text: (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.nj = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
  'use strict'
  
  exports.byteLength = byteLength
  exports.toByteArray = toByteArray
  exports.fromByteArray = fromByteArray
  
  var lookup = []
  var revLookup = []
  var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
  
  var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
  for (var i = 0, len = code.length; i < len; ++i) {
    lookup[i] = code[i]
    revLookup[code.charCodeAt(i)] = i
  }
  
  revLookup['-'.charCodeAt(0)] = 62
  revLookup['_'.charCodeAt(0)] = 63
  
  function placeHoldersCount (b64) {
    var len = b64.length
    if (len % 4 > 0) {
      throw new Error('Invalid string. Length must be a multiple of 4')
    }
  
    // the number of equal signs (place holders)
    // if there are two placeholders, than the two characters before it
    // represent one byte
    // if there is only one, then the three characters before it represent 2 bytes
    // this is just a cheap hack to not do indexOf twice
    return b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0
  }
  
  function byteLength (b64) {
    // base64 is 4/3 + up to two characters of the original data
    return b64.length * 3 / 4 - placeHoldersCount(b64)
  }
  
  function toByteArray (b64) {
    var i, j, l, tmp, placeHolders, arr
    var len = b64.length
    placeHolders = placeHoldersCount(b64)
  
    arr = new Arr(len * 3 / 4 - placeHolders)
  
    // if there are placeholders, only get up to the last complete 4 chars
    l = placeHolders > 0 ? len - 4 : len
  
    var L = 0
  
    for (i = 0, j = 0; i < l; i += 4, j += 3) {
      tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]
      arr[L++] = (tmp >> 16) & 0xFF
      arr[L++] = (tmp >> 8) & 0xFF
      arr[L++] = tmp & 0xFF
    }
  
    if (placeHolders === 2) {
      tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)
      arr[L++] = tmp & 0xFF
    } else if (placeHolders === 1) {
      tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)
      arr[L++] = (tmp >> 8) & 0xFF
      arr[L++] = tmp & 0xFF
    }
  
    return arr
  }
  
  function tripletToBase64 (num) {
    return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
  }
  
  function encodeChunk (uint8, start, end) {
    var tmp
    var output = []
    for (var i = start; i < end; i += 3) {
      tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
      output.push(tripletToBase64(tmp))
    }
    return output.join('')
  }
  
  function fromByteArray (uint8) {
    var tmp
    var len = uint8.length
    var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
    var output = ''
    var parts = []
    var maxChunkLength = 16383 // must be multiple of 3
  
    // go through the array every three bytes, we'll deal with trailing stuff later
    for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
      parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
    }
  
    // pad the end with zeros, but make sure to not forget the extra bytes
    if (extraBytes === 1) {
      tmp = uint8[len - 1]
      output += lookup[tmp >> 2]
      output += lookup[(tmp << 4) & 0x3F]
      output += '=='
    } else if (extraBytes === 2) {
      tmp = (uint8[len - 2] << 8) + (uint8[len - 1])
      output += lookup[tmp >> 10]
      output += lookup[(tmp >> 4) & 0x3F]
      output += lookup[(tmp << 2) & 0x3F]
      output += '='
    }
  
    parts.push(output)
  
    return parts.join('')
  }
  
  },{}],2:[function(require,module,exports){
  /**
   * Bit twiddling hacks for JavaScript.
   *
   * Author: Mikola Lysenko
   *
   * Ported from Stanford bit twiddling hack library:
   *    http://graphics.stanford.edu/~seander/bithacks.html
   */
  
  "use strict"; "use restrict";
  
  //Number of bits in an integer
  var INT_BITS = 32;
  
  //Constants
  exports.INT_BITS  = INT_BITS;
  exports.INT_MAX   =  0x7fffffff;
  exports.INT_MIN   = -1<<(INT_BITS-1);
  
  //Returns -1, 0, +1 depending on sign of x
  exports.sign = function(v) {
    return (v > 0) - (v < 0);
  }
  
  //Computes absolute value of integer
  exports.abs = function(v) {
    var mask = v >> (INT_BITS-1);
    return (v ^ mask) - mask;
  }
  
  //Computes minimum of integers x and y
  exports.min = function(x, y) {
    return y ^ ((x ^ y) & -(x < y));
  }
  
  //Computes maximum of integers x and y
  exports.max = function(x, y) {
    return x ^ ((x ^ y) & -(x < y));
  }
  
  //Checks if a number is a power of two
  exports.isPow2 = function(v) {
    return !(v & (v-1)) && (!!v);
  }
  
  //Computes log base 2 of v
  exports.log2 = function(v) {
    var r, shift;
    r =     (v > 0xFFFF) << 4; v >>>= r;
    shift = (v > 0xFF  ) << 3; v >>>= shift; r |= shift;
    shift = (v > 0xF   ) << 2; v >>>= shift; r |= shift;
    shift = (v > 0x3   ) << 1; v >>>= shift; r |= shift;
    return r | (v >> 1);
  }
  
  //Computes log base 10 of v
  exports.log10 = function(v) {
    return  (v >= 1000000000) ? 9 : (v >= 100000000) ? 8 : (v >= 10000000) ? 7 :
            (v >= 1000000) ? 6 : (v >= 100000) ? 5 : (v >= 10000) ? 4 :
            (v >= 1000) ? 3 : (v >= 100) ? 2 : (v >= 10) ? 1 : 0;
  }
  
  //Counts number of bits
  exports.popCount = function(v) {
    v = v - ((v >>> 1) & 0x55555555);
    v = (v & 0x33333333) + ((v >>> 2) & 0x33333333);
    return ((v + (v >>> 4) & 0xF0F0F0F) * 0x1010101) >>> 24;
  }
  
  //Counts number of trailing zeros
  function countTrailingZeros(v) {
    var c = 32;
    v &= -v;
    if (v) c--;
    if (v & 0x0000FFFF) c -= 16;
    if (v & 0x00FF00FF) c -= 8;
    if (v & 0x0F0F0F0F) c -= 4;
    if (v & 0x33333333) c -= 2;
    if (v & 0x55555555) c -= 1;
    return c;
  }
  exports.countTrailingZeros = countTrailingZeros;
  
  //Rounds to next power of 2
  exports.nextPow2 = function(v) {
    v += v === 0;
    --v;
    v |= v >>> 1;
    v |= v >>> 2;
    v |= v >>> 4;
    v |= v >>> 8;
    v |= v >>> 16;
    return v + 1;
  }
  
  //Rounds down to previous power of 2
  exports.prevPow2 = function(v) {
    v |= v >>> 1;
    v |= v >>> 2;
    v |= v >>> 4;
    v |= v >>> 8;
    v |= v >>> 16;
    return v - (v>>>1);
  }
  
  //Computes parity of word
  exports.parity = function(v) {
    v ^= v >>> 16;
    v ^= v >>> 8;
    v ^= v >>> 4;
    v &= 0xf;
    return (0x6996 >>> v) & 1;
  }
  
  var REVERSE_TABLE = new Array(256);
  
  (function(tab) {
    for(var i=0; i<256; ++i) {
      var v = i, r = i, s = 7;
      for (v >>>= 1; v; v >>>= 1) {
        r <<= 1;
        r |= v & 1;
        --s;
      }
      tab[i] = (r << s) & 0xff;
    }
  })(REVERSE_TABLE);
  
  //Reverse bits in a 32 bit word
  exports.reverse = function(v) {
    return  (REVERSE_TABLE[ v         & 0xff] << 24) |
            (REVERSE_TABLE[(v >>> 8)  & 0xff] << 16) |
            (REVERSE_TABLE[(v >>> 16) & 0xff] << 8)  |
             REVERSE_TABLE[(v >>> 24) & 0xff];
  }
  
  //Interleave bits of 2 coordinates with 16 bits.  Useful for fast quadtree codes
  exports.interleave2 = function(x, y) {
    x &= 0xFFFF;
    x = (x | (x << 8)) & 0x00FF00FF;
    x = (x | (x << 4)) & 0x0F0F0F0F;
    x = (x | (x << 2)) & 0x33333333;
    x = (x | (x << 1)) & 0x55555555;
  
    y &= 0xFFFF;
    y = (y | (y << 8)) & 0x00FF00FF;
    y = (y | (y << 4)) & 0x0F0F0F0F;
    y = (y | (y << 2)) & 0x33333333;
    y = (y | (y << 1)) & 0x55555555;
  
    return x | (y << 1);
  }
  
  //Extracts the nth interleaved component
  exports.deinterleave2 = function(v, n) {
    v = (v >>> n) & 0x55555555;
    v = (v | (v >>> 1))  & 0x33333333;
    v = (v | (v >>> 2))  & 0x0F0F0F0F;
    v = (v | (v >>> 4))  & 0x00FF00FF;
    v = (v | (v >>> 16)) & 0x000FFFF;
    return (v << 16) >> 16;
  }
  
  
  //Interleave bits of 3 coordinates, each with 10 bits.  Useful for fast octree codes
  exports.interleave3 = function(x, y, z) {
    x &= 0x3FF;
    x  = (x | (x<<16)) & 4278190335;
    x  = (x | (x<<8))  & 251719695;
    x  = (x | (x<<4))  & 3272356035;
    x  = (x | (x<<2))  & 1227133513;
  
    y &= 0x3FF;
    y  = (y | (y<<16)) & 4278190335;
    y  = (y | (y<<8))  & 251719695;
    y  = (y | (y<<4))  & 3272356035;
    y  = (y | (y<<2))  & 1227133513;
    x |= (y << 1);
    
    z &= 0x3FF;
    z  = (z | (z<<16)) & 4278190335;
    z  = (z | (z<<8))  & 251719695;
    z  = (z | (z<<4))  & 3272356035;
    z  = (z | (z<<2))  & 1227133513;
    
    return x | (z << 2);
  }
  
  //Extracts nth interleaved component of a 3-tuple
  exports.deinterleave3 = function(v, n) {
    v = (v >>> n)       & 1227133513;
    v = (v | (v>>>2))   & 3272356035;
    v = (v | (v>>>4))   & 251719695;
    v = (v | (v>>>8))   & 4278190335;
    v = (v | (v>>>16))  & 0x3FF;
    return (v<<22)>>22;
  }
  
  //Computes next combination in colexicographic order (this is mistakenly called nextPermutation on the bit twiddling hacks page)
  exports.nextCombination = function(v) {
    var t = v | (v - 1);
    return (t + 1) | (((~t & -~t) - 1) >>> (countTrailingZeros(v) + 1));
  }
  
  
  },{}],3:[function(require,module,exports){
  (function (global){
  /*!
   * The buffer module from node.js, for the browser.
   *
   * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
   * @license  MIT
   */
  /* eslint-disable no-proto */
  
  'use strict'
  
  var base64 = require('base64-js')
  var ieee754 = require('ieee754')
  var isArray = require('isarray')
  
  exports.Buffer = Buffer
  exports.SlowBuffer = SlowBuffer
  exports.INSPECT_MAX_BYTES = 50
  
  /**
   * If `Buffer.TYPED_ARRAY_SUPPORT`:
   *   === true    Use Uint8Array implementation (fastest)
   *   === false   Use Object implementation (most compatible, even IE6)
   *
   * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
   * Opera 11.6+, iOS 4.2+.
   *
   * Due to various browser bugs, sometimes the Object implementation will be used even
   * when the browser supports typed arrays.
   *
   * Note:
   *
   *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
   *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
   *
   *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
   *
   *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
   *     incorrect length in some situations.
  
   * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
   * get the Object implementation, which is slower but behaves correctly.
   */
  Buffer.TYPED_ARRAY_SUPPORT = global.TYPED_ARRAY_SUPPORT !== undefined
    ? global.TYPED_ARRAY_SUPPORT
    : typedArraySupport()
  
  /*
   * Export kMaxLength after typed array support is determined.
   */
  exports.kMaxLength = kMaxLength()
  
  function typedArraySupport () {
    try {
      var arr = new Uint8Array(1)
      arr.__proto__ = {__proto__: Uint8Array.prototype, foo: function () { return 42 }}
      return arr.foo() === 42 && // typed array instances can be augmented
          typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
          arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
    } catch (e) {
      return false
    }
  }
  
  function kMaxLength () {
    return Buffer.TYPED_ARRAY_SUPPORT
      ? 0x7fffffff
      : 0x3fffffff
  }
  
  function createBuffer (that, length) {
    if (kMaxLength() < length) {
      throw new RangeError('Invalid typed array length')
    }
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      // Return an augmented `Uint8Array` instance, for best performance
      that = new Uint8Array(length)
      that.__proto__ = Buffer.prototype
    } else {
      // Fallback: Return an object instance of the Buffer class
      if (that === null) {
        that = new Buffer(length)
      }
      that.length = length
    }
  
    return that
  }
  
  /**
   * The Buffer constructor returns instances of `Uint8Array` that have their
   * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
   * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
   * and the `Uint8Array` methods. Square bracket notation works as expected -- it
   * returns a single octet.
   *
   * The `Uint8Array` prototype remains unmodified.
   */
  
  function Buffer (arg, encodingOrOffset, length) {
    if (!Buffer.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer)) {
      return new Buffer(arg, encodingOrOffset, length)
    }
  
    // Common case.
    if (typeof arg === 'number') {
      if (typeof encodingOrOffset === 'string') {
        throw new Error(
          'If encoding is specified then the first argument must be a string'
        )
      }
      return allocUnsafe(this, arg)
    }
    return from(this, arg, encodingOrOffset, length)
  }
  
  Buffer.poolSize = 8192 // not used by this implementation
  
  // TODO: Legacy, not needed anymore. Remove in next major version.
  Buffer._augment = function (arr) {
    arr.__proto__ = Buffer.prototype
    return arr
  }
  
  function from (that, value, encodingOrOffset, length) {
    if (typeof value === 'number') {
      throw new TypeError('"value" argument must not be a number')
    }
  
    if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
      return fromArrayBuffer(that, value, encodingOrOffset, length)
    }
  
    if (typeof value === 'string') {
      return fromString(that, value, encodingOrOffset)
    }
  
    return fromObject(that, value)
  }
  
  /**
   * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
   * if value is a number.
   * Buffer.from(str[, encoding])
   * Buffer.from(array)
   * Buffer.from(buffer)
   * Buffer.from(arrayBuffer[, byteOffset[, length]])
   **/
  Buffer.from = function (value, encodingOrOffset, length) {
    return from(null, value, encodingOrOffset, length)
  }
  
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    Buffer.prototype.__proto__ = Uint8Array.prototype
    Buffer.__proto__ = Uint8Array
    if (typeof Symbol !== 'undefined' && Symbol.species &&
        Buffer[Symbol.species] === Buffer) {
      // Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
      Object.defineProperty(Buffer, Symbol.species, {
        value: null,
        configurable: true
      })
    }
  }
  
  function assertSize (size) {
    if (typeof size !== 'number') {
      throw new TypeError('"size" argument must be a number')
    } else if (size < 0) {
      throw new RangeError('"size" argument must not be negative')
    }
  }
  
  function alloc (that, size, fill, encoding) {
    assertSize(size)
    if (size <= 0) {
      return createBuffer(that, size)
    }
    if (fill !== undefined) {
      // Only pay attention to encoding if it's a string. This
      // prevents accidentally sending in a number that would
      // be interpretted as a start offset.
      return typeof encoding === 'string'
        ? createBuffer(that, size).fill(fill, encoding)
        : createBuffer(that, size).fill(fill)
    }
    return createBuffer(that, size)
  }
  
  /**
   * Creates a new filled Buffer instance.
   * alloc(size[, fill[, encoding]])
   **/
  Buffer.alloc = function (size, fill, encoding) {
    return alloc(null, size, fill, encoding)
  }
  
  function allocUnsafe (that, size) {
    assertSize(size)
    that = createBuffer(that, size < 0 ? 0 : checked(size) | 0)
    if (!Buffer.TYPED_ARRAY_SUPPORT) {
      for (var i = 0; i < size; ++i) {
        that[i] = 0
      }
    }
    return that
  }
  
  /**
   * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
   * */
  Buffer.allocUnsafe = function (size) {
    return allocUnsafe(null, size)
  }
  /**
   * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
   */
  Buffer.allocUnsafeSlow = function (size) {
    return allocUnsafe(null, size)
  }
  
  function fromString (that, string, encoding) {
    if (typeof encoding !== 'string' || encoding === '') {
      encoding = 'utf8'
    }
  
    if (!Buffer.isEncoding(encoding)) {
      throw new TypeError('"encoding" must be a valid string encoding')
    }
  
    var length = byteLength(string, encoding) | 0
    that = createBuffer(that, length)
  
    var actual = that.write(string, encoding)
  
    if (actual !== length) {
      // Writing a hex string, for example, that contains invalid characters will
      // cause everything after the first invalid character to be ignored. (e.g.
      // 'abxxcd' will be treated as 'ab')
      that = that.slice(0, actual)
    }
  
    return that
  }
  
  function fromArrayLike (that, array) {
    var length = array.length < 0 ? 0 : checked(array.length) | 0
    that = createBuffer(that, length)
    for (var i = 0; i < length; i += 1) {
      that[i] = array[i] & 255
    }
    return that
  }
  
  function fromArrayBuffer (that, array, byteOffset, length) {
    array.byteLength // this throws if `array` is not a valid ArrayBuffer
  
    if (byteOffset < 0 || array.byteLength < byteOffset) {
      throw new RangeError('\'offset\' is out of bounds')
    }
  
    if (array.byteLength < byteOffset + (length || 0)) {
      throw new RangeError('\'length\' is out of bounds')
    }
  
    if (byteOffset === undefined && length === undefined) {
      array = new Uint8Array(array)
    } else if (length === undefined) {
      array = new Uint8Array(array, byteOffset)
    } else {
      array = new Uint8Array(array, byteOffset, length)
    }
  
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      // Return an augmented `Uint8Array` instance, for best performance
      that = array
      that.__proto__ = Buffer.prototype
    } else {
      // Fallback: Return an object instance of the Buffer class
      that = fromArrayLike(that, array)
    }
    return that
  }
  
  function fromObject (that, obj) {
    if (Buffer.isBuffer(obj)) {
      var len = checked(obj.length) | 0
      that = createBuffer(that, len)
  
      if (that.length === 0) {
        return that
      }
  
      obj.copy(that, 0, 0, len)
      return that
    }
  
    if (obj) {
      if ((typeof ArrayBuffer !== 'undefined' &&
          obj.buffer instanceof ArrayBuffer) || 'length' in obj) {
        if (typeof obj.length !== 'number' || isnan(obj.length)) {
          return createBuffer(that, 0)
        }
        return fromArrayLike(that, obj)
      }
  
      if (obj.type === 'Buffer' && isArray(obj.data)) {
        return fromArrayLike(that, obj.data)
      }
    }
  
    throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')
  }
  
  function checked (length) {
    // Note: cannot use `length < kMaxLength()` here because that fails when
    // length is NaN (which is otherwise coerced to zero.)
    if (length >= kMaxLength()) {
      throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                           'size: 0x' + kMaxLength().toString(16) + ' bytes')
    }
    return length | 0
  }
  
  function SlowBuffer (length) {
    if (+length != length) { // eslint-disable-line eqeqeq
      length = 0
    }
    return Buffer.alloc(+length)
  }
  
  Buffer.isBuffer = function isBuffer (b) {
    return !!(b != null && b._isBuffer)
  }
  
  Buffer.compare = function compare (a, b) {
    if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
      throw new TypeError('Arguments must be Buffers')
    }
  
    if (a === b) return 0
  
    var x = a.length
    var y = b.length
  
    for (var i = 0, len = Math.min(x, y); i < len; ++i) {
      if (a[i] !== b[i]) {
        x = a[i]
        y = b[i]
        break
      }
    }
  
    if (x < y) return -1
    if (y < x) return 1
    return 0
  }
  
  Buffer.isEncoding = function isEncoding (encoding) {
    switch (String(encoding).toLowerCase()) {
      case 'hex':
      case 'utf8':
      case 'utf-8':
      case 'ascii':
      case 'latin1':
      case 'binary':
      case 'base64':
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return true
      default:
        return false
    }
  }
  
  Buffer.concat = function concat (list, length) {
    if (!isArray(list)) {
      throw new TypeError('"list" argument must be an Array of Buffers')
    }
  
    if (list.length === 0) {
      return Buffer.alloc(0)
    }
  
    var i
    if (length === undefined) {
      length = 0
      for (i = 0; i < list.length; ++i) {
        length += list[i].length
      }
    }
  
    var buffer = Buffer.allocUnsafe(length)
    var pos = 0
    for (i = 0; i < list.length; ++i) {
      var buf = list[i]
      if (!Buffer.isBuffer(buf)) {
        throw new TypeError('"list" argument must be an Array of Buffers')
      }
      buf.copy(buffer, pos)
      pos += buf.length
    }
    return buffer
  }
  
  function byteLength (string, encoding) {
    if (Buffer.isBuffer(string)) {
      return string.length
    }
    if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' &&
        (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) {
      return string.byteLength
    }
    if (typeof string !== 'string') {
      string = '' + string
    }
  
    var len = string.length
    if (len === 0) return 0
  
    // Use a for loop to avoid recursion
    var loweredCase = false
    for (;;) {
      switch (encoding) {
        case 'ascii':
        case 'latin1':
        case 'binary':
          return len
        case 'utf8':
        case 'utf-8':
        case undefined:
          return utf8ToBytes(string).length
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return len * 2
        case 'hex':
          return len >>> 1
        case 'base64':
          return base64ToBytes(string).length
        default:
          if (loweredCase) return utf8ToBytes(string).length // assume utf8
          encoding = ('' + encoding).toLowerCase()
          loweredCase = true
      }
    }
  }
  Buffer.byteLength = byteLength
  
  function slowToString (encoding, start, end) {
    var loweredCase = false
  
    // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
    // property of a typed array.
  
    // This behaves neither like String nor Uint8Array in that we set start/end
    // to their upper/lower bounds if the value passed is out of range.
    // undefined is handled specially as per ECMA-262 6th Edition,
    // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
    if (start === undefined || start < 0) {
      start = 0
    }
    // Return early if start > this.length. Done here to prevent potential uint32
    // coercion fail below.
    if (start > this.length) {
      return ''
    }
  
    if (end === undefined || end > this.length) {
      end = this.length
    }
  
    if (end <= 0) {
      return ''
    }
  
    // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
    end >>>= 0
    start >>>= 0
  
    if (end <= start) {
      return ''
    }
  
    if (!encoding) encoding = 'utf8'
  
    while (true) {
      switch (encoding) {
        case 'hex':
          return hexSlice(this, start, end)
  
        case 'utf8':
        case 'utf-8':
          return utf8Slice(this, start, end)
  
        case 'ascii':
          return asciiSlice(this, start, end)
  
        case 'latin1':
        case 'binary':
          return latin1Slice(this, start, end)
  
        case 'base64':
          return base64Slice(this, start, end)
  
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return utf16leSlice(this, start, end)
  
        default:
          if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
          encoding = (encoding + '').toLowerCase()
          loweredCase = true
      }
    }
  }
  
  // The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect
  // Buffer instances.
  Buffer.prototype._isBuffer = true
  
  function swap (b, n, m) {
    var i = b[n]
    b[n] = b[m]
    b[m] = i
  }
  
  Buffer.prototype.swap16 = function swap16 () {
    var len = this.length
    if (len % 2 !== 0) {
      throw new RangeError('Buffer size must be a multiple of 16-bits')
    }
    for (var i = 0; i < len; i += 2) {
      swap(this, i, i + 1)
    }
    return this
  }
  
  Buffer.prototype.swap32 = function swap32 () {
    var len = this.length
    if (len % 4 !== 0) {
      throw new RangeError('Buffer size must be a multiple of 32-bits')
    }
    for (var i = 0; i < len; i += 4) {
      swap(this, i, i + 3)
      swap(this, i + 1, i + 2)
    }
    return this
  }
  
  Buffer.prototype.swap64 = function swap64 () {
    var len = this.length
    if (len % 8 !== 0) {
      throw new RangeError('Buffer size must be a multiple of 64-bits')
    }
    for (var i = 0; i < len; i += 8) {
      swap(this, i, i + 7)
      swap(this, i + 1, i + 6)
      swap(this, i + 2, i + 5)
      swap(this, i + 3, i + 4)
    }
    return this
  }
  
  Buffer.prototype.toString = function toString () {
    var length = this.length | 0
    if (length === 0) return ''
    if (arguments.length === 0) return utf8Slice(this, 0, length)
    return slowToString.apply(this, arguments)
  }
  
  Buffer.prototype.equals = function equals (b) {
    if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
    if (this === b) return true
    return Buffer.compare(this, b) === 0
  }
  
  Buffer.prototype.inspect = function inspect () {
    var str = ''
    var max = exports.INSPECT_MAX_BYTES
    if (this.length > 0) {
      str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')
      if (this.length > max) str += ' ... '
    }
    return '<Buffer ' + str + '>'
  }
  
  Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
    if (!Buffer.isBuffer(target)) {
      throw new TypeError('Argument must be a Buffer')
    }
  
    if (start === undefined) {
      start = 0
    }
    if (end === undefined) {
      end = target ? target.length : 0
    }
    if (thisStart === undefined) {
      thisStart = 0
    }
    if (thisEnd === undefined) {
      thisEnd = this.length
    }
  
    if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
      throw new RangeError('out of range index')
    }
  
    if (thisStart >= thisEnd && start >= end) {
      return 0
    }
    if (thisStart >= thisEnd) {
      return -1
    }
    if (start >= end) {
      return 1
    }
  
    start >>>= 0
    end >>>= 0
    thisStart >>>= 0
    thisEnd >>>= 0
  
    if (this === target) return 0
  
    var x = thisEnd - thisStart
    var y = end - start
    var len = Math.min(x, y)
  
    var thisCopy = this.slice(thisStart, thisEnd)
    var targetCopy = target.slice(start, end)
  
    for (var i = 0; i < len; ++i) {
      if (thisCopy[i] !== targetCopy[i]) {
        x = thisCopy[i]
        y = targetCopy[i]
        break
      }
    }
  
    if (x < y) return -1
    if (y < x) return 1
    return 0
  }
  
  // Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
  // OR the last index of `val` in `buffer` at offset <= `byteOffset`.
  //
  // Arguments:
  // - buffer - a Buffer to search
  // - val - a string, Buffer, or number
  // - byteOffset - an index into `buffer`; will be clamped to an int32
  // - encoding - an optional encoding, relevant is val is a string
  // - dir - true for indexOf, false for lastIndexOf
  function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
    // Empty buffer means no match
    if (buffer.length === 0) return -1
  
    // Normalize byteOffset
    if (typeof byteOffset === 'string') {
      encoding = byteOffset
      byteOffset = 0
    } else if (byteOffset > 0x7fffffff) {
      byteOffset = 0x7fffffff
    } else if (byteOffset < -0x80000000) {
      byteOffset = -0x80000000
    }
    byteOffset = +byteOffset  // Coerce to Number.
    if (isNaN(byteOffset)) {
      // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
      byteOffset = dir ? 0 : (buffer.length - 1)
    }
  
    // Normalize byteOffset: negative offsets start from the end of the buffer
    if (byteOffset < 0) byteOffset = buffer.length + byteOffset
    if (byteOffset >= buffer.length) {
      if (dir) return -1
      else byteOffset = buffer.length - 1
    } else if (byteOffset < 0) {
      if (dir) byteOffset = 0
      else return -1
    }
  
    // Normalize val
    if (typeof val === 'string') {
      val = Buffer.from(val, encoding)
    }
  
    // Finally, search either indexOf (if dir is true) or lastIndexOf
    if (Buffer.isBuffer(val)) {
      // Special case: looking for empty string/buffer always fails
      if (val.length === 0) {
        return -1
      }
      return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
    } else if (typeof val === 'number') {
      val = val & 0xFF // Search for a byte value [0-255]
      if (Buffer.TYPED_ARRAY_SUPPORT &&
          typeof Uint8Array.prototype.indexOf === 'function') {
        if (dir) {
          return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
        } else {
          return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
        }
      }
      return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
    }
  
    throw new TypeError('val must be string, number or Buffer')
  }
  
  function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
    var indexSize = 1
    var arrLength = arr.length
    var valLength = val.length
  
    if (encoding !== undefined) {
      encoding = String(encoding).toLowerCase()
      if (encoding === 'ucs2' || encoding === 'ucs-2' ||
          encoding === 'utf16le' || encoding === 'utf-16le') {
        if (arr.length < 2 || val.length < 2) {
          return -1
        }
        indexSize = 2
        arrLength /= 2
        valLength /= 2
        byteOffset /= 2
      }
    }
  
    function read (buf, i) {
      if (indexSize === 1) {
        return buf[i]
      } else {
        return buf.readUInt16BE(i * indexSize)
      }
    }
  
    var i
    if (dir) {
      var foundIndex = -1
      for (i = byteOffset; i < arrLength; i++) {
        if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
          if (foundIndex === -1) foundIndex = i
          if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
        } else {
          if (foundIndex !== -1) i -= i - foundIndex
          foundIndex = -1
        }
      }
    } else {
      if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
      for (i = byteOffset; i >= 0; i--) {
        var found = true
        for (var j = 0; j < valLength; j++) {
          if (read(arr, i + j) !== read(val, j)) {
            found = false
            break
          }
        }
        if (found) return i
      }
    }
  
    return -1
  }
  
  Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
    return this.indexOf(val, byteOffset, encoding) !== -1
  }
  
  Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
    return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
  }
  
  Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
    return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
  }
  
  function hexWrite (buf, string, offset, length) {
    offset = Number(offset) || 0
    var remaining = buf.length - offset
    if (!length) {
      length = remaining
    } else {
      length = Number(length)
      if (length > remaining) {
        length = remaining
      }
    }
  
    // must be an even number of digits
    var strLen = string.length
    if (strLen % 2 !== 0) throw new TypeError('Invalid hex string')
  
    if (length > strLen / 2) {
      length = strLen / 2
    }
    for (var i = 0; i < length; ++i) {
      var parsed = parseInt(string.substr(i * 2, 2), 16)
      if (isNaN(parsed)) return i
      buf[offset + i] = parsed
    }
    return i
  }
  
  function utf8Write (buf, string, offset, length) {
    return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
  }
  
  function asciiWrite (buf, string, offset, length) {
    return blitBuffer(asciiToBytes(string), buf, offset, length)
  }
  
  function latin1Write (buf, string, offset, length) {
    return asciiWrite(buf, string, offset, length)
  }
  
  function base64Write (buf, string, offset, length) {
    return blitBuffer(base64ToBytes(string), buf, offset, length)
  }
  
  function ucs2Write (buf, string, offset, length) {
    return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
  }
  
  Buffer.prototype.write = function write (string, offset, length, encoding) {
    // Buffer#write(string)
    if (offset === undefined) {
      encoding = 'utf8'
      length = this.length
      offset = 0
    // Buffer#write(string, encoding)
    } else if (length === undefined && typeof offset === 'string') {
      encoding = offset
      length = this.length
      offset = 0
    // Buffer#write(string, offset[, length][, encoding])
    } else if (isFinite(offset)) {
      offset = offset | 0
      if (isFinite(length)) {
        length = length | 0
        if (encoding === undefined) encoding = 'utf8'
      } else {
        encoding = length
        length = undefined
      }
    // legacy write(string, encoding, offset, length) - remove in v0.13
    } else {
      throw new Error(
        'Buffer.write(string, encoding, offset[, length]) is no longer supported'
      )
    }
  
    var remaining = this.length - offset
    if (length === undefined || length > remaining) length = remaining
  
    if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
      throw new RangeError('Attempt to write outside buffer bounds')
    }
  
    if (!encoding) encoding = 'utf8'
  
    var loweredCase = false
    for (;;) {
      switch (encoding) {
        case 'hex':
          return hexWrite(this, string, offset, length)
  
        case 'utf8':
        case 'utf-8':
          return utf8Write(this, string, offset, length)
  
        case 'ascii':
          return asciiWrite(this, string, offset, length)
  
        case 'latin1':
        case 'binary':
          return latin1Write(this, string, offset, length)
  
        case 'base64':
          // Warning: maxLength not taken into account in base64Write
          return base64Write(this, string, offset, length)
  
