodes(parentElm$1, [oldVnode], 0, 0);
          } else if (isDef(oldVnode.tag)) {
            invokeDestroyHook(oldVnode);
          }
        }
      }
  
      invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
      return vnode.elm
    }
  }
  
  /*  */
  
  var directives = {
    create: updateDirectives,
    update: updateDirectives,
    destroy: function unbindDirectives (vnode) {
      updateDirectives(vnode, emptyNode);
    }
  };
  
  function updateDirectives (oldVnode, vnode) {
    if (oldVnode.data.directives || vnode.data.directives) {
      _update(oldVnode, vnode);
    }
  }
  
  function _update (oldVnode, vnode) {
    var isCreate = oldVnode === emptyNode;
    var isDestroy = vnode === emptyNode;
    var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
    var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);
  
    var dirsWithInsert = [];
    var dirsWithPostpatch = [];
  
    var key, oldDir, dir;
    for (key in newDirs) {
      oldDir = oldDirs[key];
      dir = newDirs[key];
      if (!oldDir) {
        // new directive, bind
        callHook$1(dir, 'bind', vnode, oldVnode);
        if (dir.def && dir.def.inserted) {
          dirsWithInsert.push(dir);
        }
      } else {
        // existing directive, update
        dir.oldValue = oldDir.value;
        callHook$1(dir, 'update', vnode, oldVnode);
        if (dir.def && dir.def.componentUpdated) {
          dirsWithPostpatch.push(dir);
        }
      }
    }
  
    if (dirsWithInsert.length) {
      var callInsert = function () {
        for (var i = 0; i < dirsWithInsert.length; i++) {
          callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
        }
      };
      if (isCreate) {
        mergeVNodeHook(vnode, 'insert', callInsert);
      } else {
        callInsert();
      }
    }
  
    if (dirsWithPostpatch.length) {
      mergeVNodeHook(vnode, 'postpatch', function () {
        for (var i = 0; i < dirsWithPostpatch.length; i++) {
          callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);
        }
      });
    }
  
    if (!isCreate) {
      for (key in oldDirs) {
        if (!newDirs[key]) {
          // no longer present, unbind
          callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);
        }
      }
    }
  }
  
  var emptyModifiers = Object.create(null);
  
  function normalizeDirectives$1 (
    dirs,
    vm
  ) {
    var res = Object.create(null);
    if (!dirs) {
      return res
    }
    var i, dir;
    for (i = 0; i < dirs.length; i++) {
      dir = dirs[i];
      if (!dir.modifiers) {
        dir.modifiers = emptyModifiers;
      }
      res[getRawDirName(dir)] = dir;
      dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
    }
    return res
  }
  
  function getRawDirName (dir) {
    return dir.rawName || ((dir.name) + "." + (Object.keys(dir.modifiers || {}).join('.')))
  }
  
  function callHook$1 (dir, hook, vnode, oldVnode, isDestroy) {
    var fn = dir.def && dir.def[hook];
    if (fn) {
      try {
        fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
      } catch (e) {
        handleError(e, vnode.context, ("directive " + (dir.name) + " " + hook + " hook"));
      }
    }
  }
  
  var baseModules = [
    ref,
    directives
  ];
  
  /*  */
  
  function updateAttrs (oldVnode, vnode) {
    var opts = vnode.componentOptions;
    if (isDef(opts) && opts.Ctor.options.inheritAttrs === false) {
      return
    }
    if (isUndef(oldVnode.data.attrs) && isUndef(vnode.data.attrs)) {
      return
    }
    var key, cur, old;
    var elm = vnode.elm;
    var oldAttrs = oldVnode.data.attrs || {};
    var attrs = vnode.data.attrs || {};
    // clone observed objects, as the user probably wants to mutate it
    if (isDef(attrs.__ob__)) {
      attrs = vnode.data.attrs = extend({}, attrs);
    }
  
    for (key in attrs) {
      cur = attrs[key];
      old = oldAttrs[key];
      if (old !== cur) {
        setAttr(elm, key, cur);
      }
    }
    // #4391: in IE9, setting type can reset value for input[type=radio]
    // #6666: IE/Edge forces progress value down to 1 before setting a max
    /* istanbul ignore if */
    if ((isIE9 || isEdge) && attrs.value !== oldAttrs.value) {
      setAttr(elm, 'value', attrs.value);
    }
    for (key in oldAttrs) {
      if (isUndef(attrs[key])) {
        if (isXlink(key)) {
          elm.removeAttributeNS(xlinkNS, getXlinkProp(key));
        } else if (!isEnumeratedAttr(key)) {
          elm.removeAttribute(key);
        }
      }
    }
  }
  
  function setAttr (el, key, value) {
    if (isBooleanAttr(key)) {
      // set attribute for blank value
      // e.g. <option disabled>Select one</option>
      if (isFalsyAttrValue(value)) {
        el.removeAttribute(key);
      } else {
        // technically allowfullscreen is a boolean attribute for <iframe>,
        // but Flash expects a value of "true" when used on <embed> tag
        value = key === 'allowfullscreen' && el.tagName === 'EMBED'
          ? 'true'
          : key;
        el.setAttribute(key, value);
      }
    } else if (isEnumeratedAttr(key)) {
      el.setAttribute(key, isFalsyAttrValue(value) || value === 'false' ? 'false' : 'true');
    } else if (isXlink(key)) {
      if (isFalsyAttrValue(value)) {
        el.removeAttributeNS(xlinkNS, getXlinkProp(key));
      } else {
        el.setAttributeNS(xlinkNS, key, value);
      }
    } else {
      if (isFalsyAttrValue(value)) {
        el.removeAttribute(key);
      } else {
        el.setAttribute(key, value);
      }
    }
  }
  
  var attrs = {
    create: updateAttrs,
    update: updateAttrs
  };
  
  /*  */
  
  function updateClass (oldVnode, vnode) {
    var el = vnode.elm;
    var data = vnode.data;
    var oldData = oldVnode.data;
    if (
      isUndef(data.staticClass) &&
      isUndef(data.class) && (
        isUndef(oldData) || (
          isUndef(oldData.staticClass) &&
          isUndef(oldData.class)
        )
      )
    ) {
      return
    }
  
    var cls = genClassForVnode(vnode);
  
    // handle transition classes
    var transitionClass = el._transitionClasses;
    if (isDef(transitionClass)) {
      cls = concat(cls, stringifyClass(transitionClass));
    }
  
    // set the class
    if (cls !== el._prevClass) {
      el.setAttribute('class', cls);
      el._prevClass = cls;
    }
  }
  
  var klass = {
    create: updateClass,
    update: updateClass
  };
  
  /*  */
  
  var validDivisionCharRE = /[\w).+\-_$\]]/;
  
  function parseFilters (exp) {
    var inSingle = false;
    var inDouble = false;
    var inTemplateString = false;
    var inRegex = false;
    var curly = 0;
    var square = 0;
    var paren = 0;
    var lastFilterIndex = 0;
    var c, prev, i, expression, filters;
  
    for (i = 0; i < exp.length; i++) {
      prev = c;
      c = exp.charCodeAt(i);
      if (inSingle) {
        if (c === 0x27 && prev !== 0x5C) { inSingle = false; }
      } else if (inDouble) {
        if (c === 0x22 && prev !== 0x5C) { inDouble = false; }
      } else if (inTemplateString) {
        if (c === 0x60 && prev !== 0x5C) { inTemplateString = false; }
      } else if (inRegex) {
        if (c === 0x2f && prev !== 0x5C) { inRegex = false; }
      } else if (
        c === 0x7C && // pipe
        exp.charCodeAt(i + 1) !== 0x7C &&
        exp.charCodeAt(i - 1) !== 0x7C &&
        !curly && !square && !paren
      ) {
        if (expression === undefined) {
          // first filter, end of expression
          lastFilterIndex = i + 1;
          expression = exp.slice(0, i).trim();
        } else {
          pushFilter();
        }
      } else {
        switch (c) {
          case 0x22: inDouble = true; break         // "
          case 0x27: inSingle = true; break         // '
          case 0x60: inTemplateString = true; break // `
          case 0x28: paren++; break                 // (
          case 0x29: paren--; break                 // )
          case 0x5B: square++; break                // [
          case 0x5D: square--; break                // ]
          case 0x7B: curly++; break                 // {
          case 0x7D: curly--; break                 // }
        }
        if (c === 0x2f) { // /
          var j = i - 1;
          var p = (void 0);
          // find first non-whitespace prev char
          for (; j >= 0; j--) {
            p = exp.charAt(j);
            if (p !== ' ') { break }
          }
          if (!p || !validDivisionCharRE.test(p)) {
            inRegex = true;
          }
        }
      }
    }
  
    if (expression === undefined) {
      expression = exp.slice(0, i).trim();
    } else if (lastFilterIndex !== 0) {
      pushFilter();
    }
  
    function pushFilter () {
      (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());
      lastFilterIndex = i + 1;
    }
  
    if (filters) {
      for (i = 0; i < filters.length; i++) {
        expression = wrapFilter(expression, filters[i]);
      }
    }
  
    return expression
  }
  
  function wrapFilter (exp, filter) {
    var i = filter.indexOf('(');
    if (i < 0) {
      // _f: resolveFilter
      return ("_f(\"" + filter + "\")(" + exp + ")")
    } else {
      var name = filter.slice(0, i);
      var args = filter.slice(i + 1);
      return ("_f(\"" + name + "\")(" + exp + "," + args)
    }
  }
  
  /*  */
  
  function baseWarn (msg) {
    console.error(("[Vue compiler]: " + msg));
  }
  
  function pluckModuleFunction (
    modules,
    key
  ) {
    return modules
      ? modules.map(function (m) { return m[key]; }).filter(function (_) { return _; })
      : []
  }
  
  function addProp (el, name, value) {
    (el.props || (el.props = [])).push({ name: name, value: value });
  }
  
  function addAttr (el, name, value) {
    (el.attrs || (el.attrs = [])).push({ name: name, value: value });
  }
  
  function addDirective (
    el,
    name,
    rawName,
    value,
    arg,
    modifiers
  ) {
    (el.directives || (el.directives = [])).push({ name: name, rawName: rawName, value: value, arg: arg, modifiers: modifiers });
  }
  
  function addHandler (
    el,
    name,
    value,
    modifiers,
    important,
    warn
  ) {
    // warn prevent and passive modifier
    /* istanbul ignore if */
    if (
      process.env.NODE_ENV !== 'production' && warn &&
      modifiers && modifiers.prevent && modifiers.passive
    ) {
      warn(
        'passive and prevent can\'t be used together. ' +
        'Passive handler can\'t prevent default event.'
      );
    }
    // check capture modifier
    if (modifiers && modifiers.capture) {
      delete modifiers.capture;
      name = '!' + name; // mark the event as captured
    }
    if (modifiers && modifiers.once) {
      delete modifiers.once;
      name = '~' + name; // mark the event as once
    }
    /* istanbul ignore if */
    if (modifiers && modifiers.passive) {
      delete modifiers.passive;
      name = '&' + name; // mark the event as passive
    }
    var events;
    if (modifiers && modifiers.native) {
      delete modifiers.native;
      events = el.nativeEvents || (el.nativeEvents = {});
    } else {
      events = el.events || (el.events = {});
    }
    var newHandler = { value: value, modifiers: modifiers };
    var handlers = events[name];
    /* istanbul ignore if */
    if (Array.isArray(handlers)) {
      important ? handlers.unshift(newHandler) : handlers.push(newHandler);
    } else if (handlers) {
      events[name] = important ? [newHandler, handlers] : [handlers, newHandler];
    } else {
      events[name] = newHandler;
    }
  }
  
  function getBindingAttr (
    el,
    name,
    getStatic
  ) {
    var dynamicValue =
      getAndRemoveAttr(el, ':' + name) ||
      getAndRemoveAttr(el, 'v-bind:' + name);
    if (dynamicValue != null) {
      return parseFilters(dynamicValue)
    } else if (getStatic !== false) {
      var staticValue = getAndRemoveAttr(el, name);
      if (staticValue != null) {
        return JSON.stringify(staticValue)
      }
    }
  }
  
  // note: this only removes the attr from the Array (attrsList) so that it
  // doesn't get processed by processAttrs.
  // By default it does NOT remove it from the map (attrsMap) because the map is
  // needed during codegen.
  function getAndRemoveAttr (
    el,
    name,
    removeFromMap
  ) {
    var val;
    if ((val = el.attrsMap[name]) != null) {
      var list = el.attrsList;
      for (var i = 0, l = list.length; i < l; i++) {
        if (list[i].name === name) {
          list.splice(i, 1);
          break
        }
      }
    }
    if (removeFromMap) {
      delete el.attrsMap[name];
    }
    return val
  }
  
  /*  */
  
  /**
   * Cross-platform code generation for component v-model
   */
  function genComponentModel (
    el,
    value,
    modifiers
  ) {
    var ref = modifiers || {};
    var number = ref.number;
    var trim = ref.trim;
  
    var baseValueExpression = '$$v';
    var valueExpression = baseValueExpression;
    if (trim) {
      valueExpression =
        "(typeof " + baseValueExpression + " === 'string'" +
          "? " + baseValueExpression + ".trim()" +
          ": " + baseValueExpression + ")";
    }
    if (number) {
      valueExpression = "_n(" + valueExpression + ")";
    }
    var assignment = genAssignmentCode(value, valueExpression);
  
    el.model = {
      value: ("(" + value + ")"),
      expression: ("\"" + value + "\""),
      callback: ("function (" + baseValueExpression + ") {" + assignment + "}")
    };
  }
  
  /**
   * Cross-platform codegen helper for generating v-model value assignment code.
   */
  function genAssignmentCode (
    value,
    assignment
  ) {
    var res = parseModel(value);
    if (res.key === null) {
      return (value + "=" + assignment)
    } else {
      return ("$set(" + (res.exp) + ", " + (res.key) + ", " + assignment + ")")
    }
  }
  
  /**
   * Parse a v-model expression into a base path and a final key segment.
   * Handles both dot-path and possible square brackets.
   *
   * Possible cases:
   *
   * - test
   * - test[key]
   * - test[test1[key]]
   * - test["a"][key]
   * - xxx.test[a[a].test1[key]]
   * - test.xxx.a["asa"][test1[key]]
   *
   */
  
  var len;
  var str;
  var chr;
  var index$1;
  var expressionPos;
  var expressionEndPos;
  
  
  
  function parseModel (val) {
    len = val.length;
  
    if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {
      index$1 = val.lastIndexOf('.');
      if (index$1 > -1) {
        return {
          exp: val.slice(0, index$1),
          key: '"' + val.slice(index$1 + 1) + '"'
        }
      } else {
        return {
          exp: val,
          key: null
        }
      }
    }
  
    str = val;
    index$1 = expressionPos = expressionEndPos = 0;
  
    while (!eof()) {
      chr = next();
      /* istanbul ignore if */
      if (isStringStart(chr)) {
        parseString(chr);
      } else if (chr === 0x5B) {
        parseBracket(chr);
      }
    }
  
    return {
      exp: val.slice(0, expressionPos),
      key: val.slice(expressionPos + 1, expressionEndPos)
    }
  }
  
  function next () {
    return str.charCodeAt(++index$1)
  }
  
  function eof () {
    return index$1 >= len
  }
  
  function isStringStart (chr) {
    return chr === 0x22 || chr === 0x27
  }
  
  function parseBracket (chr) {
    var inBracket = 1;
    expressionPos = index$1;
    while (!eof()) {
      chr = next();
      if (isStringStart(chr)) {
        parseString(chr);
        continue
      }
      if (chr === 0x5B) { inBracket++; }
      if (chr === 0x5D) { inBracket--; }
      if (inBracket === 0) {
        expressionEndPos = index$1;
        break
      }
    }
  }
  
  function parseString (chr) {
    var stringQuote = chr;
    while (!eof()) {
      chr = next();
      if (chr === stringQuote) {
        break
      }
    }
  }
  
  /*  */
  
  var warn$1;
  
  // in some cases, the event used has to be determined at runtime
  // so we used some reserved tokens during compile.
  var RANGE_TOKEN = '__r';
  var CHECKBOX_RADIO_TOKEN = '__c';
  
  function model (
    el,
    dir,
    _warn
  ) {
    warn$1 = _warn;
    var value = dir.value;
    var modifiers = dir.modifiers;
    var tag = el.tag;
    var type = el.attrsMap.type;
  
    if (process.env.NODE_ENV !== 'production') {
      // inputs with type="file" are read only and setting the input's
      // value will throw an error.
      if (tag === 'input' && type === 'file') {
        warn$1(
          "<" + (el.tag) + " v-model=\"" + value + "\" type=\"file\">:\n" +
          "File inputs are read only. Use a v-on:change listener instead."
        );
      }
    }
  
    if (el.component) {
      genComponentModel(el, value, modifiers);
      // component v-model doesn't need extra runtime
      return false
    } else if (tag === 'select') {
      genSelect(el, value, modifiers);
    } else if (tag === 'input' && type === 'checkbox') {
      genCheckboxModel(el, value, modifiers);
    } else if (tag === 'input' && type === 'radio') {
      genRadioModel(el, value, modifiers);
    } else if (tag === 'input' || tag === 'textarea') {
      genDefaultModel(el, value, modifiers);
    } else if (!config.isReservedTag(tag)) {
      genComponentModel(el, value, modifiers);
      // component v-model doesn't need extra runtime
      return false
    } else if (process.env.NODE_ENV !== 'production') {
      warn$1(
        "<" + (el.tag) + " v-model=\"" + value + "\">: " +
        "v-model is not supported on this element type. " +
        'If you are working with contenteditable, it\'s recommended to ' +
        'wrap a library dedicated for that purpose inside a custom component.'
      );
    }
  
    // ensure runtime directive metadata
    return true
  }
  
  function genCheckboxModel (
    el,
    value,
    modifiers
  ) {
    var number = modifiers && modifiers.number;
    var valueBinding = getBindingAttr(el, 'value') || 'null';
    var trueValueBinding = getBindingAttr(el, 'true-value') || 'true';
    var falseValueBinding = getBindingAttr(el, 'false-value') || 'false';
    addProp(el, 'checked',
      "Array.isArray(" + value + ")" +
        "?_i(" + value + "," + valueBinding + ")>-1" + (
          trueValueBinding === 'true'
            ? (":(" + value + ")")
            : (":_q(" + value + "," + trueValueBinding + ")")
        )
    );
    addHandler(el, 'change',
      "var $$a=" + value + "," +
          '$$el=$event.target,' +
          "$$c=$$el.checked?(" + trueValueBinding + "):(" + falseValueBinding + ");" +
      'if(Array.isArray($$a)){' +
        "var $$v=" + (number ? '_n(' + valueBinding + ')' : valueBinding) + "," +
            '$$i=_i($$a,$$v);' +
        "if($$el.checked){$$i<0&&(" + value + "=$$a.concat([$$v]))}" +
        "else{$$i>-1&&(" + value + "=$$a.slice(0,$$i).concat($$a.slice($$i+1)))}" +
      "}else{" + (genAssignmentCode(value, '$$c')) + "}",
      null, true
    );
  }
  
  function genRadioModel (
      el,
      value,
      modifiers
  ) {
    var number = modifiers && modifiers.number;
    var valueBinding = getBindingAttr(el, 'value') || 'null';
    valueBinding = number ? ("_n(" + valueBinding + ")") : valueBinding;
    addProp(el, 'checked', ("_q(" + value + "," + valueBinding + ")"));
    addHandler(el, 'change', genAssignmentCode(value, valueBinding), null, true);
  }
  
  function genSelect (
      el,
      value,
      modifiers
  ) {
    var number = modifiers && modifiers.number;
    var selectedVal = "Array.prototype.filter" +
      ".call($event.target.options,function(o){return o.selected})" +
      ".map(function(o){var val = \"_value\" in o ? o._value : o.value;" +
      "return " + (number ? '_n(val)' : 'val') + "})";
  
    var assignment = '$event.target.multiple ? $$selectedVal : $$selectedVal[0]';
    var code = "var $$selectedVal = " + selectedVal + ";";
    code = code + " " + (genAssignmentCode(value, assignment));
    addHandler(el, 'change', code, null, true);
  }
  
  function genDefaultModel (
    el,
    value,
    modifiers
  ) {
    var type = el.attrsMap.type;
    var ref = modifiers || {};
    var lazy = ref.lazy;
    var number = ref.number;
    var trim = ref.trim;
    var needCompositionGuard = !lazy && type !== 'range';
    var event = lazy
      ? 'change'
      : type === 'range'
        ? RANGE_TOKEN
        : 'input';
  
    var valueExpression = '$event.target.value';
    if (trim) {
      valueExpression = "$event.target.value.trim()";
    }
    if (number) {
      valueExpression = "_n(" + valueExpression + ")";
    }
  
    var code = genAssignmentCode(value, valueExpression);
    if (needCompositionGuard) {
      code = "if($event.target.composing)return;" + code;
    }
  
    addProp(el, 'value', ("(" + value + ")"));
    addHandler(el, event, code, null, true);
    if (trim || number) {
      addHandler(el, 'blur', '$forceUpdate()');
    }
  }
  
  /*  */
  
  // normalize v-model event tokens that can only be determined at runtime.
  // it's important to place the event as the first in the array because
  // the whole point is ensuring the v-model callback gets called before
  // user-attached handlers.
  function normalizeEvents (on) {
    /* istanbul ignore if */
    if (isDef(on[RANGE_TOKEN])) {
      // IE input[type=range] only supports `change` event
      var event = isIE ? 'change' : 'input';
      on[event] = [].concat(on[RANGE_TOKEN], on[event] || []);
      delete on[RANGE_TOKEN];
    }
    // This was originally intended to fix #4521 but no longer necessary
    // after 2.5. Keeping it for backwards compat with generated code from < 2.4
    /* istanbul ignore if */
    if (isDef(on[CHECKBOX_RADIO_TOKEN])) {
      on.change = [].concat(on[CHECKBOX_RADIO_TOKEN], on.change || []);
      delete on[CHECKBOX_RADIO_TOKEN];
    }
  }
  
  var target$1;
  
  function createOnceHandler (handler, event, capture) {
    var _target = target$1; // save current target element in closure
    return function onceHandler () {
      var res = handler.apply(null, arguments);
      if (res !== null) {
        remove$2(event, onceHandler, capture, _target);
      }
    }
  }
  
  function add$1 (
    event,
    handler,
    once$$1,
    capture,
    passive
  ) {
    handler = withMacroTask(handler);
    if (once$$1) { handler = createOnceHandler(handler, event, capture); }
    target$1.addEventListener(
      event,
      handler,
      supportsPassive
        ? { capture: capture, passive: passive }
        : capture
    );
  }
  
  function remove$2 (
    event,
    handler,
    capture,
    _target
  ) {
    (_target || target$1).removeEventListener(
      event,
      handler._withTask || handler,
      capture
    );
  }
  
  function updateDOMListeners (oldVnode, vnode) {
    if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {
      return
    }
    var on = vnode.data.on || {};
    var oldOn = oldVnode.data.on || {};
    target$1 = vnode.elm;
    normalizeEvents(on);
    updateListeners(on, oldOn, add$1, remove$2, vnode.context);
    target$1 = undefined;
  }
  
  var events = {
    create: updateDOMListeners,
    update: updateDOMListeners
  };
  
  /*  */
  
  function updateDOMProps (oldVnode, vnode) {
    if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {
      return
    }
    var key, cur;
    var elm = vnode.elm;
    var oldProps = oldVnode.data.domProps || {};
    var props = vnode.data.domProps || {};
    // clone observed objects, as the user probably wants to mutate it
    if (isDef(props.__ob__)) {
      props = vnode.data.domProps = extend({}, props);
    }
  
    for (key in oldProps) {
      if (isUndef(props[key])) {
        elm[key] = '';
      }
    }
    for (key in props) {
      cur = props[key];
      // ignore children if the node has textContent or innerHTML,
      // as these will throw away existing DOM nodes and cause removal errors
      // on subsequent patches (#3360)
      if (key === 'textContent' || key === 'innerHTML') {
        if (vnode.children) { vnode.children.length = 0; }
        if (cur === oldProps[key]) { continue }
        // #6601 work around Chrome version <= 55 bug where single textNode
        // replaced by innerHTML/textContent retains its parentNode property
        if (elm.childNodes.length === 1) {
          elm.removeChild(elm.childNodes[0]);
        }
      }
  
      if (key === 'value') {
        // store value as _value as well since
        // non-string values will be stringified
        elm._value = cur;
        // avoid resetting cursor position when value is the same
        var strCur = isUndef(cur) ? '' : String(cur);
        if (shouldUpdateValue(elm, strCur)) {
          elm.value = strCur;
        }
      } else {
        elm[key] = cur;
      }
    }
  }
  
