text: ﻿/**
   * @license
   * Lodash <https://lodash.com/>
   * Copyright OpenJS Foundation and other contributors <https://openjsf.org/>
   * 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 = '4.17.15';
  
      /** 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*$/,
          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|[A-Z_])',
          rsOrdUpper = '\\d*(?:1ST|2ND|3RD|(?![123])\\dTH)(?=\\b|[a-z_])',
          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 {
              // Use `util.types` for Node.js 10+.
              var types = freeModule && freeModule.require && freeModule.require('util').types;
  
              if (types) {
                  return types;
              }
  
              // Legacy `process.binding('util')` for Node.js < 10.
              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;
  
      /*--------------------------------------------------------------------------*/
  
      /**
       * 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, 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);
  
              if (isSet(value)) {
                  value.forEach(function (subValue) {
                      result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack));
                  });
              } else if (isMap(value)) {
                  value.forEach(function (subValue, key) {
                      result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack));
                  });
              }
  
              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) {
                  stack || (stack = new Stack);
                  if (isObject(srcValue)) {
                      baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
                  }
                  else {
                      var newValue = customizer
                          ? customizer(safeGet(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 = safeGet(object, key),
                  srcValue = safeGet(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) || 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 `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 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 && nativeIsFinite(number)) {
                      // 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 = new 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`, `Map`, `Number`, `RegExp`, `Set`, or `String`.
           *
           * @private
           * @param {Object} object The object to clone.
           * @param {string} tag The `toStringTag` of the object to clone.
           * @param {boolean} [isDeep] Specify a deep clone.
           * @returns {Object} Returns the initialized clone.
           */
          function initCloneByTag(object, tag, 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 new Ctor;
  
                  case numberTag:
                  case stringTag:
                      return new Ctor(object);
  
                  case regexpTag:
                      return cloneRegExp(object);
  
                  case setTag:
                      return new Ctor;
  
                  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) {
              var type = typeof value;
              length = length == null ? MAX_SAFE_INTEGER : length;
  
              return !!length &&
                  (type == 'number' ||
                      (type != 'symbol' && 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;
          }
  
          /**
           * Gets the value at `key`, unless `key` is "__proto__" or "constructor".
           *
           * @private
           * @param {Object} object The object to query.
           * @param {string} key The key of the property to get.
           * @returns {*} Returns the property value.
           */
          function safeGet(object, key) {
              if (key === 'constructor' && typeof object[key] === 'function') {
                  return;
              }
  
              if (key == '__proto__') {
                  return;
              }
  
              return object[key];
          }
  
          /**
           * 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 (string.charCodeAt(0) === 46 /* . */) {
                  result.push('');
              }
              string.replace(rePropName, function (match, number, quote, subString) {
                  result.push(quote ? subString.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,
                      timeWaiting = wait - timeSinceLastCall;
  
                  return maxing
                      ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)
                      : timeWaiting;
              }
  
              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.
                          clearTimeout(timerId);
                          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 (object, sources) {
              object = Object(object);
  
              var index = -1;
              var length = sources.length;
              var guard = length > 2 ? sources[2] : undefined;
  
              if (guard && isIterateeCall(sources[0], sources[1], guard)) {
                  length = 1;
              }
  
              while (++index < length) {
                  var source = sources[index];
                  var props = keysIn(source);
                  var propsIndex = -1;
                  var propsLength = props.length;
  
                  while (++propsIndex < propsLength) {
                      var key = props[propsIndex];
                      var value = object[key];
  
                      if (value === undefined ||
                          (eq(value, objectProto[key]) && !hasOwnProperty.call(object, key))) {
                          object[key] = source[key];
                      }
                  }
              }
  
              return object;
          });
  
          /**
           * 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) {
              if (value != null &&
                  typeof value.toString != 'function') {
                  value = nativeObjectToString.call(value);
              }
  
              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 (value != null &&
                  typeof value.toString != 'function') {
                  value = nativeObjectToString.call(value);
              }
  
              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.
              // The sourceURL gets injected into the source that's eval-ed, so be careful
              // with lookup (in case of e.g. prototype pollution), and strip newlines if any.
              // A newline wouldn't be a valid sourceURL anyway, and it'd enable code injection.
              var sourceURL = '//# sourceURL=' +
                  (hasOwnProperty.call(options, 'sourceURL')
                      ? (options.sourceURL + '').replace(/[\r\n]/g, ' ')
                      : ('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.
              // Like with sourceURL, we take care to not check the option's prototype,
              // as this configuration is a code injection vector.
              var variable = hasOwnProperty.call(options, '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 + '';
                  if (!hasOwnProperty.call(realNames, key)) {
                      realNames[key] = [];
                  }
                  realNames[key].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));
  