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return ucs2Write(this, string, offset, length)
  
        default:
          if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
          encoding = ('' + encoding).toLowerCase()
          loweredCase = true
      }
    }
  }
  
  Buffer.prototype.toJSON = function toJSON () {
    return {
      type: 'Buffer',
      data: Array.prototype.slice.call(this._arr || this, 0)
    }
  }
  
  function base64Slice (buf, start, end) {
    if (start === 0 && end === buf.length) {
      return base64.fromByteArray(buf)
    } else {
      return base64.fromByteArray(buf.slice(start, end))
    }
  }
  
  function utf8Slice (buf, start, end) {
    end = Math.min(buf.length, end)
    var res = []
  
    var i = start
    while (i < end) {
      var firstByte = buf[i]
      var codePoint = null
      var bytesPerSequence = (firstByte > 0xEF) ? 4
        : (firstByte > 0xDF) ? 3
        : (firstByte > 0xBF) ? 2
        : 1
  
      if (i + bytesPerSequence <= end) {
        var secondByte, thirdByte, fourthByte, tempCodePoint
  
        switch (bytesPerSequence) {
          case 1:
            if (firstByte < 0x80) {
              codePoint = firstByte
            }
            break
          case 2:
            secondByte = buf[i + 1]
            if ((secondByte & 0xC0) === 0x80) {
              tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
              if (tempCodePoint > 0x7F) {
                codePoint = tempCodePoint
              }
            }
            break
          case 3:
            secondByte = buf[i + 1]
            thirdByte = buf[i + 2]
            if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
              tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
              if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
                codePoint = tempCodePoint
              }
            }
            break
          case 4:
            secondByte = buf[i + 1]
            thirdByte = buf[i + 2]
            fourthByte = buf[i + 3]
            if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
              tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
              if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
                codePoint = tempCodePoint
              }
            }
        }
      }
  
      if (codePoint === null) {
        // we did not generate a valid codePoint so insert a
        // replacement char (U+FFFD) and advance only 1 byte
        codePoint = 0xFFFD
        bytesPerSequence = 1
      } else if (codePoint > 0xFFFF) {
        // encode to utf16 (surrogate pair dance)
        codePoint -= 0x10000
        res.push(codePoint >>> 10 & 0x3FF | 0xD800)
        codePoint = 0xDC00 | codePoint & 0x3FF
      }
  
      res.push(codePoint)
      i += bytesPerSequence
    }
  
    return decodeCodePointsArray(res)
  }
  
  // Based on http://stackoverflow.com/a/22747272/680742, the browser with
  // the lowest limit is Chrome, with 0x10000 args.
  // We go 1 magnitude less, for safety
  var MAX_ARGUMENTS_LENGTH = 0x1000
  
  function decodeCodePointsArray (codePoints) {
    var len = codePoints.length
    if (len <= MAX_ARGUMENTS_LENGTH) {
      return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
    }
  
    // Decode in chunks to avoid "call stack size exceeded".
    var res = ''
    var i = 0
    while (i < len) {
      res += String.fromCharCode.apply(
        String,
        codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
      )
    }
    return res
  }
  
  function asciiSlice (buf, start, end) {
    var ret = ''
    end = Math.min(buf.length, end)
  
    for (var i = start; i < end; ++i) {
      ret += String.fromCharCode(buf[i] & 0x7F)
    }
    return ret
  }
  
  function latin1Slice (buf, start, end) {
    var ret = ''
    end = Math.min(buf.length, end)
  
    for (var i = start; i < end; ++i) {
      ret += String.fromCharCode(buf[i])
    }
    return ret
  }
  
  function hexSlice (buf, start, end) {
    var len = buf.length
  
    if (!start || start < 0) start = 0
    if (!end || end < 0 || end > len) end = len
  
    var out = ''
    for (var i = start; i < end; ++i) {
      out += toHex(buf[i])
    }
    return out
  }
  
  function utf16leSlice (buf, start, end) {
    var bytes = buf.slice(start, end)
    var res = ''
    for (var i = 0; i < bytes.length; i += 2) {
      res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256)
    }
    return res
  }
  
  Buffer.prototype.slice = function slice (start, end) {
    var len = this.length
    start = ~~start
    end = end === undefined ? len : ~~end
  
    if (start < 0) {
      start += len
      if (start < 0) start = 0
    } else if (start > len) {
      start = len
    }
  
    if (end < 0) {
      end += len
      if (end < 0) end = 0
    } else if (end > len) {
      end = len
    }
  
    if (end < start) end = start
  
    var newBuf
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      newBuf = this.subarray(start, end)
      newBuf.__proto__ = Buffer.prototype
    } else {
      var sliceLen = end - start
      newBuf = new Buffer(sliceLen, undefined)
      for (var i = 0; i < sliceLen; ++i) {
        newBuf[i] = this[i + start]
      }
    }
  
    return newBuf
  }
  
  /*
   * Need to make sure that buffer isn't trying to write out of bounds.
   */
  function checkOffset (offset, ext, length) {
    if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
    if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
  }
  
  Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)
  
    var val = this[offset]
    var mul = 1
    var i = 0
    while (++i < byteLength && (mul *= 0x100)) {
      val += this[offset + i] * mul
    }
  
    return val
  }
  
  Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) {
      checkOffset(offset, byteLength, this.length)
    }
  
    var val = this[offset + --byteLength]
    var mul = 1
    while (byteLength > 0 && (mul *= 0x100)) {
      val += this[offset + --byteLength] * mul
    }
  
    return val
  }
  
  Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 1, this.length)
    return this[offset]
  }
  
  Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 2, this.length)
    return this[offset] | (this[offset + 1] << 8)
  }
  
  Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 2, this.length)
    return (this[offset] << 8) | this[offset + 1]
  }
  
  Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return ((this[offset]) |
        (this[offset + 1] << 8) |
        (this[offset + 2] << 16)) +
        (this[offset + 3] * 0x1000000)
  }
  
  Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return (this[offset] * 0x1000000) +
      ((this[offset + 1] << 16) |
      (this[offset + 2] << 8) |
      this[offset + 3])
  }
  
  Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)
  
    var val = this[offset]
    var mul = 1
    var i = 0
    while (++i < byteLength && (mul *= 0x100)) {
      val += this[offset + i] * mul
    }
    mul *= 0x80
  
    if (val >= mul) val -= Math.pow(2, 8 * byteLength)
  
    return val
  }
  
  Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)
  
    var i = byteLength
    var mul = 1
    var val = this[offset + --i]
    while (i > 0 && (mul *= 0x100)) {
      val += this[offset + --i] * mul
    }
    mul *= 0x80
  
    if (val >= mul) val -= Math.pow(2, 8 * byteLength)
  
    return val
  }
  
  Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 1, this.length)
    if (!(this[offset] & 0x80)) return (this[offset])
    return ((0xff - this[offset] + 1) * -1)
  }
  
  Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 2, this.length)
    var val = this[offset] | (this[offset + 1] << 8)
    return (val & 0x8000) ? val | 0xFFFF0000 : val
  }
  
  Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 2, this.length)
    var val = this[offset + 1] | (this[offset] << 8)
    return (val & 0x8000) ? val | 0xFFFF0000 : val
  }
  
  Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return (this[offset]) |
      (this[offset + 1] << 8) |
      (this[offset + 2] << 16) |
      (this[offset + 3] << 24)
  }
  
  Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return (this[offset] << 24) |
      (this[offset + 1] << 16) |
      (this[offset + 2] << 8) |
      (this[offset + 3])
  }
  
  Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
    return ieee754.read(this, offset, true, 23, 4)
  }
  
  Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
    return ieee754.read(this, offset, false, 23, 4)
  }
  
  Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 8, this.length)
    return ieee754.read(this, offset, true, 52, 8)
  }
  
  Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 8, this.length)
    return ieee754.read(this, offset, false, 52, 8)
  }
  
  function checkInt (buf, value, offset, ext, max, min) {
    if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
    if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
  }
  
  Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) {
      var maxBytes = Math.pow(2, 8 * byteLength) - 1
      checkInt(this, value, offset, byteLength, maxBytes, 0)
    }
  
    var mul = 1
    var i = 0
    this[offset] = value & 0xFF
    while (++i < byteLength && (mul *= 0x100)) {
      this[offset + i] = (value / mul) & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) {
      var maxBytes = Math.pow(2, 8 * byteLength) - 1
      checkInt(this, value, offset, byteLength, maxBytes, 0)
    }
  
    var i = byteLength - 1
    var mul = 1
    this[offset + i] = value & 0xFF
    while (--i >= 0 && (mul *= 0x100)) {
      this[offset + i] = (value / mul) & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
    if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
    this[offset] = (value & 0xff)
    return offset + 1
  }
  
  function objectWriteUInt16 (buf, value, offset, littleEndian) {
    if (value < 0) value = 0xffff + value + 1
    for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; ++i) {
      buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
        (littleEndian ? i : 1 - i) * 8
    }
  }
  
  Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value & 0xff)
      this[offset + 1] = (value >>> 8)
    } else {
      objectWriteUInt16(this, value, offset, true)
    }
    return offset + 2
  }
  
  Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value >>> 8)
      this[offset + 1] = (value & 0xff)
    } else {
      objectWriteUInt16(this, value, offset, false)
    }
    return offset + 2
  }
  
  function objectWriteUInt32 (buf, value, offset, littleEndian) {
    if (value < 0) value = 0xffffffff + value + 1
    for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; ++i) {
      buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff
    }
  }
  
  Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset + 3] = (value >>> 24)
      this[offset + 2] = (value >>> 16)
      this[offset + 1] = (value >>> 8)
      this[offset] = (value & 0xff)
    } else {
      objectWriteUInt32(this, value, offset, true)
    }
    return offset + 4
  }
  
  Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value >>> 24)
      this[offset + 1] = (value >>> 16)
      this[offset + 2] = (value >>> 8)
      this[offset + 3] = (value & 0xff)
    } else {
      objectWriteUInt32(this, value, offset, false)
    }
    return offset + 4
  }
  
  Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) {
      var limit = Math.pow(2, 8 * byteLength - 1)
  
      checkInt(this, value, offset, byteLength, limit - 1, -limit)
    }
  
    var i = 0
    var mul = 1
    var sub = 0
    this[offset] = value & 0xFF
    while (++i < byteLength && (mul *= 0x100)) {
      if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
        sub = 1
      }
      this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) {
      var limit = Math.pow(2, 8 * byteLength - 1)
  
      checkInt(this, value, offset, byteLength, limit - 1, -limit)
    }
  
    var i = byteLength - 1
    var mul = 1
    var sub = 0
    this[offset + i] = value & 0xFF
    while (--i >= 0 && (mul *= 0x100)) {
      if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
        sub = 1
      }
      this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
    if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
    if (value < 0) value = 0xff + value + 1
    this[offset] = (value & 0xff)
    return offset + 1
  }
  
  Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value & 0xff)
      this[offset + 1] = (value >>> 8)
    } else {
      objectWriteUInt16(this, value, offset, true)
    }
    return offset + 2
  }
  
  Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value >>> 8)
      this[offset + 1] = (value & 0xff)
    } else {
      objectWriteUInt16(this, value, offset, false)
    }
    return offset + 2
  }
  
  Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value & 0xff)
      this[offset + 1] = (value >>> 8)
      this[offset + 2] = (value >>> 16)
      this[offset + 3] = (value >>> 24)
    } else {
      objectWriteUInt32(this, value, offset, true)
    }
    return offset + 4
  }
  
  Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
    if (value < 0) value = 0xffffffff + value + 1
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value >>> 24)
      this[offset + 1] = (value >>> 16)
      this[offset + 2] = (value >>> 8)
      this[offset + 3] = (value & 0xff)
    } else {
      objectWriteUInt32(this, value, offset, false)
    }
    return offset + 4
  }
  
  function checkIEEE754 (buf, value, offset, ext, max, min) {
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
    if (offset < 0) throw new RangeError('Index out of range')
  }
  
  function writeFloat (buf, value, offset, littleEndian, noAssert) {
    if (!noAssert) {
      checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
    }
    ieee754.write(buf, value, offset, littleEndian, 23, 4)
    return offset + 4
  }
  
  Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
    return writeFloat(this, value, offset, true, noAssert)
  }
  
  Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
    return writeFloat(this, value, offset, false, noAssert)
  }
  
  function writeDouble (buf, value, offset, littleEndian, noAssert) {
    if (!noAssert) {
      checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
    }
    ieee754.write(buf, value, offset, littleEndian, 52, 8)
    return offset + 8
  }
  
  Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
    return writeDouble(this, value, offset, true, noAssert)
  }
  
  Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
    return writeDouble(this, value, offset, false, noAssert)
  }
  
  // copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
  Buffer.prototype.copy = function copy (target, targetStart, start, end) {
    if (!start) start = 0
    if (!end && end !== 0) end = this.length
    if (targetStart >= target.length) targetStart = target.length
    if (!targetStart) targetStart = 0
    if (end > 0 && end < start) end = start
  
    // Copy 0 bytes; we're done
    if (end === start) return 0
    if (target.length === 0 || this.length === 0) return 0
  
    // Fatal error conditions
    if (targetStart < 0) {
      throw new RangeError('targetStart out of bounds')
    }
    if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')
    if (end < 0) throw new RangeError('sourceEnd out of bounds')
  
    // Are we oob?
    if (end > this.length) end = this.length
    if (target.length - targetStart < end - start) {
      end = target.length - targetStart + start
    }
  
    var len = end - start
    var i
  
    if (this === target && start < targetStart && targetStart < end) {
      // descending copy from end
      for (i = len - 1; i >= 0; --i) {
        target[i + targetStart] = this[i + start]
      }
    } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
      // ascending copy from start
      for (i = 0; i < len; ++i) {
        target[i + targetStart] = this[i + start]
      }
    } else {
      Uint8Array.prototype.set.call(
        target,
        this.subarray(start, start + len),
        targetStart
      )
    }
  
    return len
  }
  
  // Usage:
  //    buffer.fill(number[, offset[, end]])
  //    buffer.fill(buffer[, offset[, end]])
  //    buffer.fill(string[, offset[, end]][, encoding])
  Buffer.prototype.fill = function fill (val, start, end, encoding) {
    // Handle string cases:
    if (typeof val === 'string') {
      if (typeof start === 'string') {
        encoding = start
        start = 0
        end = this.length
      } else if (typeof end === 'string') {
        encoding = end
        end = this.length
      }
      if (val.length === 1) {
        var code = val.charCodeAt(0)
        if (code < 256) {
          val = code
        }
      }
      if (encoding !== undefined && typeof encoding !== 'string') {
        throw new TypeError('encoding must be a string')
      }
      if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
        throw new TypeError('Unknown encoding: ' + encoding)
      }
    } else if (typeof val === 'number') {
      val = val & 255
    }
  
    // Invalid ranges are not set to a default, so can range check early.
    if (start < 0 || this.length < start || this.length < end) {
      throw new RangeError('Out of range index')
    }
  
    if (end <= start) {
      return this
    }
  
    start = start >>> 0
    end = end === undefined ? this.length : end >>> 0
  
    if (!val) val = 0
  
    var i
    if (typeof val === 'number') {
      for (i = start; i < end; ++i) {
        this[i] = val
      }
    } else {
      var bytes = Buffer.isBuffer(val)
        ? val
        : utf8ToBytes(new Buffer(val, encoding).toString())
      var len = bytes.length
      for (i = 0; i < end - start; ++i) {
        this[i + start] = bytes[i % len]
      }
    }
  
    return this
  }
  
  // HELPER FUNCTIONS
  // ================
  
  var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g
  
  function base64clean (str) {
    // Node strips out invalid characters like \n and \t from the string, base64-js does not
    str = stringtrim(str).replace(INVALID_BASE64_RE, '')
    // Node converts strings with length < 2 to ''
    if (str.length < 2) return ''
    // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
    while (str.length % 4 !== 0) {
      str = str + '='
    }
    return str
  }
  
  function stringtrim (str) {
    if (str.trim) return str.trim()
    return str.replace(/^\s+|\s+$/g, '')
  }
  
  function toHex (n) {
    if (n < 16) return '0' + n.toString(16)
    return n.toString(16)
  }
  
  function utf8ToBytes (string, units) {
    units = units || Infinity
    var codePoint
    var length = string.length
    var leadSurrogate = null
    var bytes = []
  
    for (var i = 0; i < length; ++i) {
      codePoint = string.charCodeAt(i)
  
      // is surrogate component
      if (codePoint > 0xD7FF && codePoint < 0xE000) {
        // last char was a lead
        if (!leadSurrogate) {
          // no lead yet
          if (codePoint > 0xDBFF) {
            // unexpected trail
            if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
            continue
          } else if (i + 1 === length) {
            // unpaired lead
            if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
            continue
          }
  
          // valid lead
          leadSurrogate = codePoint
  
          continue
        }
  
        // 2 leads in a row
        if (codePoint < 0xDC00) {
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          leadSurrogate = codePoint
          continue
        }
  
        // valid surrogate pair
        codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
      } else if (leadSurrogate) {
        // valid bmp char, but last char was a lead
        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
      }
  
      leadSurrogate = null
  
      // encode utf8
      if (codePoint < 0x80) {
        if ((units -= 1) < 0) break
        bytes.push(codePoint)
      } else if (codePoint < 0x800) {
        if ((units -= 2) < 0) break
        bytes.push(
          codePoint >> 0x6 | 0xC0,
          codePoint & 0x3F | 0x80
        )
      } else if (codePoint < 0x10000) {
        if ((units -= 3) < 0) break
        bytes.push(
          codePoint >> 0xC | 0xE0,
          codePoint >> 0x6 & 0x3F | 0x80,
          codePoint & 0x3F | 0x80
        )
      } else if (codePoint < 0x110000) {
        if ((units -= 4) < 0) break
        bytes.push(
          codePoint >> 0x12 | 0xF0,
          codePoint >> 0xC & 0x3F | 0x80,
          codePoint >> 0x6 & 0x3F | 0x80,
          codePoint & 0x3F | 0x80
        )
      } else {
        throw new Error('Invalid code point')
      }
    }
  
    return bytes
  }
  
  function asciiToBytes (str) {
    var byteArray = []
    for (var i = 0; i < str.length; ++i) {
      // Node's code seems to be doing this and not & 0x7F..
      byteArray.push(str.charCodeAt(i) & 0xFF)
    }
    return byteArray
  }
  
  function utf16leToBytes (str, units) {
    var c, hi, lo
    var byteArray = []
    for (var i = 0; i < str.length; ++i) {
      if ((units -= 2) < 0) break
  
      c = str.charCodeAt(i)
      hi = c >> 8
      lo = c % 256
      byteArray.push(lo)
      byteArray.push(hi)
    }
  
    return byteArray
  }
  
  function base64ToBytes (str) {
    return base64.toByteArray(base64clean(str))
  }
  
  function blitBuffer (src, dst, offset, length) {
    for (var i = 0; i < length; ++i) {
      if ((i + offset >= dst.length) || (i >= src.length)) break
      dst[i + offset] = src[i]
    }
    return i
  }
  
  function isnan (val) {
    return val !== val // eslint-disable-line no-self-compare
  }
  
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"base64-js":1,"ieee754":10,"isarray":4}],4:[function(require,module,exports){
  var toString = {}.toString;
  
  module.exports = Array.isArray || function (arr) {
    return toString.call(arr) == '[object Array]';
  };
  
  },{}],5:[function(require,module,exports){
  "use strict"
  
  var createThunk = require("./lib/thunk.js")
  
  function Procedure() {
    this.argTypes = []
    this.shimArgs = []
    this.arrayArgs = []
    this.arrayBlockIndices = []
    this.scalarArgs = []
    this.offsetArgs = []
    this.offsetArgIndex = []
    this.indexArgs = []
    this.shapeArgs = []
    this.funcName = ""
    this.pre = null
    this.body = null
    this.post = null
    this.debug = false
  }
  
  function compileCwise(user_args) {
    //Create procedure
    var proc = new Procedure()
    
    //Parse blocks
    proc.pre    = user_args.pre
    proc.body   = user_args.body
    proc.post   = user_args.post
  
    //Parse arguments
    var proc_args = user_args.args.slice(0)
    proc.argTypes = proc_args
    for(var i=0; i<proc_args.length; ++i) {
      var arg_type = proc_args[i]
      if(arg_type === "array" || (typeof arg_type === "object" && arg_type.blockIndices)) {
        proc.argTypes[i] = "array"
        proc.arrayArgs.push(i)
        proc.arrayBlockIndices.push(arg_type.blockIndices ? arg_type.blockIndices : 0)
        proc.shimArgs.push("array" + i)
        if(i < proc.pre.args.length && proc.pre.args[i].count>0) {
          throw new Error("cwise: pre() block may not reference array args")
        }
        if(i < proc.post.args.length && proc.post.args[i].count>0) {
          throw new Error("cwise: post() block may not reference array args")
        }
      } else if(arg_type === "scalar") {
        proc.scalarArgs.push(i)
        proc.shimArgs.push("scalar" + i)
      } else if(arg_type === "index") {
        proc.indexArgs.push(i)
        if(i < proc.pre.args.length && proc.pre.args[i].count > 0) {
          throw new Error("cwise: pre() block may not reference array index")
        }
        if(i < proc.body.args.length && proc.body.args[i].lvalue) {
          throw new Error("cwise: body() block may not write to array index")
        }
        if(i < proc.post.args.length && proc.post.args[i].count > 0) {
          throw new Error("cwise: post() block may not reference array index")
        }
      } else if(arg_type === "shape") {
        proc.shapeArgs.push(i)
        if(i < proc.pre.args.length && proc.pre.args[i].lvalue) {
          throw new Error("cwise: pre() block may not write to array shape")
        }
        if(i < proc.body.args.length && proc.body.args[i].lvalue) {
          throw new Error("cwise: body() block may not write to array shape")
        }
        if(i < proc.post.args.length && proc.post.args[i].lvalue) {
          throw new Error("cwise: post() block may not write to array shape")
        }
      } else if(typeof arg_type === "object" && arg_type.offset) {
        proc.argTypes[i] = "offset"
        proc.offsetArgs.push({ array: arg_type.array, offset:arg_type.offset })
        proc.offsetArgIndex.push(i)
      } else {
        throw new Error("cwise: Unknown argument type " + proc_args[i])
      }
    }
    
    //Make sure at least one array argument was specified
    if(proc.arrayArgs.length <= 0) {
      throw new Error("cwise: No array arguments specified")
    }
    
    //Make sure arguments are correct
    if(proc.pre.args.length > proc_args.length) {
      throw new Error("cwise: Too many arguments in pre() block")
    }
    if(proc.body.args.length > proc_args.length) {
      throw new Error("cwise: Too many arguments in body() block")
    }
    if(proc.post.args.length > proc_args.length) {
      throw new Error("cwise: Too many arguments in post() block")
    }
  
    //Check debug flag
    proc.debug = !!user_args.printCode || !!user_args.debug
    
    //Retrieve name
    proc.funcName = user_args.funcName || "cwise"
    
    //Read in block size
    proc.blockSize = user_args.blockSize || 64
  
    return createThunk(proc)
  }
  
  module.exports = compileCwise
  
  },{"./lib/thunk.js":7}],6:[function(require,module,exports){
  "use strict"
  
  var uniq = require("uniq")
  
  // This function generates very simple loops analogous to how you typically traverse arrays (the outermost loop corresponds to the slowest changing index, the innermost loop to the fastest changing index)
  // TODO: If two arrays have the same strides (and offsets) there is potential for decreasing the number of "pointers" and related variables. The drawback is that the type signature would become more specific and that there would thus be less potential for caching, but it might still be worth it, especially when dealing with large numbers of arguments.
  function innerFill(order, proc, body) {
    var dimension = order.length
      , nargs = proc.arrayArgs.length
      , has_index = proc.indexArgs.length>0
      , code = []
      , vars = []
      , idx=0, pidx=0, i, j
    for(i=0; i<dimension; ++i) { // Iteration variables
      vars.push(["i",i,"=0"].join(""))
    }
    //Compute scan deltas
    for(j=0; j<nargs; ++j) {
      for(i=0; i<dimension; ++i) {
        pidx = idx
        idx = order[i]
        if(i === 0) { // The innermost/fastest dimension's delta is simply its stride
          vars.push(["d",j,"s",i,"=t",j,"p",idx].join(""))
        } else { // For other dimensions the delta is basically the stride minus something which essentially "rewinds" the previous (more inner) dimension
          vars.push(["d",j,"s",i,"=(t",j,"p",idx,"-s",pidx,"*t",j,"p",pidx,")"].join(""))
        }
      }
    }
    code.push("var " + vars.join(","))
    //Scan loop
    for(i=dimension-1; i>=0; --i) { // Start at largest stride and work your way inwards
      idx = order[i]
      code.push(["for(i",i,"=0;i",i,"<s",idx,";++i",i,"){"].join(""))
    }
    //Push body of inner loop
    code.push(body)
    //Advance scan pointers
    for(i=0; i<dimension; ++i) {
      pidx = idx
      idx = order[i]
      for(j=0; j<nargs; ++j) {
        code.push(["p",j,"+=d",j,"s",i].join(""))
      }
      if(has_index) {
        if(i > 0) {
          code.push(["index[",pidx,"]-=s",pidx].join(""))
        }
        code.push(["++index[",idx,"]"].join(""))
      }
      code.push("}")
    }
    return code.join("\n")
  }
  
  // Generate "outer" loops that loop over blocks of data, applying "inner" loops to the blocks by manipulating the local variables in such a way that the inner loop only "sees" the current block.
  // TODO: If this is used, then the previous declaration (done by generateCwiseOp) of s* is essentially unnecessary.
  //       I believe the s* are not used elsewhere (in particular, I don't think they're used in the pre/post parts and "shape" is defined independently), so it would be possible to make defining the s* dependent on what loop method is being used.
  function outerFill(matched, order, proc, body) {
    var dimension = order.length
      , nargs = proc.arrayArgs.length
      , blockSize = proc.blockSize
      , has_index = proc.indexArgs.length > 0
      , code = []
    for(var i=0; i<nargs; ++i) {
      code.push(["var offset",i,"=p",i].join(""))
    }
    //Generate loops for unmatched dimensions
    // The order in which these dimensions are traversed is fairly arbitrary (from small stride to large stride, for the first argument)
    // TODO: It would be nice if the order in which these loops are placed would also be somehow "optimal" (at the very least we should check that it really doesn't hurt us if they're not).
    for(var i=matched; i<dimension; ++i) {
      code.push(["for(var j"+i+"=SS[", order[i], "]|0;j", i, ">0;){"].join("")) // Iterate back to front
      code.push(["if(j",i,"<",blockSize,"){"].join("")) // Either decrease j by blockSize (s = blockSize), or set it to zero (after setting s = j).
      code.push(["s",order[i],"=j",i].join(""))
      code.push(["j",i,"=0"].join(""))
      code.push(["}else{s",order[i],"=",blockSize].join(""))
      code.push(["j",i,"-=",blockSize,"}"].join(""))
      if(has_index) {
        code.push(["index[",order[i],"]=j",i].join(""))
      }
    }
    for(var i=0; i<nargs; ++i) {
      var indexStr = ["offset"+i]
      for(var j=matched; j<dimension; ++j) {
        indexStr.push(["j",j,"*t",i,"p",order[j]].join(""))
      }
      code.push(["p",i,"=(",indexStr.join("+"),")"].join(""))
    }
    code.push(innerFill(order, proc, body))
    for(var i=matched; i<dimension; ++i) {
      code.push("}")
    }
    return code.join("\n")
  }
  
  //Count the number of compatible inner orders
  // This is the length of the longest common prefix of the arrays in orders.
  // Each array in orders lists the dimensions of the correspond ndarray in order of increasing stride.
  // This is thus the maximum number of dimensions that can be efficiently traversed by simple nested loops for all arrays.
  function countMatches(orders) {
    var matched = 0, dimension = orders[0].length
    while(matched < dimension) {
      for(var j=1; j<orders.length; ++j) {
        if(orders[j][matched] !== orders[0][matched]) {
          return matched
        }
      }
      ++matched
    }
    return matched
  }
  
  //Processes a block according to the given data types
  // Replaces variable names by different ones, either "local" ones (that are then ferried in and out of the given array) or ones matching the arguments that the function performing the ultimate loop will accept.
  function processBlock(block, proc, dtypes) {
    var code = block.body
    var pre = []
    var post = []
    for(var i=0; i<block.args.length; ++i) {
      var carg = block.args[i]
      if(carg.count <= 0) {
        continue
      }
      var re = new RegExp(carg.name, "g")
      var ptrStr = ""
      var arrNum = proc.arrayArgs.indexOf(i)
      switch(proc.argTypes[i]) {
        case "offset":
          var offArgIndex = proc.offsetArgIndex.indexOf(i)
          var offArg = proc.offsetArgs[offArgIndex]
          arrNum = offArg.array
          ptrStr = "+q" + offArgIndex // Adds offset to the "pointer" in the array
        case "array":
          ptrStr = "p" + arrNum + ptrStr
          var localStr = "l" + i
          var arrStr = "a" + arrNum
          if (proc.arrayBlockIndices[arrNum] === 0) { // Argument to body is just a single value from this array
            if(carg.count === 1) { // Argument/array used only once(?)
              if(dtypes[arrNum] === "generic") {
                if(carg.lvalue) {
                  pre.push(["var ", localStr, "=", arrStr, ".get(", ptrStr, ")"].join("")) // Is this necessary if the argument is ONLY used as an lvalue? (keep in mind that we can have a += something, so we would actually need to check carg.rvalue)
                  code = code.replace(re, localStr)
                  post.push([arrStr, ".set(", ptrStr, ",", localStr,")"].join(""))
                } else {
                  code = code.replace(re, [arrStr, ".get(", ptrStr, ")"].join(""))
                }
              } else {
                code = code.replace(re, [arrStr, "[", ptrStr, "]"].join(""))
              }
            } else if(dtypes[arrNum] === "generic") {
              pre.push(["var ", localStr, "=", arrStr, ".get(", ptrStr, ")"].join("")) // TODO: Could we optimize by checking for carg.rvalue?
              code = code.replace(re, localStr)
              if(carg.lvalue) {
                post.push([arrStr, ".set(", ptrStr, ",", localStr,")"].join(""))
              }
            } else {
              pre.push(["var ", localStr, "=", arrStr, "[", ptrStr, "]"].join("")) // TODO: Could we optimize by checking for carg.rvalue?
              code = code.replace(re, localStr)
              if(carg.lvalue) {
                post.push([arrStr, "[", ptrStr, "]=", localStr].join(""))
              }
            }
          } else { // Argument to body is a "block"
            var reStrArr = [carg.name], ptrStrArr = [ptrStr]
            for(var j=0; j<Math.abs(proc.arrayBlockIndices[arrNum]); j++) {
              reStrArr.push("\\s*\\[([^\\]]+)\\]")
              ptrStrArr.push("$" + (j+1) + "*t" + arrNum + "b" + j) // Matched index times stride
            }
            re = new RegExp(reStrArr.join(""), "g")
            ptrStr = ptrStrArr.join("+")
            if(dtypes[arrNum] === "generic") {
              /*if(carg.lvalue) {
                pre.push(["var ", localStr, "=", arrStr, ".get(", ptrStr, ")"].join("")) // Is this necessary if the argument is ONLY used as an lvalue? (keep in mind that we can have a += something, so we would actually need to check carg.rvalue)
                code = code.replace(re, localStr)
                post.push([arrStr, ".set(", ptrStr, ",", localStr,")"].join(""))
              } else {
                code = code.replace(re, [arrStr, ".get(", ptrStr, ")"].join(""))
              }*/
              throw new Error("cwise: Generic arrays not supported in combination with blocks!")
            } else {
              // This does not produce any local variables, even if variables are used multiple times. It would be possible to do so, but it would complicate things quite a bit.
              code = code.replace(re, [arrStr, "[", ptrStr, "]"].join(""))
            }
          }
        break
        case "scalar":
          code = code.replace(re, "Y" + proc.scalarArgs.indexOf(i))
        break
        case "index":
          code = code.replace(re, "index")
        break
        case "shape":
          code = code.replace(re, "shape")
        break
      }
    }
    return [pre.join("\n"), code, post.join("\n")].join("\n").trim()
  }
  
  function typeSummary(dtypes) {
    var summary = new Array(dtypes.length)
    var allEqual = true
    for(var i=0; i<dtypes.length; ++i) {
      var t = dtypes[i]
      var digits = t.match(/\d+/)
      if(!digits) {
        digits = ""
      } else {
        digits = digits[0]
      }
      if(t.charAt(0) === 0) {
        summary[i] = "u" + t.charAt(1) + digits
      } else {
        summary[i] = t.charAt(0) + digits
      }
      if(i > 0) {
        allEqual = allEqual && summary[i] === summary[i-1]
      }
    }
    if(allEqual) {
      return summary[0]
    }
    return summary.join("")
  }
  