  // check platforms/web/util/attrs.js acceptValue
  
  
  function shouldUpdateValue (elm, checkVal) {
    return (!elm.composing && (
      elm.tagName === 'OPTION' ||
      isDirty(elm, checkVal) ||
      isInputChanged(elm, checkVal)
    ))
  }
  
  function isDirty (elm, checkVal) {
    // return true when textbox (.number and .trim) loses focus and its value is
    // not equal to the updated value
    var notInFocus = true;
    // #6157
    // work around IE bug when accessing document.activeElement in an iframe
    try { notInFocus = document.activeElement !== elm; } catch (e) {}
    return notInFocus && elm.value !== checkVal
  }
  
  function isInputChanged (elm, newVal) {
    var value = elm.value;
    var modifiers = elm._vModifiers; // injected by v-model runtime
    if (isDef(modifiers) && modifiers.number) {
      return toNumber(value) !== toNumber(newVal)
    }
    if (isDef(modifiers) && modifiers.trim) {
      return value.trim() !== newVal.trim()
    }
    return value !== newVal
  }
  
  var domProps = {
    create: updateDOMProps,
    update: updateDOMProps
  };
  
  /*  */
  
  var parseStyleText = cached(function (cssText) {
    var res = {};
    var listDelimiter = /;(?![^(]*\))/g;
    var propertyDelimiter = /:(.+)/;
    cssText.split(listDelimiter).forEach(function (item) {
      if (item) {
        var tmp = item.split(propertyDelimiter);
        tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());
      }
    });
    return res
  });
  
  // merge static and dynamic style data on the same vnode
  function normalizeStyleData (data) {
    var style = normalizeStyleBinding(data.style);
    // static style is pre-processed into an object during compilation
    // and is always a fresh object, so it's safe to merge into it
    return data.staticStyle
      ? extend(data.staticStyle, style)
      : style
  }
  
  // normalize possible array / string values into Object
  function normalizeStyleBinding (bindingStyle) {
    if (Array.isArray(bindingStyle)) {
      return toObject(bindingStyle)
    }
    if (typeof bindingStyle === 'string') {
      return parseStyleText(bindingStyle)
    }
    return bindingStyle
  }
  
  /**
   * parent component style should be after child's
   * so that parent component's style could override it
   */
  function getStyle (vnode, checkChild) {
    var res = {};
    var styleData;
  
    if (checkChild) {
      var childNode = vnode;
      while (childNode.componentInstance) {
        childNode = childNode.componentInstance._vnode;
        if (childNode.data && (styleData = normalizeStyleData(childNode.data))) {
          extend(res, styleData);
        }
      }
    }
  
    if ((styleData = normalizeStyleData(vnode.data))) {
      extend(res, styleData);
    }
  
    var parentNode = vnode;
    while ((parentNode = parentNode.parent)) {
      if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {
        extend(res, styleData);
      }
    }
    return res
  }
  
  /*  */
  
  var cssVarRE = /^--/;
  var importantRE = /\s*!important$/;
  var setProp = function (el, name, val) {
    /* istanbul ignore if */
    if (cssVarRE.test(name)) {
      el.style.setProperty(name, val);
    } else if (importantRE.test(val)) {
      el.style.setProperty(name, val.replace(importantRE, ''), 'important');
    } else {
      var normalizedName = normalize(name);
      if (Array.isArray(val)) {
        // Support values array created by autoprefixer, e.g.
        // {display: ["-webkit-box", "-ms-flexbox", "flex"]}
        // Set them one by one, and the browser will only set those it can recognize
        for (var i = 0, len = val.length; i < len; i++) {
          el.style[normalizedName] = val[i];
        }
      } else {
        el.style[normalizedName] = val;
      }
    }
  };
  
  var vendorNames = ['Webkit', 'Moz', 'ms'];
  
  var emptyStyle;
  var normalize = cached(function (prop) {
    emptyStyle = emptyStyle || document.createElement('div').style;
    prop = camelize(prop);
    if (prop !== 'filter' && (prop in emptyStyle)) {
      return prop
    }
    var capName = prop.charAt(0).toUpperCase() + prop.slice(1);
    for (var i = 0; i < vendorNames.length; i++) {
      var name = vendorNames[i] + capName;
      if (name in emptyStyle) {
        return name
      }
    }
  });
  
  function updateStyle (oldVnode, vnode) {
    var data = vnode.data;
    var oldData = oldVnode.data;
  
    if (isUndef(data.staticStyle) && isUndef(data.style) &&
      isUndef(oldData.staticStyle) && isUndef(oldData.style)
    ) {
      return
    }
  
    var cur, name;
    var el = vnode.elm;
    var oldStaticStyle = oldData.staticStyle;
    var oldStyleBinding = oldData.normalizedStyle || oldData.style || {};
  
    // if static style exists, stylebinding already merged into it when doing normalizeStyleData
    var oldStyle = oldStaticStyle || oldStyleBinding;
  
    var style = normalizeStyleBinding(vnode.data.style) || {};
  
    // store normalized style under a different key for next diff
    // make sure to clone it if it's reactive, since the user likely wants
    // to mutate it.
    vnode.data.normalizedStyle = isDef(style.__ob__)
      ? extend({}, style)
      : style;
  
    var newStyle = getStyle(vnode, true);
  
    for (name in oldStyle) {
      if (isUndef(newStyle[name])) {
        setProp(el, name, '');
      }
    }
    for (name in newStyle) {
      cur = newStyle[name];
      if (cur !== oldStyle[name]) {
        // ie9 setting to null has no effect, must use empty string
        setProp(el, name, cur == null ? '' : cur);
      }
    }
  }
  
  var style = {
    create: updateStyle,
    update: updateStyle
  };
  
  /*  */
  
  /**
   * Add class with compatibility for SVG since classList is not supported on
   * SVG elements in IE
   */
  function addClass (el, cls) {
    /* istanbul ignore if */
    if (!cls || !(cls = cls.trim())) {
      return
    }
  
    /* istanbul ignore else */
    if (el.classList) {
      if (cls.indexOf(' ') > -1) {
        cls.split(/\s+/).forEach(function (c) { return el.classList.add(c); });
      } else {
        el.classList.add(cls);
      }
    } else {
      var cur = " " + (el.getAttribute('class') || '') + " ";
      if (cur.indexOf(' ' + cls + ' ') < 0) {
        el.setAttribute('class', (cur + cls).trim());
      }
    }
  }
  
  /**
   * Remove class with compatibility for SVG since classList is not supported on
   * SVG elements in IE
   */
  function removeClass (el, cls) {
    /* istanbul ignore if */
    if (!cls || !(cls = cls.trim())) {
      return
    }
  
    /* istanbul ignore else */
    if (el.classList) {
      if (cls.indexOf(' ') > -1) {
        cls.split(/\s+/).forEach(function (c) { return el.classList.remove(c); });
      } else {
        el.classList.remove(cls);
      }
      if (!el.classList.length) {
        el.removeAttribute('class');
      }
    } else {
      var cur = " " + (el.getAttribute('class') || '') + " ";
      var tar = ' ' + cls + ' ';
      while (cur.indexOf(tar) >= 0) {
        cur = cur.replace(tar, ' ');
      }
      cur = cur.trim();
      if (cur) {
        el.setAttribute('class', cur);
      } else {
        el.removeAttribute('class');
      }
    }
  }
  
  /*  */
  
  function resolveTransition (def) {
    if (!def) {
      return
    }
    /* istanbul ignore else */
    if (typeof def === 'object') {
      var res = {};
      if (def.css !== false) {
        extend(res, autoCssTransition(def.name || 'v'));
      }
      extend(res, def);
      return res
    } else if (typeof def === 'string') {
      return autoCssTransition(def)
    }
  }
  
  var autoCssTransition = cached(function (name) {
    return {
      enterClass: (name + "-enter"),
      enterToClass: (name + "-enter-to"),
      enterActiveClass: (name + "-enter-active"),
      leaveClass: (name + "-leave"),
      leaveToClass: (name + "-leave-to"),
      leaveActiveClass: (name + "-leave-active")
    }
  });
  
  var hasTransition = inBrowser && !isIE9;
  var TRANSITION = 'transition';
  var ANIMATION = 'animation';
  
  // Transition property/event sniffing
  var transitionProp = 'transition';
  var transitionEndEvent = 'transitionend';
  var animationProp = 'animation';
  var animationEndEvent = 'animationend';
  if (hasTransition) {
    /* istanbul ignore if */
    if (window.ontransitionend === undefined &&
      window.onwebkittransitionend !== undefined
    ) {
      transitionProp = 'WebkitTransition';
      transitionEndEvent = 'webkitTransitionEnd';
    }
    if (window.onanimationend === undefined &&
      window.onwebkitanimationend !== undefined
    ) {
      animationProp = 'WebkitAnimation';
      animationEndEvent = 'webkitAnimationEnd';
    }
  }
  
  // binding to window is necessary to make hot reload work in IE in strict mode
  var raf = inBrowser
    ? window.requestAnimationFrame
      ? window.requestAnimationFrame.bind(window)
      : setTimeout
    : /* istanbul ignore next */ function (fn) { return fn(); };
  
  function nextFrame (fn) {
    raf(function () {
      raf(fn);
    });
  }
  
  function addTransitionClass (el, cls) {
    var transitionClasses = el._transitionClasses || (el._transitionClasses = []);
    if (transitionClasses.indexOf(cls) < 0) {
      transitionClasses.push(cls);
      addClass(el, cls);
    }
  }
  
  function removeTransitionClass (el, cls) {
    if (el._transitionClasses) {
      remove(el._transitionClasses, cls);
    }
    removeClass(el, cls);
  }
  
  function whenTransitionEnds (
    el,
    expectedType,
    cb
  ) {
    var ref = getTransitionInfo(el, expectedType);
    var type = ref.type;
    var timeout = ref.timeout;
    var propCount = ref.propCount;
    if (!type) { return cb() }
    var event = type === TRANSITION ? transitionEndEvent : animationEndEvent;
    var ended = 0;
    var end = function () {
      el.removeEventListener(event, onEnd);
      cb();
    };
    var onEnd = function (e) {
      if (e.target === el) {
        if (++ended >= propCount) {
          end();
        }
      }
    };
    setTimeout(function () {
      if (ended < propCount) {
        end();
      }
    }, timeout + 1);
    el.addEventListener(event, onEnd);
  }
  
  var transformRE = /\b(transform|all)(,|$)/;
  
  function getTransitionInfo (el, expectedType) {
    var styles = window.getComputedStyle(el);
    var transitionDelays = styles[transitionProp + 'Delay'].split(', ');
    var transitionDurations = styles[transitionProp + 'Duration'].split(', ');
    var transitionTimeout = getTimeout(transitionDelays, transitionDurations);
    var animationDelays = styles[animationProp + 'Delay'].split(', ');
    var animationDurations = styles[animationProp + 'Duration'].split(', ');
    var animationTimeout = getTimeout(animationDelays, animationDurations);
  
    var type;
    var timeout = 0;
    var propCount = 0;
    /* istanbul ignore if */
    if (expectedType === TRANSITION) {
      if (transitionTimeout > 0) {
        type = TRANSITION;
        timeout = transitionTimeout;
        propCount = transitionDurations.length;
      }
    } else if (expectedType === ANIMATION) {
      if (animationTimeout > 0) {
        type = ANIMATION;
        timeout = animationTimeout;
        propCount = animationDurations.length;
      }
    } else {
      timeout = Math.max(transitionTimeout, animationTimeout);
      type = timeout > 0
        ? transitionTimeout > animationTimeout
          ? TRANSITION
          : ANIMATION
        : null;
      propCount = type
        ? type === TRANSITION
          ? transitionDurations.length
          : animationDurations.length
        : 0;
    }
    var hasTransform =
      type === TRANSITION &&
      transformRE.test(styles[transitionProp + 'Property']);
    return {
      type: type,
      timeout: timeout,
      propCount: propCount,
      hasTransform: hasTransform
    }
  }
  
  function getTimeout (delays, durations) {
    /* istanbul ignore next */
    while (delays.length < durations.length) {
      delays = delays.concat(delays);
    }
  
    return Math.max.apply(null, durations.map(function (d, i) {
      return toMs(d) + toMs(delays[i])
    }))
  }
  
  function toMs (s) {
    return Number(s.slice(0, -1)) * 1000
  }
  
  /*  */
  
  function enter (vnode, toggleDisplay) {
    var el = vnode.elm;
  
    // call leave callback now
    if (isDef(el._leaveCb)) {
      el._leaveCb.cancelled = true;
      el._leaveCb();
    }
  
    var data = resolveTransition(vnode.data.transition);
    if (isUndef(data)) {
      return
    }
  
    /* istanbul ignore if */
    if (isDef(el._enterCb) || el.nodeType !== 1) {
      return
    }
  
    var css = data.css;
    var type = data.type;
    var enterClass = data.enterClass;
    var enterToClass = data.enterToClass;
    var enterActiveClass = data.enterActiveClass;
    var appearClass = data.appearClass;
    var appearToClass = data.appearToClass;
    var appearActiveClass = data.appearActiveClass;
    var beforeEnter = data.beforeEnter;
    var enter = data.enter;
    var afterEnter = data.afterEnter;
    var enterCancelled = data.enterCancelled;
    var beforeAppear = data.beforeAppear;
    var appear = data.appear;
    var afterAppear = data.afterAppear;
    var appearCancelled = data.appearCancelled;
    var duration = data.duration;
  
    // activeInstance will always be the <transition> component managing this
    // transition. One edge case to check is when the <transition> is placed
    // as the root node of a child component. In that case we need to check
    // <transition>'s parent for appear check.
    var context = activeInstance;
    var transitionNode = activeInstance.$vnode;
    while (transitionNode && transitionNode.parent) {
      transitionNode = transitionNode.parent;
      context = transitionNode.context;
    }
  
    var isAppear = !context._isMounted || !vnode.isRootInsert;
  
    if (isAppear && !appear && appear !== '') {
      return
    }
  
    var startClass = isAppear && appearClass
      ? appearClass
      : enterClass;
    var activeClass = isAppear && appearActiveClass
      ? appearActiveClass
      : enterActiveClass;
    var toClass = isAppear && appearToClass
      ? appearToClass
      : enterToClass;
  
    var beforeEnterHook = isAppear
      ? (beforeAppear || beforeEnter)
      : beforeEnter;
    var enterHook = isAppear
      ? (typeof appear === 'function' ? appear : enter)
      : enter;
    var afterEnterHook = isAppear
      ? (afterAppear || afterEnter)
      : afterEnter;
    var enterCancelledHook = isAppear
      ? (appearCancelled || enterCancelled)
      : enterCancelled;
  
    var explicitEnterDuration = toNumber(
      isObject(duration)
        ? duration.enter
        : duration
    );
  
    if (process.env.NODE_ENV !== 'production' && explicitEnterDuration != null) {
      checkDuration(explicitEnterDuration, 'enter', vnode);
    }
  
    var expectsCSS = css !== false && !isIE9;
    var userWantsControl = getHookArgumentsLength(enterHook);
  
    var cb = el._enterCb = once(function () {
      if (expectsCSS) {
        removeTransitionClass(el, toClass);
        removeTransitionClass(el, activeClass);
      }
      if (cb.cancelled) {
        if (expectsCSS) {
          removeTransitionClass(el, startClass);
        }
        enterCancelledHook && enterCancelledHook(el);
      } else {
        afterEnterHook && afterEnterHook(el);
      }
      el._enterCb = null;
    });
  
    if (!vnode.data.show) {
      // remove pending leave element on enter by injecting an insert hook
      mergeVNodeHook(vnode, 'insert', function () {
        var parent = el.parentNode;
        var pendingNode = parent && parent._pending && parent._pending[vnode.key];
        if (pendingNode &&
          pendingNode.tag === vnode.tag &&
          pendingNode.elm._leaveCb
        ) {
          pendingNode.elm._leaveCb();
        }
        enterHook && enterHook(el, cb);
      });
    }
  
    // start enter transition
    beforeEnterHook && beforeEnterHook(el);
    if (expectsCSS) {
      addTransitionClass(el, startClass);
      addTransitionClass(el, activeClass);
      nextFrame(function () {
        addTransitionClass(el, toClass);
        removeTransitionClass(el, startClass);
        if (!cb.cancelled && !userWantsControl) {
          if (isValidDuration(explicitEnterDuration)) {
            setTimeout(cb, explicitEnterDuration);
          } else {
            whenTransitionEnds(el, type, cb);
          }
        }
      });
    }
  
    if (vnode.data.show) {
      toggleDisplay && toggleDisplay();
      enterHook && enterHook(el, cb);
    }
  
    if (!expectsCSS && !userWantsControl) {
      cb();
    }
  }
  
  function leave (vnode, rm) {
    var el = vnode.elm;
  
    // call enter callback now
    if (isDef(el._enterCb)) {
      el._enterCb.cancelled = true;
      el._enterCb();
    }
  
    var data = resolveTransition(vnode.data.transition);
    if (isUndef(data)) {
      return rm()
    }
  
    /* istanbul ignore if */
    if (isDef(el._leaveCb) || el.nodeType !== 1) {
      return
    }
  
    var css = data.css;
    var type = data.type;
    var leaveClass = data.leaveClass;
    var leaveToClass = data.leaveToClass;
    var leaveActiveClass = data.leaveActiveClass;
    var beforeLeave = data.beforeLeave;
    var leave = data.leave;
    var afterLeave = data.afterLeave;
    var leaveCancelled = data.leaveCancelled;
    var delayLeave = data.delayLeave;
    var duration = data.duration;
  
    var expectsCSS = css !== false && !isIE9;
    var userWantsControl = getHookArgumentsLength(leave);
  
    var explicitLeaveDuration = toNumber(
      isObject(duration)
        ? duration.leave
        : duration
    );
  
    if (process.env.NODE_ENV !== 'production' && isDef(explicitLeaveDuration)) {
      checkDuration(explicitLeaveDuration, 'leave', vnode);
    }
  
    var cb = el._leaveCb = once(function () {
      if (el.parentNode && el.parentNode._pending) {
        el.parentNode._pending[vnode.key] = null;
      }
      if (expectsCSS) {
        removeTransitionClass(el, leaveToClass);
        removeTransitionClass(el, leaveActiveClass);
      }
      if (cb.cancelled) {
        if (expectsCSS) {
          removeTransitionClass(el, leaveClass);
        }
        leaveCancelled && leaveCancelled(el);
      } else {
        rm();
        afterLeave && afterLeave(el);
      }
      el._leaveCb = null;
    });
  
    if (delayLeave) {
      delayLeave(performLeave);
    } else {
      performLeave();
    }
  
    function performLeave () {
      // the delayed leave may have already been cancelled
      if (cb.cancelled) {
        return
      }
      // record leaving element
      if (!vnode.data.show) {
        (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key)] = vnode;
      }
      beforeLeave && beforeLeave(el);
      if (expectsCSS) {
        addTransitionClass(el, leaveClass);
        addTransitionClass(el, leaveActiveClass);
        nextFrame(function () {
          addTransitionClass(el, leaveToClass);
          removeTransitionClass(el, leaveClass);
          if (!cb.cancelled && !userWantsControl) {
            if (isValidDuration(explicitLeaveDuration)) {
              setTimeout(cb, explicitLeaveDuration);
            } else {
              whenTransitionEnds(el, type, cb);
            }
          }
        });
      }
      leave && leave(el, cb);
      if (!expectsCSS && !userWantsControl) {
        cb();
      }
    }
  }
  
  // only used in dev mode
  function checkDuration (val, name, vnode) {
    if (typeof val !== 'number') {
      warn(
        "<transition> explicit " + name + " duration is not a valid number - " +
        "got " + (JSON.stringify(val)) + ".",
        vnode.context
      );
    } else if (isNaN(val)) {
      warn(
        "<transition> explicit " + name + " duration is NaN - " +
        'the duration expression might be incorrect.',
        vnode.context
      );
    }
  }
  
  function isValidDuration (val) {
    return typeof val === 'number' && !isNaN(val)
  }
  
  /**
   * Normalize a transition hook's argument length. The hook may be:
   * - a merged hook (invoker) with the original in .fns
   * - a wrapped component method (check ._length)
   * - a plain function (.length)
   */
  function getHookArgumentsLength (fn) {
    if (isUndef(fn)) {
      return false
    }
    var invokerFns = fn.fns;
    if (isDef(invokerFns)) {
      // invoker
      return getHookArgumentsLength(
        Array.isArray(invokerFns)
          ? invokerFns[0]
          : invokerFns
      )
    } else {
      return (fn._length || fn.length) > 1
    }
  }
  
  function _enter (_, vnode) {
    if (vnode.data.show !== true) {
      enter(vnode);
    }
  }
  
  var transition = inBrowser ? {
    create: _enter,
    activate: _enter,
    remove: function remove$$1 (vnode, rm) {
      /* istanbul ignore else */
      if (vnode.data.show !== true) {
        leave(vnode, rm);
      } else {
        rm();
      }
    }
  } : {};
  
  var platformModules = [
    attrs,
    klass,
    events,
    domProps,
    style,
    transition
  ];
  
  /*  */
  
  // the directive module should be applied last, after all
  // built-in modules have been applied.
  var modules = platformModules.concat(baseModules);
  
  var patch = createPatchFunction({ nodeOps: nodeOps, modules: modules });
  
  /**
   * Not type checking this file because flow doesn't like attaching
   * properties to Elements.
   */
  
  /* istanbul ignore if */
  if (isIE9) {
    // http://www.matts411.com/post/internet-explorer-9-oninput/
    document.addEventListener('selectionchange', function () {
      var el = document.activeElement;
      if (el && el.vmodel) {
        trigger(el, 'input');
      }
    });
  }
  
  var directive = {
    inserted: function inserted (el, binding, vnode, oldVnode) {
      if (vnode.tag === 'select') {
        // #6903
        if (oldVnode.elm && !oldVnode.elm._vOptions) {
          mergeVNodeHook(vnode, 'postpatch', function () {
            directive.componentUpdated(el, binding, vnode);
          });
        } else {
          setSelected(el, binding, vnode.context);
        }
        el._vOptions = [].map.call(el.options, getValue);
      } else if (vnode.tag === 'textarea' || isTextInputType(el.type)) {
        el._vModifiers = binding.modifiers;
        if (!binding.modifiers.lazy) {
          // Safari < 10.2 & UIWebView doesn't fire compositionend when
          // switching focus before confirming composition choice
          // this also fixes the issue where some browsers e.g. iOS Chrome
          // fires "change" instead of "input" on autocomplete.
          el.addEventListener('change', onCompositionEnd);
          if (!isAndroid) {
            el.addEventListener('compositionstart', onCompositionStart);
            el.addEventListener('compositionend', onCompositionEnd);
          }
          /* istanbul ignore if */
          if (isIE9) {
            el.vmodel = true;
          }
        }
      }
    },
  
    componentUpdated: function componentUpdated (el, binding, vnode) {
      if (vnode.tag === 'select') {
        setSelected(el, binding, vnode.context);
        // in case the options rendered by v-for have changed,
        // it's possible that the value is out-of-sync with the rendered options.
        // detect such cases and filter out values that no longer has a matching
        // option in the DOM.
        var prevOptions = el._vOptions;
        var curOptions = el._vOptions = [].map.call(el.options, getValue);
        if (curOptions.some(function (o, i) { return !looseEqual(o, prevOptions[i]); })) {
          // trigger change event if
          // no matching option found for at least one value
          var needReset = el.multiple
            ? binding.value.some(function (v) { return hasNoMatchingOption(v, curOptions); })
            : binding.value !== binding.oldValue && hasNoMatchingOption(binding.value, curOptions);
          if (needReset) {
            trigger(el, 'change');
          }
        }
      }
    }
  };
  
  function setSelected (el, binding, vm) {
    actuallySetSelected(el, binding, vm);
    /* istanbul ignore if */
    if (isIE || isEdge) {
      setTimeout(function () {
        actuallySetSelected(el, binding, vm);
      }, 0);
    }
  }
  
  function actuallySetSelected (el, binding, vm) {
    var value = binding.value;
    var isMultiple = el.multiple;
    if (isMultiple && !Array.isArray(value)) {
      process.env.NODE_ENV !== 'production' && warn(
        "<select multiple v-model=\"" + (binding.expression) + "\"> " +
        "expects an Array value for its binding, but got " + (Object.prototype.toString.call(value).slice(8, -1)),
        vm
      );
      return
    }
    var selected, option;
    for (var i = 0, l = el.options.length; i < l; i++) {
      option = el.options[i];
      if (isMultiple) {
        selected = looseIndexOf(value, getValue(option)) > -1;
        if (option.selected !== selected) {
          option.selected = selected;
        }
      } else {
        if (looseEqual(getValue(option), value)) {
          if (el.selectedIndex !== i) {
            el.selectedIndex = i;
          }
          return
        }
      }
    }
    if (!isMultiple) {
      el.selectedIndex = -1;
    }
  }
  
  function hasNoMatchingOption (value, options) {
    return options.every(function (o) { return !looseEqual(o, value); })
  }
  
  function getValue (option) {
    return '_value' in option
      ? option._value
      : option.value
  }
  
  function onCompositionStart (e) {
    e.target.composing = true;
  }
  
  function onCompositionEnd (e) {
    // prevent triggering an input event for no reason
    if (!e.target.composing) { return }
    e.target.composing = false;
    trigger(e.target, 'input');
  }
  
  function trigger (el, type) {
    var e = document.createEvent('HTMLEvents');
    e.initEvent(type, true, true);
    el.dispatchEvent(e);
  }
  