  //Generates a cwise operator
  function generateCWiseOp(proc, typesig) {
  
    //Compute dimension
    // Arrays get put first in typesig, and there are two entries per array (dtype and order), so this gets the number of dimensions in the first array arg.
    var dimension = (typesig[1].length - Math.abs(proc.arrayBlockIndices[0]))|0
    var orders = new Array(proc.arrayArgs.length)
    var dtypes = new Array(proc.arrayArgs.length)
    for(var i=0; i<proc.arrayArgs.length; ++i) {
      dtypes[i] = typesig[2*i]
      orders[i] = typesig[2*i+1]
    }
    
    //Determine where block and loop indices start and end
    var blockBegin = [], blockEnd = [] // These indices are exposed as blocks
    var loopBegin = [], loopEnd = [] // These indices are iterated over
    var loopOrders = [] // orders restricted to the loop indices
    for(var i=0; i<proc.arrayArgs.length; ++i) {
      if (proc.arrayBlockIndices[i]<0) {
        loopBegin.push(0)
        loopEnd.push(dimension)
        blockBegin.push(dimension)
        blockEnd.push(dimension+proc.arrayBlockIndices[i])
      } else {
        loopBegin.push(proc.arrayBlockIndices[i]) // Non-negative
        loopEnd.push(proc.arrayBlockIndices[i]+dimension)
        blockBegin.push(0)
        blockEnd.push(proc.arrayBlockIndices[i])
      }
      var newOrder = []
      for(var j=0; j<orders[i].length; j++) {
        if (loopBegin[i]<=orders[i][j] && orders[i][j]<loopEnd[i]) {
          newOrder.push(orders[i][j]-loopBegin[i]) // If this is a loop index, put it in newOrder, subtracting loopBegin, to make sure that all loopOrders are using a common set of indices.
        }
      }
      loopOrders.push(newOrder)
    }
  
    //First create arguments for procedure
    var arglist = ["SS"] // SS is the overall shape over which we iterate
    var code = ["'use strict'"]
    var vars = []
    
    for(var j=0; j<dimension; ++j) {
      vars.push(["s", j, "=SS[", j, "]"].join("")) // The limits for each dimension.
    }
    for(var i=0; i<proc.arrayArgs.length; ++i) {
      arglist.push("a"+i) // Actual data array
      arglist.push("t"+i) // Strides
      arglist.push("p"+i) // Offset in the array at which the data starts (also used for iterating over the data)
      
      for(var j=0; j<dimension; ++j) { // Unpack the strides into vars for looping
        vars.push(["t",i,"p",j,"=t",i,"[",loopBegin[i]+j,"]"].join(""))
      }
      
      for(var j=0; j<Math.abs(proc.arrayBlockIndices[i]); ++j) { // Unpack the strides into vars for block iteration
        vars.push(["t",i,"b",j,"=t",i,"[",blockBegin[i]+j,"]"].join(""))
      }
    }
    for(var i=0; i<proc.scalarArgs.length; ++i) {
      arglist.push("Y" + i)
    }
    if(proc.shapeArgs.length > 0) {
      vars.push("shape=SS.slice(0)") // Makes the shape over which we iterate available to the user defined functions (so you can use width/height for example)
    }
    if(proc.indexArgs.length > 0) {
      // Prepare an array to keep track of the (logical) indices, initialized to dimension zeroes.
      var zeros = new Array(dimension)
      for(var i=0; i<dimension; ++i) {
        zeros[i] = "0"
      }
      vars.push(["index=[", zeros.join(","), "]"].join(""))
    }
    for(var i=0; i<proc.offsetArgs.length; ++i) { // Offset arguments used for stencil operations
      var off_arg = proc.offsetArgs[i]
      var init_string = []
      for(var j=0; j<off_arg.offset.length; ++j) {
        if(off_arg.offset[j] === 0) {
          continue
        } else if(off_arg.offset[j] === 1) {
          init_string.push(["t", off_arg.array, "p", j].join(""))      
        } else {
          init_string.push([off_arg.offset[j], "*t", off_arg.array, "p", j].join(""))
        }
      }
      if(init_string.length === 0) {
        vars.push("q" + i + "=0")
      } else {
        vars.push(["q", i, "=", init_string.join("+")].join(""))
      }
    }
  
    //Prepare this variables
    var thisVars = uniq([].concat(proc.pre.thisVars)
                        .concat(proc.body.thisVars)
                        .concat(proc.post.thisVars))
    vars = vars.concat(thisVars)
    code.push("var " + vars.join(","))
    for(var i=0; i<proc.arrayArgs.length; ++i) {
      code.push("p"+i+"|=0")
    }
    
    //Inline prelude
    if(proc.pre.body.length > 3) {
      code.push(processBlock(proc.pre, proc, dtypes))
    }
  
    //Process body
    var body = processBlock(proc.body, proc, dtypes)
    var matched = countMatches(loopOrders)
    if(matched < dimension) {
      code.push(outerFill(matched, loopOrders[0], proc, body)) // TODO: Rather than passing loopOrders[0], it might be interesting to look at passing an order that represents the majority of the arguments for example.
    } else {
      code.push(innerFill(loopOrders[0], proc, body))
    }
  
    //Inline epilog
    if(proc.post.body.length > 3) {
      code.push(processBlock(proc.post, proc, dtypes))
    }
    
    if(proc.debug) {
      console.log("-----Generated cwise routine for ", typesig, ":\n" + code.join("\n") + "\n----------")
    }
    
    var loopName = [(proc.funcName||"unnamed"), "_cwise_loop_", orders[0].join("s"),"m",matched,typeSummary(dtypes)].join("")
    var f = new Function(["function ",loopName,"(", arglist.join(","),"){", code.join("\n"),"} return ", loopName].join(""))
    return f()
  }
  module.exports = generateCWiseOp
  
  },{"uniq":23}],7:[function(require,module,exports){
  "use strict"
  
  // The function below is called when constructing a cwise function object, and does the following:
  // A function object is constructed which accepts as argument a compilation function and returns another function.
  // It is this other function that is eventually returned by createThunk, and this function is the one that actually
  // checks whether a certain pattern of arguments has already been used before and compiles new loops as needed.
  // The compilation passed to the first function object is used for compiling new functions.
  // Once this function object is created, it is called with compile as argument, where the first argument of compile
  // is bound to "proc" (essentially containing a preprocessed version of the user arguments to cwise).
  // So createThunk roughly works like this:
  // function createThunk(proc) {
  //   var thunk = function(compileBound) {
  //     var CACHED = {}
  //     return function(arrays and scalars) {
  //       if (dtype and order of arrays in CACHED) {
  //         var func = CACHED[dtype and order of arrays]
  //       } else {
  //         var func = CACHED[dtype and order of arrays] = compileBound(dtype and order of arrays)
  //       }
  //       return func(arrays and scalars)
  //     }
  //   }
  //   return thunk(compile.bind1(proc))
  // }
  
  var compile = require("./compile.js")
  
  function createThunk(proc) {
    var code = ["'use strict'", "var CACHED={}"]
    var vars = []
    var thunkName = proc.funcName + "_cwise_thunk"
    
    //Build thunk
    code.push(["return function ", thunkName, "(", proc.shimArgs.join(","), "){"].join(""))
    var typesig = []
    var string_typesig = []
    var proc_args = [["array",proc.arrayArgs[0],".shape.slice(", // Slice shape so that we only retain the shape over which we iterate (which gets passed to the cwise operator as SS).
                      Math.max(0,proc.arrayBlockIndices[0]),proc.arrayBlockIndices[0]<0?(","+proc.arrayBlockIndices[0]+")"):")"].join("")]
    var shapeLengthConditions = [], shapeConditions = []
    // Process array arguments
    for(var i=0; i<proc.arrayArgs.length; ++i) {
      var j = proc.arrayArgs[i]
      vars.push(["t", j, "=array", j, ".dtype,",
                 "r", j, "=array", j, ".order"].join(""))
      typesig.push("t" + j)
      typesig.push("r" + j)
      string_typesig.push("t"+j)
      string_typesig.push("r"+j+".join()")
      proc_args.push("array" + j + ".data")
      proc_args.push("array" + j + ".stride")
      proc_args.push("array" + j + ".offset|0")
      if (i>0) { // Gather conditions to check for shape equality (ignoring block indices)
        shapeLengthConditions.push("array" + proc.arrayArgs[0] + ".shape.length===array" + j + ".shape.length+" + (Math.abs(proc.arrayBlockIndices[0])-Math.abs(proc.arrayBlockIndices[i])))
        shapeConditions.push("array" + proc.arrayArgs[0] + ".shape[shapeIndex+" + Math.max(0,proc.arrayBlockIndices[0]) + "]===array" + j + ".shape[shapeIndex+" + Math.max(0,proc.arrayBlockIndices[i]) + "]")
      }
    }
    // Check for shape equality
    if (proc.arrayArgs.length > 1) {
      code.push("if (!(" + shapeLengthConditions.join(" && ") + ")) throw new Error('cwise: Arrays do not all have the same dimensionality!')")
      code.push("for(var shapeIndex=array" + proc.arrayArgs[0] + ".shape.length-" + Math.abs(proc.arrayBlockIndices[0]) + "; shapeIndex-->0;) {")
      code.push("if (!(" + shapeConditions.join(" && ") + ")) throw new Error('cwise: Arrays do not all have the same shape!')")
      code.push("}")
    }
    // Process scalar arguments
    for(var i=0; i<proc.scalarArgs.length; ++i) {
      proc_args.push("scalar" + proc.scalarArgs[i])
    }
    // Check for cached function (and if not present, generate it)
    vars.push(["type=[", string_typesig.join(","), "].join()"].join(""))
    vars.push("proc=CACHED[type]")
    code.push("var " + vars.join(","))
    
    code.push(["if(!proc){",
               "CACHED[type]=proc=compile([", typesig.join(","), "])}",
               "return proc(", proc_args.join(","), ")}"].join(""))
  
    if(proc.debug) {
      console.log("-----Generated thunk:\n" + code.join("\n") + "\n----------")
    }
    
    //Compile thunk
    var thunk = new Function("compile", code.join("\n"))
    return thunk(compile.bind(undefined, proc))
  }
  
  module.exports = createThunk
  
  },{"./compile.js":6}],8:[function(require,module,exports){
  module.exports = require("cwise-compiler")
  },{"cwise-compiler":5}],9:[function(require,module,exports){
  "use strict"
  
  function dupe_array(count, value, i) {
    var c = count[i]|0
    if(c <= 0) {
      return []
    }
    var result = new Array(c), j
    if(i === count.length-1) {
      for(j=0; j<c; ++j) {
        result[j] = value
      }
    } else {
      for(j=0; j<c; ++j) {
        result[j] = dupe_array(count, value, i+1)
      }
    }
    return result
  }
  
  function dupe_number(count, value) {
    var result, i
    result = new Array(count)
    for(i=0; i<count; ++i) {
      result[i] = value
    }
    return result
  }
  
  function dupe(count, value) {
    if(typeof value === "undefined") {
      value = 0
    }
    switch(typeof count) {
      case "number":
        if(count > 0) {
          return dupe_number(count|0, value)
        }
      break
      case "object":
        if(typeof (count.length) === "number") {
          return dupe_array(count, value, 0)
        }
      break
    }
    return []
  }
  
  module.exports = dupe
  },{}],10:[function(require,module,exports){
  exports.read = function (buffer, offset, isLE, mLen, nBytes) {
    var e, m
    var eLen = nBytes * 8 - mLen - 1
    var eMax = (1 << eLen) - 1
    var eBias = eMax >> 1
    var nBits = -7
    var i = isLE ? (nBytes - 1) : 0
    var d = isLE ? -1 : 1
    var s = buffer[offset + i]
  
    i += d
  
    e = s & ((1 << (-nBits)) - 1)
    s >>= (-nBits)
    nBits += eLen
    for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}
  
    m = e & ((1 << (-nBits)) - 1)
    e >>= (-nBits)
    nBits += mLen
    for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}
  
    if (e === 0) {
      e = 1 - eBias
    } else if (e === eMax) {
      return m ? NaN : ((s ? -1 : 1) * Infinity)
    } else {
      m = m + Math.pow(2, mLen)
      e = e - eBias
    }
    return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
  }
  
  exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
    var e, m, c
    var eLen = nBytes * 8 - mLen - 1
    var eMax = (1 << eLen) - 1
    var eBias = eMax >> 1
    var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
    var i = isLE ? 0 : (nBytes - 1)
    var d = isLE ? 1 : -1
    var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
  
    value = Math.abs(value)
  
    if (isNaN(value) || value === Infinity) {
      m = isNaN(value) ? 1 : 0
      e = eMax
    } else {
      e = Math.floor(Math.log(value) / Math.LN2)
      if (value * (c = Math.pow(2, -e)) < 1) {
        e--
        c *= 2
      }
      if (e + eBias >= 1) {
        value += rt / c
      } else {
        value += rt * Math.pow(2, 1 - eBias)
      }
      if (value * c >= 2) {
        e++
        c /= 2
      }
  
      if (e + eBias >= eMax) {
        m = 0
        e = eMax
      } else if (e + eBias >= 1) {
        m = (value * c - 1) * Math.pow(2, mLen)
        e = e + eBias
      } else {
        m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
        e = 0
      }
    }
  
    for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
  
    e = (e << mLen) | m
    eLen += mLen
    for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
  
    buffer[offset + i - d] |= s * 128
  }
  
  },{}],11:[function(require,module,exports){
  "use strict"
  
  function iota(n) {
    var result = new Array(n)
    for(var i=0; i<n; ++i) {
      result[i] = i
    }
    return result
  }
  
  module.exports = iota
  },{}],12:[function(require,module,exports){
  /*!
   * Determine if an object is a Buffer
   *
   * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
   * @license  MIT
   */
  
  // The _isBuffer check is for Safari 5-7 support, because it's missing
  // Object.prototype.constructor. Remove this eventually
  module.exports = function (obj) {
    return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)
  }
  
  function isBuffer (obj) {
    return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
  }
  
  // For Node v0.10 support. Remove this eventually.
  function isSlowBuffer (obj) {
    return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))
  }
  
  },{}],13:[function(require,module,exports){
  (function (global){
  /**
   * @license
   * Lodash <https://lodash.com/>
   * Copyright JS Foundation and other contributors <https://js.foundation/>
   * Released under MIT license <https://lodash.com/license>
   * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
   * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
   */
  ;(function() {
  
    /** Used as a safe reference for `undefined` in pre-ES5 environments. */
    var undefined;
  
    /** Used as the semantic version number. */
    var VERSION = '4.17.4';
  
    /** Used as the size to enable large array optimizations. */
    var LARGE_ARRAY_SIZE = 200;
  
    /** Error message constants. */
    var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',
        FUNC_ERROR_TEXT = 'Expected a function';
  
    /** Used to stand-in for `undefined` hash values. */
    var HASH_UNDEFINED = '__lodash_hash_undefined__';
  
    /** Used as the maximum memoize cache size. */
    var MAX_MEMOIZE_SIZE = 500;
  
    /** Used as the internal argument placeholder. */
    var PLACEHOLDER = '__lodash_placeholder__';
  
    /** Used to compose bitmasks for cloning. */
    var CLONE_DEEP_FLAG = 1,
        CLONE_FLAT_FLAG = 2,
        CLONE_SYMBOLS_FLAG = 4;
  
    /** Used to compose bitmasks for value comparisons. */
    var COMPARE_PARTIAL_FLAG = 1,
        COMPARE_UNORDERED_FLAG = 2;
  
    /** Used to compose bitmasks for function metadata. */
    var WRAP_BIND_FLAG = 1,
        WRAP_BIND_KEY_FLAG = 2,
        WRAP_CURRY_BOUND_FLAG = 4,
        WRAP_CURRY_FLAG = 8,
        WRAP_CURRY_RIGHT_FLAG = 16,
        WRAP_PARTIAL_FLAG = 32,
        WRAP_PARTIAL_RIGHT_FLAG = 64,
        WRAP_ARY_FLAG = 128,
        WRAP_REARG_FLAG = 256,
        WRAP_FLIP_FLAG = 512;
  
    /** Used as default options for `_.truncate`. */
    var DEFAULT_TRUNC_LENGTH = 30,
        DEFAULT_TRUNC_OMISSION = '...';
  
    /** Used to detect hot functions by number of calls within a span of milliseconds. */
    var HOT_COUNT = 800,
        HOT_SPAN = 16;
  
    /** Used to indicate the type of lazy iteratees. */
    var LAZY_FILTER_FLAG = 1,
        LAZY_MAP_FLAG = 2,
        LAZY_WHILE_FLAG = 3;
  
    /** Used as references for various `Number` constants. */
    var INFINITY = 1 / 0,
        MAX_SAFE_INTEGER = 9007199254740991,
        MAX_INTEGER = 1.7976931348623157e+308,
        NAN = 0 / 0;
  
    /** Used as references for the maximum length and index of an array. */
    var MAX_ARRAY_LENGTH = 4294967295,
        MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,
        HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;
  
    /** Used to associate wrap methods with their bit flags. */
    var wrapFlags = [
      ['ary', WRAP_ARY_FLAG],
      ['bind', WRAP_BIND_FLAG],
      ['bindKey', WRAP_BIND_KEY_FLAG],
      ['curry', WRAP_CURRY_FLAG],
      ['curryRight', WRAP_CURRY_RIGHT_FLAG],
      ['flip', WRAP_FLIP_FLAG],
      ['partial', WRAP_PARTIAL_FLAG],
      ['partialRight', WRAP_PARTIAL_RIGHT_FLAG],
      ['rearg', WRAP_REARG_FLAG]
    ];
  
    /** `Object#toString` result references. */
    var argsTag = '[object Arguments]',
        arrayTag = '[object Array]',
        asyncTag = '[object AsyncFunction]',
        boolTag = '[object Boolean]',
        dateTag = '[object Date]',
        domExcTag = '[object DOMException]',
        errorTag = '[object Error]',
        funcTag = '[object Function]',
        genTag = '[object GeneratorFunction]',
        mapTag = '[object Map]',
        numberTag = '[object Number]',
        nullTag = '[object Null]',
        objectTag = '[object Object]',
        promiseTag = '[object Promise]',
        proxyTag = '[object Proxy]',
        regexpTag = '[object RegExp]',
        setTag = '[object Set]',
        stringTag = '[object String]',
        symbolTag = '[object Symbol]',
        undefinedTag = '[object Undefined]',
        weakMapTag = '[object WeakMap]',
        weakSetTag = '[object WeakSet]';
  
    var arrayBufferTag = '[object ArrayBuffer]',
        dataViewTag = '[object DataView]',
        float32Tag = '[object Float32Array]',
        float64Tag = '[object Float64Array]',
        int8Tag = '[object Int8Array]',
        int16Tag = '[object Int16Array]',
        int32Tag = '[object Int32Array]',
        uint8Tag = '[object Uint8Array]',
        uint8ClampedTag = '[object Uint8ClampedArray]',
        uint16Tag = '[object Uint16Array]',
        uint32Tag = '[object Uint32Array]';
  
    /** Used to match empty string literals in compiled template source. */
    var reEmptyStringLeading = /\b__p \+= '';/g,
        reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
        reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;
  
    /** Used to match HTML entities and HTML characters. */
    var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,
        reUnescapedHtml = /[&<>"']/g,
        reHasEscapedHtml = RegExp(reEscapedHtml.source),
        reHasUnescapedHtml = RegExp(reUnescapedHtml.source);
  
    /** Used to match template delimiters. */
    var reEscape = /<%-([\s\S]+?)%>/g,
        reEvaluate = /<%([\s\S]+?)%>/g,
        reInterpolate = /<%=([\s\S]+?)%>/g;
  
    /** Used to match property names within property paths. */
    var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
        reIsPlainProp = /^\w*$/,
        reLeadingDot = /^\./,
        rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;
  
    /**
     * Used to match `RegExp`
     * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
     */
    var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,
        reHasRegExpChar = RegExp(reRegExpChar.source);
  
    /** Used to match leading and trailing whitespace. */
    var reTrim = /^\s+|\s+$/g,
        reTrimStart = /^\s+/,
        reTrimEnd = /\s+$/;
  
    /** Used to match wrap detail comments. */
    var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,
        reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/,
        reSplitDetails = /,? & /;
  
    /** Used to match words composed of alphanumeric characters. */
    var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;
  
    /** Used to match backslashes in property paths. */
    var reEscapeChar = /\\(\\)?/g;
  
    /**
     * Used to match
     * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).
     */
    var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
  
    /** Used to match `RegExp` flags from their coerced string values. */
    var reFlags = /\w*$/;
  
    /** Used to detect bad signed hexadecimal string values. */
    var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
  
    /** Used to detect binary string values. */
    var reIsBinary = /^0b[01]+$/i;
  
    /** Used to detect host constructors (Safari). */
    var reIsHostCtor = /^\[object .+?Constructor\]$/;
  
    /** Used to detect octal string values. */
    var reIsOctal = /^0o[0-7]+$/i;
  
    /** Used to detect unsigned integer values. */
    var reIsUint = /^(?:0|[1-9]\d*)$/;
  
    /** Used to match Latin Unicode letters (excluding mathematical operators). */
    var reLatin = /[\xc0-\xd6\xd8-\xf6\xf8-\xff\u0100-\u017f]/g;
  
    /** Used to ensure capturing order of template delimiters. */
    var reNoMatch = /($^)/;
  
    /** Used to match unescaped characters in compiled string literals. */
    var reUnescapedString = /['\n\r\u2028\u2029\\]/g;
  
    /** Used to compose unicode character classes. */
    var rsAstralRange = '\\ud800-\\udfff',
        rsComboMarksRange = '\\u0300-\\u036f',
        reComboHalfMarksRange = '\\ufe20-\\ufe2f',
        rsComboSymbolsRange = '\\u20d0-\\u20ff',
        rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
        rsDingbatRange = '\\u2700-\\u27bf',
        rsLowerRange = 'a-z\\xdf-\\xf6\\xf8-\\xff',
        rsMathOpRange = '\\xac\\xb1\\xd7\\xf7',
        rsNonCharRange = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf',
        rsPunctuationRange = '\\u2000-\\u206f',
        rsSpaceRange = ' \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000',
        rsUpperRange = 'A-Z\\xc0-\\xd6\\xd8-\\xde',
        rsVarRange = '\\ufe0e\\ufe0f',
        rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange;
  
    /** Used to compose unicode capture groups. */
    var rsApos = "['\u2019]",
        rsAstral = '[' + rsAstralRange + ']',
        rsBreak = '[' + rsBreakRange + ']',
        rsCombo = '[' + rsComboRange + ']',
        rsDigits = '\\d+',
        rsDingbat = '[' + rsDingbatRange + ']',
        rsLower = '[' + rsLowerRange + ']',
        rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']',
        rsFitz = '\\ud83c[\\udffb-\\udfff]',
        rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
        rsNonAstral = '[^' + rsAstralRange + ']',
        rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
        rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
        rsUpper = '[' + rsUpperRange + ']',
        rsZWJ = '\\u200d';
  
    /** Used to compose unicode regexes. */
    var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')',
        rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')',
        rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
        rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
        reOptMod = rsModifier + '?',
        rsOptVar = '[' + rsVarRange + ']?',
        rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
        rsOrdLower = '\\d*(?:(?:1st|2nd|3rd|(?![123])\\dth)\\b)',
        rsOrdUpper = '\\d*(?:(?:1ST|2ND|3RD|(?![123])\\dTH)\\b)',
        rsSeq = rsOptVar + reOptMod + rsOptJoin,
        rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq,
        rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
  
    /** Used to match apostrophes. */
    var reApos = RegExp(rsApos, 'g');
  
    /**
     * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and
     * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols).
     */
    var reComboMark = RegExp(rsCombo, 'g');
  
    /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
    var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
  
    /** Used to match complex or compound words. */
    var reUnicodeWord = RegExp([
      rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
      rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')',
      rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower,
      rsUpper + '+' + rsOptContrUpper,
      rsOrdUpper,
      rsOrdLower,
      rsDigits,
      rsEmoji
    ].join('|'), 'g');
  
    /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
    var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange  + rsComboRange + rsVarRange + ']');
  
    /** Used to detect strings that need a more robust regexp to match words. */
    var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2,}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;
  
    /** Used to assign default `context` object properties. */
    var contextProps = [
      'Array', 'Buffer', 'DataView', 'Date', 'Error', 'Float32Array', 'Float64Array',
      'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',
      'Promise', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array',
      'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
      '_', 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout'
    ];
  
    /** Used to make template sourceURLs easier to identify. */
    var templateCounter = -1;
  
    /** Used to identify `toStringTag` values of typed arrays. */
    var typedArrayTags = {};
    typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
    typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
    typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
    typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
    typedArrayTags[uint32Tag] = true;
    typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
    typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
    typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
    typedArrayTags[errorTag] = typedArrayTags[funcTag] =
    typedArrayTags[mapTag] = typedArrayTags[numberTag] =
    typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
    typedArrayTags[setTag] = typedArrayTags[stringTag] =
    typedArrayTags[weakMapTag] = false;
  
    /** Used to identify `toStringTag` values supported by `_.clone`. */
    var cloneableTags = {};
    cloneableTags[argsTag] = cloneableTags[arrayTag] =
    cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
    cloneableTags[boolTag] = cloneableTags[dateTag] =
    cloneableTags[float32Tag] = cloneableTags[float64Tag] =
    cloneableTags[int8Tag] = cloneableTags[int16Tag] =
    cloneableTags[int32Tag] = cloneableTags[mapTag] =
    cloneableTags[numberTag] = cloneableTags[objectTag] =
    cloneableTags[regexpTag] = cloneableTags[setTag] =
    cloneableTags[stringTag] = cloneableTags[symbolTag] =
    cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
    cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
    cloneableTags[errorTag] = cloneableTags[funcTag] =
    cloneableTags[weakMapTag] = false;
  
    /** Used to map Latin Unicode letters to basic Latin letters. */
    var deburredLetters = {
      // Latin-1 Supplement block.
      '\xc0': 'A',  '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
      '\xe0': 'a',  '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a',
      '\xc7': 'C',  '\xe7': 'c',
      '\xd0': 'D',  '\xf0': 'd',
      '\xc8': 'E',  '\xc9': 'E', '\xca': 'E', '\xcb': 'E',
      '\xe8': 'e',  '\xe9': 'e', '\xea': 'e', '\xeb': 'e',
      '\xcc': 'I',  '\xcd': 'I', '\xce': 'I', '\xcf': 'I',
      '\xec': 'i',  '\xed': 'i', '\xee': 'i', '\xef': 'i',
      '\xd1': 'N',  '\xf1': 'n',
      '\xd2': 'O',  '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O',
      '\xf2': 'o',  '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o',
      '\xd9': 'U',  '\xda': 'U', '\xdb': 'U', '\xdc': 'U',
      '\xf9': 'u',  '\xfa': 'u', '\xfb': 'u', '\xfc': 'u',
      '\xdd': 'Y',  '\xfd': 'y', '\xff': 'y',
      '\xc6': 'Ae', '\xe6': 'ae',
      '\xde': 'Th', '\xfe': 'th',
      '\xdf': 'ss',
      // Latin Extended-A block.
      '\u0100': 'A',  '\u0102': 'A', '\u0104': 'A',
      '\u0101': 'a',  '\u0103': 'a', '\u0105': 'a',
      '\u0106': 'C',  '\u0108': 'C', '\u010a': 'C', '\u010c': 'C',
      '\u0107': 'c',  '\u0109': 'c', '\u010b': 'c', '\u010d': 'c',
      '\u010e': 'D',  '\u0110': 'D', '\u010f': 'd', '\u0111': 'd',
      '\u0112': 'E',  '\u0114': 'E', '\u0116': 'E', '\u0118': 'E', '\u011a': 'E',
      '\u0113': 'e',  '\u0115': 'e', '\u0117': 'e', '\u0119': 'e', '\u011b': 'e',
      '\u011c': 'G',  '\u011e': 'G', '\u0120': 'G', '\u0122': 'G',
      '\u011d': 'g',  '\u011f': 'g', '\u0121': 'g', '\u0123': 'g',
      '\u0124': 'H',  '\u0126': 'H', '\u0125': 'h', '\u0127': 'h',
      '\u0128': 'I',  '\u012a': 'I', '\u012c': 'I', '\u012e': 'I', '\u0130': 'I',
      '\u0129': 'i',  '\u012b': 'i', '\u012d': 'i', '\u012f': 'i', '\u0131': 'i',
      '\u0134': 'J',  '\u0135': 'j',
      '\u0136': 'K',  '\u0137': 'k', '\u0138': 'k',
      '\u0139': 'L',  '\u013b': 'L', '\u013d': 'L', '\u013f': 'L', '\u0141': 'L',
      '\u013a': 'l',  '\u013c': 'l', '\u013e': 'l', '\u0140': 'l', '\u0142': 'l',
      '\u0143': 'N',  '\u0145': 'N', '\u0147': 'N', '\u014a': 'N',
      '\u0144': 'n',  '\u0146': 'n', '\u0148': 'n', '\u014b': 'n',
      '\u014c': 'O',  '\u014e': 'O', '\u0150': 'O',
      '\u014d': 'o',  '\u014f': 'o', '\u0151': 'o',
      '\u0154': 'R',  '\u0156': 'R', '\u0158': 'R',
      '\u0155': 'r',  '\u0157': 'r', '\u0159': 'r',
      '\u015a': 'S',  '\u015c': 'S', '\u015e': 'S', '\u0160': 'S',
      '\u015b': 's',  '\u015d': 's', '\u015f': 's', '\u0161': 's',
      '\u0162': 'T',  '\u0164': 'T', '\u0166': 'T',
      '\u0163': 't',  '\u0165': 't', '\u0167': 't',
      '\u0168': 'U',  '\u016a': 'U', '\u016c': 'U', '\u016e': 'U', '\u0170': 'U', '\u0172': 'U',
      '\u0169': 'u',  '\u016b': 'u', '\u016d': 'u', '\u016f': 'u', '\u0171': 'u', '\u0173': 'u',
      '\u0174': 'W',  '\u0175': 'w',
      '\u0176': 'Y',  '\u0177': 'y', '\u0178': 'Y',
      '\u0179': 'Z',  '\u017b': 'Z', '\u017d': 'Z',
      '\u017a': 'z',  '\u017c': 'z', '\u017e': 'z',
      '\u0132': 'IJ', '\u0133': 'ij',
      '\u0152': 'Oe', '\u0153': 'oe',
      '\u0149': "'n", '\u017f': 's'
    };
  
    /** Used to map characters to HTML entities. */
    var htmlEscapes = {
      '&': '&amp;',
      '<': '&lt;',
      '>': '&gt;',
      '"': '&quot;',
      "'": '&#39;'
    };
  
    /** Used to map HTML entities to characters. */
    var htmlUnescapes = {
      '&amp;': '&',
      '&lt;': '<',
      '&gt;': '>',
      '&quot;': '"',
      '&#39;': "'"
    };
  
    /** Used to escape characters for inclusion in compiled string literals. */
    var stringEscapes = {
      '\\': '\\',
      "'": "'",
      '\n': 'n',
      '\r': 'r',
      '\u2028': 'u2028',
      '\u2029': 'u2029'
    };
  
    /** Built-in method references without a dependency on `root`. */
    var freeParseFloat = parseFloat,
        freeParseInt = parseInt;
  
    /** Detect free variable `global` from Node.js. */
    var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
  
    /** Detect free variable `self`. */
    var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
  
    /** Used as a reference to the global object. */
    var root = freeGlobal || freeSelf || Function('return this')();
  
    /** Detect free variable `exports`. */
    var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
  
    /** Detect free variable `module`. */
    var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
  
    /** Detect the popular CommonJS extension `module.exports`. */
    var moduleExports = freeModule && freeModule.exports === freeExports;
  
    /** Detect free variable `process` from Node.js. */
    var freeProcess = moduleExports && freeGlobal.process;
  
    /** Used to access faster Node.js helpers. */
    var nodeUtil = (function() {
      try {
        return freeProcess && freeProcess.binding && freeProcess.binding('util');
      } catch (e) {}
    }());
  
    /* Node.js helper references. */
    var nodeIsArrayBuffer = nodeUtil && nodeUtil.isArrayBuffer,
        nodeIsDate = nodeUtil && nodeUtil.isDate,
        nodeIsMap = nodeUtil && nodeUtil.isMap,
        nodeIsRegExp = nodeUtil && nodeUtil.isRegExp,
        nodeIsSet = nodeUtil && nodeUtil.isSet,
        nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;
  
    /*--------------------------------------------------------------------------*/
  
    /**
     * Adds the key-value `pair` to `map`.
     *
     * @private
     * @param {Object} map The map to modify.
     * @param {Array} pair The key-value pair to add.
     * @returns {Object} Returns `map`.
     */
    function addMapEntry(map, pair) {
      // Don't return `map.set` because it's not chainable in IE 11.
      map.set(pair[0], pair[1]);
      return map;
    }
  
    /**
     * Adds `value` to `set`.
     *
     * @private
     * @param {Object} set The set to modify.
     * @param {*} value The value to add.
     * @returns {Object} Returns `set`.
     */
    function addSetEntry(set, value) {
      // Don't return `set.add` because it's not chainable in IE 11.
      set.add(value);
      return set;
    }
  
    /**
     * A faster alternative to `Function#apply`, this function invokes `func`
     * with the `this` binding of `thisArg` and the arguments of `args`.
     *
     * @private
     * @param {Function} func The function to invoke.
     * @param {*} thisArg The `this` binding of `func`.
     * @param {Array} args The arguments to invoke `func` with.
     * @returns {*} Returns the result of `func`.
     */
    function apply(func, thisArg, args) {
      switch (args.length) {
        case 0: return func.call(thisArg);
        case 1: return func.call(thisArg, args[0]);
        case 2: return func.call(thisArg, args[0], args[1]);
        case 3: return func.call(thisArg, args[0], args[1], args[2]);
      }
      return func.apply(thisArg, args);
    }
  
    /**
     * A specialized version of `baseAggregator` for arrays.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} setter The function to set `accumulator` values.
     * @param {Function} iteratee The iteratee to transform keys.
     * @param {Object} accumulator The initial aggregated object.
     * @returns {Function} Returns `accumulator`.
     */
    function arrayAggregator(array, setter, iteratee, accumulator) {
      var index = -1,
          length = array == null ? 0 : array.length;
  
      while (++index < length) {
        var value = array[index];
        setter(accumulator, value, iteratee(value), array);
      }
      return accumulator;
    }
  
    /**
     * A specialized version of `_.forEach` for arrays without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns `array`.
     */
    function arrayEach(array, iteratee) {
      var index = -1,
          length = array == null ? 0 : array.length;
  
      while (++index < length) {
        if (iteratee(array[index], index, array) === false) {
          break;
        }
      }
      return array;
    }
  
    /**
     * A specialized version of `_.forEachRight` for arrays without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns `array`.
     */
    function arrayEachRight(array, iteratee) {
      var length = array == null ? 0 : array.length;
  
      while (length--) {
        if (iteratee(array[length], length, array) === false) {
          break;
        }
      }
      return array;
    }
  
    /**
     * A specialized version of `_.every` for arrays without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {boolean} Returns `true` if all elements pass the predicate check,
     *  else `false`.
     */
    function arrayEvery(array, predicate) {
      var index = -1,
          length = array == null ? 0 : array.length;
  
      while (++index < length) {
        if (!predicate(array[index], index, array)) {
          return false;
        }
      }
      return true;
    }
  
    /**
     * A specialized version of `_.filter` for arrays without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {Array} Returns the new filtered array.
     */
    function arrayFilter(array, predicate) {
      var index = -1,
          length = array == null ? 0 : array.length,
          resIndex = 0,
          result = [];
  
      while (++index < length) {
        var value = array[index];
        if (predicate(value, index, array)) {
          result[resIndex++] = value;
        }
      }
      return result;
    }
  
    /**
     * A specialized version of `_.includes` for arrays without support for
     * specifying an index to search from.
     *
     * @private
     * @param {Array} [array] The array to inspect.
     * @param {*} target The value to search for.
     * @returns {boolean} Returns `true` if `target` is found, else `false`.
     */
    function arrayIncludes(array, value) {
      var length = array == null ? 0 : array.length;
      return !!length && baseIndexOf(array, value, 0) > -1;
    }
  
    /**
     * This function is like `arrayIncludes` except that it accepts a comparator.
     *
     * @private
     * @param {Array} [array] The array to inspect.
     * @param {*} target The value to search for.
     * @param {Function} comparator The comparator invoked per element.
     * @returns {boolean} Returns `true` if `target` is found, else `false`.
     */
    function arrayIncludesWith(array, value, comparator) {
      var index = -1,
          length = array == null ? 0 : array.length;
  
      while (++index < length) {
        if (comparator(value, array[index])) {
          return true;
        }
      }
      return false;
    }
  
    /**
     * A specialized version of `_.map` for arrays without support for iteratee
     * shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns the new mapped array.
     */
    function arrayMap(array, iteratee) {
      var index = -1,
          length = array == null ? 0 : array.length,
          result = Array(length);
  
      while (++index < length) {
        result[index] = iteratee(array[index], index, array);
      }
      return result;
    }
  
    /**
     * Appends the elements of `values` to `array`.
     *
     * @private
     * @param {Array} array The array to modify.
     * @param {Array} values The values to append.
     * @returns {Array} Returns `array`.
     */
    function arrayPush(array, values) {
      var index = -1,
          length = values.length,
          offset = array.length;
  
      while (++index < length) {
        array[offset + index] = values[index];
      }
      return array;
    }
  
    /**
     * A specialized version of `_.reduce` for arrays without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {*} [accumulator] The initial value.
     * @param {boolean} [initAccum] Specify using the first element of `array` as
     *  the initial value.
     * @returns {*} Returns the accumulated value.
     */
    function arrayReduce(array, iteratee, accumulator, initAccum) {
      var index = -1,
          length = array == null ? 0 : array.length;
  
      if (initAccum && length) {
        accumulator = array[++index];
      }
      while (++index < length) {
        accumulator = iteratee(accumulator, array[index], index, array);
      }
      return accumulator;
    }
  
    /**
     * A specialized version of `_.reduceRight` for arrays without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {*} [accumulator] The initial value.
     * @param {boolean} [initAccum] Specify using the last element of `array` as
     *  the initial value.
     * @returns {*} Returns the accumulated value.
     */
    function arrayReduceRight(array, iteratee, accumulator, initAccum) {
      var length = array == null ? 0 : array.length;
      if (initAccum && length) {
        accumulator = array[--length];
      }
      while (length--) {
        accumulator = iteratee(accumulator, array[length], length, array);
      }
      return accumulator;
    }
  
    /**
     * A specialized version of `_.some` for arrays without support for iteratee
     * shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {boolean} Returns `true` if any element passes the predicate check,
     *  else `false`.
     */
    function arraySome(array, predicate) {
      var index = -1,
          length = array == null ? 0 : array.length;
  
      while (++index < length) {
        if (predicate(array[index], index, array)) {
          return true;
        }
      }
      return false;
    }
  
    /**
     * Gets the size of an ASCII `string`.
     *
     * @private
     * @param {string} string The string inspect.
     * @returns {number} Returns the string size.
     */
    var asciiSize = baseProperty('length');
  
    /**
     * Converts an ASCII `string` to an array.
     *
     * @private
     * @param {string} string The string to convert.
     * @returns {Array} Returns the converted array.
     */
    function asciiToArray(string) {
      return string.split('');
    }
  
    /**
     * Splits an ASCII `string` into an array of its words.
     *
     * @private
     * @param {string} The string to inspect.
     * @returns {Array} Returns the words of `string`.
     */
    function asciiWords(string) {
      return string.match(reAsciiWord) || [];
    }
  
    /**
     * The base implementation of methods like `_.findKey` and `_.findLastKey`,
     * without support for iteratee shorthands, which iterates over `collection`
     * using `eachFunc`.
     *
     * @private
     * @param {Array|Object} collection The collection to inspect.
     * @param {Function} predicate The function invoked per iteration.
     * @param {Function} eachFunc The function to iterate over `collection`.
     * @returns {*} Returns the found element or its key, else `undefined`.
     */
    function baseFindKey(collection, predicate, eachFunc) {
      var result;
      eachFunc(collection, function(value, key, collection) {
        if (predicate(value, key, collection)) {
          result = key;
          return false;
        }
      });
      return result;
    }
  
    /**
     * The base implementation of `_.findIndex` and `_.findLastIndex` without
     * support for iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {Function} predicate The function invoked per iteration.
     * @param {number} fromIndex The index to search from.
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {number} Returns the index of the matched value, else `-1`.
     */
    function baseFindIndex(array, predicate, fromIndex, fromRight) {
      var length = array.length,
          index = fromIndex + (fromRight ? 1 : -1);
  
      while ((fromRight ? index-- : ++index < length)) {
        if (predicate(array[index], index, array)) {
          return index;
        }
      }
      return -1;
    }
  
    /**
     * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @param {number} fromIndex The index to search from.
     * @returns {number} Returns the index of the matched value, else `-1`.
     */
    function baseIndexOf(array, value, fromIndex) {
      return value === value
        ? strictIndexOf(array, value, fromIndex)
        : baseFindIndex(array, baseIsNaN, fromIndex);
    }
  
    /**
     * This function is like `baseIndexOf` except that it accepts a comparator.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @param {number} fromIndex The index to search from.
     * @param {Function} comparator The comparator invoked per element.
     * @returns {number} Returns the index of the matched value, else `-1`.
     */
    function baseIndexOfWith(array, value, fromIndex, comparator) {
      var index = fromIndex - 1,
          length = array.length;
  
      while (++index < length) {
        if (comparator(array[index], value)) {
          return index;
        }
      }
      return -1;
    }
  
    /**
     * The base implementation of `_.isNaN` without support for number objects.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
     */
    function baseIsNaN(value) {
      return value !== value;
    }
  
    /**
     * The base implementation of `_.mean` and `_.meanBy` without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {number} Returns the mean.
     */
    function baseMean(array, iteratee) {
      var length = array == null ? 0 : array.length;
      return length ? (baseSum(array, iteratee) / length) : NAN;
    }
  
    /**
     * The base implementation of `_.property` without support for deep paths.
     *
     * @private
     * @param {string} key The key of the property to get.
     * @returns {Function} Returns the new accessor function.
     */
    function baseProperty(key) {
      return function(object) {
        return object == null ? undefined : object[key];
      };
    }
  
    /**
     * The base implementation of `_.propertyOf` without support for deep paths.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Function} Returns the new accessor function.
     */
    function basePropertyOf(object) {
      return function(key) {
        return object == null ? undefined : object[key];
      };
    }
  
    /**
     * The base implementation of `_.reduce` and `_.reduceRight`, without support
     * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {*} accumulator The initial value.
     * @param {boolean} initAccum Specify using the first or last element of
     *  `collection` as the initial value.
     * @param {Function} eachFunc The function to iterate over `collection`.
     * @returns {*} Returns the accumulated value.
     */
    function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
      eachFunc(collection, function(value, index, collection) {
        accumulator = initAccum
          ? (initAccum = false, value)
          : iteratee(accumulator, value, index, collection);
      });
      return accumulator;
    }
  
    /**
     * The base implementation of `_.sortBy` which uses `comparer` to define the
     * sort order of `array` and replaces criteria objects with their corresponding
     * values.
     *
     * @private
     * @param {Array} array The array to sort.
     * @param {Function} comparer The function to define sort order.
     * @returns {Array} Returns `array`.
     */
    function baseSortBy(array, comparer) {
      var length = array.length;
  
      array.sort(comparer);
      while (length--) {
        array[length] = array[length].value;
      }
      return array;
    }
  
    /**
     * The base implementation of `_.sum` and `_.sumBy` without support for
     * iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {number} Returns the sum.
     */
    function baseSum(array, iteratee) {
      var result,
          index = -1,
          length = array.length;
  
      while (++index < length) {
        var current = iteratee(array[index]);
        if (current !== undefined) {
          result = result === undefined ? current : (result + current);
        }
      }
      return result;
    }
  
    /**
     * The base implementation of `_.times` without support for iteratee shorthands
     * or max array length checks.
     *
     * @private
     * @param {number} n The number of times to invoke `iteratee`.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns the array of results.
     */
    function baseTimes(n, iteratee) {
      var index = -1,
          result = Array(n);
  
      while (++index < n) {
        result[index] = iteratee(index);
      }
      return result;
    }
  
    /**
     * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array
     * of key-value pairs for `object` corresponding to the property names of `props`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array} props The property names to get values for.
     * @returns {Object} Returns the key-value pairs.
     */
    function baseToPairs(object, props) {
      return arrayMap(props, function(key) {
        return [key, object[key]];
      });
    }
  
    /**
     * The base implementation of `_.unary` without support for storing metadata.
     *
     * @private
     * @param {Function} func The function to cap arguments for.
     * @returns {Function} Returns the new capped function.
     */
    function baseUnary(func) {
      return function(value) {
        return func(value);
      };
    }
  
    /**
     * The base implementation of `_.values` and `_.valuesIn` which creates an
     * array of `object` property values corresponding to the property names
     * of `props`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array} props The property names to get values for.
     * @returns {Object} Returns the array of property values.
     */
    function baseValues(object, props) {
      return arrayMap(props, function(key) {
        return object[key];
      });
    }
  
    /**
     * Checks if a `cache` value for `key` exists.
     *
     * @private
     * @param {Object} cache The cache to query.
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function cacheHas(cache, key) {
      return cache.has(key);
    }
  
    /**
     * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
     * that is not found in the character symbols.
     *
     * @private
     * @param {Array} strSymbols The string symbols to inspect.
     * @param {Array} chrSymbols The character symbols to find.
     * @returns {number} Returns the index of the first unmatched string symbol.
     */
    function charsStartIndex(strSymbols, chrSymbols) {
      var index = -1,
          length = strSymbols.length;
  
      while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
      return index;
    }
  
    /**
     * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
     * that is not found in the character symbols.
     *
     * @private
     * @param {Array} strSymbols The string symbols to inspect.
     * @param {Array} chrSymbols The character symbols to find.
     * @returns {number} Returns the index of the last unmatched string symbol.
     */
    function charsEndIndex(strSymbols, chrSymbols) {
      var index = strSymbols.length;
  
      while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
      return index;
    }
  
    /**
     * Gets the number of `placeholder` occurrences in `array`.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {*} placeholder The placeholder to search for.
     * @returns {number} Returns the placeholder count.
     */
    function countHolders(array, placeholder) {
      var length = array.length,
          result = 0;
  
      while (length--) {
        if (array[length] === placeholder) {
          ++result;
        }
      }
      return result;
    }
  
    /**
     * Used by `_.deburr` to convert Latin-1 Supplement and Latin Extended-A
     * letters to basic Latin letters.
     *
     * @private
     * @param {string} letter The matched letter to deburr.
     * @returns {string} Returns the deburred letter.
     */
    var deburrLetter = basePropertyOf(deburredLetters);
  
    /**
     * Used by `_.escape` to convert characters to HTML entities.
     *
     * @private
     * @param {string} chr The matched character to escape.
     * @returns {string} Returns the escaped character.
     */
    var escapeHtmlChar = basePropertyOf(htmlEscapes);
  
    /**
     * Used by `_.template` to escape characters for inclusion in compiled string literals.
     *
     * @private
     * @param {string} chr The matched character to escape.
     * @returns {string} Returns the escaped character.
     */
    function escapeStringChar(chr) {
      return '\\' + stringEscapes[chr];
    }
  
    /**
     * Gets the value at `key` of `object`.
     *
     * @private
     * @param {Object} [object] The object to query.
     * @param {string} key The key of the property to get.
     * @returns {*} Returns the property value.
     */
    function getValue(object, key) {
      return object == null ? undefined : object[key];
    }
  
    /**
     * Checks if `string` contains Unicode symbols.
     *
     * @private
     * @param {string} string The string to inspect.
     * @returns {boolean} Returns `true` if a symbol is found, else `false`.
     */
    function hasUnicode(string) {
      return reHasUnicode.test(string);
    }
  
    /**
     * Checks if `string` contains a word composed of Unicode symbols.
     *
     * @private
     * @param {string} string The string to inspect.
     * @returns {boolean} Returns `true` if a word is found, else `false`.
     */
    function hasUnicodeWord(string) {
      return reHasUnicodeWord.test(string);
    }
  
    /**
     * Converts `iterator` to an array.
     *
     * @private
     * @param {Object} iterator The iterator to convert.
     * @returns {Array} Returns the converted array.
     */
    function iteratorToArray(iterator) {
      var data,
          result = [];
  
      while (!(data = iterator.next()).done) {
        result.push(data.value);
      }
      return result;
    }
  
    /**
     * Converts `map` to its key-value pairs.
     *
     * @private
     * @param {Object} map The map to convert.
     * @returns {Array} Returns the key-value pairs.
     */
    function mapToArray(map) {
      var index = -1,
          result = Array(map.size);
  
      map.forEach(function(value, key) {
        result[++index] = [key, value];
      });
      return result;
    }
  
    /**
     * Creates a unary function that invokes `func` with its argument transformed.
     *
     * @private
     * @param {Function} func The function to wrap.
     * @param {Function} transform The argument transform.
     * @returns {Function} Returns the new function.
     */
    function overArg(func, transform) {
      return function(arg) {
        return func(transform(arg));
      };
    }
  
    /**
     * Replaces all `placeholder` elements in `array` with an internal placeholder
     * and returns an array of their indexes.
     *
     * @private
     * @param {Array} array The array to modify.
     * @param {*} placeholder The placeholder to replace.
     * @returns {Array} Returns the new array of placeholder indexes.
     */
    function replaceHolders(array, placeholder) {
      var index = -1,
          length = array.length,
          resIndex = 0,
          result = [];
  
      while (++index < length) {
        var value = array[index];
        if (value === placeholder || value === PLACEHOLDER) {
          array[index] = PLACEHOLDER;
          result[resIndex++] = index;
        }
      }
      return result;
    }
  
    /**
     * Converts `set` to an array of its values.
     *
     * @private
     * @param {Object} set The set to convert.
     * @returns {Array} Returns the values.
     */
    function setToArray(set) {
      var index = -1,
          result = Array(set.size);
  
      set.forEach(function(value) {
        result[++index] = value;
      });
      return result;
    }
  
    /**
     * Converts `set` to its value-value pairs.
     *
     * @private
     * @param {Object} set The set to convert.
     * @returns {Array} Returns the value-value pairs.
     */
    function setToPairs(set) {
      var index = -1,
          result = Array(set.size);
  
      set.forEach(function(value) {
        result[++index] = [value, value];
      });
      return result;
    }
  
    /**
     * A specialized version of `_.indexOf` which performs strict equality
     * comparisons of values, i.e. `===`.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @param {number} fromIndex The index to search from.
     * @returns {number} Returns the index of the matched value, else `-1`.
     */
    function strictIndexOf(array, value, fromIndex) {
      var index = fromIndex - 1,
          length = array.length;
  
      while (++index < length) {
        if (array[index] === value) {
          return index;
        }
      }
      return -1;
    }
  
    /**
     * A specialized version of `_.lastIndexOf` which performs strict equality
     * comparisons of values, i.e. `===`.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @param {number} fromIndex The index to search from.
     * @returns {number} Returns the index of the matched value, else `-1`.
     */
    function strictLastIndexOf(array, value, fromIndex) {
      var index = fromIndex + 1;
      while (index--) {
        if (array[index] === value) {
          return index;
        }
      }
      return index;
    }
  
    /**
     * Gets the number of symbols in `string`.
     *
     * @private
     * @param {string} string The string to inspect.
     * @returns {number} Returns the string size.
     */
    function stringSize(string) {
      return hasUnicode(string)
        ? unicodeSize(string)
        : asciiSize(string);
    }
  
    /**
     * Converts `string` to an array.
     *
     * @private
     * @param {string} string The string to convert.
     * @returns {Array} Returns the converted array.
     */
    function stringToArray(string) {
      return hasUnicode(string)
        ? unicodeToArray(string)
        : asciiToArray(string);
    }
  
    /**
     * Used by `_.unescape` to convert HTML entities to characters.
     *
     * @private
     * @param {string} chr The matched character to unescape.
     * @returns {string} Returns the unescaped character.
     */
    var unescapeHtmlChar = basePropertyOf(htmlUnescapes);
  
    /**
     * Gets the size of a Unicode `string`.
     *
     * @private
     * @param {string} string The string inspect.
     * @returns {number} Returns the string size.
     */
    function unicodeSize(string) {
      var result = reUnicode.lastIndex = 0;
      while (reUnicode.test(string)) {
        ++result;
      }
      return result;
    }
  
    /**
     * Converts a Unicode `string` to an array.
     *
     * @private
     * @param {string} string The string to convert.
     * @returns {Array} Returns the converted array.
     */
    function unicodeToArray(string) {
      return string.match(reUnicode) || [];
    }
  
    /**
     * Splits a Unicode `string` into an array of its words.
     *
     * @private
     * @param {string} The string to inspect.
     * @returns {Array} Returns the words of `string`.
     */
    function unicodeWords(string) {
      return string.match(reUnicodeWord) || [];
    }
  
    /*--------------------------------------------------------------------------*/
  
    /**
     * Create a new pristine `lodash` function using the `context` object.
     *
     * @static
     * @memberOf _
     * @since 1.1.0
     * @category Util
     * @param {Object} [context=root] The context object.
     * @returns {Function} Returns a new `lodash` function.
     * @example
     *
     * _.mixin({ 'foo': _.constant('foo') });
     *
     * var lodash = _.runInContext();
     * lodash.mixin({ 'bar': lodash.constant('bar') });
     *
     * _.isFunction(_.foo);
     * // => true
     * _.isFunction(_.bar);
     * // => false
     *
     * lodash.isFunction(lodash.foo);
     * // => false
     * lodash.isFunction(lodash.bar);
     * // => true
     *
     * // Create a suped-up `defer` in Node.js.
     * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
     */
    var runInContext = (function runInContext(context) {
      context = context == null ? root : _.defaults(root.Object(), context, _.pick(root, contextProps));
  
      /** Built-in constructor references. */
      var Array = context.Array,
          Date = context.Date,
          Error = context.Error,
          Function = context.Function,
          Math = context.Math,
          Object = context.Object,
          RegExp = context.RegExp,
          String = context.String,
          TypeError = context.TypeError;
  
      /** Used for built-in method references. */
      var arrayProto = Array.prototype,
          funcProto = Function.prototype,
          objectProto = Object.prototype;
  
      /** Used to detect overreaching core-js shims. */
      var coreJsData = context['__core-js_shared__'];
  
      /** Used to resolve the decompiled source of functions. */
      var funcToString = funcProto.toString;
  
      /** Used to check objects for own properties. */
      var hasOwnProperty = objectProto.hasOwnProperty;
  
      /** Used to generate unique IDs. */
      var idCounter = 0;
  
      /** Used to detect methods masquerading as native. */
      var maskSrcKey = (function() {
        var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
        return uid ? ('Symbol(src)_1.' + uid) : '';
      }());
  
      /**
       * Used to resolve the
       * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
       * of values.
       */
      var nativeObjectToString = objectProto.toString;
  
      /** Used to infer the `Object` constructor. */
      var objectCtorString = funcToString.call(Object);
  
      /** Used to restore the original `_` reference in `_.noConflict`. */
      var oldDash = root._;
  
      /** Used to detect if a method is native. */
      var reIsNative = RegExp('^' +
        funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
        .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
      );
  
      /** Built-in value references. */
      var Buffer = moduleExports ? context.Buffer : undefined,
          Symbol = context.Symbol,
          Uint8Array = context.Uint8Array,
          allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined,
          getPrototype = overArg(Object.getPrototypeOf, Object),
          objectCreate = Object.create,
          propertyIsEnumerable = objectProto.propertyIsEnumerable,
          splice = arrayProto.splice,
          spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined,
          symIterator = Symbol ? Symbol.iterator : undefined,
          symToStringTag = Symbol ? Symbol.toStringTag : undefined;
  
      var defineProperty = (function() {
        try {
          var func = getNative(Object, 'defineProperty');
          func({}, '', {});
          return func;
        } catch (e) {}
      }());
  
      /** Mocked built-ins. */
      var ctxClearTimeout = context.clearTimeout !== root.clearTimeout && context.clearTimeout,
          ctxNow = Date && Date.now !== root.Date.now && Date.now,
          ctxSetTimeout = context.setTimeout !== root.setTimeout && context.setTimeout;
  
      /* Built-in method references for those with the same name as other `lodash` methods. */
      var nativeCeil = Math.ceil,
          nativeFloor = Math.floor,
          nativeGetSymbols = Object.getOwnPropertySymbols,
          nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
          nativeIsFinite = context.isFinite,
          nativeJoin = arrayProto.join,
          nativeKeys = overArg(Object.keys, Object),
          nativeMax = Math.max,
          nativeMin = Math.min,
          nativeNow = Date.now,
          nativeParseInt = context.parseInt,
          nativeRandom = Math.random,
          nativeReverse = arrayProto.reverse;
  
      /* Built-in method references that are verified to be native. */
      var DataView = getNative(context, 'DataView'),
          Map = getNative(context, 'Map'),
          Promise = getNative(context, 'Promise'),
          Set = getNative(context, 'Set'),
          WeakMap = getNative(context, 'WeakMap'),
          nativeCreate = getNative(Object, 'create');
  
      /** Used to store function metadata. */
      var metaMap = WeakMap && new WeakMap;
  
      /** Used to lookup unminified function names. */
      var realNames = {};
  
      /** Used to detect maps, sets, and weakmaps. */
      var dataViewCtorString = toSource(DataView),
          mapCtorString = toSource(Map),
          promiseCtorString = toSource(Promise),
          setCtorString = toSource(Set),
          weakMapCtorString = toSource(WeakMap);
  
      /** Used to convert symbols to primitives and strings. */
      var symbolProto = Symbol ? Symbol.prototype : undefined,
          symbolValueOf = symbolProto ? symbolProto.valueOf : undefined,
          symbolToString = symbolProto ? symbolProto.toString : undefined;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates a `lodash` object which wraps `value` to enable implicit method
       * chain sequences. Methods that operate on and return arrays, collections,
       * and functions can be chained together. Methods that retrieve a single value
       * or may return a primitive value will automatically end the chain sequence
       * and return the unwrapped value. Otherwise, the value must be unwrapped
       * with `_#value`.
       *
       * Explicit chain sequences, which must be unwrapped with `_#value`, may be
       * enabled using `_.chain`.
       *
       * The execution of chained methods is lazy, that is, it's deferred until
       * `_#value` is implicitly or explicitly called.
       *
       * Lazy evaluation allows several methods to support shortcut fusion.
       * Shortcut fusion is an optimization to merge iteratee calls; this avoids
       * the creation of intermediate arrays and can greatly reduce the number of
       * iteratee executions. Sections of a chain sequence qualify for shortcut
       * fusion if the section is applied to an array and iteratees accept only
       * one argument. The heuristic for whether a section qualifies for shortcut
       * fusion is subject to change.
       *
       * Chaining is supported in custom builds as long as the `_#value` method is
       * directly or indirectly included in the build.
       *
       * In addition to lodash methods, wrappers have `Array` and `String` methods.
       *
       * The wrapper `Array` methods are:
       * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`
       *
       * The wrapper `String` methods are:
       * `replace` and `split`
       *
       * The wrapper methods that support shortcut fusion are:
       * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,
       * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,
       * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
       *
       * The chainable wrapper methods are:
       * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
       * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
       * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
       * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,
       * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,
       * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,
       * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,
       * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,
       * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,
       * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,
       * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,
       * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,
       * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,
       * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,
       * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,
       * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,
       * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,
       * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,
       * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,
       * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,
       * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,
       * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,
       * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,
       * `zipObject`, `zipObjectDeep`, and `zipWith`
       *
       * The wrapper methods that are **not** chainable by default are:
       * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
       * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,
       * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,
       * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
       * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,
       * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,
       * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,
       * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,
       * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,
       * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,
       * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
       * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
       * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,
       * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,
       * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,
       * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,
       * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,
       * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,
       * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
       * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,
       * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,
       * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,
       * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,
       * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,
       * `upperFirst`, `value`, and `words`
       *
       * @name _
       * @constructor
       * @category Seq
       * @param {*} value The value to wrap in a `lodash` instance.
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * function square(n) {
       *   return n * n;
       * }
       *
       * var wrapped = _([1, 2, 3]);
       *
       * // Returns an unwrapped value.
       * wrapped.reduce(_.add);
       * // => 6
       *
       * // Returns a wrapped value.
       * var squares = wrapped.map(square);
       *
       * _.isArray(squares);
       * // => false
       *
       * _.isArray(squares.value());
       * // => true
       */
      function lodash(value) {
        if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
          if (value instanceof LodashWrapper) {
            return value;
          }
          if (hasOwnProperty.call(value, '__wrapped__')) {
            return wrapperClone(value);
          }
        }
        return new LodashWrapper(value);
      }
  
      /**
       * The base implementation of `_.create` without support for assigning
       * properties to the created object.
       *
       * @private
       * @param {Object} proto The object to inherit from.
       * @returns {Object} Returns the new object.
       */
      var baseCreate = (function() {
        function object() {}
        return function(proto) {
          if (!isObject(proto)) {
            return {};
          }
          if (objectCreate) {
            return objectCreate(proto);
          }
          object.prototype = proto;
          var result = new object;
          object.prototype = undefined;
          return result;
        };
      }());
  
      /**
       * The function whose prototype chain sequence wrappers inherit from.
       *
       * @private
       */
      function baseLodash() {
        // No operation performed.
      }
  
      /**
       * The base constructor for creating `lodash` wrapper objects.
       *
       * @private
       * @param {*} value The value to wrap.
       * @param {boolean} [chainAll] Enable explicit method chain sequences.
       */
      function LodashWrapper(value, chainAll) {
        this.__wrapped__ = value;
        this.__actions__ = [];
        this.__chain__ = !!chainAll;
        this.__index__ = 0;
        this.__values__ = undefined;
      }
  
      /**
       * By default, the template delimiters used by lodash are like those in
       * embedded Ruby (ERB) as well as ES2015 template strings. Change the
       * following template settings to use alternative delimiters.
       *
       * @static
       * @memberOf _
       * @type {Object}
       */
      lodash.templateSettings = {
  