  /*  */
  
  // recursively search for possible transition defined inside the component root
  function locateNode (vnode) {
    return vnode.componentInstance && (!vnode.data || !vnode.data.transition)
      ? locateNode(vnode.componentInstance._vnode)
      : vnode
  }
  
  var show = {
    bind: function bind (el, ref, vnode) {
      var value = ref.value;
  
      vnode = locateNode(vnode);
      var transition$$1 = vnode.data && vnode.data.transition;
      var originalDisplay = el.__vOriginalDisplay =
        el.style.display === 'none' ? '' : el.style.display;
      if (value && transition$$1) {
        vnode.data.show = true;
        enter(vnode, function () {
          el.style.display = originalDisplay;
        });
      } else {
        el.style.display = value ? originalDisplay : 'none';
      }
    },
  
    update: function update (el, ref, vnode) {
      var value = ref.value;
      var oldValue = ref.oldValue;
  
      /* istanbul ignore if */
      if (value === oldValue) { return }
      vnode = locateNode(vnode);
      var transition$$1 = vnode.data && vnode.data.transition;
      if (transition$$1) {
        vnode.data.show = true;
        if (value) {
          enter(vnode, function () {
            el.style.display = el.__vOriginalDisplay;
          });
        } else {
          leave(vnode, function () {
            el.style.display = 'none';
          });
        }
      } else {
        el.style.display = value ? el.__vOriginalDisplay : 'none';
      }
    },
  
    unbind: function unbind (
      el,
      binding,
      vnode,
      oldVnode,
      isDestroy
    ) {
      if (!isDestroy) {
        el.style.display = el.__vOriginalDisplay;
      }
    }
  };
  
  var platformDirectives = {
    model: directive,
    show: show
  };
  
  /*  */
  
  // Provides transition support for a single element/component.
  // supports transition mode (out-in / in-out)
  
  var transitionProps = {
    name: String,
    appear: Boolean,
    css: Boolean,
    mode: String,
    type: String,
    enterClass: String,
    leaveClass: String,
    enterToClass: String,
    leaveToClass: String,
    enterActiveClass: String,
    leaveActiveClass: String,
    appearClass: String,
    appearActiveClass: String,
    appearToClass: String,
    duration: [Number, String, Object]
  };
  
  // in case the child is also an abstract component, e.g. <keep-alive>
  // we want to recursively retrieve the real component to be rendered
  function getRealChild (vnode) {
    var compOptions = vnode && vnode.componentOptions;
    if (compOptions && compOptions.Ctor.options.abstract) {
      return getRealChild(getFirstComponentChild(compOptions.children))
    } else {
      return vnode
    }
  }
  
  function extractTransitionData (comp) {
    var data = {};
    var options = comp.$options;
    // props
    for (var key in options.propsData) {
      data[key] = comp[key];
    }
    // events.
    // extract listeners and pass them directly to the transition methods
    var listeners = options._parentListeners;
    for (var key$1 in listeners) {
      data[camelize(key$1)] = listeners[key$1];
    }
    return data
  }
  
  function placeholder (h, rawChild) {
    if (/\d-keep-alive$/.test(rawChild.tag)) {
      return h('keep-alive', {
        props: rawChild.componentOptions.propsData
      })
    }
  }
  
  function hasParentTransition (vnode) {
    while ((vnode = vnode.parent)) {
      if (vnode.data.transition) {
        return true
      }
    }
  }
  
  function isSameChild (child, oldChild) {
    return oldChild.key === child.key && oldChild.tag === child.tag
  }
  
  var Transition = {
    name: 'transition',
    props: transitionProps,
    abstract: true,
  
    render: function render (h) {
      var this$1 = this;
  
      var children = this.$options._renderChildren;
      if (!children) {
        return
      }
  
      // filter out text nodes (possible whitespaces)
      children = children.filter(function (c) { return c.tag || isAsyncPlaceholder(c); });
      /* istanbul ignore if */
      if (!children.length) {
        return
      }
  
      // warn multiple elements
      if (process.env.NODE_ENV !== 'production' && children.length > 1) {
        warn(
          '<transition> can only be used on a single element. Use ' +
          '<transition-group> for lists.',
          this.$parent
        );
      }
  
      var mode = this.mode;
  
      // warn invalid mode
      if (process.env.NODE_ENV !== 'production' &&
        mode && mode !== 'in-out' && mode !== 'out-in'
      ) {
        warn(
          'invalid <transition> mode: ' + mode,
          this.$parent
        );
      }
  
      var rawChild = children[0];
  
      // if this is a component root node and the component's
      // parent container node also has transition, skip.
      if (hasParentTransition(this.$vnode)) {
        return rawChild
      }
  
      // apply transition data to child
      // use getRealChild() to ignore abstract components e.g. keep-alive
      var child = getRealChild(rawChild);
      /* istanbul ignore if */
      if (!child) {
        return rawChild
      }
  
      if (this._leaving) {
        return placeholder(h, rawChild)
      }
  
      // ensure a key that is unique to the vnode type and to this transition
      // component instance. This key will be used to remove pending leaving nodes
      // during entering.
      var id = "__transition-" + (this._uid) + "-";
      child.key = child.key == null
        ? child.isComment
          ? id + 'comment'
          : id + child.tag
        : isPrimitive(child.key)
          ? (String(child.key).indexOf(id) === 0 ? child.key : id + child.key)
          : child.key;
  
      var data = (child.data || (child.data = {})).transition = extractTransitionData(this);
      var oldRawChild = this._vnode;
      var oldChild = getRealChild(oldRawChild);
  
      // mark v-show
      // so that the transition module can hand over the control to the directive
      if (child.data.directives && child.data.directives.some(function (d) { return d.name === 'show'; })) {
        child.data.show = true;
      }
  
      if (
        oldChild &&
        oldChild.data &&
        !isSameChild(child, oldChild) &&
        !isAsyncPlaceholder(oldChild)
      ) {
        // replace old child transition data with fresh one
        // important for dynamic transitions!
        var oldData = oldChild.data.transition = extend({}, data);
        // handle transition mode
        if (mode === 'out-in') {
          // return placeholder node and queue update when leave finishes
          this._leaving = true;
          mergeVNodeHook(oldData, 'afterLeave', function () {
            this$1._leaving = false;
            this$1.$forceUpdate();
          });
          return placeholder(h, rawChild)
        } else if (mode === 'in-out') {
          if (isAsyncPlaceholder(child)) {
            return oldRawChild
          }
          var delayedLeave;
          var performLeave = function () { delayedLeave(); };
          mergeVNodeHook(data, 'afterEnter', performLeave);
          mergeVNodeHook(data, 'enterCancelled', performLeave);
          mergeVNodeHook(oldData, 'delayLeave', function (leave) { delayedLeave = leave; });
        }
      }
  
      return rawChild
    }
  };
  
  /*  */
  
  // Provides transition support for list items.
  // supports move transitions using the FLIP technique.
  
  // Because the vdom's children update algorithm is "unstable" - i.e.
  // it doesn't guarantee the relative positioning of removed elements,
  // we force transition-group to update its children into two passes:
  // in the first pass, we remove all nodes that need to be removed,
  // triggering their leaving transition; in the second pass, we insert/move
  // into the final desired state. This way in the second pass removed
  // nodes will remain where they should be.
  
  var props = extend({
    tag: String,
    moveClass: String
  }, transitionProps);
  
  delete props.mode;
  
  var TransitionGroup = {
    props: props,
  
    render: function render (h) {
      var tag = this.tag || this.$vnode.data.tag || 'span';
      var map = Object.create(null);
      var prevChildren = this.prevChildren = this.children;
      var rawChildren = this.$slots.default || [];
      var children = this.children = [];
      var transitionData = extractTransitionData(this);
  
      for (var i = 0; i < rawChildren.length; i++) {
        var c = rawChildren[i];
        if (c.tag) {
          if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {
            children.push(c);
            map[c.key] = c
            ;(c.data || (c.data = {})).transition = transitionData;
          } else if (process.env.NODE_ENV !== 'production') {
            var opts = c.componentOptions;
            var name = opts ? (opts.Ctor.options.name || opts.tag || '') : c.tag;
            warn(("<transition-group> children must be keyed: <" + name + ">"));
          }
        }
      }
  
      if (prevChildren) {
        var kept = [];
        var removed = [];
        for (var i$1 = 0; i$1 < prevChildren.length; i$1++) {
          var c$1 = prevChildren[i$1];
          c$1.data.transition = transitionData;
          c$1.data.pos = c$1.elm.getBoundingClientRect();
          if (map[c$1.key]) {
            kept.push(c$1);
          } else {
            removed.push(c$1);
          }
        }
        this.kept = h(tag, null, kept);
        this.removed = removed;
      }
  
      return h(tag, null, children)
    },
  
    beforeUpdate: function beforeUpdate () {
      // force removing pass
      this.__patch__(
        this._vnode,
        this.kept,
        false, // hydrating
        true // removeOnly (!important, avoids unnecessary moves)
      );
      this._vnode = this.kept;
    },
  
    updated: function updated () {
      var children = this.prevChildren;
      var moveClass = this.moveClass || ((this.name || 'v') + '-move');
      if (!children.length || !this.hasMove(children[0].elm, moveClass)) {
        return
      }
  
      // we divide the work into three loops to avoid mixing DOM reads and writes
      // in each iteration - which helps prevent layout thrashing.
      children.forEach(callPendingCbs);
      children.forEach(recordPosition);
      children.forEach(applyTranslation);
  
      // force reflow to put everything in position
      // assign to this to avoid being removed in tree-shaking
      // $flow-disable-line
      this._reflow = document.body.offsetHeight;
  
      children.forEach(function (c) {
        if (c.data.moved) {
          var el = c.elm;
          var s = el.style;
          addTransitionClass(el, moveClass);
          s.transform = s.WebkitTransform = s.transitionDuration = '';
          el.addEventListener(transitionEndEvent, el._moveCb = function cb (e) {
            if (!e || /transform$/.test(e.propertyName)) {
              el.removeEventListener(transitionEndEvent, cb);
              el._moveCb = null;
              removeTransitionClass(el, moveClass);
            }
          });
        }
      });
    },
  
    methods: {
      hasMove: function hasMove (el, moveClass) {
        /* istanbul ignore if */
        if (!hasTransition) {
          return false
        }
        /* istanbul ignore if */
        if (this._hasMove) {
          return this._hasMove
        }
        // Detect whether an element with the move class applied has
        // CSS transitions. Since the element may be inside an entering
        // transition at this very moment, we make a clone of it and remove
        // all other transition classes applied to ensure only the move class
        // is applied.
        var clone = el.cloneNode();
        if (el._transitionClasses) {
          el._transitionClasses.forEach(function (cls) { removeClass(clone, cls); });
        }
        addClass(clone, moveClass);
        clone.style.display = 'none';
        this.$el.appendChild(clone);
        var info = getTransitionInfo(clone);
        this.$el.removeChild(clone);
        return (this._hasMove = info.hasTransform)
      }
    }
  };
  
  function callPendingCbs (c) {
    /* istanbul ignore if */
    if (c.elm._moveCb) {
      c.elm._moveCb();
    }
    /* istanbul ignore if */
    if (c.elm._enterCb) {
      c.elm._enterCb();
    }
  }
  
  function recordPosition (c) {
    c.data.newPos = c.elm.getBoundingClientRect();
  }
  
  function applyTranslation (c) {
    var oldPos = c.data.pos;
    var newPos = c.data.newPos;
    var dx = oldPos.left - newPos.left;
    var dy = oldPos.top - newPos.top;
    if (dx || dy) {
      c.data.moved = true;
      var s = c.elm.style;
      s.transform = s.WebkitTransform = "translate(" + dx + "px," + dy + "px)";
      s.transitionDuration = '0s';
    }
  }
  
  var platformComponents = {
    Transition: Transition,
    TransitionGroup: TransitionGroup
  };
  
  /*  */
  
  // install platform specific utils
  Vue$3.config.mustUseProp = mustUseProp;
  Vue$3.config.isReservedTag = isReservedTag;
  Vue$3.config.isReservedAttr = isReservedAttr;
  Vue$3.config.getTagNamespace = getTagNamespace;
  Vue$3.config.isUnknownElement = isUnknownElement;
  
  // install platform runtime directives & components
  extend(Vue$3.options.directives, platformDirectives);
  extend(Vue$3.options.components, platformComponents);
  
  // install platform patch function
  Vue$3.prototype.__patch__ = inBrowser ? patch : noop;
  
  // public mount method
  Vue$3.prototype.$mount = function (
    el,
    hydrating
  ) {
    el = el && inBrowser ? query(el) : undefined;
    return mountComponent(this, el, hydrating)
  };
  
  // devtools global hook
  /* istanbul ignore next */
  Vue$3.nextTick(function () {
    if (config.devtools) {
      if (devtools) {
        devtools.emit('init', Vue$3);
      } else if (process.env.NODE_ENV !== 'production' && isChrome) {
        console[console.info ? 'info' : 'log'](
          'Download the Vue Devtools extension for a better development experience:\n' +
          'https://github.com/vuejs/vue-devtools'
        );
      }
    }
    if (process.env.NODE_ENV !== 'production' &&
      config.productionTip !== false &&
      inBrowser && typeof console !== 'undefined'
    ) {
      console[console.info ? 'info' : 'log'](
        "You are running Vue in development mode.\n" +
        "Make sure to turn on production mode when deploying for production.\n" +
        "See more tips at https://vuejs.org/guide/deployment.html"
      );
    }
  }, 0);
  
  /*  */
  
  var defaultTagRE = /\{\{((?:.|\n)+?)\}\}/g;
  var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;
  
  var buildRegex = cached(function (delimiters) {
    var open = delimiters[0].replace(regexEscapeRE, '\\$&');
    var close = delimiters[1].replace(regexEscapeRE, '\\$&');
    return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
  });
  
  function parseText (
    text,
    delimiters
  ) {
    var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;
    if (!tagRE.test(text)) {
      return
    }
    var tokens = [];
    var lastIndex = tagRE.lastIndex = 0;
    var match, index;
    while ((match = tagRE.exec(text))) {
      index = match.index;
      // push text token
      if (index > lastIndex) {
        tokens.push(JSON.stringify(text.slice(lastIndex, index)));
      }
      // tag token
      var exp = parseFilters(match[1].trim());
      tokens.push(("_s(" + exp + ")"));
      lastIndex = index + match[0].length;
    }
    if (lastIndex < text.length) {
      tokens.push(JSON.stringify(text.slice(lastIndex)));
    }
    return tokens.join('+')
  }
  
  /*  */
  
  function transformNode (el, options) {
    var warn = options.warn || baseWarn;
    var staticClass = getAndRemoveAttr(el, 'class');
    if (process.env.NODE_ENV !== 'production' && staticClass) {
      var expression = parseText(staticClass, options.delimiters);
      if (expression) {
        warn(
          "class=\"" + staticClass + "\": " +
          'Interpolation inside attributes has been removed. ' +
          'Use v-bind or the colon shorthand instead. For example, ' +
          'instead of <div class="{{ val }}">, use <div :class="val">.'
        );
      }
    }
    if (staticClass) {
      el.staticClass = JSON.stringify(staticClass);
    }
    var classBinding = getBindingAttr(el, 'class', false /* getStatic */);
    if (classBinding) {
      el.classBinding = classBinding;
    }
  }
  
  function genData (el) {
    var data = '';
    if (el.staticClass) {
      data += "staticClass:" + (el.staticClass) + ",";
    }
    if (el.classBinding) {
      data += "class:" + (el.classBinding) + ",";
    }
    return data
  }
  
  var klass$1 = {
    staticKeys: ['staticClass'],
    transformNode: transformNode,
    genData: genData
  };
  
  /*  */
  
  function transformNode$1 (el, options) {
    var warn = options.warn || baseWarn;
    var staticStyle = getAndRemoveAttr(el, 'style');
    if (staticStyle) {
      /* istanbul ignore if */
      if (process.env.NODE_ENV !== 'production') {
        var expression = parseText(staticStyle, options.delimiters);
        if (expression) {
          warn(
            "style=\"" + staticStyle + "\": " +
            'Interpolation inside attributes has been removed. ' +
            'Use v-bind or the colon shorthand instead. For example, ' +
            'instead of <div style="{{ val }}">, use <div :style="val">.'
          );
        }
      }
      el.staticStyle = JSON.stringify(parseStyleText(staticStyle));
    }
  
    var styleBinding = getBindingAttr(el, 'style', false /* getStatic */);
    if (styleBinding) {
      el.styleBinding = styleBinding;
    }
  }
  
  function genData$1 (el) {
    var data = '';
    if (el.staticStyle) {
      data += "staticStyle:" + (el.staticStyle) + ",";
    }
    if (el.styleBinding) {
      data += "style:(" + (el.styleBinding) + "),";
    }
    return data
  }
  
  var style$1 = {
    staticKeys: ['staticStyle'],
    transformNode: transformNode$1,
    genData: genData$1
  };
  
  /*  */
  
  var decoder;
  
  var he = {
    decode: function decode (html) {
      decoder = decoder || document.createElement('div');
      decoder.innerHTML = html;
      return decoder.textContent
    }
  };
  
  /*  */
  
  var isUnaryTag = makeMap(
    'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +
    'link,meta,param,source,track,wbr'
  );
  
  // Elements that you can, intentionally, leave open
  // (and which close themselves)
  var canBeLeftOpenTag = makeMap(
    'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source'
  );
  
  // HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
  // Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
  var isNonPhrasingTag = makeMap(
    'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
    'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
    'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
    'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
    'title,tr,track'
  );
  
  /**
   * Not type-checking this file because it's mostly vendor code.
   */
  
  /*!
   * HTML Parser By John Resig (ejohn.org)
   * Modified by Juriy "kangax" Zaytsev
   * Original code by Erik Arvidsson, Mozilla Public License
   * http://erik.eae.net/simplehtmlparser/simplehtmlparser.js
   */
  
  // Regular Expressions for parsing tags and attributes
  var attribute = /^\s*([^\s"'<>\/=]+)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
  // could use https://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-QName
  // but for Vue templates we can enforce a simple charset
  var ncname = '[a-zA-Z_][\\w\\-\\.]*';
  var qnameCapture = "((?:" + ncname + "\\:)?" + ncname + ")";
  var startTagOpen = new RegExp(("^<" + qnameCapture));
  var startTagClose = /^\s*(\/?)>/;
  var endTag = new RegExp(("^<\\/" + qnameCapture + "[^>]*>"));
  var doctype = /^<!DOCTYPE [^>]+>/i;
  var comment = /^<!--/;
  var conditionalComment = /^<!\[/;
  
  var IS_REGEX_CAPTURING_BROKEN = false;
  'x'.replace(/x(.)?/g, function (m, g) {
    IS_REGEX_CAPTURING_BROKEN = g === '';
  });
  
  // Special Elements (can contain anything)
  var isPlainTextElement = makeMap('script,style,textarea', true);
  var reCache = {};
  
  var decodingMap = {
    '&lt;': '<',
    '&gt;': '>',
    '&quot;': '"',
    '&amp;': '&',
    '&#10;': '\n',
    '&#9;': '\t'
  };
  var encodedAttr = /&(?:lt|gt|quot|amp);/g;
  var encodedAttrWithNewLines = /&(?:lt|gt|quot|amp|#10|#9);/g;
  
  // #5992
  var isIgnoreNewlineTag = makeMap('pre,textarea', true);
  var shouldIgnoreFirstNewline = function (tag, html) { return tag && isIgnoreNewlineTag(tag) && html[0] === '\n'; };
  
  function decodeAttr (value, shouldDecodeNewlines) {
    var re = shouldDecodeNewlines ? encodedAttrWithNewLines : encodedAttr;
    return value.replace(re, function (match) { return decodingMap[match]; })
  }
  
  function parseHTML (html, options) {
    var stack = [];
    var expectHTML = options.expectHTML;
    var isUnaryTag$$1 = options.isUnaryTag || no;
    var canBeLeftOpenTag$$1 = options.canBeLeftOpenTag || no;
    var index = 0;
    var last, lastTag;
    while (html) {
      last = html;
      // Make sure we're not in a plaintext content element like script/style
      if (!lastTag || !isPlainTextElement(lastTag)) {
        var textEnd = html.indexOf('<');
        if (textEnd === 0) {
          // Comment:
          if (comment.test(html)) {
            var commentEnd = html.indexOf('-->');
  
            if (commentEnd >= 0) {
              if (options.shouldKeepComment) {
                options.comment(html.substring(4, commentEnd));
              }
              advance(commentEnd + 3);
              continue
            }
          }
  
          // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
          if (conditionalComment.test(html)) {
            var conditionalEnd = html.indexOf(']>');
  
            if (conditionalEnd >= 0) {
              advance(conditionalEnd + 2);
              continue
            }
          }
  
          // Doctype:
          var doctypeMatch = html.match(doctype);
          if (doctypeMatch) {
            advance(doctypeMatch[0].length);
            continue
          }
  
          // End tag:
          var endTagMatch = html.match(endTag);
          if (endTagMatch) {
            var curIndex = index;
            advance(endTagMatch[0].length);
            parseEndTag(endTagMatch[1], curIndex, index);
            continue
          }
  
          // Start tag:
          var startTagMatch = parseStartTag();
          if (startTagMatch) {
            handleStartTag(startTagMatch);
            if (shouldIgnoreFirstNewline(lastTag, html)) {
              advance(1);
            }
            continue
          }
        }
  
        var text = (void 0), rest = (void 0), next = (void 0);
        if (textEnd >= 0) {
          rest = html.slice(textEnd);
          while (
            !endTag.test(rest) &&
            !startTagOpen.test(rest) &&
            !comment.test(rest) &&
            !conditionalComment.test(rest)
          ) {
            // < in plain text, be forgiving and treat it as text
            next = rest.indexOf('<', 1);
            if (next < 0) { break }
            textEnd += next;
            rest = html.slice(textEnd);
          }
          text = html.substring(0, textEnd);
          advance(textEnd);
        }
  
        if (textEnd < 0) {
          text = html;
          html = '';
        }
  
        if (options.chars && text) {
          options.chars(text);
        }
      } else {
        var endTagLength = 0;
        var stackedTag = lastTag.toLowerCase();
        var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'));
        var rest$1 = html.replace(reStackedTag, function (all, text, endTag) {
          endTagLength = endTag.length;
          if (!isPlainTextElement(stackedTag) && stackedTag !== 'noscript') {
            text = text
              .replace(/<!--([\s\S]*?)-->/g, '$1')
              .replace(/<!\[CDATA\[([\s\S]*?)]]>/g, '$1');
          }
          if (shouldIgnoreFirstNewline(stackedTag, text)) {
            text = text.slice(1);
          }
          if (options.chars) {
            options.chars(text);
          }
          return ''
        });
        index += html.length - rest$1.length;
        html = rest$1;
        parseEndTag(stackedTag, index - endTagLength, index);
      }
  
      if (html === last) {
        options.chars && options.chars(html);
        if (process.env.NODE_ENV !== 'production' && !stack.length && options.warn) {
          options.warn(("Mal-formatted tag at end of template: \"" + html + "\""));
        }
        break
      }
    }
  