        /**
         * Used to detect `data` property values to be HTML-escaped.
         *
         * @memberOf _.templateSettings
         * @type {RegExp}
         */
        'escape': reEscape,
  
        /**
         * Used to detect code to be evaluated.
         *
         * @memberOf _.templateSettings
         * @type {RegExp}
         */
        'evaluate': reEvaluate,
  
        /**
         * Used to detect `data` property values to inject.
         *
         * @memberOf _.templateSettings
         * @type {RegExp}
         */
        'interpolate': reInterpolate,
  
        /**
         * Used to reference the data object in the template text.
         *
         * @memberOf _.templateSettings
         * @type {string}
         */
        'variable': '',
  
        /**
         * Used to import variables into the compiled template.
         *
         * @memberOf _.templateSettings
         * @type {Object}
         */
        'imports': {
  
          /**
           * A reference to the `lodash` function.
           *
           * @memberOf _.templateSettings.imports
           * @type {Function}
           */
          '_': lodash
        }
      };
  
      // Ensure wrappers are instances of `baseLodash`.
      lodash.prototype = baseLodash.prototype;
      lodash.prototype.constructor = lodash;
  
      LodashWrapper.prototype = baseCreate(baseLodash.prototype);
      LodashWrapper.prototype.constructor = LodashWrapper;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
       *
       * @private
       * @constructor
       * @param {*} value The value to wrap.
       */
      function LazyWrapper(value) {
        this.__wrapped__ = value;
        this.__actions__ = [];
        this.__dir__ = 1;
        this.__filtered__ = false;
        this.__iteratees__ = [];
        this.__takeCount__ = MAX_ARRAY_LENGTH;
        this.__views__ = [];
      }
  
      /**
       * Creates a clone of the lazy wrapper object.
       *
       * @private
       * @name clone
       * @memberOf LazyWrapper
       * @returns {Object} Returns the cloned `LazyWrapper` object.
       */
      function lazyClone() {
        var result = new LazyWrapper(this.__wrapped__);
        result.__actions__ = copyArray(this.__actions__);
        result.__dir__ = this.__dir__;
        result.__filtered__ = this.__filtered__;
        result.__iteratees__ = copyArray(this.__iteratees__);
        result.__takeCount__ = this.__takeCount__;
        result.__views__ = copyArray(this.__views__);
        return result;
      }
  
      /**
       * Reverses the direction of lazy iteration.
       *
       * @private
       * @name reverse
       * @memberOf LazyWrapper
       * @returns {Object} Returns the new reversed `LazyWrapper` object.
       */
      function lazyReverse() {
        if (this.__filtered__) {
          var result = new LazyWrapper(this);
          result.__dir__ = -1;
          result.__filtered__ = true;
        } else {
          result = this.clone();
          result.__dir__ *= -1;
        }
        return result;
      }
  
      /**
       * Extracts the unwrapped value from its lazy wrapper.
       *
       * @private
       * @name value
       * @memberOf LazyWrapper
       * @returns {*} Returns the unwrapped value.
       */
      function lazyValue() {
        var array = this.__wrapped__.value(),
            dir = this.__dir__,
            isArr = isArray(array),
            isRight = dir < 0,
            arrLength = isArr ? array.length : 0,
            view = getView(0, arrLength, this.__views__),
            start = view.start,
            end = view.end,
            length = end - start,
            index = isRight ? end : (start - 1),
            iteratees = this.__iteratees__,
            iterLength = iteratees.length,
            resIndex = 0,
            takeCount = nativeMin(length, this.__takeCount__);
  
        if (!isArr || (!isRight && arrLength == length && takeCount == length)) {
          return baseWrapperValue(array, this.__actions__);
        }
        var result = [];
  
        outer:
        while (length-- && resIndex < takeCount) {
          index += dir;
  
          var iterIndex = -1,
              value = array[index];
  
          while (++iterIndex < iterLength) {
            var data = iteratees[iterIndex],
                iteratee = data.iteratee,
                type = data.type,
                computed = iteratee(value);
  
            if (type == LAZY_MAP_FLAG) {
              value = computed;
            } else if (!computed) {
              if (type == LAZY_FILTER_FLAG) {
                continue outer;
              } else {
                break outer;
              }
            }
          }
          result[resIndex++] = value;
        }
        return result;
      }
  
      // Ensure `LazyWrapper` is an instance of `baseLodash`.
      LazyWrapper.prototype = baseCreate(baseLodash.prototype);
      LazyWrapper.prototype.constructor = LazyWrapper;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates a hash object.
       *
       * @private
       * @constructor
       * @param {Array} [entries] The key-value pairs to cache.
       */
      function Hash(entries) {
        var index = -1,
            length = entries == null ? 0 : entries.length;
  
        this.clear();
        while (++index < length) {
          var entry = entries[index];
          this.set(entry[0], entry[1]);
        }
      }
  
      /**
       * Removes all key-value entries from the hash.
       *
       * @private
       * @name clear
       * @memberOf Hash
       */
      function hashClear() {
        this.__data__ = nativeCreate ? nativeCreate(null) : {};
        this.size = 0;
      }
  
      /**
       * Removes `key` and its value from the hash.
       *
       * @private
       * @name delete
       * @memberOf Hash
       * @param {Object} hash The hash to modify.
       * @param {string} key The key of the value to remove.
       * @returns {boolean} Returns `true` if the entry was removed, else `false`.
       */
      function hashDelete(key) {
        var result = this.has(key) && delete this.__data__[key];
        this.size -= result ? 1 : 0;
        return result;
      }
  
      /**
       * Gets the hash value for `key`.
       *
       * @private
       * @name get
       * @memberOf Hash
       * @param {string} key The key of the value to get.
       * @returns {*} Returns the entry value.
       */
      function hashGet(key) {
        var data = this.__data__;
        if (nativeCreate) {
          var result = data[key];
          return result === HASH_UNDEFINED ? undefined : result;
        }
        return hasOwnProperty.call(data, key) ? data[key] : undefined;
      }
  
      /**
       * Checks if a hash value for `key` exists.
       *
       * @private
       * @name has
       * @memberOf Hash
       * @param {string} key The key of the entry to check.
       * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
       */
      function hashHas(key) {
        var data = this.__data__;
        return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);
      }
  
      /**
       * Sets the hash `key` to `value`.
       *
       * @private
       * @name set
       * @memberOf Hash
       * @param {string} key The key of the value to set.
       * @param {*} value The value to set.
       * @returns {Object} Returns the hash instance.
       */
      function hashSet(key, value) {
        var data = this.__data__;
        this.size += this.has(key) ? 0 : 1;
        data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
        return this;
      }
  
      // Add methods to `Hash`.
      Hash.prototype.clear = hashClear;
      Hash.prototype['delete'] = hashDelete;
      Hash.prototype.get = hashGet;
      Hash.prototype.has = hashHas;
      Hash.prototype.set = hashSet;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates an list cache object.
       *
       * @private
       * @constructor
       * @param {Array} [entries] The key-value pairs to cache.
       */
      function ListCache(entries) {
        var index = -1,
            length = entries == null ? 0 : entries.length;
  
        this.clear();
        while (++index < length) {
          var entry = entries[index];
          this.set(entry[0], entry[1]);
        }
      }
  
      /**
       * Removes all key-value entries from the list cache.
       *
       * @private
       * @name clear
       * @memberOf ListCache
       */
      function listCacheClear() {
        this.__data__ = [];
        this.size = 0;
      }
  
      /**
       * Removes `key` and its value from the list cache.
       *
       * @private
       * @name delete
       * @memberOf ListCache
       * @param {string} key The key of the value to remove.
       * @returns {boolean} Returns `true` if the entry was removed, else `false`.
       */
      function listCacheDelete(key) {
        var data = this.__data__,
            index = assocIndexOf(data, key);
  
        if (index < 0) {
          return false;
        }
        var lastIndex = data.length - 1;
        if (index == lastIndex) {
          data.pop();
        } else {
          splice.call(data, index, 1);
        }
        --this.size;
        return true;
      }
  
      /**
       * Gets the list cache value for `key`.
       *
       * @private
       * @name get
       * @memberOf ListCache
       * @param {string} key The key of the value to get.
       * @returns {*} Returns the entry value.
       */
      function listCacheGet(key) {
        var data = this.__data__,
            index = assocIndexOf(data, key);
  
        return index < 0 ? undefined : data[index][1];
      }
  
      /**
       * Checks if a list cache value for `key` exists.
       *
       * @private
       * @name has
       * @memberOf ListCache
       * @param {string} key The key of the entry to check.
       * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
       */
      function listCacheHas(key) {
        return assocIndexOf(this.__data__, key) > -1;
      }
  
      /**
       * Sets the list cache `key` to `value`.
       *
       * @private
       * @name set
       * @memberOf ListCache
       * @param {string} key The key of the value to set.
       * @param {*} value The value to set.
       * @returns {Object} Returns the list cache instance.
       */
      function listCacheSet(key, value) {
        var data = this.__data__,
            index = assocIndexOf(data, key);
  
        if (index < 0) {
          ++this.size;
          data.push([key, value]);
        } else {
          data[index][1] = value;
        }
        return this;
      }
  
      // Add methods to `ListCache`.
      ListCache.prototype.clear = listCacheClear;
      ListCache.prototype['delete'] = listCacheDelete;
      ListCache.prototype.get = listCacheGet;
      ListCache.prototype.has = listCacheHas;
      ListCache.prototype.set = listCacheSet;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates a map cache object to store key-value pairs.
       *
       * @private
       * @constructor
       * @param {Array} [entries] The key-value pairs to cache.
       */
      function MapCache(entries) {
        var index = -1,
            length = entries == null ? 0 : entries.length;
  
        this.clear();
        while (++index < length) {
          var entry = entries[index];
          this.set(entry[0], entry[1]);
        }
      }
  
      /**
       * Removes all key-value entries from the map.
       *
       * @private
       * @name clear
       * @memberOf MapCache
       */
      function mapCacheClear() {
        this.size = 0;
        this.__data__ = {
          'hash': new Hash,
          'map': new (Map || ListCache),
          'string': new Hash
        };
      }
  
      /**
       * Removes `key` and its value from the map.
       *
       * @private
       * @name delete
       * @memberOf MapCache
       * @param {string} key The key of the value to remove.
       * @returns {boolean} Returns `true` if the entry was removed, else `false`.
       */
      function mapCacheDelete(key) {
        var result = getMapData(this, key)['delete'](key);
        this.size -= result ? 1 : 0;
        return result;
      }
  
      /**
       * Gets the map value for `key`.
       *
       * @private
       * @name get
       * @memberOf MapCache
       * @param {string} key The key of the value to get.
       * @returns {*} Returns the entry value.
       */
      function mapCacheGet(key) {
        return getMapData(this, key).get(key);
      }
  
      /**
       * Checks if a map value for `key` exists.
       *
       * @private
       * @name has
       * @memberOf MapCache
       * @param {string} key The key of the entry to check.
       * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
       */
      function mapCacheHas(key) {
        return getMapData(this, key).has(key);
      }
  
      /**
       * Sets the map `key` to `value`.
       *
       * @private
       * @name set
       * @memberOf MapCache
       * @param {string} key The key of the value to set.
       * @param {*} value The value to set.
       * @returns {Object} Returns the map cache instance.
       */
      function mapCacheSet(key, value) {
        var data = getMapData(this, key),
            size = data.size;
  
        data.set(key, value);
        this.size += data.size == size ? 0 : 1;
        return this;
      }
  
      // Add methods to `MapCache`.
      MapCache.prototype.clear = mapCacheClear;
      MapCache.prototype['delete'] = mapCacheDelete;
      MapCache.prototype.get = mapCacheGet;
      MapCache.prototype.has = mapCacheHas;
      MapCache.prototype.set = mapCacheSet;
  
      /*------------------------------------------------------------------------*/
  
      /**
       *
       * Creates an array cache object to store unique values.
       *
       * @private
       * @constructor
       * @param {Array} [values] The values to cache.
       */
      function SetCache(values) {
        var index = -1,
            length = values == null ? 0 : values.length;
  
        this.__data__ = new MapCache;
        while (++index < length) {
          this.add(values[index]);
        }
      }
  
      /**
       * Adds `value` to the array cache.
       *
       * @private
       * @name add
       * @memberOf SetCache
       * @alias push
       * @param {*} value The value to cache.
       * @returns {Object} Returns the cache instance.
       */
      function setCacheAdd(value) {
        this.__data__.set(value, HASH_UNDEFINED);
        return this;
      }
  
      /**
       * Checks if `value` is in the array cache.
       *
       * @private
       * @name has
       * @memberOf SetCache
       * @param {*} value The value to search for.
       * @returns {number} Returns `true` if `value` is found, else `false`.
       */
      function setCacheHas(value) {
        return this.__data__.has(value);
      }
  
      // Add methods to `SetCache`.
      SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
      SetCache.prototype.has = setCacheHas;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates a stack cache object to store key-value pairs.
       *
       * @private
       * @constructor
       * @param {Array} [entries] The key-value pairs to cache.
       */
      function Stack(entries) {
        var data = this.__data__ = new ListCache(entries);
        this.size = data.size;
      }
  
      /**
       * Removes all key-value entries from the stack.
       *
       * @private
       * @name clear
       * @memberOf Stack
       */
      function stackClear() {
        this.__data__ = new ListCache;
        this.size = 0;
      }
  
      /**
       * Removes `key` and its value from the stack.
       *
       * @private
       * @name delete
       * @memberOf Stack
       * @param {string} key The key of the value to remove.
       * @returns {boolean} Returns `true` if the entry was removed, else `false`.
       */
      function stackDelete(key) {
        var data = this.__data__,
            result = data['delete'](key);
  
        this.size = data.size;
        return result;
      }
  
      /**
       * Gets the stack value for `key`.
       *
       * @private
       * @name get
       * @memberOf Stack
       * @param {string} key The key of the value to get.
       * @returns {*} Returns the entry value.
       */
      function stackGet(key) {
        return this.__data__.get(key);
      }
  
      /**
       * Checks if a stack value for `key` exists.
       *
       * @private
       * @name has
       * @memberOf Stack
       * @param {string} key The key of the entry to check.
       * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
       */
      function stackHas(key) {
        return this.__data__.has(key);
      }
  
      /**
       * Sets the stack `key` to `value`.
       *
       * @private
       * @name set
       * @memberOf Stack
       * @param {string} key The key of the value to set.
       * @param {*} value The value to set.
       * @returns {Object} Returns the stack cache instance.
       */
      function stackSet(key, value) {
        var data = this.__data__;
        if (data instanceof ListCache) {
          var pairs = data.__data__;
          if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
            pairs.push([key, value]);
            this.size = ++data.size;
            return this;
          }
          data = this.__data__ = new MapCache(pairs);
        }
        data.set(key, value);
        this.size = data.size;
        return this;
      }
  
      // Add methods to `Stack`.
      Stack.prototype.clear = stackClear;
      Stack.prototype['delete'] = stackDelete;
      Stack.prototype.get = stackGet;
      Stack.prototype.has = stackHas;
      Stack.prototype.set = stackSet;
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates an array of the enumerable property names of the array-like `value`.
       *
       * @private
       * @param {*} value The value to query.
       * @param {boolean} inherited Specify returning inherited property names.
       * @returns {Array} Returns the array of property names.
       */
      function arrayLikeKeys(value, inherited) {
        var isArr = isArray(value),
            isArg = !isArr && isArguments(value),
            isBuff = !isArr && !isArg && isBuffer(value),
            isType = !isArr && !isArg && !isBuff && isTypedArray(value),
            skipIndexes = isArr || isArg || isBuff || isType,
            result = skipIndexes ? baseTimes(value.length, String) : [],
            length = result.length;
  
        for (var key in value) {
          if ((inherited || hasOwnProperty.call(value, key)) &&
              !(skipIndexes && (
                 // Safari 9 has enumerable `arguments.length` in strict mode.
                 key == 'length' ||
                 // Node.js 0.10 has enumerable non-index properties on buffers.
                 (isBuff && (key == 'offset' || key == 'parent')) ||
                 // PhantomJS 2 has enumerable non-index properties on typed arrays.
                 (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
                 // Skip index properties.
                 isIndex(key, length)
              ))) {
            result.push(key);
          }
        }
        return result;
      }
  
      /**
       * A specialized version of `_.sample` for arrays.
       *
       * @private
       * @param {Array} array The array to sample.
       * @returns {*} Returns the random element.
       */
      function arraySample(array) {
        var length = array.length;
        return length ? array[baseRandom(0, length - 1)] : undefined;
      }
  
      /**
       * A specialized version of `_.sampleSize` for arrays.
       *
       * @private
       * @param {Array} array The array to sample.
       * @param {number} n The number of elements to sample.
       * @returns {Array} Returns the random elements.
       */
      function arraySampleSize(array, n) {
        return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length));
      }
  
      /**
       * A specialized version of `_.shuffle` for arrays.
       *
       * @private
       * @param {Array} array The array to shuffle.
       * @returns {Array} Returns the new shuffled array.
       */
      function arrayShuffle(array) {
        return shuffleSelf(copyArray(array));
      }
  
      /**
       * This function is like `assignValue` except that it doesn't assign
       * `undefined` values.
       *
       * @private
       * @param {Object} object The object to modify.
       * @param {string} key The key of the property to assign.
       * @param {*} value The value to assign.
       */
      function assignMergeValue(object, key, value) {
        if ((value !== undefined && !eq(object[key], value)) ||
            (value === undefined && !(key in object))) {
          baseAssignValue(object, key, value);
        }
      }
  
      /**
       * Assigns `value` to `key` of `object` if the existing value is not equivalent
       * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons.
       *
       * @private
       * @param {Object} object The object to modify.
       * @param {string} key The key of the property to assign.
       * @param {*} value The value to assign.
       */
      function assignValue(object, key, value) {
        var objValue = object[key];
        if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
            (value === undefined && !(key in object))) {
          baseAssignValue(object, key, value);
        }
      }
  
      /**
       * Gets the index at which the `key` is found in `array` of key-value pairs.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {*} key The key to search for.
       * @returns {number} Returns the index of the matched value, else `-1`.
       */
      function assocIndexOf(array, key) {
        var length = array.length;
        while (length--) {
          if (eq(array[length][0], key)) {
            return length;
          }
        }
        return -1;
      }
  
      /**
       * Aggregates elements of `collection` on `accumulator` with keys transformed
       * by `iteratee` and values set by `setter`.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} setter The function to set `accumulator` values.
       * @param {Function} iteratee The iteratee to transform keys.
       * @param {Object} accumulator The initial aggregated object.
       * @returns {Function} Returns `accumulator`.
       */
      function baseAggregator(collection, setter, iteratee, accumulator) {
        baseEach(collection, function(value, key, collection) {
          setter(accumulator, value, iteratee(value), collection);
        });
        return accumulator;
      }
  
      /**
       * The base implementation of `_.assign` without support for multiple sources
       * or `customizer` functions.
       *
       * @private
       * @param {Object} object The destination object.
       * @param {Object} source The source object.
       * @returns {Object} Returns `object`.
       */
      function baseAssign(object, source) {
        return object && copyObject(source, keys(source), object);
      }
  
      /**
       * The base implementation of `_.assignIn` without support for multiple sources
       * or `customizer` functions.
       *
       * @private
       * @param {Object} object The destination object.
       * @param {Object} source The source object.
       * @returns {Object} Returns `object`.
       */
      function baseAssignIn(object, source) {
        return object && copyObject(source, keysIn(source), object);
      }
  
      /**
       * The base implementation of `assignValue` and `assignMergeValue` without
       * value checks.
       *
       * @private
       * @param {Object} object The object to modify.
       * @param {string} key The key of the property to assign.
       * @param {*} value The value to assign.
       */
      function baseAssignValue(object, key, value) {
        if (key == '__proto__' && defineProperty) {
          defineProperty(object, key, {
            'configurable': true,
            'enumerable': true,
            'value': value,
            'writable': true
          });
        } else {
          object[key] = value;
        }
      }
  
      /**
       * The base implementation of `_.at` without support for individual paths.
       *
       * @private
       * @param {Object} object The object to iterate over.
       * @param {string[]} paths The property paths to pick.
       * @returns {Array} Returns the picked elements.
       */
      function baseAt(object, paths) {
        var index = -1,
            length = paths.length,
            result = Array(length),
            skip = object == null;
  
        while (++index < length) {
          result[index] = skip ? undefined : get(object, paths[index]);
        }
        return result;
      }
  
      /**
       * The base implementation of `_.clamp` which doesn't coerce arguments.
       *
       * @private
       * @param {number} number The number to clamp.
       * @param {number} [lower] The lower bound.
       * @param {number} upper The upper bound.
       * @returns {number} Returns the clamped number.
       */
      function baseClamp(number, lower, upper) {
        if (number === number) {
          if (upper !== undefined) {
            number = number <= upper ? number : upper;
          }
          if (lower !== undefined) {
            number = number >= lower ? number : lower;
          }
        }
        return number;
      }
  
      /**
       * The base implementation of `_.clone` and `_.cloneDeep` which tracks
       * traversed objects.
       *
       * @private
       * @param {*} value The value to clone.
       * @param {boolean} bitmask The bitmask flags.
       *  1 - Deep clone
       *  2 - Flatten inherited properties
       *  4 - Clone symbols
       * @param {Function} [customizer] The function to customize cloning.
       * @param {string} [key] The key of `value`.
       * @param {Object} [object] The parent object of `value`.
       * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
       * @returns {*} Returns the cloned value.
       */
      function baseClone(value, bitmask, customizer, key, object, stack) {
        var result,
            isDeep = bitmask & CLONE_DEEP_FLAG,
            isFlat = bitmask & CLONE_FLAT_FLAG,
            isFull = bitmask & CLONE_SYMBOLS_FLAG;
  
        if (customizer) {
          result = object ? customizer(value, key, object, stack) : customizer(value);
        }
        if (result !== undefined) {
          return result;
        }
        if (!isObject(value)) {
          return value;
        }
        var isArr = isArray(value);
        if (isArr) {
          result = initCloneArray(value);
          if (!isDeep) {
            return copyArray(value, result);
          }
        } else {
          var tag = getTag(value),
              isFunc = tag == funcTag || tag == genTag;
  
          if (isBuffer(value)) {
            return cloneBuffer(value, isDeep);
          }
          if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
            result = (isFlat || isFunc) ? {} : initCloneObject(value);
            if (!isDeep) {
              return isFlat
                ? copySymbolsIn(value, baseAssignIn(result, value))
                : copySymbols(value, baseAssign(result, value));
            }
          } else {
            if (!cloneableTags[tag]) {
              return object ? value : {};
            }
            result = initCloneByTag(value, tag, baseClone, isDeep);
          }
        }
        // Check for circular references and return its corresponding clone.
        stack || (stack = new Stack);
        var stacked = stack.get(value);
        if (stacked) {
          return stacked;
        }
        stack.set(value, result);
  
        var keysFunc = isFull
          ? (isFlat ? getAllKeysIn : getAllKeys)
          : (isFlat ? keysIn : keys);
  
        var props = isArr ? undefined : keysFunc(value);
        arrayEach(props || value, function(subValue, key) {
          if (props) {
            key = subValue;
            subValue = value[key];
          }
          // Recursively populate clone (susceptible to call stack limits).
          assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
        });
        return result;
      }
  
      /**
       * The base implementation of `_.conforms` which doesn't clone `source`.
       *
       * @private
       * @param {Object} source The object of property predicates to conform to.
       * @returns {Function} Returns the new spec function.
       */
      function baseConforms(source) {
        var props = keys(source);
        return function(object) {
          return baseConformsTo(object, source, props);
        };
      }
  
      /**
       * The base implementation of `_.conformsTo` which accepts `props` to check.
       *
       * @private
       * @param {Object} object The object to inspect.
       * @param {Object} source The object of property predicates to conform to.
       * @returns {boolean} Returns `true` if `object` conforms, else `false`.
       */
      function baseConformsTo(object, source, props) {
        var length = props.length;
        if (object == null) {
          return !length;
        }
        object = Object(object);
        while (length--) {
          var key = props[length],
              predicate = source[key],
              value = object[key];
  
          if ((value === undefined && !(key in object)) || !predicate(value)) {
            return false;
          }
        }
        return true;
      }
  
      /**
       * The base implementation of `_.delay` and `_.defer` which accepts `args`
       * to provide to `func`.
       *
       * @private
       * @param {Function} func The function to delay.
       * @param {number} wait The number of milliseconds to delay invocation.
       * @param {Array} args The arguments to provide to `func`.
       * @returns {number|Object} Returns the timer id or timeout object.
       */
      function baseDelay(func, wait, args) {
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        return setTimeout(function() { func.apply(undefined, args); }, wait);
      }
  
      /**
       * The base implementation of methods like `_.difference` without support
       * for excluding multiple arrays or iteratee shorthands.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {Array} values The values to exclude.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of filtered values.
       */
      function baseDifference(array, values, iteratee, comparator) {
        var index = -1,
            includes = arrayIncludes,
            isCommon = true,
            length = array.length,
            result = [],
            valuesLength = values.length;
  
        if (!length) {
          return result;
        }
        if (iteratee) {
          values = arrayMap(values, baseUnary(iteratee));
        }
        if (comparator) {
          includes = arrayIncludesWith;
          isCommon = false;
        }
        else if (values.length >= LARGE_ARRAY_SIZE) {
          includes = cacheHas;
          isCommon = false;
          values = new SetCache(values);
        }
        outer:
        while (++index < length) {
          var value = array[index],
              computed = iteratee == null ? value : iteratee(value);
  
          value = (comparator || value !== 0) ? value : 0;
          if (isCommon && computed === computed) {
            var valuesIndex = valuesLength;
            while (valuesIndex--) {
              if (values[valuesIndex] === computed) {
                continue outer;
              }
            }
            result.push(value);
          }
          else if (!includes(values, computed, comparator)) {
            result.push(value);
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.forEach` without support for iteratee shorthands.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Array|Object} Returns `collection`.
       */
      var baseEach = createBaseEach(baseForOwn);
  
      /**
       * The base implementation of `_.forEachRight` without support for iteratee shorthands.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Array|Object} Returns `collection`.
       */
      var baseEachRight = createBaseEach(baseForOwnRight, true);
  
      /**
       * The base implementation of `_.every` without support for iteratee shorthands.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} predicate The function invoked per iteration.
       * @returns {boolean} Returns `true` if all elements pass the predicate check,
       *  else `false`
       */
      function baseEvery(collection, predicate) {
        var result = true;
        baseEach(collection, function(value, index, collection) {
          result = !!predicate(value, index, collection);
          return result;
        });
        return result;
      }
  
      /**
       * The base implementation of methods like `_.max` and `_.min` which accepts a
       * `comparator` to determine the extremum value.
       *
       * @private
       * @param {Array} array The array to iterate over.
       * @param {Function} iteratee The iteratee invoked per iteration.
       * @param {Function} comparator The comparator used to compare values.
       * @returns {*} Returns the extremum value.
       */
      function baseExtremum(array, iteratee, comparator) {
        var index = -1,
            length = array.length;
  
        while (++index < length) {
          var value = array[index],
              current = iteratee(value);
  
          if (current != null && (computed === undefined
                ? (current === current && !isSymbol(current))
                : comparator(current, computed)
              )) {
            var computed = current,
                result = value;
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.fill` without an iteratee call guard.
       *
       * @private
       * @param {Array} array The array to fill.
       * @param {*} value The value to fill `array` with.
       * @param {number} [start=0] The start position.
       * @param {number} [end=array.length] The end position.
       * @returns {Array} Returns `array`.
       */
      function baseFill(array, value, start, end) {
        var length = array.length;
  
        start = toInteger(start);
        if (start < 0) {
          start = -start > length ? 0 : (length + start);
        }
        end = (end === undefined || end > length) ? length : toInteger(end);
        if (end < 0) {
          end += length;
        }
        end = start > end ? 0 : toLength(end);
        while (start < end) {
          array[start++] = value;
        }
        return array;
      }
  
      /**
       * The base implementation of `_.filter` without support for iteratee shorthands.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} predicate The function invoked per iteration.
       * @returns {Array} Returns the new filtered array.
       */
      function baseFilter(collection, predicate) {
        var result = [];
        baseEach(collection, function(value, index, collection) {
          if (predicate(value, index, collection)) {
            result.push(value);
          }
        });
        return result;
      }
  
      /**
       * The base implementation of `_.flatten` with support for restricting flattening.
       *
       * @private
       * @param {Array} array The array to flatten.
       * @param {number} depth The maximum recursion depth.
       * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
       * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
       * @param {Array} [result=[]] The initial result value.
       * @returns {Array} Returns the new flattened array.
       */
      function baseFlatten(array, depth, predicate, isStrict, result) {
        var index = -1,
            length = array.length;
  
        predicate || (predicate = isFlattenable);
        result || (result = []);
  
        while (++index < length) {
          var value = array[index];
          if (depth > 0 && predicate(value)) {
            if (depth > 1) {
              // Recursively flatten arrays (susceptible to call stack limits).
              baseFlatten(value, depth - 1, predicate, isStrict, result);
            } else {
              arrayPush(result, value);
            }
          } else if (!isStrict) {
            result[result.length] = value;
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `baseForOwn` which iterates over `object`
       * properties returned by `keysFunc` and invokes `iteratee` for each property.
       * Iteratee functions may exit iteration early by explicitly returning `false`.
       *
       * @private
       * @param {Object} object The object to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @param {Function} keysFunc The function to get the keys of `object`.
       * @returns {Object} Returns `object`.
       */
      var baseFor = createBaseFor();
  
      /**
       * This function is like `baseFor` except that it iterates over properties
       * in the opposite order.
       *
       * @private
       * @param {Object} object The object to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @param {Function} keysFunc The function to get the keys of `object`.
       * @returns {Object} Returns `object`.
       */
      var baseForRight = createBaseFor(true);
  
      /**
       * The base implementation of `_.forOwn` without support for iteratee shorthands.
       *
       * @private
       * @param {Object} object The object to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Object} Returns `object`.
       */
      function baseForOwn(object, iteratee) {
        return object && baseFor(object, iteratee, keys);
      }
  
      /**
       * The base implementation of `_.forOwnRight` without support for iteratee shorthands.
       *
       * @private
       * @param {Object} object The object to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Object} Returns `object`.
       */
      function baseForOwnRight(object, iteratee) {
        return object && baseForRight(object, iteratee, keys);
      }
  
      /**
       * The base implementation of `_.functions` which creates an array of
       * `object` function property names filtered from `props`.
       *
       * @private
       * @param {Object} object The object to inspect.
       * @param {Array} props The property names to filter.
       * @returns {Array} Returns the function names.
       */
      function baseFunctions(object, props) {
        return arrayFilter(props, function(key) {
          return isFunction(object[key]);
        });
      }
  
      /**
       * The base implementation of `_.get` without support for default values.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {Array|string} path The path of the property to get.
       * @returns {*} Returns the resolved value.
       */
      function baseGet(object, path) {
        path = castPath(path, object);
  
        var index = 0,
            length = path.length;
  
        while (object != null && index < length) {
          object = object[toKey(path[index++])];
        }
        return (index && index == length) ? object : undefined;
      }
  
      /**
       * The base implementation of `getAllKeys` and `getAllKeysIn` which uses
       * `keysFunc` and `symbolsFunc` to get the enumerable property names and
       * symbols of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {Function} keysFunc The function to get the keys of `object`.
       * @param {Function} symbolsFunc The function to get the symbols of `object`.
       * @returns {Array} Returns the array of property names and symbols.
       */
      function baseGetAllKeys(object, keysFunc, symbolsFunc) {
        var result = keysFunc(object);
        return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
      }
  