    // Clean up any remaining tags
    parseEndTag();
  
    function advance (n) {
      index += n;
      html = html.substring(n);
    }
  
    function parseStartTag () {
      var start = html.match(startTagOpen);
      if (start) {
        var match = {
          tagName: start[1],
          attrs: [],
          start: index
        };
        advance(start[0].length);
        var end, attr;
        while (!(end = html.match(startTagClose)) && (attr = html.match(attribute))) {
          advance(attr[0].length);
          match.attrs.push(attr);
        }
        if (end) {
          match.unarySlash = end[1];
          advance(end[0].length);
          match.end = index;
          return match
        }
      }
    }
  
    function handleStartTag (match) {
      var tagName = match.tagName;
      var unarySlash = match.unarySlash;
  
      if (expectHTML) {
        if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
          parseEndTag(lastTag);
        }
        if (canBeLeftOpenTag$$1(tagName) && lastTag === tagName) {
          parseEndTag(tagName);
        }
      }
  
      var unary = isUnaryTag$$1(tagName) || !!unarySlash;
  
      var l = match.attrs.length;
      var attrs = new Array(l);
      for (var i = 0; i < l; i++) {
        var args = match.attrs[i];
        // hackish work around FF bug https://bugzilla.mozilla.org/show_bug.cgi?id=369778
        if (IS_REGEX_CAPTURING_BROKEN && args[0].indexOf('""') === -1) {
          if (args[3] === '') { delete args[3]; }
          if (args[4] === '') { delete args[4]; }
          if (args[5] === '') { delete args[5]; }
        }
        var value = args[3] || args[4] || args[5] || '';
        var shouldDecodeNewlines = tagName === 'a' && args[1] === 'href'
          ? options.shouldDecodeNewlinesForHref
          : options.shouldDecodeNewlines;
        attrs[i] = {
          name: args[1],
          value: decodeAttr(value, shouldDecodeNewlines)
        };
      }
  
      if (!unary) {
        stack.push({ tag: tagName, lowerCasedTag: tagName.toLowerCase(), attrs: attrs });
        lastTag = tagName;
      }
  
      if (options.start) {
        options.start(tagName, attrs, unary, match.start, match.end);
      }
    }
  
    function parseEndTag (tagName, start, end) {
      var pos, lowerCasedTagName;
      if (start == null) { start = index; }
      if (end == null) { end = index; }
  
      if (tagName) {
        lowerCasedTagName = tagName.toLowerCase();
      }
  
      // Find the closest opened tag of the same type
      if (tagName) {
        for (pos = stack.length - 1; pos >= 0; pos--) {
          if (stack[pos].lowerCasedTag === lowerCasedTagName) {
            break
          }
        }
      } else {
        // If no tag name is provided, clean shop
        pos = 0;
      }
  
      if (pos >= 0) {
        // Close all the open elements, up the stack
        for (var i = stack.length - 1; i >= pos; i--) {
          if (process.env.NODE_ENV !== 'production' &&
            (i > pos || !tagName) &&
            options.warn
          ) {
            options.warn(
              ("tag <" + (stack[i].tag) + "> has no matching end tag.")
            );
          }
          if (options.end) {
            options.end(stack[i].tag, start, end);
          }
        }
  
        // Remove the open elements from the stack
        stack.length = pos;
        lastTag = pos && stack[pos - 1].tag;
      } else if (lowerCasedTagName === 'br') {
        if (options.start) {
          options.start(tagName, [], true, start, end);
        }
      } else if (lowerCasedTagName === 'p') {
        if (options.start) {
          options.start(tagName, [], false, start, end);
        }
        if (options.end) {
          options.end(tagName, start, end);
        }
      }
    }
  }
  
  /*  */
  
  var onRE = /^@|^v-on:/;
  var dirRE = /^v-|^@|^:/;
  var forAliasRE = /(.*?)\s+(?:in|of)\s+(.*)/;
  var forIteratorRE = /\((\{[^}]*\}|[^,]*),([^,]*)(?:,([^,]*))?\)/;
  
  var argRE = /:(.*)$/;
  var bindRE = /^:|^v-bind:/;
  var modifierRE = /\.[^.]+/g;
  
  var decodeHTMLCached = cached(he.decode);
  
  // configurable state
  var warn$2;
  var delimiters;
  var transforms;
  var preTransforms;
  var postTransforms;
  var platformIsPreTag;
  var platformMustUseProp;
  var platformGetTagNamespace;
  
  
  
  function createASTElement (
    tag,
    attrs,
    parent
  ) {
    return {
      type: 1,
      tag: tag,
      attrsList: attrs,
      attrsMap: makeAttrsMap(attrs),
      parent: parent,
      children: []
    }
  }
  
  /**
   * Convert HTML string to AST.
   */
  function parse (
    template,
    options
  ) {
    warn$2 = options.warn || baseWarn;
  
    platformIsPreTag = options.isPreTag || no;
    platformMustUseProp = options.mustUseProp || no;
    platformGetTagNamespace = options.getTagNamespace || no;
  
    transforms = pluckModuleFunction(options.modules, 'transformNode');
    preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');
    postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');
  
    delimiters = options.delimiters;
  
    var stack = [];
    var preserveWhitespace = options.preserveWhitespace !== false;
    var root;
    var currentParent;
    var inVPre = false;
    var inPre = false;
    var warned = false;
  
    function warnOnce (msg) {
      if (!warned) {
        warned = true;
        warn$2(msg);
      }
    }
  
    function endPre (element) {
      // check pre state
      if (element.pre) {
        inVPre = false;
      }
      if (platformIsPreTag(element.tag)) {
        inPre = false;
      }
    }
  
    parseHTML(template, {
      warn: warn$2,
      expectHTML: options.expectHTML,
      isUnaryTag: options.isUnaryTag,
      canBeLeftOpenTag: options.canBeLeftOpenTag,
      shouldDecodeNewlines: options.shouldDecodeNewlines,
      shouldDecodeNewlinesForHref: options.shouldDecodeNewlinesForHref,
      shouldKeepComment: options.comments,
      start: function start (tag, attrs, unary) {
        // check namespace.
        // inherit parent ns if there is one
        var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);
  
        // handle IE svg bug
        /* istanbul ignore if */
        if (isIE && ns === 'svg') {
          attrs = guardIESVGBug(attrs);
        }
  
        var element = createASTElement(tag, attrs, currentParent);
        if (ns) {
          element.ns = ns;
        }
  
        if (isForbiddenTag(element) && !isServerRendering()) {
          element.forbidden = true;
          process.env.NODE_ENV !== 'production' && warn$2(
            'Templates should only be responsible for mapping the state to the ' +
            'UI. Avoid placing tags with side-effects in your templates, such as ' +
            "<" + tag + ">" + ', as they will not be parsed.'
          );
        }
  
        // apply pre-transforms
        for (var i = 0; i < preTransforms.length; i++) {
          element = preTransforms[i](element, options) || element;
        }
  
        if (!inVPre) {
          processPre(element);
          if (element.pre) {
            inVPre = true;
          }
        }
        if (platformIsPreTag(element.tag)) {
          inPre = true;
        }
        if (inVPre) {
          processRawAttrs(element);
        } else if (!element.processed) {
          // structural directives
          processFor(element);
          processIf(element);
          processOnce(element);
          // element-scope stuff
          processElement(element, options);
        }
  
        function checkRootConstraints (el) {
          if (process.env.NODE_ENV !== 'production') {
            if (el.tag === 'slot' || el.tag === 'template') {
              warnOnce(
                "Cannot use <" + (el.tag) + "> as component root element because it may " +
                'contain multiple nodes.'
              );
            }
            if (el.attrsMap.hasOwnProperty('v-for')) {
              warnOnce(
                'Cannot use v-for on stateful component root element because ' +
                'it renders multiple elements.'
              );
            }
          }
        }
  
        // tree management
        if (!root) {
          root = element;
          checkRootConstraints(root);
        } else if (!stack.length) {
          // allow root elements with v-if, v-else-if and v-else
          if (root.if && (element.elseif || element.else)) {
            checkRootConstraints(element);
            addIfCondition(root, {
              exp: element.elseif,
              block: element
            });
          } else if (process.env.NODE_ENV !== 'production') {
            warnOnce(
              "Component template should contain exactly one root element. " +
              "If you are using v-if on multiple elements, " +
              "use v-else-if to chain them instead."
            );
          }
        }
        if (currentParent && !element.forbidden) {
          if (element.elseif || element.else) {
            processIfConditions(element, currentParent);
          } else if (element.slotScope) { // scoped slot
            currentParent.plain = false;
            var name = element.slotTarget || '"default"';(currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;
          } else {
            currentParent.children.push(element);
            element.parent = currentParent;
          }
        }
        if (!unary) {
          currentParent = element;
          stack.push(element);
        } else {
          endPre(element);
        }
        // apply post-transforms
        for (var i$1 = 0; i$1 < postTransforms.length; i$1++) {
          postTransforms[i$1](element, options);
        }
      },
  
      end: function end () {
        // remove trailing whitespace
        var element = stack[stack.length - 1];
        var lastNode = element.children[element.children.length - 1];
        if (lastNode && lastNode.type === 3 && lastNode.text === ' ' && !inPre) {
          element.children.pop();
        }
        // pop stack
        stack.length -= 1;
        currentParent = stack[stack.length - 1];
        endPre(element);
      },
  
      chars: function chars (text) {
        if (!currentParent) {
          if (process.env.NODE_ENV !== 'production') {
            if (text === template) {
              warnOnce(
                'Component template requires a root element, rather than just text.'
              );
            } else if ((text = text.trim())) {
              warnOnce(
                ("text \"" + text + "\" outside root element will be ignored.")
              );
            }
          }
          return
        }
        // IE textarea placeholder bug
        /* istanbul ignore if */
        if (isIE &&
          currentParent.tag === 'textarea' &&
          currentParent.attrsMap.placeholder === text
        ) {
          return
        }
        var children = currentParent.children;
        text = inPre || text.trim()
          ? isTextTag(currentParent) ? text : decodeHTMLCached(text)
          // only preserve whitespace if its not right after a starting tag
          : preserveWhitespace && children.length ? ' ' : '';
        if (text) {
          var expression;
          if (!inVPre && text !== ' ' && (expression = parseText(text, delimiters))) {
            children.push({
              type: 2,
              expression: expression,
              text: text
            });
          } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
            children.push({
              type: 3,
              text: text
            });
          }
        }
      },
      comment: function comment (text) {
        currentParent.children.push({
          type: 3,
          text: text,
          isComment: true
        });
      }
    });
    return root
  }
  
  function processPre (el) {
    if (getAndRemoveAttr(el, 'v-pre') != null) {
      el.pre = true;
    }
  }
  
  function processRawAttrs (el) {
    var l = el.attrsList.length;
    if (l) {
      var attrs = el.attrs = new Array(l);
      for (var i = 0; i < l; i++) {
        attrs[i] = {
          name: el.attrsList[i].name,
          value: JSON.stringify(el.attrsList[i].value)
        };
      }
    } else if (!el.pre) {
      // non root node in pre blocks with no attributes
      el.plain = true;
    }
  }
  
  function processElement (element, options) {
    processKey(element);
  
    // determine whether this is a plain element after
    // removing structural attributes
    element.plain = !element.key && !element.attrsList.length;
  
    processRef(element);
    processSlot(element);
    processComponent(element);
    for (var i = 0; i < transforms.length; i++) {
      element = transforms[i](element, options) || element;
    }
    processAttrs(element);
  }
  
  function processKey (el) {
    var exp = getBindingAttr(el, 'key');
    if (exp) {
      if (process.env.NODE_ENV !== 'production' && el.tag === 'template') {
        warn$2("<template> cannot be keyed. Place the key on real elements instead.");
      }
      el.key = exp;
    }
  }
  
  function processRef (el) {
    var ref = getBindingAttr(el, 'ref');
    if (ref) {
      el.ref = ref;
      el.refInFor = checkInFor(el);
    }
  }
  
  function processFor (el) {
    var exp;
    if ((exp = getAndRemoveAttr(el, 'v-for'))) {
      var inMatch = exp.match(forAliasRE);
      if (!inMatch) {
        process.env.NODE_ENV !== 'production' && warn$2(
          ("Invalid v-for expression: " + exp)
        );
        return
      }
      el.for = inMatch[2].trim();
      var alias = inMatch[1].trim();
      var iteratorMatch = alias.match(forIteratorRE);
      if (iteratorMatch) {
        el.alias = iteratorMatch[1].trim();
        el.iterator1 = iteratorMatch[2].trim();
        if (iteratorMatch[3]) {
          el.iterator2 = iteratorMatch[3].trim();
        }
      } else {
        el.alias = alias;
      }
    }
  }
  
  function processIf (el) {
    var exp = getAndRemoveAttr(el, 'v-if');
    if (exp) {
      el.if = exp;
      addIfCondition(el, {
        exp: exp,
        block: el
      });
    } else {
      if (getAndRemoveAttr(el, 'v-else') != null) {
        el.else = true;
      }
      var elseif = getAndRemoveAttr(el, 'v-else-if');
      if (elseif) {
        el.elseif = elseif;
      }
    }
  }
  
  function processIfConditions (el, parent) {
    var prev = findPrevElement(parent.children);
    if (prev && prev.if) {
      addIfCondition(prev, {
        exp: el.elseif,
        block: el
      });
    } else if (process.env.NODE_ENV !== 'production') {
      warn$2(
        "v-" + (el.elseif ? ('else-if="' + el.elseif + '"') : 'else') + " " +
        "used on element <" + (el.tag) + "> without corresponding v-if."
      );
    }
  }
  
  function findPrevElement (children) {
    var i = children.length;
    while (i--) {
      if (children[i].type === 1) {
        return children[i]
      } else {
        if (process.env.NODE_ENV !== 'production' && children[i].text !== ' ') {
          warn$2(
            "text \"" + (children[i].text.trim()) + "\" between v-if and v-else(-if) " +
            "will be ignored."
          );
        }
        children.pop();
      }
    }
  }
  
  function addIfCondition (el, condition) {
    if (!el.ifConditions) {
      el.ifConditions = [];
    }
    el.ifConditions.push(condition);
  }
  
  function processOnce (el) {
    var once$$1 = getAndRemoveAttr(el, 'v-once');
    if (once$$1 != null) {
      el.once = true;
    }
  }
  
  function processSlot (el) {
    if (el.tag === 'slot') {
      el.slotName = getBindingAttr(el, 'name');
      if (process.env.NODE_ENV !== 'production' && el.key) {
        warn$2(
          "`key` does not work on <slot> because slots are abstract outlets " +
          "and can possibly expand into multiple elements. " +
          "Use the key on a wrapping element instead."
        );
      }
    } else {
      var slotScope;
      if (el.tag === 'template') {
        slotScope = getAndRemoveAttr(el, 'scope');
        /* istanbul ignore if */
        if (process.env.NODE_ENV !== 'production' && slotScope) {
          warn$2(
            "the \"scope\" attribute for scoped slots have been deprecated and " +
            "replaced by \"slot-scope\" since 2.5. The new \"slot-scope\" attribute " +
            "can also be used on plain elements in addition to <template> to " +
            "denote scoped slots.",
            true
          );
        }
        el.slotScope = slotScope || getAndRemoveAttr(el, 'slot-scope');
      } else if ((slotScope = getAndRemoveAttr(el, 'slot-scope'))) {
        el.slotScope = slotScope;
      }
      var slotTarget = getBindingAttr(el, 'slot');
      if (slotTarget) {
        el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
        // preserve slot as an attribute for native shadow DOM compat
        // only for non-scoped slots.
        if (el.tag !== 'template' && !el.slotScope) {
          addAttr(el, 'slot', slotTarget);
        }
      }
    }
  }
  
  function processComponent (el) {
    var binding;
    if ((binding = getBindingAttr(el, 'is'))) {
      el.component = binding;
    }
    if (getAndRemoveAttr(el, 'inline-template') != null) {
      el.inlineTemplate = true;
    }
  }
  
  function processAttrs (el) {
    var list = el.attrsList;
    var i, l, name, rawName, value, modifiers, isProp;
    for (i = 0, l = list.length; i < l; i++) {
      name = rawName = list[i].name;
      value = list[i].value;
      if (dirRE.test(name)) {
        // mark element as dynamic
        el.hasBindings = true;
        // modifiers
        modifiers = parseModifiers(name);
        if (modifiers) {
          name = name.replace(modifierRE, '');
        }
        if (bindRE.test(name)) { // v-bind
          name = name.replace(bindRE, '');
          value = parseFilters(value);
          isProp = false;
          if (modifiers) {
            if (modifiers.prop) {
              isProp = true;
              name = camelize(name);
              if (name === 'innerHtml') { name = 'innerHTML'; }
            }
            if (modifiers.camel) {
              name = camelize(name);
            }
            if (modifiers.sync) {
              addHandler(
                el,
                ("update:" + (camelize(name))),
                genAssignmentCode(value, "$event")
              );
            }
          }
          if (isProp || (
            !el.component && platformMustUseProp(el.tag, el.attrsMap.type, name)
          )) {
            addProp(el, name, value);
          } else {
            addAttr(el, name, value);
          }
        } else if (onRE.test(name)) { // v-on
          name = name.replace(onRE, '');
          addHandler(el, name, value, modifiers, false, warn$2);
        } else { // normal directives
          name = name.replace(dirRE, '');
          // parse arg
          var argMatch = name.match(argRE);
          var arg = argMatch && argMatch[1];
          if (arg) {
            name = name.slice(0, -(arg.length + 1));
          }
          addDirective(el, name, rawName, value, arg, modifiers);
          if (process.env.NODE_ENV !== 'production' && name === 'model') {
            checkForAliasModel(el, value);
          }
        }
      } else {
        // literal attribute
        if (process.env.NODE_ENV !== 'production') {
          var expression = parseText(value, delimiters);
          if (expression) {
            warn$2(
              name + "=\"" + value + "\": " +
              'Interpolation inside attributes has been removed. ' +
              'Use v-bind or the colon shorthand instead. For example, ' +
              'instead of <div id="{{ val }}">, use <div :id="val">.'
            );
          }
        }
        addAttr(el, name, JSON.stringify(value));
        // #6887 firefox doesn't update muted state if set via attribute
        // even immediately after element creation
        if (!el.component &&
            name === 'muted' &&
            platformMustUseProp(el.tag, el.attrsMap.type, name)) {
          addProp(el, name, 'true');
        }
      }
    }
  }
  
  function checkInFor (el) {
    var parent = el;
    while (parent) {
      if (parent.for !== undefined) {
        return true
      }
      parent = parent.parent;
    }
    return false
  }
  
  function parseModifiers (name) {
    var match = name.match(modifierRE);
    if (match) {
      var ret = {};
      match.forEach(function (m) { ret[m.slice(1)] = true; });
      return ret
    }
  }
  
  function makeAttrsMap (attrs) {
    var map = {};
    for (var i = 0, l = attrs.length; i < l; i++) {
      if (
        process.env.NODE_ENV !== 'production' &&
        map[attrs[i].name] && !isIE && !isEdge
      ) {
        warn$2('duplicate attribute: ' + attrs[i].name);
      }
      map[attrs[i].name] = attrs[i].value;
    }
    return map
  }
  
  // for script (e.g. type="x/template") or style, do not decode content
  function isTextTag (el) {
    return el.tag === 'script' || el.tag === 'style'
  }
  
  function isForbiddenTag (el) {
    return (
      el.tag === 'style' ||
      (el.tag === 'script' && (
        !el.attrsMap.type ||
        el.attrsMap.type === 'text/javascript'
      ))
    )
  }
  
  var ieNSBug = /^xmlns:NS\d+/;
  var ieNSPrefix = /^NS\d+:/;
  
  /* istanbul ignore next */
  function guardIESVGBug (attrs) {
    var res = [];
    for (var i = 0; i < attrs.length; i++) {
      var attr = attrs[i];
      if (!ieNSBug.test(attr.name)) {
        attr.name = attr.name.replace(ieNSPrefix, '');
        res.push(attr);
      }
    }
    return res
  }
  
  function checkForAliasModel (el, value) {
    var _el = el;
    while (_el) {
      if (_el.for && _el.alias === value) {
        warn$2(
          "<" + (el.tag) + " v-model=\"" + value + "\">: " +
          "You are binding v-model directly to a v-for iteration alias. " +
          "This will not be able to modify the v-for source array because " +
          "writing to the alias is like modifying a function local variable. " +
          "Consider using an array of objects and use v-model on an object property instead."
        );
      }
      _el = _el.parent;
    }
  }
  
  /*  */
  
  /**
   * Expand input[v-model] with dyanmic type bindings into v-if-else chains
   * Turn this:
   *   <input v-model="data[type]" :type="type">
   * into this:
   *   <input v-if="type === 'checkbox'" type="checkbox" v-model="data[type]">
   *   <input v-else-if="type === 'radio'" type="radio" v-model="data[type]">
   *   <input v-else :type="type" v-model="data[type]">
   */
  
  function preTransformNode (el, options) {
    if (el.tag === 'input') {
      var map = el.attrsMap;
      if (map['v-model'] && (map['v-bind:type'] || map[':type'])) {
        var typeBinding = getBindingAttr(el, 'type');
        var ifCondition = getAndRemoveAttr(el, 'v-if', true);
        var ifConditionExtra = ifCondition ? ("&&(" + ifCondition + ")") : "";
        var hasElse = getAndRemoveAttr(el, 'v-else', true) != null;
        var elseIfCondition = getAndRemoveAttr(el, 'v-else-if', true);
        // 1. checkbox
        var branch0 = cloneASTElement(el);
        // process for on the main node
        processFor(branch0);
        addRawAttr(branch0, 'type', 'checkbox');
        processElement(branch0, options);
        branch0.processed = true; // prevent it from double-processed
        branch0.if = "(" + typeBinding + ")==='checkbox'" + ifConditionExtra;
        addIfCondition(branch0, {
          exp: branch0.if,
          block: branch0
        });
        // 2. add radio else-if condition
        var branch1 = cloneASTElement(el);
        getAndRemoveAttr(branch1, 'v-for', true);
        addRawAttr(branch1, 'type', 'radio');
        processElement(branch1, options);
        addIfCondition(branch0, {
          exp: "(" + typeBinding + ")==='radio'" + ifConditionExtra,
          block: branch1
        });
        // 3. other
        var branch2 = cloneASTElement(el);
        getAndRemoveAttr(branch2, 'v-for', true);
        addRawAttr(branch2, ':type', typeBinding);
        processElement(branch2, options);
        addIfCondition(branch0, {
          exp: ifCondition,
          block: branch2
        });
  
        if (hasElse) {
          branch0.else = true;
        } else if (elseIfCondition) {
          branch0.elseif = elseIfCondition;
        }
  
        return branch0
      }
    }
  }
  
  function cloneASTElement (el) {
    return createASTElement(el.tag, el.attrsList.slice(), el.parent)
  }
  
  function addRawAttr (el, name, value) {
    el.attrsMap[name] = value;
    el.attrsList.push({ name: name, value: value });
  }
  
  var model$2 = {
    preTransformNode: preTransformNode
  };
  
  var modules$1 = [
    klass$1,
    style$1,
    model$2
  ];
  
  /*  */
  
  function text (el, dir) {
    if (dir.value) {
      addProp(el, 'textContent', ("_s(" + (dir.value) + ")"));
    }
  }
  
  /*  */
  
  function html (el, dir) {
    if (dir.value) {
      addProp(el, 'innerHTML', ("_s(" + (dir.value) + ")"));
    }
  }
  
  var directives$1 = {
    model: model,
    text: text,
    html: html
  };
  
  /*  */
  
  var baseOptions = {
    expectHTML: true,
    modules: modules$1,
    directives: directives$1,
    isPreTag: isPreTag,
    isUnaryTag: isUnaryTag,
    mustUseProp: mustUseProp,
    canBeLeftOpenTag: canBeLeftOpenTag,
    isReservedTag: isReservedTag,
    getTagNamespace: getTagNamespace,
    staticKeys: genStaticKeys(modules$1)
  };
  
  /*  */
  
  var isStaticKey;
  var isPlatformReservedTag;
  
  var genStaticKeysCached = cached(genStaticKeys$1);
  