      /**
       * The base implementation of `getTag` without fallbacks for buggy environments.
       *
       * @private
       * @param {*} value The value to query.
       * @returns {string} Returns the `toStringTag`.
       */
      function baseGetTag(value) {
        if (value == null) {
          return value === undefined ? undefinedTag : nullTag;
        }
        return (symToStringTag && symToStringTag in Object(value))
          ? getRawTag(value)
          : objectToString(value);
      }
  
      /**
       * The base implementation of `_.gt` which doesn't coerce arguments.
       *
       * @private
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if `value` is greater than `other`,
       *  else `false`.
       */
      function baseGt(value, other) {
        return value > other;
      }
  
      /**
       * The base implementation of `_.has` without support for deep paths.
       *
       * @private
       * @param {Object} [object] The object to query.
       * @param {Array|string} key The key to check.
       * @returns {boolean} Returns `true` if `key` exists, else `false`.
       */
      function baseHas(object, key) {
        return object != null && hasOwnProperty.call(object, key);
      }
  
      /**
       * The base implementation of `_.hasIn` without support for deep paths.
       *
       * @private
       * @param {Object} [object] The object to query.
       * @param {Array|string} key The key to check.
       * @returns {boolean} Returns `true` if `key` exists, else `false`.
       */
      function baseHasIn(object, key) {
        return object != null && key in Object(object);
      }
  
      /**
       * The base implementation of `_.inRange` which doesn't coerce arguments.
       *
       * @private
       * @param {number} number The number to check.
       * @param {number} start The start of the range.
       * @param {number} end The end of the range.
       * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
       */
      function baseInRange(number, start, end) {
        return number >= nativeMin(start, end) && number < nativeMax(start, end);
      }
  
      /**
       * The base implementation of methods like `_.intersection`, without support
       * for iteratee shorthands, that accepts an array of arrays to inspect.
       *
       * @private
       * @param {Array} arrays The arrays to inspect.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of shared values.
       */
      function baseIntersection(arrays, iteratee, comparator) {
        var includes = comparator ? arrayIncludesWith : arrayIncludes,
            length = arrays[0].length,
            othLength = arrays.length,
            othIndex = othLength,
            caches = Array(othLength),
            maxLength = Infinity,
            result = [];
  
        while (othIndex--) {
          var array = arrays[othIndex];
          if (othIndex && iteratee) {
            array = arrayMap(array, baseUnary(iteratee));
          }
          maxLength = nativeMin(array.length, maxLength);
          caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))
            ? new SetCache(othIndex && array)
            : undefined;
        }
        array = arrays[0];
  
        var index = -1,
            seen = caches[0];
  
        outer:
        while (++index < length && result.length < maxLength) {
          var value = array[index],
              computed = iteratee ? iteratee(value) : value;
  
          value = (comparator || value !== 0) ? value : 0;
          if (!(seen
                ? cacheHas(seen, computed)
                : includes(result, computed, comparator)
              )) {
            othIndex = othLength;
            while (--othIndex) {
              var cache = caches[othIndex];
              if (!(cache
                    ? cacheHas(cache, computed)
                    : includes(arrays[othIndex], computed, comparator))
                  ) {
                continue outer;
              }
            }
            if (seen) {
              seen.push(computed);
            }
            result.push(value);
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.invert` and `_.invertBy` which inverts
       * `object` with values transformed by `iteratee` and set by `setter`.
       *
       * @private
       * @param {Object} object The object to iterate over.
       * @param {Function} setter The function to set `accumulator` values.
       * @param {Function} iteratee The iteratee to transform values.
       * @param {Object} accumulator The initial inverted object.
       * @returns {Function} Returns `accumulator`.
       */
      function baseInverter(object, setter, iteratee, accumulator) {
        baseForOwn(object, function(value, key, object) {
          setter(accumulator, iteratee(value), key, object);
        });
        return accumulator;
      }
  
      /**
       * The base implementation of `_.invoke` without support for individual
       * method arguments.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {Array|string} path The path of the method to invoke.
       * @param {Array} args The arguments to invoke the method with.
       * @returns {*} Returns the result of the invoked method.
       */
      function baseInvoke(object, path, args) {
        path = castPath(path, object);
        object = parent(object, path);
        var func = object == null ? object : object[toKey(last(path))];
        return func == null ? undefined : apply(func, object, args);
      }
  
      /**
       * The base implementation of `_.isArguments`.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an `arguments` object,
       */
      function baseIsArguments(value) {
        return isObjectLike(value) && baseGetTag(value) == argsTag;
      }
  
      /**
       * The base implementation of `_.isArrayBuffer` without Node.js optimizations.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
       */
      function baseIsArrayBuffer(value) {
        return isObjectLike(value) && baseGetTag(value) == arrayBufferTag;
      }
  
      /**
       * The base implementation of `_.isDate` without Node.js optimizations.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
       */
      function baseIsDate(value) {
        return isObjectLike(value) && baseGetTag(value) == dateTag;
      }
  
      /**
       * The base implementation of `_.isEqual` which supports partial comparisons
       * and tracks traversed objects.
       *
       * @private
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @param {boolean} bitmask The bitmask flags.
       *  1 - Unordered comparison
       *  2 - Partial comparison
       * @param {Function} [customizer] The function to customize comparisons.
       * @param {Object} [stack] Tracks traversed `value` and `other` objects.
       * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
       */
      function baseIsEqual(value, other, bitmask, customizer, stack) {
        if (value === other) {
          return true;
        }
        if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
          return value !== value && other !== other;
        }
        return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);
      }
  
      /**
       * A specialized version of `baseIsEqual` for arrays and objects which performs
       * deep comparisons and tracks traversed objects enabling objects with circular
       * references to be compared.
       *
       * @private
       * @param {Object} object The object to compare.
       * @param {Object} other The other object to compare.
       * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
       * @param {Function} customizer The function to customize comparisons.
       * @param {Function} equalFunc The function to determine equivalents of values.
       * @param {Object} [stack] Tracks traversed `object` and `other` objects.
       * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
       */
      function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {
        var objIsArr = isArray(object),
            othIsArr = isArray(other),
            objTag = objIsArr ? arrayTag : getTag(object),
            othTag = othIsArr ? arrayTag : getTag(other);
  
        objTag = objTag == argsTag ? objectTag : objTag;
        othTag = othTag == argsTag ? objectTag : othTag;
  
        var objIsObj = objTag == objectTag,
            othIsObj = othTag == objectTag,
            isSameTag = objTag == othTag;
  
        if (isSameTag && isBuffer(object)) {
          if (!isBuffer(other)) {
            return false;
          }
          objIsArr = true;
          objIsObj = false;
        }
        if (isSameTag && !objIsObj) {
          stack || (stack = new Stack);
          return (objIsArr || isTypedArray(object))
            ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)
            : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);
        }
        if (!(bitmask & COMPARE_PARTIAL_FLAG)) {
          var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
              othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');
  
          if (objIsWrapped || othIsWrapped) {
            var objUnwrapped = objIsWrapped ? object.value() : object,
                othUnwrapped = othIsWrapped ? other.value() : other;
  
            stack || (stack = new Stack);
            return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);
          }
        }
        if (!isSameTag) {
          return false;
        }
        stack || (stack = new Stack);
        return equalObjects(object, other, bitmask, customizer, equalFunc, stack);
      }
  
      /**
       * The base implementation of `_.isMap` without Node.js optimizations.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a map, else `false`.
       */
      function baseIsMap(value) {
        return isObjectLike(value) && getTag(value) == mapTag;
      }
  
      /**
       * The base implementation of `_.isMatch` without support for iteratee shorthands.
       *
       * @private
       * @param {Object} object The object to inspect.
       * @param {Object} source The object of property values to match.
       * @param {Array} matchData The property names, values, and compare flags to match.
       * @param {Function} [customizer] The function to customize comparisons.
       * @returns {boolean} Returns `true` if `object` is a match, else `false`.
       */
      function baseIsMatch(object, source, matchData, customizer) {
        var index = matchData.length,
            length = index,
            noCustomizer = !customizer;
  
        if (object == null) {
          return !length;
        }
        object = Object(object);
        while (index--) {
          var data = matchData[index];
          if ((noCustomizer && data[2])
                ? data[1] !== object[data[0]]
                : !(data[0] in object)
              ) {
            return false;
          }
        }
        while (++index < length) {
          data = matchData[index];
          var key = data[0],
              objValue = object[key],
              srcValue = data[1];
  
          if (noCustomizer && data[2]) {
            if (objValue === undefined && !(key in object)) {
              return false;
            }
          } else {
            var stack = new Stack;
            if (customizer) {
              var result = customizer(objValue, srcValue, key, object, source, stack);
            }
            if (!(result === undefined
                  ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack)
                  : result
                )) {
              return false;
            }
          }
        }
        return true;
      }
  
      /**
       * The base implementation of `_.isNative` without bad shim checks.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a native function,
       *  else `false`.
       */
      function baseIsNative(value) {
        if (!isObject(value) || isMasked(value)) {
          return false;
        }
        var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
        return pattern.test(toSource(value));
      }
  
      /**
       * The base implementation of `_.isRegExp` without Node.js optimizations.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
       */
      function baseIsRegExp(value) {
        return isObjectLike(value) && baseGetTag(value) == regexpTag;
      }
  
      /**
       * The base implementation of `_.isSet` without Node.js optimizations.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a set, else `false`.
       */
      function baseIsSet(value) {
        return isObjectLike(value) && getTag(value) == setTag;
      }
  
      /**
       * The base implementation of `_.isTypedArray` without Node.js optimizations.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
       */
      function baseIsTypedArray(value) {
        return isObjectLike(value) &&
          isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
      }
  
      /**
       * The base implementation of `_.iteratee`.
       *
       * @private
       * @param {*} [value=_.identity] The value to convert to an iteratee.
       * @returns {Function} Returns the iteratee.
       */
      function baseIteratee(value) {
        // Don't store the `typeof` result in a variable to avoid a JIT bug in Safari 9.
        // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details.
        if (typeof value == 'function') {
          return value;
        }
        if (value == null) {
          return identity;
        }
        if (typeof value == 'object') {
          return isArray(value)
            ? baseMatchesProperty(value[0], value[1])
            : baseMatches(value);
        }
        return property(value);
      }
  
      /**
       * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names.
       */
      function baseKeys(object) {
        if (!isPrototype(object)) {
          return nativeKeys(object);
        }
        var result = [];
        for (var key in Object(object)) {
          if (hasOwnProperty.call(object, key) && key != 'constructor') {
            result.push(key);
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names.
       */
      function baseKeysIn(object) {
        if (!isObject(object)) {
          return nativeKeysIn(object);
        }
        var isProto = isPrototype(object),
            result = [];
  
        for (var key in object) {
          if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
            result.push(key);
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.lt` which doesn't coerce arguments.
       *
       * @private
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if `value` is less than `other`,
       *  else `false`.
       */
      function baseLt(value, other) {
        return value < other;
      }
  
      /**
       * The base implementation of `_.map` without support for iteratee shorthands.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Array} Returns the new mapped array.
       */
      function baseMap(collection, iteratee) {
        var index = -1,
            result = isArrayLike(collection) ? Array(collection.length) : [];
  
        baseEach(collection, function(value, key, collection) {
          result[++index] = iteratee(value, key, collection);
        });
        return result;
      }
  
      /**
       * The base implementation of `_.matches` which doesn't clone `source`.
       *
       * @private
       * @param {Object} source The object of property values to match.
       * @returns {Function} Returns the new spec function.
       */
      function baseMatches(source) {
        var matchData = getMatchData(source);
        if (matchData.length == 1 && matchData[0][2]) {
          return matchesStrictComparable(matchData[0][0], matchData[0][1]);
        }
        return function(object) {
          return object === source || baseIsMatch(object, source, matchData);
        };
      }
  
      /**
       * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`.
       *
       * @private
       * @param {string} path The path of the property to get.
       * @param {*} srcValue The value to match.
       * @returns {Function} Returns the new spec function.
       */
      function baseMatchesProperty(path, srcValue) {
        if (isKey(path) && isStrictComparable(srcValue)) {
          return matchesStrictComparable(toKey(path), srcValue);
        }
        return function(object) {
          var objValue = get(object, path);
          return (objValue === undefined && objValue === srcValue)
            ? hasIn(object, path)
            : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG);
        };
      }
  
      /**
       * The base implementation of `_.merge` without support for multiple sources.
       *
       * @private
       * @param {Object} object The destination object.
       * @param {Object} source The source object.
       * @param {number} srcIndex The index of `source`.
       * @param {Function} [customizer] The function to customize merged values.
       * @param {Object} [stack] Tracks traversed source values and their merged
       *  counterparts.
       */
      function baseMerge(object, source, srcIndex, customizer, stack) {
        if (object === source) {
          return;
        }
        baseFor(source, function(srcValue, key) {
          if (isObject(srcValue)) {
            stack || (stack = new Stack);
            baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
          }
          else {
            var newValue = customizer
              ? customizer(object[key], srcValue, (key + ''), object, source, stack)
              : undefined;
  
            if (newValue === undefined) {
              newValue = srcValue;
            }
            assignMergeValue(object, key, newValue);
          }
        }, keysIn);
      }
  
      /**
       * A specialized version of `baseMerge` for arrays and objects which performs
       * deep merges and tracks traversed objects enabling objects with circular
       * references to be merged.
       *
       * @private
       * @param {Object} object The destination object.
       * @param {Object} source The source object.
       * @param {string} key The key of the value to merge.
       * @param {number} srcIndex The index of `source`.
       * @param {Function} mergeFunc The function to merge values.
       * @param {Function} [customizer] The function to customize assigned values.
       * @param {Object} [stack] Tracks traversed source values and their merged
       *  counterparts.
       */
      function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
        var objValue = object[key],
            srcValue = source[key],
            stacked = stack.get(srcValue);
  
        if (stacked) {
          assignMergeValue(object, key, stacked);
          return;
        }
        var newValue = customizer
          ? customizer(objValue, srcValue, (key + ''), object, source, stack)
          : undefined;
  
        var isCommon = newValue === undefined;
  
        if (isCommon) {
          var isArr = isArray(srcValue),
              isBuff = !isArr && isBuffer(srcValue),
              isTyped = !isArr && !isBuff && isTypedArray(srcValue);
  
          newValue = srcValue;
          if (isArr || isBuff || isTyped) {
            if (isArray(objValue)) {
              newValue = objValue;
            }
            else if (isArrayLikeObject(objValue)) {
              newValue = copyArray(objValue);
            }
            else if (isBuff) {
              isCommon = false;
              newValue = cloneBuffer(srcValue, true);
            }
            else if (isTyped) {
              isCommon = false;
              newValue = cloneTypedArray(srcValue, true);
            }
            else {
              newValue = [];
            }
          }
          else if (isPlainObject(srcValue) || isArguments(srcValue)) {
            newValue = objValue;
            if (isArguments(objValue)) {
              newValue = toPlainObject(objValue);
            }
            else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) {
              newValue = initCloneObject(srcValue);
            }
          }
          else {
            isCommon = false;
          }
        }
        if (isCommon) {
          // Recursively merge objects and arrays (susceptible to call stack limits).
          stack.set(srcValue, newValue);
          mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
          stack['delete'](srcValue);
        }
        assignMergeValue(object, key, newValue);
      }
  
      /**
       * The base implementation of `_.nth` which doesn't coerce arguments.
       *
       * @private
       * @param {Array} array The array to query.
       * @param {number} n The index of the element to return.
       * @returns {*} Returns the nth element of `array`.
       */
      function baseNth(array, n) {
        var length = array.length;
        if (!length) {
          return;
        }
        n += n < 0 ? length : 0;
        return isIndex(n, length) ? array[n] : undefined;
      }
  
      /**
       * The base implementation of `_.orderBy` without param guards.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
       * @param {string[]} orders The sort orders of `iteratees`.
       * @returns {Array} Returns the new sorted array.
       */
      function baseOrderBy(collection, iteratees, orders) {
        var index = -1;
        iteratees = arrayMap(iteratees.length ? iteratees : [identity], baseUnary(getIteratee()));
  
        var result = baseMap(collection, function(value, key, collection) {
          var criteria = arrayMap(iteratees, function(iteratee) {
            return iteratee(value);
          });
          return { 'criteria': criteria, 'index': ++index, 'value': value };
        });
  
        return baseSortBy(result, function(object, other) {
          return compareMultiple(object, other, orders);
        });
      }
  
      /**
       * The base implementation of `_.pick` without support for individual
       * property identifiers.
       *
       * @private
       * @param {Object} object The source object.
       * @param {string[]} paths The property paths to pick.
       * @returns {Object} Returns the new object.
       */
      function basePick(object, paths) {
        return basePickBy(object, paths, function(value, path) {
          return hasIn(object, path);
        });
      }
  
      /**
       * The base implementation of  `_.pickBy` without support for iteratee shorthands.
       *
       * @private
       * @param {Object} object The source object.
       * @param {string[]} paths The property paths to pick.
       * @param {Function} predicate The function invoked per property.
       * @returns {Object} Returns the new object.
       */
      function basePickBy(object, paths, predicate) {
        var index = -1,
            length = paths.length,
            result = {};
  
        while (++index < length) {
          var path = paths[index],
              value = baseGet(object, path);
  
          if (predicate(value, path)) {
            baseSet(result, castPath(path, object), value);
          }
        }
        return result;
      }
  
      /**
       * A specialized version of `baseProperty` which supports deep paths.
       *
       * @private
       * @param {Array|string} path The path of the property to get.
       * @returns {Function} Returns the new accessor function.
       */
      function basePropertyDeep(path) {
        return function(object) {
          return baseGet(object, path);
        };
      }
  
      /**
       * The base implementation of `_.pullAllBy` without support for iteratee
       * shorthands.
       *
       * @private
       * @param {Array} array The array to modify.
       * @param {Array} values The values to remove.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns `array`.
       */
      function basePullAll(array, values, iteratee, comparator) {
        var indexOf = comparator ? baseIndexOfWith : baseIndexOf,
            index = -1,
            length = values.length,
            seen = array;
  
        if (array === values) {
          values = copyArray(values);
        }
        if (iteratee) {
          seen = arrayMap(array, baseUnary(iteratee));
        }
        while (++index < length) {
          var fromIndex = 0,
              value = values[index],
              computed = iteratee ? iteratee(value) : value;
  
          while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {
            if (seen !== array) {
              splice.call(seen, fromIndex, 1);
            }
            splice.call(array, fromIndex, 1);
          }
        }
        return array;
      }
  
      /**
       * The base implementation of `_.pullAt` without support for individual
       * indexes or capturing the removed elements.
       *
       * @private
       * @param {Array} array The array to modify.
       * @param {number[]} indexes The indexes of elements to remove.
       * @returns {Array} Returns `array`.
       */
      function basePullAt(array, indexes) {
        var length = array ? indexes.length : 0,
            lastIndex = length - 1;
  
        while (length--) {
          var index = indexes[length];
          if (length == lastIndex || index !== previous) {
            var previous = index;
            if (isIndex(index)) {
              splice.call(array, index, 1);
            } else {
              baseUnset(array, index);
            }
          }
        }
        return array;
      }
  
      /**
       * The base implementation of `_.random` without support for returning
       * floating-point numbers.
       *
       * @private
       * @param {number} lower The lower bound.
       * @param {number} upper The upper bound.
       * @returns {number} Returns the random number.
       */
      function baseRandom(lower, upper) {
        return lower + nativeFloor(nativeRandom() * (upper - lower + 1));
      }
  
      /**
       * The base implementation of `_.range` and `_.rangeRight` which doesn't
       * coerce arguments.
       *
       * @private
       * @param {number} start The start of the range.
       * @param {number} end The end of the range.
       * @param {number} step The value to increment or decrement by.
       * @param {boolean} [fromRight] Specify iterating from right to left.
       * @returns {Array} Returns the range of numbers.
       */
      function baseRange(start, end, step, fromRight) {
        var index = -1,
            length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
            result = Array(length);
  
        while (length--) {
          result[fromRight ? length : ++index] = start;
          start += step;
        }
        return result;
      }
  
      /**
       * The base implementation of `_.repeat` which doesn't coerce arguments.
       *
       * @private
       * @param {string} string The string to repeat.
       * @param {number} n The number of times to repeat the string.
       * @returns {string} Returns the repeated string.
       */
      function baseRepeat(string, n) {
        var result = '';
        if (!string || n < 1 || n > MAX_SAFE_INTEGER) {
          return result;
        }
        // Leverage the exponentiation by squaring algorithm for a faster repeat.
        // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
        do {
          if (n % 2) {
            result += string;
          }
          n = nativeFloor(n / 2);
          if (n) {
            string += string;
          }
        } while (n);
  
        return result;
      }
  
      /**
       * The base implementation of `_.rest` which doesn't validate or coerce arguments.
       *
       * @private
       * @param {Function} func The function to apply a rest parameter to.
       * @param {number} [start=func.length-1] The start position of the rest parameter.
       * @returns {Function} Returns the new function.
       */
      function baseRest(func, start) {
        return setToString(overRest(func, start, identity), func + '');
      }
  
      /**
       * The base implementation of `_.sample`.
       *
       * @private
       * @param {Array|Object} collection The collection to sample.
       * @returns {*} Returns the random element.
       */
      function baseSample(collection) {
        return arraySample(values(collection));
      }
  
      /**
       * The base implementation of `_.sampleSize` without param guards.
       *
       * @private
       * @param {Array|Object} collection The collection to sample.
       * @param {number} n The number of elements to sample.
       * @returns {Array} Returns the random elements.
       */
      function baseSampleSize(collection, n) {
        var array = values(collection);
        return shuffleSelf(array, baseClamp(n, 0, array.length));
      }
  
      /**
       * The base implementation of `_.set`.
       *
       * @private
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to set.
       * @param {*} value The value to set.
       * @param {Function} [customizer] The function to customize path creation.
       * @returns {Object} Returns `object`.
       */
      function baseSet(object, path, value, customizer) {
        if (!isObject(object)) {
          return object;
        }
        path = castPath(path, object);
  
        var index = -1,
            length = path.length,
            lastIndex = length - 1,
            nested = object;
  
        while (nested != null && ++index < length) {
          var key = toKey(path[index]),
              newValue = value;
  
          if (index != lastIndex) {
            var objValue = nested[key];
            newValue = customizer ? customizer(objValue, key, nested) : undefined;
            if (newValue === undefined) {
              newValue = isObject(objValue)
                ? objValue
                : (isIndex(path[index + 1]) ? [] : {});
            }
          }
          assignValue(nested, key, newValue);
          nested = nested[key];
        }
        return object;
      }
  
      /**
       * The base implementation of `setData` without support for hot loop shorting.
       *
       * @private
       * @param {Function} func The function to associate metadata with.
       * @param {*} data The metadata.
       * @returns {Function} Returns `func`.
       */
      var baseSetData = !metaMap ? identity : function(func, data) {
        metaMap.set(func, data);
        return func;
      };
  
      /**
       * The base implementation of `setToString` without support for hot loop shorting.
       *
       * @private
       * @param {Function} func The function to modify.
       * @param {Function} string The `toString` result.
       * @returns {Function} Returns `func`.
       */
      var baseSetToString = !defineProperty ? identity : function(func, string) {
        return defineProperty(func, 'toString', {
          'configurable': true,
          'enumerable': false,
          'value': constant(string),
          'writable': true
        });
      };
  
      /**
       * The base implementation of `_.shuffle`.
       *
       * @private
       * @param {Array|Object} collection The collection to shuffle.
       * @returns {Array} Returns the new shuffled array.
       */
      function baseShuffle(collection) {
        return shuffleSelf(values(collection));
      }
  
      /**
       * The base implementation of `_.slice` without an iteratee call guard.
       *
       * @private
       * @param {Array} array The array to slice.
       * @param {number} [start=0] The start position.
       * @param {number} [end=array.length] The end position.
       * @returns {Array} Returns the slice of `array`.
       */
      function baseSlice(array, start, end) {
        var index = -1,
            length = array.length;
  
        if (start < 0) {
          start = -start > length ? 0 : (length + start);
        }
        end = end > length ? length : end;
        if (end < 0) {
          end += length;
        }
        length = start > end ? 0 : ((end - start) >>> 0);
        start >>>= 0;
  
        var result = Array(length);
        while (++index < length) {
          result[index] = array[index + start];
        }
        return result;
      }
  
      /**
       * The base implementation of `_.some` without support for iteratee shorthands.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} predicate The function invoked per iteration.
       * @returns {boolean} Returns `true` if any element passes the predicate check,
       *  else `false`.
       */
      function baseSome(collection, predicate) {
        var result;
  
        baseEach(collection, function(value, index, collection) {
          result = predicate(value, index, collection);
          return !result;
        });
        return !!result;
      }
  
      /**
       * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which
       * performs a binary search of `array` to determine the index at which `value`
       * should be inserted into `array` in order to maintain its sort order.
       *
       * @private
       * @param {Array} array The sorted array to inspect.
       * @param {*} value The value to evaluate.
       * @param {boolean} [retHighest] Specify returning the highest qualified index.
       * @returns {number} Returns the index at which `value` should be inserted
       *  into `array`.
       */
      function baseSortedIndex(array, value, retHighest) {
        var low = 0,
            high = array == null ? low : array.length;
  
        if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
          while (low < high) {
            var mid = (low + high) >>> 1,
                computed = array[mid];
  
            if (computed !== null && !isSymbol(computed) &&
                (retHighest ? (computed <= value) : (computed < value))) {
              low = mid + 1;
            } else {
              high = mid;
            }
          }
          return high;
        }
        return baseSortedIndexBy(array, value, identity, retHighest);
      }
  
      /**
       * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy`
       * which invokes `iteratee` for `value` and each element of `array` to compute
       * their sort ranking. The iteratee is invoked with one argument; (value).
       *
       * @private
       * @param {Array} array The sorted array to inspect.
       * @param {*} value The value to evaluate.
       * @param {Function} iteratee The iteratee invoked per element.
       * @param {boolean} [retHighest] Specify returning the highest qualified index.
       * @returns {number} Returns the index at which `value` should be inserted
       *  into `array`.
       */
      function baseSortedIndexBy(array, value, iteratee, retHighest) {
        value = iteratee(value);
  
        var low = 0,
            high = array == null ? 0 : array.length,
            valIsNaN = value !== value,
            valIsNull = value === null,
            valIsSymbol = isSymbol(value),
            valIsUndefined = value === undefined;
  
        while (low < high) {
          var mid = nativeFloor((low + high) / 2),
              computed = iteratee(array[mid]),
              othIsDefined = computed !== undefined,
              othIsNull = computed === null,
              othIsReflexive = computed === computed,
              othIsSymbol = isSymbol(computed);
  
          if (valIsNaN) {
            var setLow = retHighest || othIsReflexive;
          } else if (valIsUndefined) {
            setLow = othIsReflexive && (retHighest || othIsDefined);
          } else if (valIsNull) {
            setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);
          } else if (valIsSymbol) {
            setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);
          } else if (othIsNull || othIsSymbol) {
            setLow = false;
          } else {
            setLow = retHighest ? (computed <= value) : (computed < value);
          }
          if (setLow) {
            low = mid + 1;
          } else {
            high = mid;
          }
        }
        return nativeMin(high, MAX_ARRAY_INDEX);
      }
  
      /**
       * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without
       * support for iteratee shorthands.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @returns {Array} Returns the new duplicate free array.
       */
      function baseSortedUniq(array, iteratee) {
        var index = -1,
            length = array.length,
            resIndex = 0,
            result = [];
  
        while (++index < length) {
          var value = array[index],
              computed = iteratee ? iteratee(value) : value;
  
          if (!index || !eq(computed, seen)) {
            var seen = computed;
            result[resIndex++] = value === 0 ? 0 : value;
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.toNumber` which doesn't ensure correct
       * conversions of binary, hexadecimal, or octal string values.
       *
       * @private
       * @param {*} value The value to process.
       * @returns {number} Returns the number.
       */
      function baseToNumber(value) {
        if (typeof value == 'number') {
          return value;
        }
        if (isSymbol(value)) {
          return NAN;
        }
        return +value;
      }
  
      /**
       * The base implementation of `_.toString` which doesn't convert nullish
       * values to empty strings.
       *
       * @private
       * @param {*} value The value to process.
       * @returns {string} Returns the string.
       */
      function baseToString(value) {
        // Exit early for strings to avoid a performance hit in some environments.
        if (typeof value == 'string') {
          return value;
        }
        if (isArray(value)) {
          // Recursively convert values (susceptible to call stack limits).
          return arrayMap(value, baseToString) + '';
        }
        if (isSymbol(value)) {
          return symbolToString ? symbolToString.call(value) : '';
        }
        var result = (value + '');
        return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
      }
  
      /**
       * The base implementation of `_.uniqBy` without support for iteratee shorthands.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new duplicate free array.
       */
      function baseUniq(array, iteratee, comparator) {
        var index = -1,
            includes = arrayIncludes,
            length = array.length,
            isCommon = true,
            result = [],
            seen = result;
  
        if (comparator) {
          isCommon = false;
          includes = arrayIncludesWith;
        }
        else if (length >= LARGE_ARRAY_SIZE) {
          var set = iteratee ? null : createSet(array);
          if (set) {
            return setToArray(set);
          }
          isCommon = false;
          includes = cacheHas;
          seen = new SetCache;
        }
        else {
          seen = iteratee ? [] : result;
        }
        outer:
        while (++index < length) {
          var value = array[index],
              computed = iteratee ? iteratee(value) : value;
  
          value = (comparator || value !== 0) ? value : 0;
          if (isCommon && computed === computed) {
            var seenIndex = seen.length;
            while (seenIndex--) {
              if (seen[seenIndex] === computed) {
                continue outer;
              }
            }
            if (iteratee) {
              seen.push(computed);
            }
            result.push(value);
          }
          else if (!includes(seen, computed, comparator)) {
            if (seen !== result) {
              seen.push(computed);
            }
            result.push(value);
          }
        }
        return result;
      }
  
      /**
       * The base implementation of `_.unset`.
       *
       * @private
       * @param {Object} object The object to modify.
       * @param {Array|string} path The property path to unset.
       * @returns {boolean} Returns `true` if the property is deleted, else `false`.
       */
      function baseUnset(object, path) {
        path = castPath(path, object);
        object = parent(object, path);
        return object == null || delete object[toKey(last(path))];
      }
  
      /**
       * The base implementation of `_.update`.
       *
       * @private
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to update.
       * @param {Function} updater The function to produce the updated value.
       * @param {Function} [customizer] The function to customize path creation.
       * @returns {Object} Returns `object`.
       */
      function baseUpdate(object, path, updater, customizer) {
        return baseSet(object, path, updater(baseGet(object, path)), customizer);
      }
  
      /**
       * The base implementation of methods like `_.dropWhile` and `_.takeWhile`
       * without support for iteratee shorthands.
       *
       * @private
       * @param {Array} array The array to query.
       * @param {Function} predicate The function invoked per iteration.
       * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
       * @param {boolean} [fromRight] Specify iterating from right to left.
       * @returns {Array} Returns the slice of `array`.
       */
      function baseWhile(array, predicate, isDrop, fromRight) {
        var length = array.length,
            index = fromRight ? length : -1;
  
        while ((fromRight ? index-- : ++index < length) &&
          predicate(array[index], index, array)) {}
  
        return isDrop
          ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
          : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
      }
  
      /**
       * The base implementation of `wrapperValue` which returns the result of
       * performing a sequence of actions on the unwrapped `value`, where each
       * successive action is supplied the return value of the previous.
       *
       * @private
       * @param {*} value The unwrapped value.
       * @param {Array} actions Actions to perform to resolve the unwrapped value.
       * @returns {*} Returns the resolved value.
       */
      function baseWrapperValue(value, actions) {
        var result = value;
        if (result instanceof LazyWrapper) {
          result = result.value();
        }
        return arrayReduce(actions, function(result, action) {
          return action.func.apply(action.thisArg, arrayPush([result], action.args));
        }, result);
      }
  