  /**
   * Goal of the optimizer: walk the generated template AST tree
   * and detect sub-trees that are purely static, i.e. parts of
   * the DOM that never needs to change.
   *
   * Once we detect these sub-trees, we can:
   *
   * 1. Hoist them into constants, so that we no longer need to
   *    create fresh nodes for them on each re-render;
   * 2. Completely skip them in the patching process.
   */
  function optimize (root, options) {
    if (!root) { return }
    isStaticKey = genStaticKeysCached(options.staticKeys || '');
    isPlatformReservedTag = options.isReservedTag || no;
    // first pass: mark all non-static nodes.
    markStatic$1(root);
    // second pass: mark static roots.
    markStaticRoots(root, false);
  }
  
  function genStaticKeys$1 (keys) {
    return makeMap(
      'type,tag,attrsList,attrsMap,plain,parent,children,attrs' +
      (keys ? ',' + keys : '')
    )
  }
  
  function markStatic$1 (node) {
    node.static = isStatic(node);
    if (node.type === 1) {
      // do not make component slot content static. this avoids
      // 1. components not able to mutate slot nodes
      // 2. static slot content fails for hot-reloading
      if (
        !isPlatformReservedTag(node.tag) &&
        node.tag !== 'slot' &&
        node.attrsMap['inline-template'] == null
      ) {
        return
      }
      for (var i = 0, l = node.children.length; i < l; i++) {
        var child = node.children[i];
        markStatic$1(child);
        if (!child.static) {
          node.static = false;
        }
      }
      if (node.ifConditions) {
        for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
          var block = node.ifConditions[i$1].block;
          markStatic$1(block);
          if (!block.static) {
            node.static = false;
          }
        }
      }
    }
  }
  
  function markStaticRoots (node, isInFor) {
    if (node.type === 1) {
      if (node.static || node.once) {
        node.staticInFor = isInFor;
      }
      // For a node to qualify as a static root, it should have children that
      // are not just static text. Otherwise the cost of hoisting out will
      // outweigh the benefits and it's better off to just always render it fresh.
      if (node.static && node.children.length && !(
        node.children.length === 1 &&
        node.children[0].type === 3
      )) {
        node.staticRoot = true;
        return
      } else {
        node.staticRoot = false;
      }
      if (node.children) {
        for (var i = 0, l = node.children.length; i < l; i++) {
          markStaticRoots(node.children[i], isInFor || !!node.for);
        }
      }
      if (node.ifConditions) {
        for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
          markStaticRoots(node.ifConditions[i$1].block, isInFor);
        }
      }
    }
  }
  
  function isStatic (node) {
    if (node.type === 2) { // expression
      return false
    }
    if (node.type === 3) { // text
      return true
    }
    return !!(node.pre || (
      !node.hasBindings && // no dynamic bindings
      !node.if && !node.for && // not v-if or v-for or v-else
      !isBuiltInTag(node.tag) && // not a built-in
      isPlatformReservedTag(node.tag) && // not a component
      !isDirectChildOfTemplateFor(node) &&
      Object.keys(node).every(isStaticKey)
    ))
  }
  
  function isDirectChildOfTemplateFor (node) {
    while (node.parent) {
      node = node.parent;
      if (node.tag !== 'template') {
        return false
      }
      if (node.for) {
        return true
      }
    }
    return false
  }
  
  /*  */
  
  var fnExpRE = /^\s*([\w$_]+|\([^)]*?\))\s*=>|^function\s*\(/;
  var simplePathRE = /^\s*[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['.*?']|\[".*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*\s*$/;
  
  // keyCode aliases
  var keyCodes = {
    esc: 27,
    tab: 9,
    enter: 13,
    space: 32,
    up: 38,
    left: 37,
    right: 39,
    down: 40,
    'delete': [8, 46]
  };
  
  // #4868: modifiers that prevent the execution of the listener
  // need to explicitly return null so that we can determine whether to remove
  // the listener for .once
  var genGuard = function (condition) { return ("if(" + condition + ")return null;"); };
  
  var modifierCode = {
    stop: '$event.stopPropagation();',
    prevent: '$event.preventDefault();',
    self: genGuard("$event.target !== $event.currentTarget"),
    ctrl: genGuard("!$event.ctrlKey"),
    shift: genGuard("!$event.shiftKey"),
    alt: genGuard("!$event.altKey"),
    meta: genGuard("!$event.metaKey"),
    left: genGuard("'button' in $event && $event.button !== 0"),
    middle: genGuard("'button' in $event && $event.button !== 1"),
    right: genGuard("'button' in $event && $event.button !== 2")
  };
  
  function genHandlers (
    events,
    isNative,
    warn
  ) {
    var res = isNative ? 'nativeOn:{' : 'on:{';
    for (var name in events) {
      var handler = events[name];
      // #5330: warn click.right, since right clicks do not actually fire click events.
      if (process.env.NODE_ENV !== 'production' &&
        name === 'click' &&
        handler && handler.modifiers && handler.modifiers.right
      ) {
        warn(
          "Use \"contextmenu\" instead of \"click.right\" since right clicks " +
          "do not actually fire \"click\" events."
        );
      }
      res += "\"" + name + "\":" + (genHandler(name, handler)) + ",";
    }
    return res.slice(0, -1) + '}'
  }
  
  function genHandler (
    name,
    handler
  ) {
    if (!handler) {
      return 'function(){}'
    }
  
    if (Array.isArray(handler)) {
      return ("[" + (handler.map(function (handler) { return genHandler(name, handler); }).join(',')) + "]")
    }
  
    var isMethodPath = simplePathRE.test(handler.value);
    var isFunctionExpression = fnExpRE.test(handler.value);
  
    if (!handler.modifiers) {
      return isMethodPath || isFunctionExpression
        ? handler.value
        : ("function($event){" + (handler.value) + "}") // inline statement
    } else {
      var code = '';
      var genModifierCode = '';
      var keys = [];
      for (var key in handler.modifiers) {
        if (modifierCode[key]) {
          genModifierCode += modifierCode[key];
          // left/right
          if (keyCodes[key]) {
            keys.push(key);
          }
        } else if (key === 'exact') {
          var modifiers = (handler.modifiers);
          genModifierCode += genGuard(
            ['ctrl', 'shift', 'alt', 'meta']
              .filter(function (keyModifier) { return !modifiers[keyModifier]; })
              .map(function (keyModifier) { return ("$event." + keyModifier + "Key"); })
              .join('||')
          );
        } else {
          keys.push(key);
        }
      }
      if (keys.length) {
        code += genKeyFilter(keys);
      }
      // Make sure modifiers like prevent and stop get executed after key filtering
      if (genModifierCode) {
        code += genModifierCode;
      }
      var handlerCode = isMethodPath
        ? handler.value + '($event)'
        : isFunctionExpression
          ? ("(" + (handler.value) + ")($event)")
          : handler.value;
      return ("function($event){" + code + handlerCode + "}")
    }
  }
  
  function genKeyFilter (keys) {
    return ("if(!('button' in $event)&&" + (keys.map(genFilterCode).join('&&')) + ")return null;")
  }
  
  function genFilterCode (key) {
    var keyVal = parseInt(key, 10);
    if (keyVal) {
      return ("$event.keyCode!==" + keyVal)
    }
    var code = keyCodes[key];
    return (
      "_k($event.keyCode," +
      (JSON.stringify(key)) + "," +
      (JSON.stringify(code)) + "," +
      "$event.key)"
    )
  }
  
  /*  */
  
  function on (el, dir) {
    if (process.env.NODE_ENV !== 'production' && dir.modifiers) {
      warn("v-on without argument does not support modifiers.");
    }
    el.wrapListeners = function (code) { return ("_g(" + code + "," + (dir.value) + ")"); };
  }
  
  /*  */
  
  function bind$1 (el, dir) {
    el.wrapData = function (code) {
      return ("_b(" + code + ",'" + (el.tag) + "'," + (dir.value) + "," + (dir.modifiers && dir.modifiers.prop ? 'true' : 'false') + (dir.modifiers && dir.modifiers.sync ? ',true' : '') + ")")
    };
  }
  
  /*  */
  
  var baseDirectives = {
    on: on,
    bind: bind$1,
    cloak: noop
  };
  
  /*  */
  
  var CodegenState = function CodegenState (options) {
    this.options = options;
    this.warn = options.warn || baseWarn;
    this.transforms = pluckModuleFunction(options.modules, 'transformCode');
    this.dataGenFns = pluckModuleFunction(options.modules, 'genData');
    this.directives = extend(extend({}, baseDirectives), options.directives);
    var isReservedTag = options.isReservedTag || no;
    this.maybeComponent = function (el) { return !isReservedTag(el.tag); };
    this.onceId = 0;
    this.staticRenderFns = [];
  };
  
  
  
  function generate (
    ast,
    options
  ) {
    var state = new CodegenState(options);
    var code = ast ? genElement(ast, state) : '_c("div")';
    return {
      render: ("with(this){return " + code + "}"),
      staticRenderFns: state.staticRenderFns
    }
  }
  
  function genElement (el, state) {
    if (el.staticRoot && !el.staticProcessed) {
      return genStatic(el, state)
    } else if (el.once && !el.onceProcessed) {
      return genOnce(el, state)
    } else if (el.for && !el.forProcessed) {
      return genFor(el, state)
    } else if (el.if && !el.ifProcessed) {
      return genIf(el, state)
    } else if (el.tag === 'template' && !el.slotTarget) {
      return genChildren(el, state) || 'void 0'
    } else if (el.tag === 'slot') {
      return genSlot(el, state)
    } else {
      // component or element
      var code;
      if (el.component) {
        code = genComponent(el.component, el, state);
      } else {
        var data = el.plain ? undefined : genData$2(el, state);
  
        var children = el.inlineTemplate ? null : genChildren(el, state, true);
        code = "_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")";
      }
      // module transforms
      for (var i = 0; i < state.transforms.length; i++) {
        code = state.transforms[i](el, code);
      }
      return code
    }
  }
  
  // hoist static sub-trees out
  function genStatic (el, state) {
    el.staticProcessed = true;
    state.staticRenderFns.push(("with(this){return " + (genElement(el, state)) + "}"));
    return ("_m(" + (state.staticRenderFns.length - 1) + (el.staticInFor ? ',true' : '') + ")")
  }
  
  // v-once
  function genOnce (el, state) {
    el.onceProcessed = true;
    if (el.if && !el.ifProcessed) {
      return genIf(el, state)
    } else if (el.staticInFor) {
      var key = '';
      var parent = el.parent;
      while (parent) {
        if (parent.for) {
          key = parent.key;
          break
        }
        parent = parent.parent;
      }
      if (!key) {
        process.env.NODE_ENV !== 'production' && state.warn(
          "v-once can only be used inside v-for that is keyed. "
        );
        return genElement(el, state)
      }
      return ("_o(" + (genElement(el, state)) + "," + (state.onceId++) + "," + key + ")")
    } else {
      return genStatic(el, state)
    }
  }
  
  function genIf (
    el,
    state,
    altGen,
    altEmpty
  ) {
    el.ifProcessed = true; // avoid recursion
    return genIfConditions(el.ifConditions.slice(), state, altGen, altEmpty)
  }
  
  function genIfConditions (
    conditions,
    state,
    altGen,
    altEmpty
  ) {
    if (!conditions.length) {
      return altEmpty || '_e()'
    }
  
    var condition = conditions.shift();
    if (condition.exp) {
      return ("(" + (condition.exp) + ")?" + (genTernaryExp(condition.block)) + ":" + (genIfConditions(conditions, state, altGen, altEmpty)))
    } else {
      return ("" + (genTernaryExp(condition.block)))
    }
  
    // v-if with v-once should generate code like (a)?_m(0):_m(1)
    function genTernaryExp (el) {
      return altGen
        ? altGen(el, state)
        : el.once
          ? genOnce(el, state)
          : genElement(el, state)
    }
  }
  
  function genFor (
    el,
    state,
    altGen,
    altHelper
  ) {
    var exp = el.for;
    var alias = el.alias;
    var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
    var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';
  
    if (process.env.NODE_ENV !== 'production' &&
      state.maybeComponent(el) &&
      el.tag !== 'slot' &&
      el.tag !== 'template' &&
      !el.key
    ) {
      state.warn(
        "<" + (el.tag) + " v-for=\"" + alias + " in " + exp + "\">: component lists rendered with " +
        "v-for should have explicit keys. " +
        "See https://vuejs.org/guide/list.html#key for more info.",
        true /* tip */
      );
    }
  
    el.forProcessed = true; // avoid recursion
    return (altHelper || '_l') + "((" + exp + ")," +
      "function(" + alias + iterator1 + iterator2 + "){" +
        "return " + ((altGen || genElement)(el, state)) +
      '})'
  }
  
  function genData$2 (el, state) {
    var data = '{';
  
    // directives first.
    // directives may mutate the el's other properties before they are generated.
    var dirs = genDirectives(el, state);
    if (dirs) { data += dirs + ','; }
  
    // key
    if (el.key) {
      data += "key:" + (el.key) + ",";
    }
    // ref
    if (el.ref) {
      data += "ref:" + (el.ref) + ",";
    }
    if (el.refInFor) {
      data += "refInFor:true,";
    }
    // pre
    if (el.pre) {
      data += "pre:true,";
    }
    // record original tag name for components using "is" attribute
    if (el.component) {
      data += "tag:\"" + (el.tag) + "\",";
    }
    // module data generation functions
    for (var i = 0; i < state.dataGenFns.length; i++) {
      data += state.dataGenFns[i](el);
    }
    // attributes
    if (el.attrs) {
      data += "attrs:{" + (genProps(el.attrs)) + "},";
    }
    // DOM props
    if (el.props) {
      data += "domProps:{" + (genProps(el.props)) + "},";
    }
    // event handlers
    if (el.events) {
      data += (genHandlers(el.events, false, state.warn)) + ",";
    }
    if (el.nativeEvents) {
      data += (genHandlers(el.nativeEvents, true, state.warn)) + ",";
    }
    // slot target
    // only for non-scoped slots
    if (el.slotTarget && !el.slotScope) {
      data += "slot:" + (el.slotTarget) + ",";
    }
    // scoped slots
    if (el.scopedSlots) {
      data += (genScopedSlots(el.scopedSlots, state)) + ",";
    }
    // component v-model
    if (el.model) {
      data += "model:{value:" + (el.model.value) + ",callback:" + (el.model.callback) + ",expression:" + (el.model.expression) + "},";
    }
    // inline-template
    if (el.inlineTemplate) {
      var inlineTemplate = genInlineTemplate(el, state);
      if (inlineTemplate) {
        data += inlineTemplate + ",";
      }
    }
    data = data.replace(/,$/, '') + '}';
    // v-bind data wrap
    if (el.wrapData) {
      data = el.wrapData(data);
    }
    // v-on data wrap
    if (el.wrapListeners) {
      data = el.wrapListeners(data);
    }
    return data
  }
  
  function genDirectives (el, state) {
    var dirs = el.directives;
    if (!dirs) { return }
    var res = 'directives:[';
    var hasRuntime = false;
    var i, l, dir, needRuntime;
    for (i = 0, l = dirs.length; i < l; i++) {
      dir = dirs[i];
      needRuntime = true;
      var gen = state.directives[dir.name];
      if (gen) {
        // compile-time directive that manipulates AST.
        // returns true if it also needs a runtime counterpart.
        needRuntime = !!gen(el, dir, state.warn);
      }
      if (needRuntime) {
        hasRuntime = true;
        res += "{name:\"" + (dir.name) + "\",rawName:\"" + (dir.rawName) + "\"" + (dir.value ? (",value:(" + (dir.value) + "),expression:" + (JSON.stringify(dir.value))) : '') + (dir.arg ? (",arg:\"" + (dir.arg) + "\"") : '') + (dir.modifiers ? (",modifiers:" + (JSON.stringify(dir.modifiers))) : '') + "},";
      }
    }
    if (hasRuntime) {
      return res.slice(0, -1) + ']'
    }
  }
  
  function genInlineTemplate (el, state) {
    var ast = el.children[0];
    if (process.env.NODE_ENV !== 'production' && (
      el.children.length !== 1 || ast.type !== 1
    )) {
      state.warn('Inline-template components must have exactly one child element.');
    }
    if (ast.type === 1) {
      var inlineRenderFns = generate(ast, state.options);
      return ("inlineTemplate:{render:function(){" + (inlineRenderFns.render) + "},staticRenderFns:[" + (inlineRenderFns.staticRenderFns.map(function (code) { return ("function(){" + code + "}"); }).join(',')) + "]}")
    }
  }
  
  function genScopedSlots (
    slots,
    state
  ) {
    return ("scopedSlots:_u([" + (Object.keys(slots).map(function (key) {
        return genScopedSlot(key, slots[key], state)
      }).join(',')) + "])")
  }
  
  function genScopedSlot (
    key,
    el,
    state
  ) {
    if (el.for && !el.forProcessed) {
      return genForScopedSlot(key, el, state)
    }
    var fn = "function(" + (String(el.slotScope)) + "){" +
      "return " + (el.tag === 'template'
        ? el.if
          ? ((el.if) + "?" + (genChildren(el, state) || 'undefined') + ":undefined")
          : genChildren(el, state) || 'undefined'
        : genElement(el, state)) + "}";
    return ("{key:" + key + ",fn:" + fn + "}")
  }
  
  function genForScopedSlot (
    key,
    el,
    state
  ) {
    var exp = el.for;
    var alias = el.alias;
    var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
    var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';
    el.forProcessed = true; // avoid recursion
    return "_l((" + exp + ")," +
      "function(" + alias + iterator1 + iterator2 + "){" +
        "return " + (genScopedSlot(key, el, state)) +
      '})'
  }
  
  function genChildren (
    el,
    state,
    checkSkip,
    altGenElement,
    altGenNode
  ) {
    var children = el.children;
    if (children.length) {
      var el$1 = children[0];
      // optimize single v-for
      if (children.length === 1 &&
        el$1.for &&
        el$1.tag !== 'template' &&
        el$1.tag !== 'slot'
      ) {
        return (altGenElement || genElement)(el$1, state)
      }
      var normalizationType = checkSkip
        ? getNormalizationType(children, state.maybeComponent)
        : 0;
      var gen = altGenNode || genNode;
      return ("[" + (children.map(function (c) { return gen(c, state); }).join(',')) + "]" + (normalizationType ? ("," + normalizationType) : ''))
    }
  }
  
  // determine the normalization needed for the children array.
  // 0: no normalization needed
  // 1: simple normalization needed (possible 1-level deep nested array)
  // 2: full normalization needed
  function getNormalizationType (
    children,
    maybeComponent
  ) {
    var res = 0;
    for (var i = 0; i < children.length; i++) {
      var el = children[i];
      if (el.type !== 1) {
        continue
      }
      if (needsNormalization(el) ||
          (el.ifConditions && el.ifConditions.some(function (c) { return needsNormalization(c.block); }))) {
        res = 2;
        break
      }
      if (maybeComponent(el) ||
          (el.ifConditions && el.ifConditions.some(function (c) { return maybeComponent(c.block); }))) {
        res = 1;
      }
    }
    return res
  }
  
  function needsNormalization (el) {
    return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'
  }
  
  function genNode (node, state) {
    if (node.type === 1) {
      return genElement(node, state)
    } if (node.type === 3 && node.isComment) {
      return genComment(node)
    } else {
      return genText(node)
    }
  }
  
  function genText (text) {
    return ("_v(" + (text.type === 2
      ? text.expression // no need for () because already wrapped in _s()
      : transformSpecialNewlines(JSON.stringify(text.text))) + ")")
  }
  
  function genComment (comment) {
    return ("_e(" + (JSON.stringify(comment.text)) + ")")
  }
  
  function genSlot (el, state) {
    var slotName = el.slotName || '"default"';
    var children = genChildren(el, state);
    var res = "_t(" + slotName + (children ? ("," + children) : '');
    var attrs = el.attrs && ("{" + (el.attrs.map(function (a) { return ((camelize(a.name)) + ":" + (a.value)); }).join(',')) + "}");
    var bind$$1 = el.attrsMap['v-bind'];
    if ((attrs || bind$$1) && !children) {
      res += ",null";
    }
    if (attrs) {
      res += "," + attrs;
    }
    if (bind$$1) {
      res += (attrs ? '' : ',null') + "," + bind$$1;
    }
    return res + ')'
  }
  
  // componentName is el.component, take it as argument to shun flow's pessimistic refinement
  function genComponent (
    componentName,
    el,
    state
  ) {
    var children = el.inlineTemplate ? null : genChildren(el, state, true);
    return ("_c(" + componentName + "," + (genData$2(el, state)) + (children ? ("," + children) : '') + ")")
  }
  
  function genProps (props) {
    var res = '';
    for (var i = 0; i < props.length; i++) {
      var prop = props[i];
      res += "\"" + (prop.name) + "\":" + (transformSpecialNewlines(prop.value)) + ",";
    }
    return res.slice(0, -1)
  }
  
  // #3895, #4268
  function transformSpecialNewlines (text) {
    return text
      .replace(/\u2028/g, '\\u2028')
      .replace(/\u2029/g, '\\u2029')
  }
  
  /*  */
  
  // these keywords should not appear inside expressions, but operators like
  // typeof, instanceof and in are allowed
  var prohibitedKeywordRE = new RegExp('\\b' + (
    'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
    'super,throw,while,yield,delete,export,import,return,switch,default,' +
    'extends,finally,continue,debugger,function,arguments'
  ).split(',').join('\\b|\\b') + '\\b');
  
  // these unary operators should not be used as property/method names
  var unaryOperatorsRE = new RegExp('\\b' + (
    'delete,typeof,void'
  ).split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)');
  
  // check valid identifier for v-for
  var identRE = /[A-Za-z_$][\w$]*/;
  
  // strip strings in expressions
  var stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;
  
  // detect problematic expressions in a template
  function detectErrors (ast) {
    var errors = [];
    if (ast) {
      checkNode(ast, errors);
    }
    return errors
  }
  
  function checkNode (node, errors) {
    if (node.type === 1) {
      for (var name in node.attrsMap) {
        if (dirRE.test(name)) {
          var value = node.attrsMap[name];
          if (value) {
            if (name === 'v-for') {
              checkFor(node, ("v-for=\"" + value + "\""), errors);
            } else if (onRE.test(name)) {
              checkEvent(value, (name + "=\"" + value + "\""), errors);
            } else {
              checkExpression(value, (name + "=\"" + value + "\""), errors);
            }
          }
        }
      }
      if (node.children) {
        for (var i = 0; i < node.children.length; i++) {
          checkNode(node.children[i], errors);
        }
      }
    } else if (node.type === 2) {
      checkExpression(node.expression, node.text, errors);
    }
  }
  
  function checkEvent (exp, text, errors) {
    var stipped = exp.replace(stripStringRE, '');
    var keywordMatch = stipped.match(unaryOperatorsRE);
    if (keywordMatch && stipped.charAt(keywordMatch.index - 1) !== '$') {
      errors.push(
        "avoid using JavaScript unary operator as property name: " +
        "\"" + (keywordMatch[0]) + "\" in expression " + (text.trim())
      );
    }
    checkExpression(exp, text, errors);
  }
  
  function checkFor (node, text, errors) {
    checkExpression(node.for || '', text, errors);
    checkIdentifier(node.alias, 'v-for alias', text, errors);
    checkIdentifier(node.iterator1, 'v-for iterator', text, errors);
    checkIdentifier(node.iterator2, 'v-for iterator', text, errors);
  }
  
  function checkIdentifier (ident, type, text, errors) {
    if (typeof ident === 'string' && !identRE.test(ident)) {
      errors.push(("invalid " + type + " \"" + ident + "\" in expression: " + (text.trim())));
    }
  }
  
  function checkExpression (exp, text, errors) {
    try {
      new Function(("return " + exp));
    } catch (e) {
      var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);
      if (keywordMatch) {
        errors.push(
          "avoid using JavaScript keyword as property name: " +
          "\"" + (keywordMatch[0]) + "\"\n  Raw expression: " + (text.trim())
        );
      } else {
        errors.push(
          "invalid expression: " + (e.message) + " in\n\n" +
          "    " + exp + "\n\n" +
          "  Raw expression: " + (text.trim()) + "\n"
        );
      }
    }
  }
  
  /*  */
  
  function createFunction (code, errors) {
    try {
      return new Function(code)
    } catch (err) {
      errors.push({ err: err, code: code });
      return noop
    }
  }
  
  function createCompileToFunctionFn (compile) {
    var cache = Object.create(null);
  
    return function compileToFunctions (
      template,
      options,
      vm
    ) {
      options = extend({}, options);
      var warn$$1 = options.warn || warn;
      delete options.warn;
  
      /* istanbul ignore if */
      if (process.env.NODE_ENV !== 'production') {
        // detect possible CSP restriction
        try {
          new Function('return 1');
        } catch (e) {
          if (e.toString().match(/unsafe-eval|CSP/)) {
            warn$$1(
              'It seems you are using the standalone build of Vue.js in an ' +
              'environment with Content Security Policy that prohibits unsafe-eval. ' +
              'The template compiler cannot work in this environment. Consider ' +
              'relaxing the policy to allow unsafe-eval or pre-compiling your ' +
              'templates into render functions.'
            );
          }
        }
      }
  
      // check cache
      var key = options.delimiters
        ? String(options.delimiters) + template
        : template;
      if (cache[key]) {
        return cache[key]
      }
  
      // compile
      var compiled = compile(template, options);
  
      // check compilation errors/tips
      if (process.env.NODE_ENV !== 'production') {
        if (compiled.errors && compiled.errors.length) {
          warn$$1(
            "Error compiling template:\n\n" + template + "\n\n" +
            compiled.errors.map(function (e) { return ("- " + e); }).join('\n') + '\n',
            vm
          );
        }
        if (compiled.tips && compiled.tips.length) {
          compiled.tips.forEach(function (msg) { return tip(msg, vm); });
        }
      }
  
      // turn code into functions
      var res = {};
      var fnGenErrors = [];
      res.render = createFunction(compiled.render, fnGenErrors);
      res.staticRenderFns = compiled.staticRenderFns.map(function (code) {
        return createFunction(code, fnGenErrors)
      });
  
      // check function generation errors.
      // this should only happen if there is a bug in the compiler itself.
      // mostly for codegen development use
      /* istanbul ignore if */
      if (process.env.NODE_ENV !== 'production') {
        if ((!compiled.errors || !compiled.errors.length) && fnGenErrors.length) {
          warn$$1(
            "Failed to generate render function:\n\n" +
            fnGenErrors.map(function (ref) {
              var err = ref.err;
              var code = ref.code;
  
              return ((err.toString()) + " in\n\n" + code + "\n");
          }).join('\n'),
            vm
          );
        }
      }
  
      return (cache[key] = res)
    }
  }
  
  /*  */
  
  function createCompilerCreator (baseCompile) {
    return function createCompiler (baseOptions) {
      function compile (
        template,
        options
      ) {
        var finalOptions = Object.create(baseOptions);
        var errors = [];
        var tips = [];
        finalOptions.warn = function (msg, tip) {
          (tip ? tips : errors).push(msg);
        };
  
        if (options) {
          // merge custom modules
          if (options.modules) {
            finalOptions.modules =
              (baseOptions.modules || []).concat(options.modules);
          }
          // merge custom directives
          if (options.directives) {
            finalOptions.directives = extend(
              Object.create(baseOptions.directives),
              options.directives
            );
          }
          // copy other options
          for (var key in options) {
            if (key !== 'modules' && key !== 'directives') {
              finalOptions[key] = options[key];
            }
          }
        }
  
        var compiled = baseCompile(template, finalOptions);
        if (process.env.NODE_ENV !== 'production') {
          errors.push.apply(errors, detectErrors(compiled.ast));
        }
        compiled.errors = errors;
        compiled.tips = tips;
        return compiled
      }
  
      return {
        compile: compile,
        compileToFunctions: createCompileToFunctionFn(compile)
      }
    }
  }
  
  /*  */
  
  // `createCompilerCreator` allows creating compilers that use alternative
  // parser/optimizer/codegen, e.g the SSR optimizing compiler.
  // Here we just export a default compiler using the default parts.
  var createCompiler = createCompilerCreator(function baseCompile (
    template,
    options
  ) {
    var ast = parse(template.trim(), options);
    optimize(ast, options);
    var code = generate(ast, options);
    return {
      ast: ast,
      render: code.render,
      staticRenderFns: code.staticRenderFns
    }
  });
  
  /*  */
  
  var ref$1 = createCompiler(baseOptions);
  var compileToFunctions = ref$1.compileToFunctions;
  
  /*  */
  
  // check whether current browser encodes a char inside attribute values
  var div;
  function getShouldDecode (href) {
    div = div || document.createElement('div');
    div.innerHTML = href ? "<a href=\"\n\"/>" : "<div a=\"\n\"/>";
    return div.innerHTML.indexOf('&#10;') > 0
  }
  
  // #3663: IE encodes newlines inside attribute values while other browsers don't
  var shouldDecodeNewlines = inBrowser ? getShouldDecode(false) : false;
  // #6828: chrome encodes content in a[href]
  var shouldDecodeNewlinesForHref = inBrowser ? getShouldDecode(true) : false;
  
  /*  */
  
  var idToTemplate = cached(function (id) {
    var el = query(id);
    return el && el.innerHTML
  });
  
  var mount = Vue$3.prototype.$mount;
  Vue$3.prototype.$mount = function (
    el,
    hydrating
  ) {
    el = el && query(el);
  
    /* istanbul ignore if */
    if (el === document.body || el === document.documentElement) {
      process.env.NODE_ENV !== 'production' && warn(
        "Do not mount Vue to <html> or <body> - mount to normal elements instead."
      );
      return this
    }
  
    var options = this.$options;
    // resolve template/el and convert to render function
    if (!options.render) {
      var template = options.template;
      if (template) {
        if (typeof template === 'string') {
          if (template.charAt(0) === '#') {
            template = idToTemplate(template);
            /* istanbul ignore if */
            if (process.env.NODE_ENV !== 'production' && !template) {
              warn(
                ("Template element not found or is empty: " + (options.template)),
                this
              );
            }
          }
        } else if (template.nodeType) {
          template = template.innerHTML;
        } else {
          if (process.env.NODE_ENV !== 'production') {
            warn('invalid template option:' + template, this);
          }
          return this
        }
      } else if (el) {
        template = getOuterHTML(el);
      }
      if (template) {
        /* istanbul ignore if */
        if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
          mark('compile');
        }
  
        var ref = compileToFunctions(template, {
          shouldDecodeNewlines: shouldDecodeNewlines,
          shouldDecodeNewlinesForHref: shouldDecodeNewlinesForHref,
          delimiters: options.delimiters,
          comments: options.comments
        }, this);
        var render = ref.render;
        var staticRenderFns = ref.staticRenderFns;
        options.render = render;
        options.staticRenderFns = staticRenderFns;
  
        /* istanbul ignore if */
        if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
          mark('compile end');
          measure(("vue " + (this._name) + " compile"), 'compile', 'compile end');
        }
      }
    }
    return mount.call(this, el, hydrating)
  };
  
  /**
   * Get outerHTML of elements, taking care
   * of SVG elements in IE as well.
   */
  function getOuterHTML (el) {
    if (el.outerHTML) {
      return el.outerHTML
    } else {
      var container = document.createElement('div');
      container.appendChild(el.cloneNode(true));
      return container.innerHTML
    }
  }
  
  Vue$3.compile = compileToFunctions;
  
  module.exports = Vue$3;
  
  }).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"_process":30}],37:[function(require,module,exports){
  (function (process){
  /**
   * vuex v3.0.1
   * (c) 2017 Evan You
   * @license MIT
   */
  'use strict';
  
  var applyMixin = function (Vue) {
    var version = Number(Vue.version.split('.')[0]);
  
    if (version >= 2) {
      Vue.mixin({ beforeCreate: vuexInit });
    } else {
      // override init and inject vuex init procedure
      // for 1.x backwards compatibility.
      var _init = Vue.prototype._init;
      Vue.prototype._init = function (options) {
        if ( options === void 0 ) options = {};
  
        options.init = options.init
          ? [vuexInit].concat(options.init)
          : vuexInit;
        _init.call(this, options);
      };
    }
  
    /**
     * Vuex init hook, injected into each instances init hooks list.
     */
  
    function vuexInit () {
      var options = this.$options;
      // store injection
      if (options.store) {
        this.$store = typeof options.store === 'function'
          ? options.store()
          : options.store;
      } else if (options.parent && options.parent.$store) {
        this.$store = options.parent.$store;
      }
    }
  };
  
  var devtoolHook =
    typeof window !== 'undefined' &&
    window.__VUE_DEVTOOLS_GLOBAL_HOOK__;
  
  function devtoolPlugin (store) {
    if (!devtoolHook) { return }
  
    store._devtoolHook = devtoolHook;
  
    devtoolHook.emit('vuex:init', store);
  
    devtoolHook.on('vuex:travel-to-state', function (targetState) {
      store.replaceState(targetState);
    });
  
    store.subscribe(function (mutation, state) {
      devtoolHook.emit('vuex:mutation', mutation, state);
    });
  }
  
  /**
   * Get the first item that pass the test
   * by second argument function
   *
   * @param {Array} list
   * @param {Function} f
   * @return {*}
   */
  /**
   * Deep copy the given object considering circular structure.
   * This function caches all nested objects and its copies.
   * If it detects circular structure, use cached copy to avoid infinite loop.
   *
   * @param {*} obj
   * @param {Array<Object>} cache
   * @return {*}
   */
  
  
  /**
   * forEach for object
   */
  function forEachValue (obj, fn) {
    Object.keys(obj).forEach(function (key) { return fn(obj[key], key); });
  }
  
  function isObject (obj) {
    return obj !== null && typeof obj === 'object'
  }
  
  function isPromise (val) {
    return val && typeof val.then === 'function'
  }
  
  function assert (condition, msg) {
    if (!condition) { throw new Error(("[vuex] " + msg)) }
  }
  
  var Module = function Module (rawModule, runtime) {
    this.runtime = runtime;
    this._children = Object.create(null);
    this._rawModule = rawModule;
    var rawState = rawModule.state;
    this.state = (typeof rawState === 'function' ? rawState() : rawState) || {};
  };
  
  var prototypeAccessors$1 = { namespaced: { configurable: true } };
  
  prototypeAccessors$1.namespaced.get = function () {
    return !!this._rawModule.namespaced
  };
  
  Module.prototype.addChild = function addChild (key, module) {
    this._children[key] = module;
  };
  
  Module.prototype.removeChild = function removeChild (key) {
    delete this._children[key];
  };
  
  Module.prototype.getChild = function getChild (key) {
    return this._children[key]
  };
  
  Module.prototype.update = function update (rawModule) {
    this._rawModule.namespaced = rawModule.namespaced;
    if (rawModule.actions) {
      this._rawModule.actions = rawModule.actions;
    }
    if (rawModule.mutations) {
      this._rawModule.mutations = rawModule.mutations;
    }
    if (rawModule.getters) {
      this._rawModule.getters = rawModule.getters;
    }
  };
  
  Module.prototype.forEachChild = function forEachChild (fn) {
    forEachValue(this._children, fn);
  };
  
  Module.prototype.forEachGetter = function forEachGetter (fn) {
    if (this._rawModule.getters) {
      forEachValue(this._rawModule.getters, fn);
    }
  };
  
  Module.prototype.forEachAction = function forEachAction (fn) {
    if (this._rawModule.actions) {
      forEachValue(this._rawModule.actions, fn);
    }
  };
  
  Module.prototype.forEachMutation = function forEachMutation (fn) {
    if (this._rawModule.mutations) {
      forEachValue(this._rawModule.mutations, fn);
    }
  };
  
  Object.defineProperties( Module.prototype, prototypeAccessors$1 );
  
  var ModuleCollection = function ModuleCollection (rawRootModule) {
    // register root module (Vuex.Store options)
    this.register([], rawRootModule, false);
  };
  
  ModuleCollection.prototype.get = function get (path) {
    return path.reduce(function (module, key) {
      return module.getChild(key)
    }, this.root)
  };
  
  ModuleCollection.prototype.getNamespace = function getNamespace (path) {
    var module = this.root;
    return path.reduce(function (namespace, key) {
      module = module.getChild(key);
      return namespace + (module.namespaced ? key + '/' : '')
    }, '')
  };
  
  ModuleCollection.prototype.update = function update$1 (rawRootModule) {
    update([], this.root, rawRootModule);
  };
  
  ModuleCollection.prototype.register = function register (path, rawModule, runtime) {
      var this$1 = this;
      if ( runtime === void 0 ) runtime = true;
  
    if (process.env.NODE_ENV !== 'production') {
      assertRawModule(path, rawModule);
    }
  
    var newModule = new Module(rawModule, runtime);
    if (path.length === 0) {
      this.root = newModule;
    } else {
      var parent = this.get(path.slice(0, -1));
      parent.addChild(path[path.length - 1], newModule);
    }
  
    // register nested modules
    if (rawModule.modules) {
      forEachValue(rawModule.modules, function (rawChildModule, key) {
        this$1.register(path.concat(key), rawChildModule, runtime);
      });
    }
  };
  
  ModuleCollection.prototype.unregister = function unregister (path) {
    var parent = this.get(path.slice(0, -1));
    var key = path[path.length - 1];
    if (!parent.getChild(key).runtime) { return }
  
    parent.removeChild(key);
  };
  
  function update (path, targetModule, newModule) {
    if (process.env.NODE_ENV !== 'production') {
      assertRawModule(path, newModule);
    }
  
    // update target module
    targetModule.update(newModule);
  
    // update nested modules
    if (newModule.modules) {
      for (var key in newModule.modules) {
        if (!targetModule.getChild(key)) {
          if (process.env.NODE_ENV !== 'production') {
            console.warn(
              "[vuex] trying to add a new module '" + key + "' on hot reloading, " +
              'manual reload is needed'
            );
          }
          return
        }
        update(
          path.concat(key),
          targetModule.getChild(key),
          newModule.modules[key]
        );
      }
    }
  }
  
  var functionAssert = {
    assert: function (value) { return typeof value === 'function'; },
    expected: 'function'
  };
  
  var objectAssert = {
    assert: function (value) { return typeof value === 'function' ||
      (typeof value === 'object' && typeof value.handler === 'function'); },
    expected: 'function or object with "handler" function'
  };
  
  var assertTypes = {
    getters: functionAssert,
    mutations: functionAssert,
    actions: objectAssert
  };
  
  function assertRawModule (path, rawModule) {
    Object.keys(assertTypes).forEach(function (key) {
      if (!rawModule[key]) { return }
  
      var assertOptions = assertTypes[key];
  
      forEachValue(rawModule[key], function (value, type) {
        assert(
          assertOptions.assert(value),
          makeAssertionMessage(path, key, type, value, assertOptions.expected)
        );
      });
    });
  }
  
  function makeAssertionMessage (path, key, type, value, expected) {
    var buf = key + " should be " + expected + " but \"" + key + "." + type + "\"";
    if (path.length > 0) {
      buf += " in module \"" + (path.join('.')) + "\"";
    }
    buf += " is " + (JSON.stringify(value)) + ".";
    return buf
  }
  
  var Vue; // bind on install
  
  var Store = function Store (options) {
    var this$1 = this;
    if ( options === void 0 ) options = {};
  
    // Auto install if it is not done yet and `window` has `Vue`.
    // To allow users to avoid auto-installation in some cases,
    // this code should be placed here. See #731
    if (!Vue && typeof window !== 'undefined' && window.Vue) {
      install(window.Vue);
    }
  
    if (process.env.NODE_ENV !== 'production') {
      assert(Vue, "must call Vue.use(Vuex) before creating a store instance.");
      assert(typeof Promise !== 'undefined', "vuex requires a Promise polyfill in this browser.");
      assert(this instanceof Store, "Store must be called with the new operator.");
    }
  
    var plugins = options.plugins; if ( plugins === void 0 ) plugins = [];
    var strict = options.strict; if ( strict === void 0 ) strict = false;
  
    var state = options.state; if ( state === void 0 ) state = {};
    if (typeof state === 'function') {
      state = state() || {};
    }
  
    // store internal state
    this._committing = false;
    this._actions = Object.create(null);
    this._actionSubscribers = [];
    this._mutations = Object.create(null);
    this._wrappedGetters = Object.create(null);
    this._modules = new ModuleCollection(options);
    this._modulesNamespaceMap = Object.create(null);
    this._subscribers = [];
    this._watcherVM = new Vue();
  
    // bind commit and dispatch to self
    var store = this;
    var ref = this;
    var dispatch = ref.dispatch;
    var commit = ref.commit;
    this.dispatch = function boundDispatch (type, payload) {
      return dispatch.call(store, type, payload)
    };
    this.commit = function boundCommit (type, payload, options) {
      return commit.call(store, type, payload, options)
    };
  
    // strict mode
    this.strict = strict;
  
    // init root module.
    // this also recursively registers all sub-modules
    // and collects all module getters inside this._wrappedGetters
    installModule(this, state, [], this._modules.root);
  
    // initialize the store vm, which is responsible for the reactivity
    // (also registers _wrappedGetters as computed properties)
    resetStoreVM(this, state);
  
    // apply plugins
    plugins.forEach(function (plugin) { return plugin(this$1); });
  
    if (Vue.config.devtools) {
      devtoolPlugin(this);
    }
  };
  
  var prototypeAccessors = { state: { configurable: true } };
  
  prototypeAccessors.state.get = function () {
    return this._vm._data.$$state
  };
  
  prototypeAccessors.state.set = function (v) {
    if (process.env.NODE_ENV !== 'production') {
      assert(false, "Use store.replaceState() to explicit replace store state.");
    }
  };
  
  Store.prototype.commit = function commit (_type, _payload, _options) {
      var this$1 = this;
  
    // check object-style commit
    var ref = unifyObjectStyle(_type, _payload, _options);
      var type = ref.type;
      var payload = ref.payload;
      var options = ref.options;
  
    var mutation = { type: type, payload: payload };
    var entry = this._mutations[type];
    if (!entry) {
      if (process.env.NODE_ENV !== 'production') {
        console.error(("[vuex] unknown mutation type: " + type));
      }
      return
    }
    this._withCommit(function () {
      entry.forEach(function commitIterator (handler) {
        handler(payload);
      });
    });
    this._subscribers.forEach(function (sub) { return sub(mutation, this$1.state); });
  
    if (
      process.env.NODE_ENV !== 'production' &&
      options && options.silent
    ) {
      console.warn(
        "[vuex] mutation type: " + type + ". Silent option has been removed. " +
        'Use the filter functionality in the vue-devtools'
      );
    }
  };
  
  Store.prototype.dispatch = function dispatch (_type, _payload) {
      var this$1 = this;
  
    // check object-style dispatch
    var ref = unifyObjectStyle(_type, _payload);
      var type = ref.type;
      var payload = ref.payload;
  
    var action = { type: type, payload: payload };
    var entry = this._actions[type];
    if (!entry) {
      if (process.env.NODE_ENV !== 'production') {
        console.error(("[vuex] unknown action type: " + type));
      }
      return
    }
  
    this._actionSubscribers.forEach(function (sub) { return sub(action, this$1.state); });
  
    return entry.length > 1
      ? Promise.all(entry.map(function (handler) { return handler(payload); }))
      : entry[0](payload)
  };
  
  Store.prototype.subscribe = function subscribe (fn) {
    return genericSubscribe(fn, this._subscribers)
  };
  
  Store.prototype.subscribeAction = function subscribeAction (fn) {
    return genericSubscribe(fn, this._actionSubscribers)
  };
  
  Store.prototype.watch = function watch (getter, cb, options) {
      var this$1 = this;
  
    if (process.env.NODE_ENV !== 'production') {
      assert(typeof getter === 'function', "store.watch only accepts a function.");
    }
    return this._watcherVM.$watch(function () { return getter(this$1.state, this$1.getters); }, cb, options)
  };
  
  Store.prototype.replaceState = function replaceState (state) {
      var this$1 = this;
  
    this._withCommit(function () {
      this$1._vm._data.$$state = state;
    });
  };
  
  Store.prototype.registerModule = function registerModule (path, rawModule, options) {
      if ( options === void 0 ) options = {};
  
    if (typeof path === 'string') { path = [path]; }
  
    if (process.env.NODE_ENV !== 'production') {
      assert(Array.isArray(path), "module path must be a string or an Array.");
      assert(path.length > 0, 'cannot register the root module by using registerModule.');
    }
  
    this._modules.register(path, rawModule);
    installModule(this, this.state, path, this._modules.get(path), options.preserveState);
    // reset store to update getters...
    resetStoreVM(this, this.state);
  };
  
  Store.prototype.unregisterModule = function unregisterModule (path) {
      var this$1 = this;
  
    if (typeof path === 'string') { path = [path]; }
  
    if (process.env.NODE_ENV !== 'production') {
      assert(Array.isArray(path), "module path must be a string or an Array.");
    }
  
    this._modules.unregister(path);
    this._withCommit(function () {
      var parentState = getNestedState(this$1.state, path.slice(0, -1));
      Vue.delete(parentState, path[path.length - 1]);
    });
    resetStore(this);
  };
  
  Store.prototype.hotUpdate = function hotUpdate (newOptions) {
    this._modules.update(newOptions);
    resetStore(this, true);
  };
  
  Store.prototype._withCommit = function _withCommit (fn) {
    var committing = this._committing;
    this._committing = true;
    fn();
    this._committing = committing;
  };
  
  Object.defineProperties( Store.prototype, prototypeAccessors );
  
  function genericSubscribe (fn, subs) {
    if (subs.indexOf(fn) < 0) {
      subs.push(fn);
    }
    return function () {
      var i = subs.indexOf(fn);
      if (i > -1) {
        subs.splice(i, 1);
      }
    }
  }
  
  function resetStore (store, hot) {
    store._actions = Object.create(null);
    store._mutations = Object.create(null);
    store._wrappedGetters = Object.create(null);
    store._modulesNamespaceMap = Object.create(null);
    var state = store.state;
    // init all modules
    installModule(store, state, [], store._modules.root, true);
    // reset vm
    resetStoreVM(store, state, hot);
  }
  
  function resetStoreVM (store, state, hot) {
    var oldVm = store._vm;
  
    // bind store public getters
    store.getters = {};
    var wrappedGetters = store._wrappedGetters;
    var computed = {};
    forEachValue(wrappedGetters, function (fn, key) {
      // use computed to leverage its lazy-caching mechanism
      computed[key] = function () { return fn(store); };
      Object.defineProperty(store.getters, key, {
        get: function () { return store._vm[key]; },
        enumerable: true // for local getters
      });
    });
  
    // use a Vue instance to store the state tree
    // suppress warnings just in case the user has added
    // some funky global mixins
    var silent = Vue.config.silent;
    Vue.config.silent = true;
    store._vm = new Vue({
      data: {
        $$state: state
      },
      computed: computed
    });
    Vue.config.silent = silent;
  
    // enable strict mode for new vm
    if (store.strict) {
      enableStrictMode(store);
    }
  
    if (oldVm) {
      if (hot) {
        // dispatch changes in all subscribed watchers
        // to force getter re-evaluation for hot reloading.
        store._withCommit(function () {
          oldVm._data.$$state = null;
        });
      }
      Vue.nextTick(function () { return oldVm.$destroy(); });
    }
  }
  
  function installModule (store, rootState, path, module, hot) {
    var isRoot = !path.length;
    var namespace = store._modules.getNamespace(path);
  
    // register in namespace map
    if (module.namespaced) {
      store._modulesNamespaceMap[namespace] = module;
    }
  
    // set state
    if (!isRoot && !hot) {
      var parentState = getNestedState(rootState, path.slice(0, -1));
      var moduleName = path[path.length - 1];
      store._withCommit(function () {
        Vue.set(parentState, moduleName, module.state);
      });
    }
  
    var local = module.context = makeLocalContext(store, namespace, path);
  
    module.forEachMutation(function (mutation, key) {
      var namespacedType = namespace + key;
      registerMutation(store, namespacedType, mutation, local);
    });
  
    module.forEachAction(function (action, key) {
      var type = action.root ? key : namespace + key;
      var handler = action.handler || action;
      registerAction(store, type, handler, local);
    });
  
    module.forEachGetter(function (getter, key) {
      var namespacedType = namespace + key;
      registerGetter(store, namespacedType, getter, local);
    });
  
    module.forEachChild(function (child, key) {
      installModule(store, rootState, path.concat(key), child, hot);
    });
  }
  