      /**
       * The base implementation of methods like `_.xor`, without support for
       * iteratee shorthands, that accepts an array of arrays to inspect.
       *
       * @private
       * @param {Array} arrays The arrays to inspect.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of values.
       */
      function baseXor(arrays, iteratee, comparator) {
        var length = arrays.length;
        if (length < 2) {
          return length ? baseUniq(arrays[0]) : [];
        }
        var index = -1,
            result = Array(length);
  
        while (++index < length) {
          var array = arrays[index],
              othIndex = -1;
  
          while (++othIndex < length) {
            if (othIndex != index) {
              result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator);
            }
          }
        }
        return baseUniq(baseFlatten(result, 1), iteratee, comparator);
      }
  
      /**
       * This base implementation of `_.zipObject` which assigns values using `assignFunc`.
       *
       * @private
       * @param {Array} props The property identifiers.
       * @param {Array} values The property values.
       * @param {Function} assignFunc The function to assign values.
       * @returns {Object} Returns the new object.
       */
      function baseZipObject(props, values, assignFunc) {
        var index = -1,
            length = props.length,
            valsLength = values.length,
            result = {};
  
        while (++index < length) {
          var value = index < valsLength ? values[index] : undefined;
          assignFunc(result, props[index], value);
        }
        return result;
      }
  
      /**
       * Casts `value` to an empty array if it's not an array like object.
       *
       * @private
       * @param {*} value The value to inspect.
       * @returns {Array|Object} Returns the cast array-like object.
       */
      function castArrayLikeObject(value) {
        return isArrayLikeObject(value) ? value : [];
      }
  
      /**
       * Casts `value` to `identity` if it's not a function.
       *
       * @private
       * @param {*} value The value to inspect.
       * @returns {Function} Returns cast function.
       */
      function castFunction(value) {
        return typeof value == 'function' ? value : identity;
      }
  
      /**
       * Casts `value` to a path array if it's not one.
       *
       * @private
       * @param {*} value The value to inspect.
       * @param {Object} [object] The object to query keys on.
       * @returns {Array} Returns the cast property path array.
       */
      function castPath(value, object) {
        if (isArray(value)) {
          return value;
        }
        return isKey(value, object) ? [value] : stringToPath(toString(value));
      }
  
      /**
       * A `baseRest` alias which can be replaced with `identity` by module
       * replacement plugins.
       *
       * @private
       * @type {Function}
       * @param {Function} func The function to apply a rest parameter to.
       * @returns {Function} Returns the new function.
       */
      var castRest = baseRest;
  
      /**
       * Casts `array` to a slice if it's needed.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {number} start The start position.
       * @param {number} [end=array.length] The end position.
       * @returns {Array} Returns the cast slice.
       */
      function castSlice(array, start, end) {
        var length = array.length;
        end = end === undefined ? length : end;
        return (!start && end >= length) ? array : baseSlice(array, start, end);
      }
  
      /**
       * A simple wrapper around the global [`clearTimeout`](https://mdn.io/clearTimeout).
       *
       * @private
       * @param {number|Object} id The timer id or timeout object of the timer to clear.
       */
      var clearTimeout = ctxClearTimeout || function(id) {
        return root.clearTimeout(id);
      };
  
      /**
       * Creates a clone of  `buffer`.
       *
       * @private
       * @param {Buffer} buffer The buffer to clone.
       * @param {boolean} [isDeep] Specify a deep clone.
       * @returns {Buffer} Returns the cloned buffer.
       */
      function cloneBuffer(buffer, isDeep) {
        if (isDeep) {
          return buffer.slice();
        }
        var length = buffer.length,
            result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length);
  
        buffer.copy(result);
        return result;
      }
  
      /**
       * Creates a clone of `arrayBuffer`.
       *
       * @private
       * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
       * @returns {ArrayBuffer} Returns the cloned array buffer.
       */
      function cloneArrayBuffer(arrayBuffer) {
        var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
        new Uint8Array(result).set(new Uint8Array(arrayBuffer));
        return result;
      }
  
      /**
       * Creates a clone of `dataView`.
       *
       * @private
       * @param {Object} dataView The data view to clone.
       * @param {boolean} [isDeep] Specify a deep clone.
       * @returns {Object} Returns the cloned data view.
       */
      function cloneDataView(dataView, isDeep) {
        var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;
        return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);
      }
  
      /**
       * Creates a clone of `map`.
       *
       * @private
       * @param {Object} map The map to clone.
       * @param {Function} cloneFunc The function to clone values.
       * @param {boolean} [isDeep] Specify a deep clone.
       * @returns {Object} Returns the cloned map.
       */
      function cloneMap(map, isDeep, cloneFunc) {
        var array = isDeep ? cloneFunc(mapToArray(map), CLONE_DEEP_FLAG) : mapToArray(map);
        return arrayReduce(array, addMapEntry, new map.constructor);
      }
  
      /**
       * Creates a clone of `regexp`.
       *
       * @private
       * @param {Object} regexp The regexp to clone.
       * @returns {Object} Returns the cloned regexp.
       */
      function cloneRegExp(regexp) {
        var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
        result.lastIndex = regexp.lastIndex;
        return result;
      }
  
      /**
       * Creates a clone of `set`.
       *
       * @private
       * @param {Object} set The set to clone.
       * @param {Function} cloneFunc The function to clone values.
       * @param {boolean} [isDeep] Specify a deep clone.
       * @returns {Object} Returns the cloned set.
       */
      function cloneSet(set, isDeep, cloneFunc) {
        var array = isDeep ? cloneFunc(setToArray(set), CLONE_DEEP_FLAG) : setToArray(set);
        return arrayReduce(array, addSetEntry, new set.constructor);
      }
  
      /**
       * Creates a clone of the `symbol` object.
       *
       * @private
       * @param {Object} symbol The symbol object to clone.
       * @returns {Object} Returns the cloned symbol object.
       */
      function cloneSymbol(symbol) {
        return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
      }
  
      /**
       * Creates a clone of `typedArray`.
       *
       * @private
       * @param {Object} typedArray The typed array to clone.
       * @param {boolean} [isDeep] Specify a deep clone.
       * @returns {Object} Returns the cloned typed array.
       */
      function cloneTypedArray(typedArray, isDeep) {
        var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
        return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
      }
  
      /**
       * Compares values to sort them in ascending order.
       *
       * @private
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {number} Returns the sort order indicator for `value`.
       */
      function compareAscending(value, other) {
        if (value !== other) {
          var valIsDefined = value !== undefined,
              valIsNull = value === null,
              valIsReflexive = value === value,
              valIsSymbol = isSymbol(value);
  
          var othIsDefined = other !== undefined,
              othIsNull = other === null,
              othIsReflexive = other === other,
              othIsSymbol = isSymbol(other);
  
          if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) ||
              (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) ||
              (valIsNull && othIsDefined && othIsReflexive) ||
              (!valIsDefined && othIsReflexive) ||
              !valIsReflexive) {
            return 1;
          }
          if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) ||
              (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) ||
              (othIsNull && valIsDefined && valIsReflexive) ||
              (!othIsDefined && valIsReflexive) ||
              !othIsReflexive) {
            return -1;
          }
        }
        return 0;
      }
  
      /**
       * Used by `_.orderBy` to compare multiple properties of a value to another
       * and stable sort them.
       *
       * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
       * specify an order of "desc" for descending or "asc" for ascending sort order
       * of corresponding values.
       *
       * @private
       * @param {Object} object The object to compare.
       * @param {Object} other The other object to compare.
       * @param {boolean[]|string[]} orders The order to sort by for each property.
       * @returns {number} Returns the sort order indicator for `object`.
       */
      function compareMultiple(object, other, orders) {
        var index = -1,
            objCriteria = object.criteria,
            othCriteria = other.criteria,
            length = objCriteria.length,
            ordersLength = orders.length;
  
        while (++index < length) {
          var result = compareAscending(objCriteria[index], othCriteria[index]);
          if (result) {
            if (index >= ordersLength) {
              return result;
            }
            var order = orders[index];
            return result * (order == 'desc' ? -1 : 1);
          }
        }
        // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
        // that causes it, under certain circumstances, to provide the same value for
        // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
        // for more details.
        //
        // This also ensures a stable sort in V8 and other engines.
        // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
        return object.index - other.index;
      }
  
      /**
       * Creates an array that is the composition of partially applied arguments,
       * placeholders, and provided arguments into a single array of arguments.
       *
       * @private
       * @param {Array} args The provided arguments.
       * @param {Array} partials The arguments to prepend to those provided.
       * @param {Array} holders The `partials` placeholder indexes.
       * @params {boolean} [isCurried] Specify composing for a curried function.
       * @returns {Array} Returns the new array of composed arguments.
       */
      function composeArgs(args, partials, holders, isCurried) {
        var argsIndex = -1,
            argsLength = args.length,
            holdersLength = holders.length,
            leftIndex = -1,
            leftLength = partials.length,
            rangeLength = nativeMax(argsLength - holdersLength, 0),
            result = Array(leftLength + rangeLength),
            isUncurried = !isCurried;
  
        while (++leftIndex < leftLength) {
          result[leftIndex] = partials[leftIndex];
        }
        while (++argsIndex < holdersLength) {
          if (isUncurried || argsIndex < argsLength) {
            result[holders[argsIndex]] = args[argsIndex];
          }
        }
        while (rangeLength--) {
          result[leftIndex++] = args[argsIndex++];
        }
        return result;
      }
  
      /**
       * This function is like `composeArgs` except that the arguments composition
       * is tailored for `_.partialRight`.
       *
       * @private
       * @param {Array} args The provided arguments.
       * @param {Array} partials The arguments to append to those provided.
       * @param {Array} holders The `partials` placeholder indexes.
       * @params {boolean} [isCurried] Specify composing for a curried function.
       * @returns {Array} Returns the new array of composed arguments.
       */
      function composeArgsRight(args, partials, holders, isCurried) {
        var argsIndex = -1,
            argsLength = args.length,
            holdersIndex = -1,
            holdersLength = holders.length,
            rightIndex = -1,
            rightLength = partials.length,
            rangeLength = nativeMax(argsLength - holdersLength, 0),
            result = Array(rangeLength + rightLength),
            isUncurried = !isCurried;
  
        while (++argsIndex < rangeLength) {
          result[argsIndex] = args[argsIndex];
        }
        var offset = argsIndex;
        while (++rightIndex < rightLength) {
          result[offset + rightIndex] = partials[rightIndex];
        }
        while (++holdersIndex < holdersLength) {
          if (isUncurried || argsIndex < argsLength) {
            result[offset + holders[holdersIndex]] = args[argsIndex++];
          }
        }
        return result;
      }
  
      /**
       * Copies the values of `source` to `array`.
       *
       * @private
       * @param {Array} source The array to copy values from.
       * @param {Array} [array=[]] The array to copy values to.
       * @returns {Array} Returns `array`.
       */
      function copyArray(source, array) {
        var index = -1,
            length = source.length;
  
        array || (array = Array(length));
        while (++index < length) {
          array[index] = source[index];
        }
        return array;
      }
  
      /**
       * Copies properties of `source` to `object`.
       *
       * @private
       * @param {Object} source The object to copy properties from.
       * @param {Array} props The property identifiers to copy.
       * @param {Object} [object={}] The object to copy properties to.
       * @param {Function} [customizer] The function to customize copied values.
       * @returns {Object} Returns `object`.
       */
      function copyObject(source, props, object, customizer) {
        var isNew = !object;
        object || (object = {});
  
        var index = -1,
            length = props.length;
  
        while (++index < length) {
          var key = props[index];
  
          var newValue = customizer
            ? customizer(object[key], source[key], key, object, source)
            : undefined;
  
          if (newValue === undefined) {
            newValue = source[key];
          }
          if (isNew) {
            baseAssignValue(object, key, newValue);
          } else {
            assignValue(object, key, newValue);
          }
        }
        return object;
      }
  
      /**
       * Copies own symbols of `source` to `object`.
       *
       * @private
       * @param {Object} source The object to copy symbols from.
       * @param {Object} [object={}] The object to copy symbols to.
       * @returns {Object} Returns `object`.
       */
      function copySymbols(source, object) {
        return copyObject(source, getSymbols(source), object);
      }
  
      /**
       * Copies own and inherited symbols of `source` to `object`.
       *
       * @private
       * @param {Object} source The object to copy symbols from.
       * @param {Object} [object={}] The object to copy symbols to.
       * @returns {Object} Returns `object`.
       */
      function copySymbolsIn(source, object) {
        return copyObject(source, getSymbolsIn(source), object);
      }
  
      /**
       * Creates a function like `_.groupBy`.
       *
       * @private
       * @param {Function} setter The function to set accumulator values.
       * @param {Function} [initializer] The accumulator object initializer.
       * @returns {Function} Returns the new aggregator function.
       */
      function createAggregator(setter, initializer) {
        return function(collection, iteratee) {
          var func = isArray(collection) ? arrayAggregator : baseAggregator,
              accumulator = initializer ? initializer() : {};
  
          return func(collection, setter, getIteratee(iteratee, 2), accumulator);
        };
      }
  
      /**
       * Creates a function like `_.assign`.
       *
       * @private
       * @param {Function} assigner The function to assign values.
       * @returns {Function} Returns the new assigner function.
       */
      function createAssigner(assigner) {
        return baseRest(function(object, sources) {
          var index = -1,
              length = sources.length,
              customizer = length > 1 ? sources[length - 1] : undefined,
              guard = length > 2 ? sources[2] : undefined;
  
          customizer = (assigner.length > 3 && typeof customizer == 'function')
            ? (length--, customizer)
            : undefined;
  
          if (guard && isIterateeCall(sources[0], sources[1], guard)) {
            customizer = length < 3 ? undefined : customizer;
            length = 1;
          }
          object = Object(object);
          while (++index < length) {
            var source = sources[index];
            if (source) {
              assigner(object, source, index, customizer);
            }
          }
          return object;
        });
      }
  
      /**
       * Creates a `baseEach` or `baseEachRight` function.
       *
       * @private
       * @param {Function} eachFunc The function to iterate over a collection.
       * @param {boolean} [fromRight] Specify iterating from right to left.
       * @returns {Function} Returns the new base function.
       */
      function createBaseEach(eachFunc, fromRight) {
        return function(collection, iteratee) {
          if (collection == null) {
            return collection;
          }
          if (!isArrayLike(collection)) {
            return eachFunc(collection, iteratee);
          }
          var length = collection.length,
              index = fromRight ? length : -1,
              iterable = Object(collection);
  
          while ((fromRight ? index-- : ++index < length)) {
            if (iteratee(iterable[index], index, iterable) === false) {
              break;
            }
          }
          return collection;
        };
      }
  
      /**
       * Creates a base function for methods like `_.forIn` and `_.forOwn`.
       *
       * @private
       * @param {boolean} [fromRight] Specify iterating from right to left.
       * @returns {Function} Returns the new base function.
       */
      function createBaseFor(fromRight) {
        return function(object, iteratee, keysFunc) {
          var index = -1,
              iterable = Object(object),
              props = keysFunc(object),
              length = props.length;
  
          while (length--) {
            var key = props[fromRight ? length : ++index];
            if (iteratee(iterable[key], key, iterable) === false) {
              break;
            }
          }
          return object;
        };
      }
  
      /**
       * Creates a function that wraps `func` to invoke it with the optional `this`
       * binding of `thisArg`.
       *
       * @private
       * @param {Function} func The function to wrap.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @param {*} [thisArg] The `this` binding of `func`.
       * @returns {Function} Returns the new wrapped function.
       */
      function createBind(func, bitmask, thisArg) {
        var isBind = bitmask & WRAP_BIND_FLAG,
            Ctor = createCtor(func);
  
        function wrapper() {
          var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
          return fn.apply(isBind ? thisArg : this, arguments);
        }
        return wrapper;
      }
  
      /**
       * Creates a function like `_.lowerFirst`.
       *
       * @private
       * @param {string} methodName The name of the `String` case method to use.
       * @returns {Function} Returns the new case function.
       */
      function createCaseFirst(methodName) {
        return function(string) {
          string = toString(string);
  
          var strSymbols = hasUnicode(string)
            ? stringToArray(string)
            : undefined;
  
          var chr = strSymbols
            ? strSymbols[0]
            : string.charAt(0);
  
          var trailing = strSymbols
            ? castSlice(strSymbols, 1).join('')
            : string.slice(1);
  
          return chr[methodName]() + trailing;
        };
      }
  
      /**
       * Creates a function like `_.camelCase`.
       *
       * @private
       * @param {Function} callback The function to combine each word.
       * @returns {Function} Returns the new compounder function.
       */
      function createCompounder(callback) {
        return function(string) {
          return arrayReduce(words(deburr(string).replace(reApos, '')), callback, '');
        };
      }
  
      /**
       * Creates a function that produces an instance of `Ctor` regardless of
       * whether it was invoked as part of a `new` expression or by `call` or `apply`.
       *
       * @private
       * @param {Function} Ctor The constructor to wrap.
       * @returns {Function} Returns the new wrapped function.
       */
      function createCtor(Ctor) {
        return function() {
          // Use a `switch` statement to work with class constructors. See
          // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
          // for more details.
          var args = arguments;
          switch (args.length) {
            case 0: return new Ctor;
            case 1: return new Ctor(args[0]);
            case 2: return new Ctor(args[0], args[1]);
            case 3: return new Ctor(args[0], args[1], args[2]);
            case 4: return new Ctor(args[0], args[1], args[2], args[3]);
            case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]);
            case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]);
            case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
          }
          var thisBinding = baseCreate(Ctor.prototype),
              result = Ctor.apply(thisBinding, args);
  
          // Mimic the constructor's `return` behavior.
          // See https://es5.github.io/#x13.2.2 for more details.
          return isObject(result) ? result : thisBinding;
        };
      }
  
      /**
       * Creates a function that wraps `func` to enable currying.
       *
       * @private
       * @param {Function} func The function to wrap.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @param {number} arity The arity of `func`.
       * @returns {Function} Returns the new wrapped function.
       */
      function createCurry(func, bitmask, arity) {
        var Ctor = createCtor(func);
  
        function wrapper() {
          var length = arguments.length,
              args = Array(length),
              index = length,
              placeholder = getHolder(wrapper);
  
          while (index--) {
            args[index] = arguments[index];
          }
          var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder)
            ? []
            : replaceHolders(args, placeholder);
  
          length -= holders.length;
          if (length < arity) {
            return createRecurry(
              func, bitmask, createHybrid, wrapper.placeholder, undefined,
              args, holders, undefined, undefined, arity - length);
          }
          var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
          return apply(fn, this, args);
        }
        return wrapper;
      }
  
      /**
       * Creates a `_.find` or `_.findLast` function.
       *
       * @private
       * @param {Function} findIndexFunc The function to find the collection index.
       * @returns {Function} Returns the new find function.
       */
      function createFind(findIndexFunc) {
        return function(collection, predicate, fromIndex) {
          var iterable = Object(collection);
          if (!isArrayLike(collection)) {
            var iteratee = getIteratee(predicate, 3);
            collection = keys(collection);
            predicate = function(key) { return iteratee(iterable[key], key, iterable); };
          }
          var index = findIndexFunc(collection, predicate, fromIndex);
          return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
        };
      }
  
      /**
       * Creates a `_.flow` or `_.flowRight` function.
       *
       * @private
       * @param {boolean} [fromRight] Specify iterating from right to left.
       * @returns {Function} Returns the new flow function.
       */
      function createFlow(fromRight) {
        return flatRest(function(funcs) {
          var length = funcs.length,
              index = length,
              prereq = LodashWrapper.prototype.thru;
  
          if (fromRight) {
            funcs.reverse();
          }
          while (index--) {
            var func = funcs[index];
            if (typeof func != 'function') {
              throw new TypeError(FUNC_ERROR_TEXT);
            }
            if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
              var wrapper = new LodashWrapper([], true);
            }
          }
          index = wrapper ? index : length;
          while (++index < length) {
            func = funcs[index];
  
            var funcName = getFuncName(func),
                data = funcName == 'wrapper' ? getData(func) : undefined;
  
            if (data && isLaziable(data[0]) &&
                  data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) &&
                  !data[4].length && data[9] == 1
                ) {
              wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
            } else {
              wrapper = (func.length == 1 && isLaziable(func))
                ? wrapper[funcName]()
                : wrapper.thru(func);
            }
          }
          return function() {
            var args = arguments,
                value = args[0];
  
            if (wrapper && args.length == 1 && isArray(value)) {
              return wrapper.plant(value).value();
            }
            var index = 0,
                result = length ? funcs[index].apply(this, args) : value;
  
            while (++index < length) {
              result = funcs[index].call(this, result);
            }
            return result;
          };
        });
      }
  
      /**
       * Creates a function that wraps `func` to invoke it with optional `this`
       * binding of `thisArg`, partial application, and currying.
       *
       * @private
       * @param {Function|string} func The function or method name to wrap.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @param {*} [thisArg] The `this` binding of `func`.
       * @param {Array} [partials] The arguments to prepend to those provided to
       *  the new function.
       * @param {Array} [holders] The `partials` placeholder indexes.
       * @param {Array} [partialsRight] The arguments to append to those provided
       *  to the new function.
       * @param {Array} [holdersRight] The `partialsRight` placeholder indexes.
       * @param {Array} [argPos] The argument positions of the new function.
       * @param {number} [ary] The arity cap of `func`.
       * @param {number} [arity] The arity of `func`.
       * @returns {Function} Returns the new wrapped function.
       */
      function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
        var isAry = bitmask & WRAP_ARY_FLAG,
            isBind = bitmask & WRAP_BIND_FLAG,
            isBindKey = bitmask & WRAP_BIND_KEY_FLAG,
            isCurried = bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG),
            isFlip = bitmask & WRAP_FLIP_FLAG,
            Ctor = isBindKey ? undefined : createCtor(func);
  
        function wrapper() {
          var length = arguments.length,
              args = Array(length),
              index = length;
  
          while (index--) {
            args[index] = arguments[index];
          }
          if (isCurried) {
            var placeholder = getHolder(wrapper),
                holdersCount = countHolders(args, placeholder);
          }
          if (partials) {
            args = composeArgs(args, partials, holders, isCurried);
          }
          if (partialsRight) {
            args = composeArgsRight(args, partialsRight, holdersRight, isCurried);
          }
          length -= holdersCount;
          if (isCurried && length < arity) {
            var newHolders = replaceHolders(args, placeholder);
            return createRecurry(
              func, bitmask, createHybrid, wrapper.placeholder, thisArg,
              args, newHolders, argPos, ary, arity - length
            );
          }
          var thisBinding = isBind ? thisArg : this,
              fn = isBindKey ? thisBinding[func] : func;
  
          length = args.length;
          if (argPos) {
            args = reorder(args, argPos);
          } else if (isFlip && length > 1) {
            args.reverse();
          }
          if (isAry && ary < length) {
            args.length = ary;
          }
          if (this && this !== root && this instanceof wrapper) {
            fn = Ctor || createCtor(fn);
          }
          return fn.apply(thisBinding, args);
        }
        return wrapper;
      }
  
      /**
       * Creates a function like `_.invertBy`.
       *
       * @private
       * @param {Function} setter The function to set accumulator values.
       * @param {Function} toIteratee The function to resolve iteratees.
       * @returns {Function} Returns the new inverter function.
       */
      function createInverter(setter, toIteratee) {
        return function(object, iteratee) {
          return baseInverter(object, setter, toIteratee(iteratee), {});
        };
      }
  
      /**
       * Creates a function that performs a mathematical operation on two values.
       *
       * @private
       * @param {Function} operator The function to perform the operation.
       * @param {number} [defaultValue] The value used for `undefined` arguments.
       * @returns {Function} Returns the new mathematical operation function.
       */
      function createMathOperation(operator, defaultValue) {
        return function(value, other) {
          var result;
          if (value === undefined && other === undefined) {
            return defaultValue;
          }
          if (value !== undefined) {
            result = value;
          }
          if (other !== undefined) {
            if (result === undefined) {
              return other;
            }
            if (typeof value == 'string' || typeof other == 'string') {
              value = baseToString(value);
              other = baseToString(other);
            } else {
              value = baseToNumber(value);
              other = baseToNumber(other);
            }
            result = operator(value, other);
          }
          return result;
        };
      }
  
      /**
       * Creates a function like `_.over`.
       *
       * @private
       * @param {Function} arrayFunc The function to iterate over iteratees.
       * @returns {Function} Returns the new over function.
       */
      function createOver(arrayFunc) {
        return flatRest(function(iteratees) {
          iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
          return baseRest(function(args) {
            var thisArg = this;
            return arrayFunc(iteratees, function(iteratee) {
              return apply(iteratee, thisArg, args);
            });
          });
        });
      }
  
      /**
       * Creates the padding for `string` based on `length`. The `chars` string
       * is truncated if the number of characters exceeds `length`.
       *
       * @private
       * @param {number} length The padding length.
       * @param {string} [chars=' '] The string used as padding.
       * @returns {string} Returns the padding for `string`.
       */
      function createPadding(length, chars) {
        chars = chars === undefined ? ' ' : baseToString(chars);
  
        var charsLength = chars.length;
        if (charsLength < 2) {
          return charsLength ? baseRepeat(chars, length) : chars;
        }
        var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
        return hasUnicode(chars)
          ? castSlice(stringToArray(result), 0, length).join('')
          : result.slice(0, length);
      }
  
      /**
       * Creates a function that wraps `func` to invoke it with the `this` binding
       * of `thisArg` and `partials` prepended to the arguments it receives.
       *
       * @private
       * @param {Function} func The function to wrap.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @param {*} thisArg The `this` binding of `func`.
       * @param {Array} partials The arguments to prepend to those provided to
       *  the new function.
       * @returns {Function} Returns the new wrapped function.
       */
      function createPartial(func, bitmask, thisArg, partials) {
        var isBind = bitmask & WRAP_BIND_FLAG,
            Ctor = createCtor(func);
  
        function wrapper() {
          var argsIndex = -1,
              argsLength = arguments.length,
              leftIndex = -1,
              leftLength = partials.length,
              args = Array(leftLength + argsLength),
              fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
  
          while (++leftIndex < leftLength) {
            args[leftIndex] = partials[leftIndex];
          }
          while (argsLength--) {
            args[leftIndex++] = arguments[++argsIndex];
          }
          return apply(fn, isBind ? thisArg : this, args);
        }
        return wrapper;
      }
  
      /**
       * Creates a `_.range` or `_.rangeRight` function.
       *
       * @private
       * @param {boolean} [fromRight] Specify iterating from right to left.
       * @returns {Function} Returns the new range function.
       */
      function createRange(fromRight) {
        return function(start, end, step) {
          if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
            end = step = undefined;
          }
          // Ensure the sign of `-0` is preserved.
          start = toFinite(start);
          if (end === undefined) {
            end = start;
            start = 0;
          } else {
            end = toFinite(end);
          }
          step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);
          return baseRange(start, end, step, fromRight);
        };
      }
  
      /**
       * Creates a function that performs a relational operation on two values.
       *
       * @private
       * @param {Function} operator The function to perform the operation.
       * @returns {Function} Returns the new relational operation function.
       */
      function createRelationalOperation(operator) {
        return function(value, other) {
          if (!(typeof value == 'string' && typeof other == 'string')) {
            value = toNumber(value);
            other = toNumber(other);
          }
          return operator(value, other);
        };
      }
  
      /**
       * Creates a function that wraps `func` to continue currying.
       *
       * @private
       * @param {Function} func The function to wrap.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @param {Function} wrapFunc The function to create the `func` wrapper.
       * @param {*} placeholder The placeholder value.
       * @param {*} [thisArg] The `this` binding of `func`.
       * @param {Array} [partials] The arguments to prepend to those provided to
       *  the new function.
       * @param {Array} [holders] The `partials` placeholder indexes.
       * @param {Array} [argPos] The argument positions of the new function.
       * @param {number} [ary] The arity cap of `func`.
       * @param {number} [arity] The arity of `func`.
       * @returns {Function} Returns the new wrapped function.
       */
      function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
        var isCurry = bitmask & WRAP_CURRY_FLAG,
            newHolders = isCurry ? holders : undefined,
            newHoldersRight = isCurry ? undefined : holders,
            newPartials = isCurry ? partials : undefined,
            newPartialsRight = isCurry ? undefined : partials;
  
        bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG);
        bitmask &= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG);
  
        if (!(bitmask & WRAP_CURRY_BOUND_FLAG)) {
          bitmask &= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG);
        }
        var newData = [
          func, bitmask, thisArg, newPartials, newHolders, newPartialsRight,
          newHoldersRight, argPos, ary, arity
        ];
  
        var result = wrapFunc.apply(undefined, newData);
        if (isLaziable(func)) {
          setData(result, newData);
        }
        result.placeholder = placeholder;
        return setWrapToString(result, func, bitmask);
      }
  
      /**
       * Creates a function like `_.round`.
       *
       * @private
       * @param {string} methodName The name of the `Math` method to use when rounding.
       * @returns {Function} Returns the new round function.
       */
      function createRound(methodName) {
        var func = Math[methodName];
        return function(number, precision) {
          number = toNumber(number);
          precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
          if (precision) {
            // Shift with exponential notation to avoid floating-point issues.
            // See [MDN](https://mdn.io/round#Examples) for more details.
            var pair = (toString(number) + 'e').split('e'),
                value = func(pair[0] + 'e' + (+pair[1] + precision));
  
            pair = (toString(value) + 'e').split('e');
            return +(pair[0] + 'e' + (+pair[1] - precision));
          }
          return func(number);
        };
      }
  
      /**
       * Creates a set object of `values`.
       *
       * @private
       * @param {Array} values The values to add to the set.
       * @returns {Object} Returns the new set.
       */
      var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {
        return new Set(values);
      };
  
      /**
       * Creates a `_.toPairs` or `_.toPairsIn` function.
       *
       * @private
       * @param {Function} keysFunc The function to get the keys of a given object.
       * @returns {Function} Returns the new pairs function.
       */
      function createToPairs(keysFunc) {
        return function(object) {
          var tag = getTag(object);
          if (tag == mapTag) {
            return mapToArray(object);
          }
          if (tag == setTag) {
            return setToPairs(object);
          }
          return baseToPairs(object, keysFunc(object));
        };
      }
  
      /**
       * Creates a function that either curries or invokes `func` with optional
       * `this` binding and partially applied arguments.
       *
       * @private
       * @param {Function|string} func The function or method name to wrap.
       * @param {number} bitmask The bitmask flags.
       *    1 - `_.bind`
       *    2 - `_.bindKey`
       *    4 - `_.curry` or `_.curryRight` of a bound function
       *    8 - `_.curry`
       *   16 - `_.curryRight`
       *   32 - `_.partial`
       *   64 - `_.partialRight`
       *  128 - `_.rearg`
       *  256 - `_.ary`
       *  512 - `_.flip`
       * @param {*} [thisArg] The `this` binding of `func`.
       * @param {Array} [partials] The arguments to be partially applied.
       * @param {Array} [holders] The `partials` placeholder indexes.
       * @param {Array} [argPos] The argument positions of the new function.
       * @param {number} [ary] The arity cap of `func`.
       * @param {number} [arity] The arity of `func`.
       * @returns {Function} Returns the new wrapped function.
       */
      function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
        var isBindKey = bitmask & WRAP_BIND_KEY_FLAG;
        if (!isBindKey && typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        var length = partials ? partials.length : 0;
        if (!length) {
          bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);
          partials = holders = undefined;
        }
        ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);
        arity = arity === undefined ? arity : toInteger(arity);
        length -= holders ? holders.length : 0;
  
        if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {
          var partialsRight = partials,
              holdersRight = holders;
  
          partials = holders = undefined;
        }
        var data = isBindKey ? undefined : getData(func);
  
        var newData = [
          func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
          argPos, ary, arity
        ];
  
        if (data) {
          mergeData(newData, data);
        }
        func = newData[0];
        bitmask = newData[1];
        thisArg = newData[2];
        partials = newData[3];
        holders = newData[4];
        arity = newData[9] = newData[9] === undefined
          ? (isBindKey ? 0 : func.length)
          : nativeMax(newData[9] - length, 0);
  
        if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
          bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
        }
        if (!bitmask || bitmask == WRAP_BIND_FLAG) {
          var result = createBind(func, bitmask, thisArg);
        } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
          result = createCurry(func, bitmask, arity);
        } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {
          result = createPartial(func, bitmask, thisArg, partials);
        } else {
          result = createHybrid.apply(undefined, newData);
        }
        var setter = data ? baseSetData : setData;
        return setWrapToString(setter(result, newData), func, bitmask);
      }
  