  /**
   * make localized dispatch, commit, getters and state
   * if there is no namespace, just use root ones
   */
  function makeLocalContext (store, namespace, path) {
    var noNamespace = namespace === '';
  
    var local = {
      dispatch: noNamespace ? store.dispatch : function (_type, _payload, _options) {
        var args = unifyObjectStyle(_type, _payload, _options);
        var payload = args.payload;
        var options = args.options;
        var type = args.type;
  
        if (!options || !options.root) {
          type = namespace + type;
          if (process.env.NODE_ENV !== 'production' && !store._actions[type]) {
            console.error(("[vuex] unknown local action type: " + (args.type) + ", global type: " + type));
            return
          }
        }
  
        return store.dispatch(type, payload)
      },
  
      commit: noNamespace ? store.commit : function (_type, _payload, _options) {
        var args = unifyObjectStyle(_type, _payload, _options);
        var payload = args.payload;
        var options = args.options;
        var type = args.type;
  
        if (!options || !options.root) {
          type = namespace + type;
          if (process.env.NODE_ENV !== 'production' && !store._mutations[type]) {
            console.error(("[vuex] unknown local mutation type: " + (args.type) + ", global type: " + type));
            return
          }
        }
  
        store.commit(type, payload, options);
      }
    };
  
    // getters and state object must be gotten lazily
    // because they will be changed by vm update
    Object.defineProperties(local, {
      getters: {
        get: noNamespace
          ? function () { return store.getters; }
          : function () { return makeLocalGetters(store, namespace); }
      },
      state: {
        get: function () { return getNestedState(store.state, path); }
      }
    });
  
    return local
  }
  
  function makeLocalGetters (store, namespace) {
    var gettersProxy = {};
  
    var splitPos = namespace.length;
    Object.keys(store.getters).forEach(function (type) {
      // skip if the target getter is not match this namespace
      if (type.slice(0, splitPos) !== namespace) { return }
  
      // extract local getter type
      var localType = type.slice(splitPos);
  
      // Add a port to the getters proxy.
      // Define as getter property because
      // we do not want to evaluate the getters in this time.
      Object.defineProperty(gettersProxy, localType, {
        get: function () { return store.getters[type]; },
        enumerable: true
      });
    });
  
    return gettersProxy
  }
  
  function registerMutation (store, type, handler, local) {
    var entry = store._mutations[type] || (store._mutations[type] = []);
    entry.push(function wrappedMutationHandler (payload) {
      handler.call(store, local.state, payload);
    });
  }
  
  function registerAction (store, type, handler, local) {
    var entry = store._actions[type] || (store._actions[type] = []);
    entry.push(function wrappedActionHandler (payload, cb) {
      var res = handler.call(store, {
        dispatch: local.dispatch,
        commit: local.commit,
        getters: local.getters,
        state: local.state,
        rootGetters: store.getters,
        rootState: store.state
      }, payload, cb);
      if (!isPromise(res)) {
        res = Promise.resolve(res);
      }
      if (store._devtoolHook) {
        return res.catch(function (err) {
          store._devtoolHook.emit('vuex:error', err);
          throw err
        })
      } else {
        return res
      }
    });
  }
  
  function registerGetter (store, type, rawGetter, local) {
    if (store._wrappedGetters[type]) {
      if (process.env.NODE_ENV !== 'production') {
        console.error(("[vuex] duplicate getter key: " + type));
      }
      return
    }
    store._wrappedGetters[type] = function wrappedGetter (store) {
      return rawGetter(
        local.state, // local state
        local.getters, // local getters
        store.state, // root state
        store.getters // root getters
      )
    };
  }
  
  function enableStrictMode (store) {
    store._vm.$watch(function () { return this._data.$$state }, function () {
      if (process.env.NODE_ENV !== 'production') {
        assert(store._committing, "Do not mutate vuex store state outside mutation handlers.");
      }
    }, { deep: true, sync: true });
  }
  
  function getNestedState (state, path) {
    return path.length
      ? path.reduce(function (state, key) { return state[key]; }, state)
      : state
  }
  
  function unifyObjectStyle (type, payload, options) {
    if (isObject(type) && type.type) {
      options = payload;
      payload = type;
      type = type.type;
    }
  
    if (process.env.NODE_ENV !== 'production') {
      assert(typeof type === 'string', ("Expects string as the type, but found " + (typeof type) + "."));
    }
  
    return { type: type, payload: payload, options: options }
  }
  
  function install (_Vue) {
    if (Vue && _Vue === Vue) {
      if (process.env.NODE_ENV !== 'production') {
        console.error(
          '[vuex] already installed. Vue.use(Vuex) should be called only once.'
        );
      }
      return
    }
    Vue = _Vue;
    applyMixin(Vue);
  }
  
  var mapState = normalizeNamespace(function (namespace, states) {
    var res = {};
    normalizeMap(states).forEach(function (ref) {
      var key = ref.key;
      var val = ref.val;
  
      res[key] = function mappedState () {
        var state = this.$store.state;
        var getters = this.$store.getters;
        if (namespace) {
          var module = getModuleByNamespace(this.$store, 'mapState', namespace);
          if (!module) {
            return
          }
          state = module.context.state;
          getters = module.context.getters;
        }
        return typeof val === 'function'
          ? val.call(this, state, getters)
          : state[val]
      };
      // mark vuex getter for devtools
      res[key].vuex = true;
    });
    return res
  });
  
  var mapMutations = normalizeNamespace(function (namespace, mutations) {
    var res = {};
    normalizeMap(mutations).forEach(function (ref) {
      var key = ref.key;
      var val = ref.val;
  
      res[key] = function mappedMutation () {
        var args = [], len = arguments.length;
        while ( len-- ) args[ len ] = arguments[ len ];
  
        var commit = this.$store.commit;
        if (namespace) {
          var module = getModuleByNamespace(this.$store, 'mapMutations', namespace);
          if (!module) {
            return
          }
          commit = module.context.commit;
        }
        return typeof val === 'function'
          ? val.apply(this, [commit].concat(args))
          : commit.apply(this.$store, [val].concat(args))
      };
    });
    return res
  });
  
  var mapGetters = normalizeNamespace(function (namespace, getters) {
    var res = {};
    normalizeMap(getters).forEach(function (ref) {
      var key = ref.key;
      var val = ref.val;
  
      val = namespace + val;
      res[key] = function mappedGetter () {
        if (namespace && !getModuleByNamespace(this.$store, 'mapGetters', namespace)) {
          return
        }
        if (process.env.NODE_ENV !== 'production' && !(val in this.$store.getters)) {
          console.error(("[vuex] unknown getter: " + val));
          return
        }
        return this.$store.getters[val]
      };
      // mark vuex getter for devtools
      res[key].vuex = true;
    });
    return res
  });
  
  var mapActions = normalizeNamespace(function (namespace, actions) {
    var res = {};
    normalizeMap(actions).forEach(function (ref) {
      var key = ref.key;
      var val = ref.val;
  
      res[key] = function mappedAction () {
        var args = [], len = arguments.length;
        while ( len-- ) args[ len ] = arguments[ len ];
  
        var dispatch = this.$store.dispatch;
        if (namespace) {
          var module = getModuleByNamespace(this.$store, 'mapActions', namespace);
          if (!module) {
            return
          }
          dispatch = module.context.dispatch;
        }
        return typeof val === 'function'
          ? val.apply(this, [dispatch].concat(args))
          : dispatch.apply(this.$store, [val].concat(args))
      };
    });
    return res
  });
  
  var createNamespacedHelpers = function (namespace) { return ({
    mapState: mapState.bind(null, namespace),
    mapGetters: mapGetters.bind(null, namespace),
    mapMutations: mapMutations.bind(null, namespace),
    mapActions: mapActions.bind(null, namespace)
  }); };
  
  function normalizeMap (map) {
    return Array.isArray(map)
      ? map.map(function (key) { return ({ key: key, val: key }); })
      : Object.keys(map).map(function (key) { return ({ key: key, val: map[key] }); })
  }
  
  function normalizeNamespace (fn) {
    return function (namespace, map) {
      if (typeof namespace !== 'string') {
        map = namespace;
        namespace = '';
      } else if (namespace.charAt(namespace.length - 1) !== '/') {
        namespace += '/';
      }
      return fn(namespace, map)
    }
  }
  
  function getModuleByNamespace (store, helper, namespace) {
    var module = store._modulesNamespaceMap[namespace];
    if (process.env.NODE_ENV !== 'production' && !module) {
      console.error(("[vuex] module namespace not found in " + helper + "(): " + namespace));
    }
    return module
  }
  
  var index = {
    Store: Store,
    install: install,
    version: '3.0.1',
    mapState: mapState,
    mapMutations: mapMutations,
    mapGetters: mapGetters,
    mapActions: mapActions,
    createNamespacedHelpers: createNamespacedHelpers
  };
  
  module.exports = index;
  
  }).call(this,require('_process'))
  },{"_process":30}],38:[function(require,module,exports){
  'use strict';
  
  var _vue = require('vue');
  
  var _vue2 = _interopRequireDefault(_vue);
  
  var _vuex = require('vuex');
  
  var _vuex2 = _interopRequireDefault(_vuex);
  
  var _http = require('./http.js');
  
  var _http2 = _interopRequireDefault(_http);
  
  var _store = require('./store');
  
  var _store2 = _interopRequireDefault(_store);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  _vue2.default.use(_vuex2.default); /**
                                      * Created by shawnpivonka on 11/13/17.
                                      */
  
  _vue2.default.use(_http2.default);
  
  var app = new _vue2.default({
      store: _store2.default,
      el: '#app',
      components: {
          /** Page Components **/
          usersIndex: require('./components/users/index.vue'),
          usersCreate: require('./components/users/create.vue'),
          usersEdit: require('./components/users/edit.vue'),
          formsIndex: require('./components/forms/index.vue'),
          formsCreate: require('./components/forms/create.vue'),
          formsEdit: require('./components/forms/edit.vue')
      },
      mixins: [],
      created: function created() {
          console.log('app created');
      },
  
      directives: {
          state: {
              bind: function bind(element, binding) {
                  _store2.default.commit('setState', binding.value);
              }
          }
      }
  
  });
  
  },{"./components/forms/create.vue":39,"./components/forms/edit.vue":40,"./components/forms/index.vue":42,"./components/users/create.vue":48,"./components/users/edit.vue":49,"./components/users/index.vue":51,"./http.js":52,"./store":54,"vue":36,"vuex":37}],39:[function(require,module,exports){
  'use strict';
  
  Object.defineProperty(exports, "__esModule", {
      value: true
  });
  
  var _form = require('./form.vue');
  
  var _form2 = _interopRequireDefault(_form);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  exports.default = {
      name: 'form',
      data: function data() {
          return {};
      },
  
      components: {
          formsForm: _form2.default
      }
  };
  if (module.exports.__esModule) module.exports = module.exports.default
  ;(typeof module.exports === "function"? module.exports.options: module.exports).template = "\n<div>\n    <div class=\"row margin-bottom-md\">\n        <div class=\"col-12\">\n            <h1 class=\"pull-left\">Create Form</h1>\n        </div>\n    </div>\n\n    <div class=\"row\">\n        <div class=\"col-12\">\n            <forms-form></forms-form>\n        </div>\n    </div>\n</div>\n"
  if (module.hot) {(function () {  module.hot.accept()
    var hotAPI = require("vue-hot-reload-api")
    hotAPI.install(require("vue"), true)
    if (!hotAPI.compatible) return
    if (!module.hot.data) {
      hotAPI.createRecord("_v-54ee0409", module.exports)
    } else {
      hotAPI.update("_v-54ee0409", module.exports, (typeof module.exports === "function" ? module.exports.options : module.exports).template)
    }
  })()}
  },{"./form.vue":41,"vue":36,"vue-hot-reload-api":35}],40:[function(require,module,exports){
  'use strict';
  
  Object.defineProperty(exports, "__esModule", {
      value: true
  });
  
  var _form = require('./form.vue');
  
  var _form2 = _interopRequireDefault(_form);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  exports.default = {
      name: 'form',
      data: function data() {
          return {
              pageLoaded: true
          };
      },
  
      mixins: [],
      components: {
          formsForm: _form2.default
      },
      mounted: function mounted() {
          this.$httpGet('form', { id: 5 }).then(function () {}, function () {});
      }
  };
  if (module.exports.__esModule) module.exports = module.exports.default
  ;(typeof module.exports === "function"? module.exports.options: module.exports).template = "\n<div>\n    <div class=\"row margin-bottom-md\">\n        <div class=\"col-12\">\n            <h1 class=\"pull-left\">Edit Form</h1>\n        </div>\n    </div>\n\n    <div class=\"row\" v-if=\"! pageLoaded\">\n        <div class=\"col-12\">\n            Loading Page...\n        </div>\n    </div>\n\n    <div v-else=\"\">\n        <forms-form></forms-form>\n    </div>\n\n</div>\n"
  if (module.hot) {(function () {  module.hot.accept()
    var hotAPI = require("vue-hot-reload-api")
    hotAPI.install(require("vue"), true)
    if (!hotAPI.compatible) return
    if (!module.hot.data) {
      hotAPI.createRecord("_v-90cc9952", module.exports)
    } else {
      hotAPI.update("_v-90cc9952", module.exports, (typeof module.exports === "function" ? module.exports.options : module.exports).template)
    }
  })()}
  },{"./form.vue":41,"vue":36,"vue-hot-reload-api":35}],41:[function(require,module,exports){
  'use strict';
  
  var _lodash = require('lodash');
  
  var _lodash2 = _interopRequireDefault(_lodash);
  
  var _vueButton = require('../general/buttons/vue-button.vue');
  
  var _vueButton2 = _interopRequireDefault(_vueButton);
  
  var _basicInputField = require('../general/forms/basic-input-field.vue');
  
  var _basicInputField2 = _interopRequireDefault(_basicInputField);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  module.exports = {
      data: function data() {
          return {
              errors: {}
          };
      },
  
      components: {
          basicInputField: _basicInputField2.default,
          vueButton: _vueButton2.default
      },
      computed: {
          form: function form() {
              return this.$store.state.form;
          }
      },
      methods: {
          saveForm: function saveForm() {
              if (this.form.id) {
                  return this.$httpPut('form', { id: this.form.id }, this.form).catch(this.setErrors);
              } else {
                  return this.$httpPost('form', {}, this.form).catch(this.setErrors);
              }
          },
          setErrors: function setErrors(error) {
              this.errors = error.response.data;
  
              throw error;
          }
      },
      watch: {
          'form': {
              handler: function handler(newValue, oldValue) {
                  var _this = this;
  
                  this.$nextTick(function () {
                      if (_lodash2.default.isEmpty(_this.errors)) {
                          _this.$refs.updateFormButton.reset();
                      }
                  });
  
                  this.$store.commit('updateResource', { resource: 'form', value: newValue });
              },
              deep: true
          }
      }
  };
  if (module.exports.__esModule) module.exports = module.exports.default
  ;(typeof module.exports === "function"? module.exports.options: module.exports).template = "\n<div>\n    <basic-input-field v-model=\"form.name\" label=\"Name\" :errors.sync=\"errors.name\"></basic-input-field>\n    <basic-input-field v-model=\"form.email\" label=\"Email\" :errors.sync=\"errors.email\"></basic-input-field>\n    <basic-input-field v-model=\"form.password\" label=\"Password\" :errors.sync=\"errors.password\"></basic-input-field>\n\n    <vue-button class=\"pull-right\" :on-click=\"saveForm\" action=\"save\" ref=\"updateFormButton\"></vue-button>\n</div>\n"
  if (module.hot) {(function () {  module.hot.accept()
    var hotAPI = require("vue-hot-reload-api")
    hotAPI.install(require("vue"), true)
    if (!hotAPI.compatible) return
    if (!module.hot.data) {
      hotAPI.createRecord("_v-74586511", module.exports)
    } else {
      hotAPI.update("_v-74586511", module.exports, (typeof module.exports === "function" ? module.exports.options : module.exports).template)
    }
  })()}
  },{"../general/buttons/vue-button.vue":43,"../general/forms/basic-input-field.vue":44,"lodash":28,"vue":36,"vue-hot-reload-api":35}],42:[function(require,module,exports){
  'use strict';
  
  Object.defineProperty(exports, "__esModule", {
      value: true
  });
  
  var _Forms = require('../../store/modules/Forms');
  
  var _Forms2 = _interopRequireDefault(_Forms);
  
  var _vueTable = require('../general/tables/vue-table.vue');
  
  var _vueTable2 = _interopRequireDefault(_vueTable);
  
  var _axios = require('axios');
  
  var _axios2 = _interopRequireDefault(_axios);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  exports.default = {
      name: 'forms',
      data: function data() {
          return {
              columns: [{
                  header: 'Form Id',
                  column: 'id',
                  link: function link(form) {
                      return '/api/forms/' + form.id + '/edit';
                  }
              }, {
                  header: 'User Id',
                  column: 'user_id',
                  link: function link(form) {
                      return '/api/users/' + form.user_id + '/edit';
                  }
              }]
          };
      },
  
      components: {
          vueTable: _vueTable2.default
      },
      computed: {
          forms: function forms() {
              return this.$store.state.forms.data;
          }
      }
  };
  if (module.exports.__esModule) module.exports = module.exports.default
  ;(typeof module.exports === "function"? module.exports.options: module.exports).template = "\n<div>\n    <div class=\"row margin-bottom-md\">\n        <div class=\"col-12\">\n            <h1 class=\"pull-left\">Forms</h1>\n            <a class=\"btn btn-success margin-bottom-md pull-right margin-top-md\" href=\"/api/forms/create\">\n                Create Form\n            </a>\n        </div>\n    </div>\n\n    <div class=\"row\">\n        <div class=\"col-12\">\n            <vue-table :columns=\"columns\" :resources=\"forms\"></vue-table>\n        </div>\n    </div>\n</div>\n"
  if (module.hot) {(function () {  module.hot.accept()
    var hotAPI = require("vue-hot-reload-api")
    hotAPI.install(require("vue"), true)
    if (!hotAPI.compatible) return
    if (!module.hot.data) {
      hotAPI.createRecord("_v-7d547155", module.exports)
    } else {
      hotAPI.update("_v-7d547155", module.exports, (typeof module.exports === "function" ? module.exports.options : module.exports).template)
    }
  })()}
  },{"../../store/modules/Forms":55,"../general/tables/vue-table.vue":47,"axios":1,"vue":36,"vue-hot-reload-api":35}],43:[function(require,module,exports){
  'use strict';
  
  module.exports = {
      data: function data() {
          return {
              classSet: {
                  save: {
                      ready: 'btn btn-primary',
                      pending: 'btn btn-primary',
                      success: 'btn btn-success',
                      error: 'btn btn-danger'
                  },
                  delete: {
                      ready: 'btn btn-danger',
                      pending: 'btn btn-warning',
                      success: 'btn btn-success',
                      error: 'btn btn-danger'
                  }
              },
              status: 'ready'
          };
      },
      props: {
          labels: {
              type: Object,
              default: function _default() {
                  return {
                      ready: 'Save',
                      pending: 'Saving...',
                      success: 'Saved',
                      error: 'Error Saving'
                  };
              }
          },
          disabled: {
              type: Boolean,
              default: false
          },
          onClick: {
              required: true,
              type: Function
          },
          action: {
              required: true,
              type: String,
              default: 'save'
          }
      },
      computed: {
          needsConfirmation: function needsConfirmation() {
              return this.confirmationMessage;
          },
          classes: function classes() {
              if (this.disabled) {
                  return 'btn btn-disabled';
              }
  
              return this.classSet[this.action][this.status];
          },
          isDisabled: function isDisabled() {
              return this.disabled || !this.status === 'ready';
          },
          isLoading: function isLoading() {
              return this.status === 'pending';
          },
          buttonLabel: function buttonLabel() {
              return this.labels[this.status];
          }
      },
      methods: {
          clicked: function clicked() {
              if (this.needsConfirmation) {
                  this.confirm();
  
                  return;
              }
  
              this.process();
          },
          reset: function reset() {
              this.status = 'ready';
          },
          process: function process() {
              var _this = this;
  
              this.status = 'pending';
  
              this.onClick().then(function (response) {
                  _this.status = 'success';
              }).catch(function (error) {
                  _this.status = 'error';
              });
          }
      }
  };
  if (module.exports.__esModule) module.exports = module.exports.default
  ;(typeof module.exports === "function"? module.exports.options: module.exports).template = "\n<button :class=\"classes\" @click=\"clicked\" :disabled=\"isDisabled\"><span :class=\"{ 'fa fa-spinner fa-spin': isLoading}\"></span>\n    {{ buttonLabel }}\n</button>\n"
  if (module.hot) {(function () {  module.hot.accept()
    var hotAPI = require("vue-hot-reload-api")
    hotAPI.install(require("vue"), true)
    if (!hotAPI.compatible) return
    if (!module.hot.data) {
      hotAPI.createRecord("_v-53990c9b", module.exports)
    } else {
      hotAPI.update("_v-53990c9b", module.exports, (typeof module.exports === "function" ? module.exports.options : module.exports).template)
    }
  })()}
  },{"vue":36,"vue-hot-reload-api":35}],44:[function(require,module,exports){
  'use strict';
  
  var _inputField = require('./input-field.vue');
  
  var _inputField2 = _interopRequireDefault(_inputField);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  module.exports = {
      props: ['value', 'label', 'type', 'placeholder', 'errors'],
      components: {
          inputField: _inputField2.default
      },
      watch: {
          'value': {
              handler: function handler(newValue, oldValue) {
                  if (this.hasError) {
                      // Custom Error Validations should go here and if passes then clear the error
                      this.$emit('update:errors', undefined);
                  }
              }
          }
      },
      computed: {
          hasError: function hasError() {
              return this.errors === [] || !this.errors ? false : true;
          }
      }
  
  };
  if (module.exports.__esModule) module.exports = module.exports.default
  ;(typeof module.exports === "function"? module.exports.options: module.exports).template = "\n<div class=\"form-group\" :class=\"{'is-invalid': hasError}\">\n    <label v-if=\"label\" :class=\"{'text-danger': hasError}\">{{label}}</label>\n    <input @input=\"$emit('input', $event.target.value)\" :value=\"value\" :class=\"{'is-invalid': hasError}\" type=\"type ||'text'\" class=\"form-control\" :placeholder=\"placeholder\">\n    <div v-if=\"hasError\">\n        <div class=\"text-danger\" v-for=\"error in errors\">{{error}}</div>\n    </div>\n    <slot></slot>\n</div>\n"
  if (module.hot) {(function () {  module.hot.accept()
    var hotAPI = require("vue-hot-reload-api")
    hotAPI.install(require("vue"), true)
    if (!hotAPI.compatible) return
    if (!module.hot.data) {
      hotAPI.createRecord("_v-0babc774", module.exports)
    } else {
      hotAPI.update("_v-0babc774", module.exports, (typeof module.exports === "function" ? module.exports.options : module.exports).template)
    }
  })()}
  },{"./input-field.vue":45,"vue":36,"vue-hot-reload-api":35}],45:[function(require,module,exports){
  'use strict';
  
  module.exports = {
      props: ['value', 'type', 'placeholder']
  };
  if (module.exports.__esModule) module.exports = module.exports.default
  ;(typeof module.exports === "function"? module.exports.options: module.exports).template = "\n<input @input=\"$emit('input', $event.target.value)\" :value=\"value\" type=\"type ||'text'\" class=\"form-control\" :placeholder=\"placeholder\">\n"
  if (module.hot) {(function () {  module.hot.accept()
    var hotAPI = require("vue-hot-reload-api")
    hotAPI.install(require("vue"), true)
    if (!hotAPI.compatible) return
    if (!module.hot.data) {
      hotAPI.createRecord("_v-aebd1bda", module.exports)
    } else {
      hotAPI.update("_v-aebd1bda", module.exports, (typeof module.exports === "function" ? module.exports.options : module.exports).template)
    }
  })()}
  },{"vue":36,"vue-hot-reload-api":35}],46:[function(require,module,exports){
  'use strict';
  
  module.exports = {
      props: ['resource', 'columns']
  };
  if (module.exports.__esModule) module.exports = module.exports.default
  ;(typeof module.exports === "function"? module.exports.options: module.exports).template = "\n<tr>\n    <th v-for=\"column in columns\">\n        <a v-if=\"column.link\" :href=\"column.link(resource)\">{{resource[column['column']]}}</a>\n        <span v-else=\"\">{{resource[column['column']]}}</span>\n    </th>\n</tr>\n"
  if (module.hot) {(function () {  module.hot.accept()
    var hotAPI = require("vue-hot-reload-api")
    hotAPI.install(require("vue"), true)
    if (!hotAPI.compatible) return
    if (!module.hot.data) {
      hotAPI.createRecord("_v-55e95d1e", module.exports)
    } else {
      hotAPI.update("_v-55e95d1e", module.exports, (typeof module.exports === "function" ? module.exports.options : module.exports).template)
    }
  })()}
  },{"vue":36,"vue-hot-reload-api":35}],47:[function(require,module,exports){
  'use strict';
  
  var _vueTableRow = require('./vue-table-row.vue');
  
  var _vueTableRow2 = _interopRequireDefault(_vueTableRow);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  module.exports = {
      props: ['resources', 'columns'],
      components: {
          vueTableRow: _vueTableRow2.default
      }
  };
  if (module.exports.__esModule) module.exports = module.exports.default
  ;(typeof module.exports === "function"? module.exports.options: module.exports).template = "\n<div>\n    <div class=\"col-sm-6\">\n        <!--<search :callback=\"searchProducts\"></search>-->\n    </div>\n    <div class=\"col-sm-6\">\n        <div class=\"pull-right\">\n            <!--<pagination :pagination=\"pagination\" :callback=\"searchProducts\"></pagination>-->\n        </div>\n    </div>\n\n    <table class=\"table table-responsive table-striped table-bordered\">\n        <thead>\n        <tr>\n            <th v-for=\"column in columns\">{{ column.header }}</th>\n        </tr>\n        </thead>\n        <tbody>\n            <tr v-for=\"resource in resources\" is=\"vue-table-row\" :resource=\"resource\" :columns=\"columns\"></tr>\n        </tbody>\n    </table>\n\n    <!--<pagination :pagination=\"pagination\" :callback=\"searchProducts\"></pagination>-->\n</div>\n"
  if (module.hot) {(function () {  module.hot.accept()
    var hotAPI = require("vue-hot-reload-api")
    hotAPI.install(require("vue"), true)
    if (!hotAPI.compatible) return
    if (!module.hot.data) {
      hotAPI.createRecord("_v-78296191", module.exports)
    } else {
      hotAPI.update("_v-78296191", module.exports, (typeof module.exports === "function" ? module.exports.options : module.exports).template)
    }
  })()}
  },{"./vue-table-row.vue":46,"vue":36,"vue-hot-reload-api":35}],48:[function(require,module,exports){
  'use strict';
  
  Object.defineProperty(exports, "__esModule", {
      value: true
  });
  
  var _form = require('./form.vue');
  
  var _form2 = _interopRequireDefault(_form);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  exports.default = {
      name: 'user',
      components: {
          usersForm: _form2.default
      }
  };
  if (module.exports.__esModule) module.exports = module.exports.default
  ;(typeof module.exports === "function"? module.exports.options: module.exports).template = "\n<div>\n    <div class=\"row margin-bottom-md\">\n        <div class=\"col-12\">\n            <h1 class=\"pull-left\">Create User</h1>\n        </div>\n    </div>\n\n    <div class=\"row\">\n        <div class=\"col-12\">\n            <users-form></users-form>\n        </div>\n    </div>\n</div>\n"
  if (module.hot) {(function () {  module.hot.accept()
    var hotAPI = require("vue-hot-reload-api")
    hotAPI.install(require("vue"), true)
    if (!hotAPI.compatible) return
    if (!module.hot.data) {
      hotAPI.createRecord("_v-24339090", module.exports)
    } else {
      hotAPI.update("_v-24339090", module.exports, (typeof module.exports === "function" ? module.exports.options : module.exports).template)
    }
  })()}
  },{"./form.vue":50,"vue":36,"vue-hot-reload-api":35}],49:[function(require,module,exports){
  'use strict';
  
  Object.defineProperty(exports, "__esModule", {
      value: true
  });
  
  var _form = require('./form.vue');
  
  var _form2 = _interopRequireDefault(_form);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  exports.default = {
      name: 'user',
      components: {
          usersForm: _form2.default
      }
  };
  if (module.exports.__esModule) module.exports = module.exports.default
  ;(typeof module.exports === "function"? module.exports.options: module.exports).template = "\n<div>\n    <div class=\"row margin-bottom-md\">\n        <div class=\"col-12\">\n            <h1 class=\"pull-left\">Edit User</h1>\n        </div>\n    </div>\n\n    <div class=\"row\">\n        <div class=\"col-12\">\n            <users-form></users-form>\n        </div>\n    </div>\n</div>\n"
  if (module.hot) {(function () {  module.hot.accept()
    var hotAPI = require("vue-hot-reload-api")
    hotAPI.install(require("vue"), true)
    if (!hotAPI.compatible) return
    if (!module.hot.data) {
      hotAPI.createRecord("_v-3216b59e", module.exports)
    } else {
      hotAPI.update("_v-3216b59e", module.exports, (typeof module.exports === "function" ? module.exports.options : module.exports).template)
    }
  })()}
  },{"./form.vue":50,"vue":36,"vue-hot-reload-api":35}],50:[function(require,module,exports){
  'use strict';
  
  var _lodash = require('lodash');
  
  var _lodash2 = _interopRequireDefault(_lodash);
  
  var _vueButton = require('../general/buttons/vue-button.vue');
  
  var _vueButton2 = _interopRequireDefault(_vueButton);
  
  var _basicInputField = require('../general/forms/basic-input-field.vue');
  
  var _basicInputField2 = _interopRequireDefault(_basicInputField);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  module.exports = {
      data: function data() {
          return {
              errors: {}
          };
      },
  
      components: {
          basicInputField: _basicInputField2.default,
          vueButton: _vueButton2.default
      },
      computed: {
          user: {
              get: function get() {
                  return this.$store.state.user;
              },
              set: function set(value) {
                  // this.$store.commit('sync', {object: this.$store.state.user, value: value});
                  this.$store.commit('updateResource', { resource: 'user', value: value });
              }
          }
      },
      methods: {
          saveUser: function saveUser() {
              if (this.user.id) {
                  return this.$httpPut('user', { id: this.user.id }, this.user).catch(this.setErrors);
              } else {
                  return this.$httpPost('user', {}, this.user).catch(this.setErrors);
              }
          },
          setErrors: function setErrors(error) {
              this.errors = error.response.data;
  
              throw error;
          }
      },
      watch: {
          'user': {
              handler: function handler(newValue, oldValue) {
                  var _this = this;
  
                  this.$nextTick(function () {
                      if (_this.errors) {
                          _this.$refs.updateUserButton.reset();
                      }
                  });
              },
              deep: true
          }
      }
  };
  if (module.exports.__esModule) module.exports = module.exports.default
  ;(typeof module.exports === "function"? module.exports.options: module.exports).template = "\n<div>\n    <basic-input-field v-model=\"user.name\" label=\"Name\" :errors.sync=\"errors.name\"></basic-input-field>\n    <basic-input-field v-model=\"user.email\" label=\"Email\" :errors.sync=\"errors.email\"></basic-input-field>\n    <basic-input-field v-model=\"user.password\" label=\"Password\" :errors.sync=\"errors.password\"></basic-input-field>\n\n    <vue-button class=\"pull-right\" :on-click=\"saveUser\" action=\"save\" ref=\"updateUserButton\"></vue-button>\n</div>\n"
  if (module.hot) {(function () {  module.hot.accept()
    var hotAPI = require("vue-hot-reload-api")
    hotAPI.install(require("vue"), true)
    if (!hotAPI.compatible) return
    if (!module.hot.data) {
      hotAPI.createRecord("_v-22553150", module.exports)
    } else {
      hotAPI.update("_v-22553150", module.exports, (typeof module.exports === "function" ? module.exports.options : module.exports).template)
    }
  })()}
  },{"../general/buttons/vue-button.vue":43,"../general/forms/basic-input-field.vue":44,"lodash":28,"vue":36,"vue-hot-reload-api":35}],51:[function(require,module,exports){
  'use strict';
  
  Object.defineProperty(exports, "__esModule", {
      value: true
  });
  
  var _vueTable = require('../general/tables/vue-table.vue');
  
  var _vueTable2 = _interopRequireDefault(_vueTable);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  exports.default = {
  
      name: 'users',
      data: function data() {
          return {
              pageLoaded: false,
              columns: [{
                  header: 'Name',
                  column: 'name',
                  link: function link(user) {
                      return '/api/users/' + user.id + '/edit';
                  }
              }, {
                  header: 'Email',
                  column: 'email'
              }]
          };
      },
  
      props: ['storeState'],
      components: {
          vueTable: _vueTable2.default
      },
      computed: {
          users: function users() {
              return this.$store.state.users.data;
          }
      },
      mounted: function mounted() {
          this.$store.commit('setState', this.storeState);
      }
  };
  if (module.exports.__esModule) module.exports = module.exports.default
  ;(typeof module.exports === "function"? module.exports.options: module.exports).template = "\n<div>\n    <div class=\"row margin-bottom-md\">\n        <div class=\"col-xs-12\">\n            <h1 class=\"pull-left\">Users</h1>\n            <a class=\"btn btn-success margin-bottom-md pull-right margin-top-md\" href=\"/api/users/create\">\n                Create User\n            </a>\n        </div>\n    </div>\n\n    <div class=\"row\">\n        <div class=\"col-xs-12\">\n            <vue-table :columns=\"columns\" :resources=\"users\"></vue-table>\n        </div>\n    </div>\n</div>\n"
  if (module.hot) {(function () {  module.hot.accept()
    var hotAPI = require("vue-hot-reload-api")
    hotAPI.install(require("vue"), true)
    if (!hotAPI.compatible) return
    if (!module.hot.data) {
      hotAPI.createRecord("_v-5277b7ee", module.exports)
    } else {
      hotAPI.update("_v-5277b7ee", module.exports, (typeof module.exports === "function" ? module.exports.options : module.exports).template)
    }
  })()}
  },{"../general/tables/vue-table.vue":47,"vue":36,"vue-hot-reload-api":35}],52:[function(require,module,exports){
  'use strict';
  
  Object.defineProperty(exports, "__esModule", {
      value: true
  });
  
  var _axios = require('axios');
  
  var _axios2 = _interopRequireDefault(_axios);
  
  var _uriTemplates = require('uri-templates');
  
  var _uriTemplates2 = _interopRequireDefault(_uriTemplates);
  
  var _pluralize = require('pluralize');
  
  var _pluralize2 = _interopRequireDefault(_pluralize);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  var Http = {};
  
  
  Http.install = function (Vue, options) {
      Vue.prototype.$httpGet = function (resource, urlParams, query) {
          var _this = this;
  
          var url = (0, _uriTemplates2.default)('/api/' + (0, _pluralize2.default)(resource) + '{/id}{/action}').fill(urlParams || {});
  
          return _axios2.default.get(url, query || {}).then(function (response) {
              _this.$store.commit('updateResource', { resource: resource, value: response.data });
  
              return response;
          }).catch(function (error) {
              throw error;
          });
      };
  
      Vue.prototype.$httpPost = function (resource, urlParams, fieldBag) {
          var _this2 = this;
  
          var url = (0, _uriTemplates2.default)('/api/' + (0, _pluralize2.default)(resource) + '{/id}{/action}').fill(urlParams || {});
  
          return _axios2.default.post(url, fieldBag || {}).then(function (response) {
              _this2.$store.commit('updateResource', { resource: resource, value: response.data });
  
              return response;
          }).catch(function (error) {
              throw error;
          });
      };
  
      Vue.prototype.$httpPut = function (resource, urlParams, fieldBag) {
          var _this3 = this;
  
          var url = (0, _uriTemplates2.default)('/api/' + (0, _pluralize2.default)(resource) + '{/id}{/action}').fill(urlParams || {});
  
          return _axios2.default.put(url, fieldBag || {}).then(function (response) {
              _this3.$store.commit('updateResource', { resource: resource, value: response.data });
  
              return response;
          }).catch(function (error) {
              throw error;
          });
      };
  
      Vue.prototype.$httpDelete = function (resource, urlParams) {
          var _this4 = this;
  
          var url = (0, _uriTemplates2.default)('/api/' + (0, _pluralize2.default)(resource) + '{/id}{/action}').fill(urlParams || {});
  
          return _axios2.default.delete(url).then(function (response) {
              _this4.$store.commit('updateResource', { resource: resource, value: response.data });
  
              return response;
          }).catch(function (error) {
              throw error;
          });
      };
  };
  
  exports.default = Http; /**
                          * Created by shawnpivonka on 11/14/17.
                          */
  
  },{"axios":1,"pluralize":29,"uri-templates":34}],53:[function(require,module,exports){
  "use strict";
  
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.default = {};
  
  },{}],54:[function(require,module,exports){
  'use strict';
  
  Object.defineProperty(exports, "__esModule", {
      value: true
  });
  exports.getters = exports.actions = exports.state = undefined;
  
  var _vue = require('vue');
  
  var _vue2 = _interopRequireDefault(_vue);
  
  var _vuex = require('vuex');
  
  var _vuex2 = _interopRequireDefault(_vuex);
  
  var _mutations = require('./mutations');
  
  var mutations = _interopRequireWildcard(_mutations);
  
  var _Users = require('./modules/Users');
  
  var _Users2 = _interopRequireDefault(_Users);
  
  var _Forms = require('./modules/Forms');
  
  var _Forms2 = _interopRequireDefault(_Forms);
  
  function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  /* eslint-disable no-shadow */
  _vue2.default.use(_vuex2.default);
  
  // import * as actions from './actions';
  var state = exports.state = {
      status: {},
      page: { loading: true, loaded: false, errors: [], message: '' },
      config: require('./config')
  
      /** Don't Chane Me Regex Target For Templating Vue Store */
  };
  
  /**
   * Global actions
   */
  var actions = exports.actions = {};
  
  /**
   * Global getters
   */
  var getters = exports.getters = {};
  
  exports.default = new _vuex2.default.Store({
      state: state,
      actions: actions,
      mutations: mutations,
      getters: getters,
      modules: {
          user: _Users2.default,
          users: _Users2.default,
          form: _Forms2.default,
          forms: _Forms2.default
      }
  });
  
  },{"./config":53,"./modules/Forms":55,"./modules/Users":56,"./mutations":57,"vue":36,"vuex":37}],55:[function(require,module,exports){
  "use strict";
  
  Object.defineProperty(exports, "__esModule", {
      value: true
  });
  var actions = exports.actions = {
      getDefault: function getDefault() {
          return {
              name: "",
              email: ""
          };
      },
      initializeModule: function initializeModule() {
          return {
              name: "",
              email: ""
          };
      }
  };
  exports.default = {
      namespaced: true,
      state: function state() {
          return [actions.getDefault()];
      },
  
      actions: actions
  };
  
  },{}],56:[function(require,module,exports){
  'use strict';
  
  Object.defineProperty(exports, "__esModule", {
      value: true
  });
  exports.mutations = exports.actions = exports.getters = undefined;
  
  var _axios = require('axios');
  
  var _axios2 = _interopRequireDefault(_axios);
  
  var _lodash = require('lodash');
  
  var _lodash2 = _interopRequireDefault(_lodash);
  
  var _uriTemplates = require('uri-templates');
  
  var _uriTemplates2 = _interopRequireDefault(_uriTemplates);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  var namespaced = true;
  
  var _state = {
      user: {},
      errors: []
  };
  
  var getters = exports.getters = {};
  var actions = exports.actions = {};
  var mutations = exports.mutations = {};
  
  exports.default = {
      namespaced: namespaced,
      state: function state() {
          return _state.user;
      },
  
      getters: getters,
      actions: actions,
      mutations: mutations
  };
  
  },{"axios":1,"lodash":28,"uri-templates":34}],57:[function(require,module,exports){
  'use strict';
  
  Object.defineProperty(exports, "__esModule", {
      value: true
  });
  exports.READ_URL_PARAMETERS = exports.ADD_MODAL = exports.ADD_ALERT = exports.SET_SETTINGS_STYLE = exports.SET_BREADCRUMBS = exports.SET_PAGE_MESSAGE = exports.SET_PAGE_STATUS = exports.SET_STATUS = exports.ADD_STATUS = exports.UPDATE_LOOKUP_RESOURCE = exports.UPDATE_LOOKUP_FIELD = exports.CLEAR_RESOURCE = exports.PUSH_INTO_RESOURCE = exports.ADD_PROPERTY_TO_STORE = exports.updateResource_BY_INDEX = exports.UPDATE_SUBRESOURCE_BY_INDEX = exports.sync = exports.updateModuleField = exports.updateModuleResource = exports.updateResourceStatus = exports.updateResource = exports.setState = exports.UPDATE = undefined;
  
  var _vue = require('vue');
  
  var _vue2 = _interopRequireDefault(_vue);
  
  var _queryString = require('query-string');
  
  var _queryString2 = _interopRequireDefault(_queryString);
  
  var _lodash = require('lodash');
  
  var _lodash2 = _interopRequireDefault(_lodash);
  
  var _uriTemplates = require('uri-templates');
  
  var _uriTemplates2 = _interopRequireDefault(_uriTemplates);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  var UPDATE = exports.UPDATE = function UPDATE(state, _ref) {
      var module = _ref.module,
          resource = _ref.resource,
          field = _ref.field,
          value = _ref.value,
          resourceData = _ref.resourceData,
          defaultValue = _ref.defaultValue;
  
      if (!defaultValue) {
          defaultValue = ''; // eslint-disable-line no-param-reassign
      }
  
      if (state[module][resource] === undefined) {
          _vue2.default.log.debug('setting resource');
          _vue2.default.set(state[module], resource, resourceData || {});
      }
      /**
       * Passing resourceData overrides everything sets the resource and returns.
       */
      if (resourceData) {
          _vue2.default.log.debug('setting resource default');
          state[module][resource] = resourceData;
          return;
      }
  
      /**
       * If we included a field value but is undefined in the store create it...
       */
      if (field && state[module][resource][field] === undefined) {
          _vue2.default.log.debug('setting field and default');
          _vue2.default.set(state[module][resource], field, defaultValue);
      }
  
      /**
       * Are we trying to set this field to a value, if so do it...
       */
      if (value !== undefined) {
          state[module][resource][field] = value;
      }
  };
  var setState = exports.setState = function setState(state, storeState) {
      for (var prop in storeState) {
          state[prop] = storeState[prop];
      }
  };
  
  var updateResource = exports.updateResource = function updateResource(state, _ref2) {
      var resource = _ref2.resource,
          value = _ref2.value;
  
      state[resource] = value;
  };
  
  var updateResourceStatus = exports.updateResourceStatus = function updateResourceStatus(state, _ref3) {
      var resource = _ref3.resource,
          value = _ref3.value;
  
      state.status[resource] = value;
  };
  
  var updateModuleResource = exports.updateModuleResource = function updateModuleResource(state, _ref4) {
      var module = _ref4.module,
          resource = _ref4.resource,
          value = _ref4.value;
  
      state[module][resource] = value;
  };
  
  var updateModuleField = exports.updateModuleField = function updateModuleField(state, _ref5) {
      var module = _ref5.module,
          resource = _ref5.resource,
          field = _ref5.field,
          value = _ref5.value;
  
      if (state[module][resource][field] === undefined) {
          _vue2.default.set(state[module][resource], field, value);
  
          return;
      }
  
      state[module][resource][field] = value;
  };
  
  var sync = exports.sync = function sync(state, _ref6) {
      var object = _ref6.object,
          value = _ref6.value;
  
      object = value;
  };
  
  var UPDATE_SUBRESOURCE_BY_INDEX = exports.UPDATE_SUBRESOURCE_BY_INDEX = function UPDATE_SUBRESOURCE_BY_INDEX(state, _ref7) {
      var module = _ref7.module,
          resource = _ref7.resource,
          field = _ref7.field,
          index = _ref7.index,
          sub_field = _ref7.sub_field,
          value = _ref7.value;
  
      state[module][resource][field][index][sub_field] = value;
  };
  
  var updateResource_BY_INDEX = exports.updateResource_BY_INDEX = function updateResource_BY_INDEX(state, _ref8) {
      var module = _ref8.module,
          resource = _ref8.resource,
          index = _ref8.index,
          field = _ref8.field,
          value = _ref8.value;
  
      state[module][resource][index][field] = value;
  };
  
  var ADD_PROPERTY_TO_STORE = exports.ADD_PROPERTY_TO_STORE = function ADD_PROPERTY_TO_STORE(state, _ref9) {
      var module = _ref9.module,
          resource = _ref9.resource,
          field = _ref9.field,
          initialValue = _ref9.initialValue;
  
      _vue2.default.log.debug('add property to store');
      var value = initialValue || '';
      _vue2.default.set(state[module][resource], field, value);
  };
  
  var PUSH_INTO_RESOURCE = exports.PUSH_INTO_RESOURCE = function PUSH_INTO_RESOURCE(state, _ref10) {
      var module = _ref10.module,
          resource = _ref10.resource,
          value = _ref10.value;
  
      state[module][resource].push(value);
  };
  
  var CLEAR_RESOURCE = exports.CLEAR_RESOURCE = function CLEAR_RESOURCE(state, _ref11) {
      var module = _ref11.module,
          resource = _ref11.resource;
  
      _vue2.default.set(state[module], resource, {});
  };
  
  var UPDATE_LOOKUP_FIELD = exports.UPDATE_LOOKUP_FIELD = function UPDATE_LOOKUP_FIELD(state, _ref12) {
      var path = _ref12.path,
          field = _ref12.field,
          value = _ref12.value;
  
      var reference = path.split('.').reduce(function (obj, index) {
          return obj[index];
      }, state);
  
      if (reference && reference[field]) {
          _vue2.default.log.debug('setting lookup value:' + value + ' on:' + field + ' at:' + path);
          reference[field] = value;
      }
  };
  
  var UPDATE_LOOKUP_RESOURCE = exports.UPDATE_LOOKUP_RESOURCE = function UPDATE_LOOKUP_RESOURCE(state, _ref13) {
      var path = _ref13.path,
          value = _ref13.value;
  
      var reference = path.split('.').reduce(function (obj, index) {
          return obj[index];
      }, state); // eslint-disable-line no-unused-vars
  
      reference = value;
  };
  
  var ADD_STATUS = exports.ADD_STATUS = function ADD_STATUS(state, resource) {
      _vue2.default.set(state.status, resource, { loading: false, loaded: false, errors: [] });
  };
  
  var SET_STATUS = exports.SET_STATUS = function SET_STATUS(state, _ref14) {
      var resource = _ref14.resource,
          loading = _ref14.loading,
          loaded = _ref14.loaded,
          errors = _ref14.errors;
  
      state.status[resource].loading = loading !== undefined ? loading : state.status[resource].loading;
      state.status[resource].loaded = loaded !== undefined ? loaded : state.status[resource].loaded;
      state.status[resource].errors = errors !== undefined ? errors : state.status[resource].errors;
  };
  
  var SET_PAGE_STATUS = exports.SET_PAGE_STATUS = function SET_PAGE_STATUS(state, _ref15) {
      var loading = _ref15.loading,
          loaded = _ref15.loaded,
          errors = _ref15.errors;
  
      state.page.loading = loading !== undefined ? loading : state.page.loading;
      state.page.loaded = loaded !== undefined ? loaded : state.page.loaded;
      state.page.errors = errors !== undefined ? errors : state.page.errors;
  };
  
  var SET_PAGE_MESSAGE = exports.SET_PAGE_MESSAGE = function SET_PAGE_MESSAGE(state, message) {
      _vue2.default.log.debug('set page message');
      state.page.message = message;
  };
  
  var SET_BREADCRUMBS = exports.SET_BREADCRUMBS = function SET_BREADCRUMBS(state, _ref16) {
      var links = _ref16.links,
          settings = _ref16.settings;
  
      state.breadcrumbs.links = links;
      state.breadcrumbs.settings = settings;
  };
  
  var SET_SETTINGS_STYLE = exports.SET_SETTINGS_STYLE = function SET_SETTINGS_STYLE(state, _ref17) {
      var icon_class = _ref17.icon_class,
          button_class = _ref17.button_class,
          label = _ref17.label;
  
      state.breadcrumbs.settings.icon_class = icon_class;
      state.breadcrumbs.settings.button_class = button_class;
      state.breadcrumbs.settings.label = label;
  };
  
  var ADD_ALERT = exports.ADD_ALERT = function ADD_ALERT(state, alert) {
      state.alerts.push(alert);
  };
  
  var ADD_MODAL = exports.ADD_MODAL = function ADD_MODAL(state, modal) {
      state.modal = modal;
  };
  
  var READ_URL_PARAMETERS = exports.READ_URL_PARAMETERS = function READ_URL_PARAMETERS(state) {
      state.url.search = _queryString2.default.parse(location.search);
      state.url.hash = _queryString2.default.parse(location.hash);
  };
  
  },{"lodash":28,"query-string":31,"uri-templates":34,"vue":36}]},{},[38]);
  
  //# sourceMappingURL=app.js.map
  