      /**
       * Used by `_.defaults` to customize its `_.assignIn` use to assign properties
       * of source objects to the destination object for all destination properties
       * that resolve to `undefined`.
       *
       * @private
       * @param {*} objValue The destination value.
       * @param {*} srcValue The source value.
       * @param {string} key The key of the property to assign.
       * @param {Object} object The parent object of `objValue`.
       * @returns {*} Returns the value to assign.
       */
      function customDefaultsAssignIn(objValue, srcValue, key, object) {
        if (objValue === undefined ||
            (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
          return srcValue;
        }
        return objValue;
      }
  
      /**
       * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source
       * objects into destination objects that are passed thru.
       *
       * @private
       * @param {*} objValue The destination value.
       * @param {*} srcValue The source value.
       * @param {string} key The key of the property to merge.
       * @param {Object} object The parent object of `objValue`.
       * @param {Object} source The parent object of `srcValue`.
       * @param {Object} [stack] Tracks traversed source values and their merged
       *  counterparts.
       * @returns {*} Returns the value to assign.
       */
      function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
        if (isObject(objValue) && isObject(srcValue)) {
          // Recursively merge objects and arrays (susceptible to call stack limits).
          stack.set(srcValue, objValue);
          baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
          stack['delete'](srcValue);
        }
        return objValue;
      }
  
      /**
       * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain
       * objects.
       *
       * @private
       * @param {*} value The value to inspect.
       * @param {string} key The key of the property to inspect.
       * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`.
       */
      function customOmitClone(value) {
        return isPlainObject(value) ? undefined : value;
      }
  
      /**
       * A specialized version of `baseIsEqualDeep` for arrays with support for
       * partial deep comparisons.
       *
       * @private
       * @param {Array} array The array to compare.
       * @param {Array} other The other array to compare.
       * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
       * @param {Function} customizer The function to customize comparisons.
       * @param {Function} equalFunc The function to determine equivalents of values.
       * @param {Object} stack Tracks traversed `array` and `other` objects.
       * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
       */
      function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {
        var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
            arrLength = array.length,
            othLength = other.length;
  
        if (arrLength != othLength && !(isPartial && othLength > arrLength)) {
          return false;
        }
        // Assume cyclic values are equal.
        var stacked = stack.get(array);
        if (stacked && stack.get(other)) {
          return stacked == other;
        }
        var index = -1,
            result = true,
            seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;
  
        stack.set(array, other);
        stack.set(other, array);
  
        // Ignore non-index properties.
        while (++index < arrLength) {
          var arrValue = array[index],
              othValue = other[index];
  
          if (customizer) {
            var compared = isPartial
              ? customizer(othValue, arrValue, index, other, array, stack)
              : customizer(arrValue, othValue, index, array, other, stack);
          }
          if (compared !== undefined) {
            if (compared) {
              continue;
            }
            result = false;
            break;
          }
          // Recursively compare arrays (susceptible to call stack limits).
          if (seen) {
            if (!arraySome(other, function(othValue, othIndex) {
                  if (!cacheHas(seen, othIndex) &&
                      (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {
                    return seen.push(othIndex);
                  }
                })) {
              result = false;
              break;
            }
          } else if (!(
                arrValue === othValue ||
                  equalFunc(arrValue, othValue, bitmask, customizer, stack)
              )) {
            result = false;
            break;
          }
        }
        stack['delete'](array);
        stack['delete'](other);
        return result;
      }
  
      /**
       * A specialized version of `baseIsEqualDeep` for comparing objects of
       * the same `toStringTag`.
       *
       * **Note:** This function only supports comparing values with tags of
       * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
       *
       * @private
       * @param {Object} object The object to compare.
       * @param {Object} other The other object to compare.
       * @param {string} tag The `toStringTag` of the objects to compare.
       * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
       * @param {Function} customizer The function to customize comparisons.
       * @param {Function} equalFunc The function to determine equivalents of values.
       * @param {Object} stack Tracks traversed `object` and `other` objects.
       * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
       */
      function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {
        switch (tag) {
          case dataViewTag:
            if ((object.byteLength != other.byteLength) ||
                (object.byteOffset != other.byteOffset)) {
              return false;
            }
            object = object.buffer;
            other = other.buffer;
  
          case arrayBufferTag:
            if ((object.byteLength != other.byteLength) ||
                !equalFunc(new Uint8Array(object), new Uint8Array(other))) {
              return false;
            }
            return true;
  
          case boolTag:
          case dateTag:
          case numberTag:
            // Coerce booleans to `1` or `0` and dates to milliseconds.
            // Invalid dates are coerced to `NaN`.
            return eq(+object, +other);
  
          case errorTag:
            return object.name == other.name && object.message == other.message;
  
          case regexpTag:
          case stringTag:
            // Coerce regexes to strings and treat strings, primitives and objects,
            // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
            // for more details.
            return object == (other + '');
  
          case mapTag:
            var convert = mapToArray;
  
          case setTag:
            var isPartial = bitmask & COMPARE_PARTIAL_FLAG;
            convert || (convert = setToArray);
  
            if (object.size != other.size && !isPartial) {
              return false;
            }
            // Assume cyclic values are equal.
            var stacked = stack.get(object);
            if (stacked) {
              return stacked == other;
            }
            bitmask |= COMPARE_UNORDERED_FLAG;
  
            // Recursively compare objects (susceptible to call stack limits).
            stack.set(object, other);
            var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);
            stack['delete'](object);
            return result;
  
          case symbolTag:
            if (symbolValueOf) {
              return symbolValueOf.call(object) == symbolValueOf.call(other);
            }
        }
        return false;
      }
  
      /**
       * A specialized version of `baseIsEqualDeep` for objects with support for
       * partial deep comparisons.
       *
       * @private
       * @param {Object} object The object to compare.
       * @param {Object} other The other object to compare.
       * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
       * @param {Function} customizer The function to customize comparisons.
       * @param {Function} equalFunc The function to determine equivalents of values.
       * @param {Object} stack Tracks traversed `object` and `other` objects.
       * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
       */
      function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {
        var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
            objProps = getAllKeys(object),
            objLength = objProps.length,
            othProps = getAllKeys(other),
            othLength = othProps.length;
  
        if (objLength != othLength && !isPartial) {
          return false;
        }
        var index = objLength;
        while (index--) {
          var key = objProps[index];
          if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
            return false;
          }
        }
        // Assume cyclic values are equal.
        var stacked = stack.get(object);
        if (stacked && stack.get(other)) {
          return stacked == other;
        }
        var result = true;
        stack.set(object, other);
        stack.set(other, object);
  
        var skipCtor = isPartial;
        while (++index < objLength) {
          key = objProps[index];
          var objValue = object[key],
              othValue = other[key];
  
          if (customizer) {
            var compared = isPartial
              ? customizer(othValue, objValue, key, other, object, stack)
              : customizer(objValue, othValue, key, object, other, stack);
          }
          // Recursively compare objects (susceptible to call stack limits).
          if (!(compared === undefined
                ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))
                : compared
              )) {
            result = false;
            break;
          }
          skipCtor || (skipCtor = key == 'constructor');
        }
        if (result && !skipCtor) {
          var objCtor = object.constructor,
              othCtor = other.constructor;
  
          // Non `Object` object instances with different constructors are not equal.
          if (objCtor != othCtor &&
              ('constructor' in object && 'constructor' in other) &&
              !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
                typeof othCtor == 'function' && othCtor instanceof othCtor)) {
            result = false;
          }
        }
        stack['delete'](object);
        stack['delete'](other);
        return result;
      }
  
      /**
       * A specialized version of `baseRest` which flattens the rest array.
       *
       * @private
       * @param {Function} func The function to apply a rest parameter to.
       * @returns {Function} Returns the new function.
       */
      function flatRest(func) {
        return setToString(overRest(func, undefined, flatten), func + '');
      }
  
      /**
       * Creates an array of own enumerable property names and symbols of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names and symbols.
       */
      function getAllKeys(object) {
        return baseGetAllKeys(object, keys, getSymbols);
      }
  
      /**
       * Creates an array of own and inherited enumerable property names and
       * symbols of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names and symbols.
       */
      function getAllKeysIn(object) {
        return baseGetAllKeys(object, keysIn, getSymbolsIn);
      }
  
      /**
       * Gets metadata for `func`.
       *
       * @private
       * @param {Function} func The function to query.
       * @returns {*} Returns the metadata for `func`.
       */
      var getData = !metaMap ? noop : function(func) {
        return metaMap.get(func);
      };
  
      /**
       * Gets the name of `func`.
       *
       * @private
       * @param {Function} func The function to query.
       * @returns {string} Returns the function name.
       */
      function getFuncName(func) {
        var result = (func.name + ''),
            array = realNames[result],
            length = hasOwnProperty.call(realNames, result) ? array.length : 0;
  
        while (length--) {
          var data = array[length],
              otherFunc = data.func;
          if (otherFunc == null || otherFunc == func) {
            return data.name;
          }
        }
        return result;
      }
  
      /**
       * Gets the argument placeholder value for `func`.
       *
       * @private
       * @param {Function} func The function to inspect.
       * @returns {*} Returns the placeholder value.
       */
      function getHolder(func) {
        var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func;
        return object.placeholder;
      }
  
      /**
       * Gets the appropriate "iteratee" function. If `_.iteratee` is customized,
       * this function returns the custom method, otherwise it returns `baseIteratee`.
       * If arguments are provided, the chosen function is invoked with them and
       * its result is returned.
       *
       * @private
       * @param {*} [value] The value to convert to an iteratee.
       * @param {number} [arity] The arity of the created iteratee.
       * @returns {Function} Returns the chosen function or its result.
       */
      function getIteratee() {
        var result = lodash.iteratee || iteratee;
        result = result === iteratee ? baseIteratee : result;
        return arguments.length ? result(arguments[0], arguments[1]) : result;
      }
  
      /**
       * Gets the data for `map`.
       *
       * @private
       * @param {Object} map The map to query.
       * @param {string} key The reference key.
       * @returns {*} Returns the map data.
       */
      function getMapData(map, key) {
        var data = map.__data__;
        return isKeyable(key)
          ? data[typeof key == 'string' ? 'string' : 'hash']
          : data.map;
      }
  
      /**
       * Gets the property names, values, and compare flags of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the match data of `object`.
       */
      function getMatchData(object) {
        var result = keys(object),
            length = result.length;
  
        while (length--) {
          var key = result[length],
              value = object[key];
  
          result[length] = [key, value, isStrictComparable(value)];
        }
        return result;
      }
  
      /**
       * Gets the native function at `key` of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {string} key The key of the method to get.
       * @returns {*} Returns the function if it's native, else `undefined`.
       */
      function getNative(object, key) {
        var value = getValue(object, key);
        return baseIsNative(value) ? value : undefined;
      }
  
      /**
       * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
       *
       * @private
       * @param {*} value The value to query.
       * @returns {string} Returns the raw `toStringTag`.
       */
      function getRawTag(value) {
        var isOwn = hasOwnProperty.call(value, symToStringTag),
            tag = value[symToStringTag];
  
        try {
          value[symToStringTag] = undefined;
          var unmasked = true;
        } catch (e) {}
  
        var result = nativeObjectToString.call(value);
        if (unmasked) {
          if (isOwn) {
            value[symToStringTag] = tag;
          } else {
            delete value[symToStringTag];
          }
        }
        return result;
      }
  
      /**
       * Creates an array of the own enumerable symbols of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of symbols.
       */
      var getSymbols = !nativeGetSymbols ? stubArray : function(object) {
        if (object == null) {
          return [];
        }
        object = Object(object);
        return arrayFilter(nativeGetSymbols(object), function(symbol) {
          return propertyIsEnumerable.call(object, symbol);
        });
      };
  
      /**
       * Creates an array of the own and inherited enumerable symbols of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of symbols.
       */
      var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
        var result = [];
        while (object) {
          arrayPush(result, getSymbols(object));
          object = getPrototype(object);
        }
        return result;
      };
  
      /**
       * Gets the `toStringTag` of `value`.
       *
       * @private
       * @param {*} value The value to query.
       * @returns {string} Returns the `toStringTag`.
       */
      var getTag = baseGetTag;
  
      // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
      if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
          (Map && getTag(new Map) != mapTag) ||
          (Promise && getTag(Promise.resolve()) != promiseTag) ||
          (Set && getTag(new Set) != setTag) ||
          (WeakMap && getTag(new WeakMap) != weakMapTag)) {
        getTag = function(value) {
          var result = baseGetTag(value),
              Ctor = result == objectTag ? value.constructor : undefined,
              ctorString = Ctor ? toSource(Ctor) : '';
  
          if (ctorString) {
            switch (ctorString) {
              case dataViewCtorString: return dataViewTag;
              case mapCtorString: return mapTag;
              case promiseCtorString: return promiseTag;
              case setCtorString: return setTag;
              case weakMapCtorString: return weakMapTag;
            }
          }
          return result;
        };
      }
  
      /**
       * Gets the view, applying any `transforms` to the `start` and `end` positions.
       *
       * @private
       * @param {number} start The start of the view.
       * @param {number} end The end of the view.
       * @param {Array} transforms The transformations to apply to the view.
       * @returns {Object} Returns an object containing the `start` and `end`
       *  positions of the view.
       */
      function getView(start, end, transforms) {
        var index = -1,
            length = transforms.length;
  
        while (++index < length) {
          var data = transforms[index],
              size = data.size;
  
          switch (data.type) {
            case 'drop':      start += size; break;
            case 'dropRight': end -= size; break;
            case 'take':      end = nativeMin(end, start + size); break;
            case 'takeRight': start = nativeMax(start, end - size); break;
          }
        }
        return { 'start': start, 'end': end };
      }
  
      /**
       * Extracts wrapper details from the `source` body comment.
       *
       * @private
       * @param {string} source The source to inspect.
       * @returns {Array} Returns the wrapper details.
       */
      function getWrapDetails(source) {
        var match = source.match(reWrapDetails);
        return match ? match[1].split(reSplitDetails) : [];
      }
  
      /**
       * Checks if `path` exists on `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {Array|string} path The path to check.
       * @param {Function} hasFunc The function to check properties.
       * @returns {boolean} Returns `true` if `path` exists, else `false`.
       */
      function hasPath(object, path, hasFunc) {
        path = castPath(path, object);
  
        var index = -1,
            length = path.length,
            result = false;
  
        while (++index < length) {
          var key = toKey(path[index]);
          if (!(result = object != null && hasFunc(object, key))) {
            break;
          }
          object = object[key];
        }
        if (result || ++index != length) {
          return result;
        }
        length = object == null ? 0 : object.length;
        return !!length && isLength(length) && isIndex(key, length) &&
          (isArray(object) || isArguments(object));
      }
  
      /**
       * Initializes an array clone.
       *
       * @private
       * @param {Array} array The array to clone.
       * @returns {Array} Returns the initialized clone.
       */
      function initCloneArray(array) {
        var length = array.length,
            result = array.constructor(length);
  
        // Add properties assigned by `RegExp#exec`.
        if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
          result.index = array.index;
          result.input = array.input;
        }
        return result;
      }
  
      /**
       * Initializes an object clone.
       *
       * @private
       * @param {Object} object The object to clone.
       * @returns {Object} Returns the initialized clone.
       */
      function initCloneObject(object) {
        return (typeof object.constructor == 'function' && !isPrototype(object))
          ? baseCreate(getPrototype(object))
          : {};
      }
  
      /**
       * Initializes an object clone based on its `toStringTag`.
       *
       * **Note:** This function only supports cloning values with tags of
       * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
       *
       * @private
       * @param {Object} object The object to clone.
       * @param {string} tag The `toStringTag` of the object to clone.
       * @param {Function} cloneFunc The function to clone values.
       * @param {boolean} [isDeep] Specify a deep clone.
       * @returns {Object} Returns the initialized clone.
       */
      function initCloneByTag(object, tag, cloneFunc, isDeep) {
        var Ctor = object.constructor;
        switch (tag) {
          case arrayBufferTag:
            return cloneArrayBuffer(object);
  
          case boolTag:
          case dateTag:
            return new Ctor(+object);
  
          case dataViewTag:
            return cloneDataView(object, isDeep);
  
          case float32Tag: case float64Tag:
          case int8Tag: case int16Tag: case int32Tag:
          case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
            return cloneTypedArray(object, isDeep);
  
          case mapTag:
            return cloneMap(object, isDeep, cloneFunc);
  
          case numberTag:
          case stringTag:
            return new Ctor(object);
  
          case regexpTag:
            return cloneRegExp(object);
  
          case setTag:
            return cloneSet(object, isDeep, cloneFunc);
  
          case symbolTag:
            return cloneSymbol(object);
        }
      }
  
      /**
       * Inserts wrapper `details` in a comment at the top of the `source` body.
       *
       * @private
       * @param {string} source The source to modify.
       * @returns {Array} details The details to insert.
       * @returns {string} Returns the modified source.
       */
      function insertWrapDetails(source, details) {
        var length = details.length;
        if (!length) {
          return source;
        }
        var lastIndex = length - 1;
        details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
        details = details.join(length > 2 ? ', ' : ' ');
        return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
      }
  
      /**
       * Checks if `value` is a flattenable `arguments` object or array.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
       */
      function isFlattenable(value) {
        return isArray(value) || isArguments(value) ||
          !!(spreadableSymbol && value && value[spreadableSymbol]);
      }
  
      /**
       * Checks if `value` is a valid array-like index.
       *
       * @private
       * @param {*} value The value to check.
       * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
       * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
       */
      function isIndex(value, length) {
        length = length == null ? MAX_SAFE_INTEGER : length;
        return !!length &&
          (typeof value == 'number' || reIsUint.test(value)) &&
          (value > -1 && value % 1 == 0 && value < length);
      }
  
      /**
       * Checks if the given arguments are from an iteratee call.
       *
       * @private
       * @param {*} value The potential iteratee value argument.
       * @param {*} index The potential iteratee index or key argument.
       * @param {*} object The potential iteratee object argument.
       * @returns {boolean} Returns `true` if the arguments are from an iteratee call,
       *  else `false`.
       */
      function isIterateeCall(value, index, object) {
        if (!isObject(object)) {
          return false;
        }
        var type = typeof index;
        if (type == 'number'
              ? (isArrayLike(object) && isIndex(index, object.length))
              : (type == 'string' && index in object)
            ) {
          return eq(object[index], value);
        }
        return false;
      }
  
      /**
       * Checks if `value` is a property name and not a property path.
       *
       * @private
       * @param {*} value The value to check.
       * @param {Object} [object] The object to query keys on.
       * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
       */
      function isKey(value, object) {
        if (isArray(value)) {
          return false;
        }
        var type = typeof value;
        if (type == 'number' || type == 'symbol' || type == 'boolean' ||
            value == null || isSymbol(value)) {
          return true;
        }
        return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
          (object != null && value in Object(object));
      }
  
      /**
       * Checks if `value` is suitable for use as unique object key.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
       */
      function isKeyable(value) {
        var type = typeof value;
        return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
          ? (value !== '__proto__')
          : (value === null);
      }
  
      /**
       * Checks if `func` has a lazy counterpart.
       *
       * @private
       * @param {Function} func The function to check.
       * @returns {boolean} Returns `true` if `func` has a lazy counterpart,
       *  else `false`.
       */
      function isLaziable(func) {
        var funcName = getFuncName(func),
            other = lodash[funcName];
  
        if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) {
          return false;
        }
        if (func === other) {
          return true;
        }
        var data = getData(other);
        return !!data && func === data[0];
      }
  
      /**
       * Checks if `func` has its source masked.
       *
       * @private
       * @param {Function} func The function to check.
       * @returns {boolean} Returns `true` if `func` is masked, else `false`.
       */
      function isMasked(func) {
        return !!maskSrcKey && (maskSrcKey in func);
      }
  
      /**
       * Checks if `func` is capable of being masked.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `func` is maskable, else `false`.
       */
      var isMaskable = coreJsData ? isFunction : stubFalse;
  
      /**
       * Checks if `value` is likely a prototype object.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
       */
      function isPrototype(value) {
        var Ctor = value && value.constructor,
            proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;
  
        return value === proto;
      }
  
      /**
       * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` if suitable for strict
       *  equality comparisons, else `false`.
       */
      function isStrictComparable(value) {
        return value === value && !isObject(value);
      }
  
      /**
       * A specialized version of `matchesProperty` for source values suitable
       * for strict equality comparisons, i.e. `===`.
       *
       * @private
       * @param {string} key The key of the property to get.
       * @param {*} srcValue The value to match.
       * @returns {Function} Returns the new spec function.
       */
      function matchesStrictComparable(key, srcValue) {
        return function(object) {
          if (object == null) {
            return false;
          }
          return object[key] === srcValue &&
            (srcValue !== undefined || (key in Object(object)));
        };
      }
  
      /**
       * A specialized version of `_.memoize` which clears the memoized function's
       * cache when it exceeds `MAX_MEMOIZE_SIZE`.
       *
       * @private
       * @param {Function} func The function to have its output memoized.
       * @returns {Function} Returns the new memoized function.
       */
      function memoizeCapped(func) {
        var result = memoize(func, function(key) {
          if (cache.size === MAX_MEMOIZE_SIZE) {
            cache.clear();
          }
          return key;
        });
  
        var cache = result.cache;
        return result;
      }
  
      /**
       * Merges the function metadata of `source` into `data`.
       *
       * Merging metadata reduces the number of wrappers used to invoke a function.
       * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
       * may be applied regardless of execution order. Methods like `_.ary` and
       * `_.rearg` modify function arguments, making the order in which they are
       * executed important, preventing the merging of metadata. However, we make
       * an exception for a safe combined case where curried functions have `_.ary`
       * and or `_.rearg` applied.
       *
       * @private
       * @param {Array} data The destination metadata.
       * @param {Array} source The source metadata.
       * @returns {Array} Returns `data`.
       */
      function mergeData(data, source) {
        var bitmask = data[1],
            srcBitmask = source[1],
            newBitmask = bitmask | srcBitmask,
            isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);
  
        var isCombo =
          ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
          ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
          ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));
  
        // Exit early if metadata can't be merged.
        if (!(isCommon || isCombo)) {
          return data;
        }
        // Use source `thisArg` if available.
        if (srcBitmask & WRAP_BIND_FLAG) {
          data[2] = source[2];
          // Set when currying a bound function.
          newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
        }
        // Compose partial arguments.
        var value = source[3];
        if (value) {
          var partials = data[3];
          data[3] = partials ? composeArgs(partials, value, source[4]) : value;
          data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
        }
        // Compose partial right arguments.
        value = source[5];
        if (value) {
          partials = data[5];
          data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
          data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
        }
        // Use source `argPos` if available.
        value = source[7];
        if (value) {
          data[7] = value;
        }
        // Use source `ary` if it's smaller.
        if (srcBitmask & WRAP_ARY_FLAG) {
          data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
        }
        // Use source `arity` if one is not provided.
        if (data[9] == null) {
          data[9] = source[9];
        }
        // Use source `func` and merge bitmasks.
        data[0] = source[0];
        data[1] = newBitmask;
  
        return data;
      }
  
      /**
       * This function is like
       * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
       * except that it includes inherited enumerable properties.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names.
       */
      function nativeKeysIn(object) {
        var result = [];
        if (object != null) {
          for (var key in Object(object)) {
            result.push(key);
          }
        }
        return result;
      }
  
      /**
       * Converts `value` to a string using `Object.prototype.toString`.
       *
       * @private
       * @param {*} value The value to convert.
       * @returns {string} Returns the converted string.
       */
      function objectToString(value) {
        return nativeObjectToString.call(value);
      }
  
      /**
       * A specialized version of `baseRest` which transforms the rest array.
       *
       * @private
       * @param {Function} func The function to apply a rest parameter to.
       * @param {number} [start=func.length-1] The start position of the rest parameter.
       * @param {Function} transform The rest array transform.
       * @returns {Function} Returns the new function.
       */
      function overRest(func, start, transform) {
        start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
        return function() {
          var args = arguments,
              index = -1,
              length = nativeMax(args.length - start, 0),
              array = Array(length);
  
          while (++index < length) {
            array[index] = args[start + index];
          }
          index = -1;
          var otherArgs = Array(start + 1);
          while (++index < start) {
            otherArgs[index] = args[index];
          }
          otherArgs[start] = transform(array);
          return apply(func, this, otherArgs);
        };
      }
  
      /**
       * Gets the parent value at `path` of `object`.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {Array} path The path to get the parent value of.
       * @returns {*} Returns the parent value.
       */
      function parent(object, path) {
        return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1));
      }
  
      /**
       * Reorder `array` according to the specified indexes where the element at
       * the first index is assigned as the first element, the element at
       * the second index is assigned as the second element, and so on.
       *
       * @private
       * @param {Array} array The array to reorder.
       * @param {Array} indexes The arranged array indexes.
       * @returns {Array} Returns `array`.
       */
      function reorder(array, indexes) {
        var arrLength = array.length,
            length = nativeMin(indexes.length, arrLength),
            oldArray = copyArray(array);
  
        while (length--) {
          var index = indexes[length];
          array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;
        }
        return array;
      }
  
      /**
       * Sets metadata for `func`.
       *
       * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
       * period of time, it will trip its breaker and transition to an identity
       * function to avoid garbage collection pauses in V8. See
       * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070)
       * for more details.
       *
       * @private
       * @param {Function} func The function to associate metadata with.
       * @param {*} data The metadata.
       * @returns {Function} Returns `func`.
       */
      var setData = shortOut(baseSetData);
  
      /**
       * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout).
       *
       * @private
       * @param {Function} func The function to delay.
       * @param {number} wait The number of milliseconds to delay invocation.
       * @returns {number|Object} Returns the timer id or timeout object.
       */
      var setTimeout = ctxSetTimeout || function(func, wait) {
        return root.setTimeout(func, wait);
      };
  
      /**
       * Sets the `toString` method of `func` to return `string`.
       *
       * @private
       * @param {Function} func The function to modify.
       * @param {Function} string The `toString` result.
       * @returns {Function} Returns `func`.
       */
      var setToString = shortOut(baseSetToString);
  
      /**
       * Sets the `toString` method of `wrapper` to mimic the source of `reference`
       * with wrapper details in a comment at the top of the source body.
       *
       * @private
       * @param {Function} wrapper The function to modify.
       * @param {Function} reference The reference function.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @returns {Function} Returns `wrapper`.
       */
      function setWrapToString(wrapper, reference, bitmask) {
        var source = (reference + '');
        return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
      }
  
      /**
       * Creates a function that'll short out and invoke `identity` instead
       * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
       * milliseconds.
       *
       * @private
       * @param {Function} func The function to restrict.
       * @returns {Function} Returns the new shortable function.
       */
      function shortOut(func) {
        var count = 0,
            lastCalled = 0;
  
        return function() {
          var stamp = nativeNow(),
              remaining = HOT_SPAN - (stamp - lastCalled);
  
          lastCalled = stamp;
          if (remaining > 0) {
            if (++count >= HOT_COUNT) {
              return arguments[0];
            }
          } else {
            count = 0;
          }
          return func.apply(undefined, arguments);
        };
      }
  
      /**
       * A specialized version of `_.shuffle` which mutates and sets the size of `array`.
       *
       * @private
       * @param {Array} array The array to shuffle.
       * @param {number} [size=array.length] The size of `array`.
       * @returns {Array} Returns `array`.
       */
      function shuffleSelf(array, size) {
        var index = -1,
            length = array.length,
            lastIndex = length - 1;
  
        size = size === undefined ? length : size;
        while (++index < size) {
          var rand = baseRandom(index, lastIndex),
              value = array[rand];
  
          array[rand] = array[index];
          array[index] = value;
        }
        array.length = size;
        return array;
      }
  
      /**
       * Converts `string` to a property path array.
       *
       * @private
       * @param {string} string The string to convert.
       * @returns {Array} Returns the property path array.
       */
      var stringToPath = memoizeCapped(function(string) {
        var result = [];
        if (reLeadingDot.test(string)) {
          result.push('');
        }
        string.replace(rePropName, function(match, number, quote, string) {
          result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
        });
        return result;
      });
  
      /**
       * Converts `value` to a string key if it's not a string or symbol.
       *
       * @private
       * @param {*} value The value to inspect.
       * @returns {string|symbol} Returns the key.
       */
      function toKey(value) {
        if (typeof value == 'string' || isSymbol(value)) {
          return value;
        }
        var result = (value + '');
        return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
      }
  
      /**
       * Converts `func` to its source code.
       *
       * @private
       * @param {Function} func The function to convert.
       * @returns {string} Returns the source code.
       */
      function toSource(func) {
        if (func != null) {
          try {
            return funcToString.call(func);
          } catch (e) {}
          try {
            return (func + '');
          } catch (e) {}
        }
        return '';
      }
  
      /**
       * Updates wrapper `details` based on `bitmask` flags.
       *
       * @private
       * @returns {Array} details The details to modify.
       * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
       * @returns {Array} Returns `details`.
       */
      function updateWrapDetails(details, bitmask) {
        arrayEach(wrapFlags, function(pair) {
          var value = '_.' + pair[0];
          if ((bitmask & pair[1]) && !arrayIncludes(details, value)) {
            details.push(value);
          }
        });
        return details.sort();
      }
  
      /**
       * Creates a clone of `wrapper`.
       *
       * @private
       * @param {Object} wrapper The wrapper to clone.
       * @returns {Object} Returns the cloned wrapper.
       */
      function wrapperClone(wrapper) {
        if (wrapper instanceof LazyWrapper) {
          return wrapper.clone();
        }
        var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__);
        result.__actions__ = copyArray(wrapper.__actions__);
        result.__index__  = wrapper.__index__;
        result.__values__ = wrapper.__values__;
        return result;
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates an array of elements split into groups the length of `size`.
       * If `array` can't be split evenly, the final chunk will be the remaining
       * elements.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to process.
       * @param {number} [size=1] The length of each chunk
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the new array of chunks.
       * @example
       *
       * _.chunk(['a', 'b', 'c', 'd'], 2);
       * // => [['a', 'b'], ['c', 'd']]
       *
       * _.chunk(['a', 'b', 'c', 'd'], 3);
       * // => [['a', 'b', 'c'], ['d']]
       */
      function chunk(array, size, guard) {
        if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {
          size = 1;
        } else {
          size = nativeMax(toInteger(size), 0);
        }
        var length = array == null ? 0 : array.length;
        if (!length || size < 1) {
          return [];
        }
        var index = 0,
            resIndex = 0,
            result = Array(nativeCeil(length / size));
  
        while (index < length) {
          result[resIndex++] = baseSlice(array, index, (index += size));
        }
        return result;
      }
  
      /**
       * Creates an array with all falsey values removed. The values `false`, `null`,
       * `0`, `""`, `undefined`, and `NaN` are falsey.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to compact.
       * @returns {Array} Returns the new array of filtered values.
       * @example
       *
       * _.compact([0, 1, false, 2, '', 3]);
       * // => [1, 2, 3]
       */
      function compact(array) {
        var index = -1,
            length = array == null ? 0 : array.length,
            resIndex = 0,
            result = [];
  
        while (++index < length) {
          var value = array[index];
          if (value) {
            result[resIndex++] = value;
          }
        }
        return result;
      }
  
      /**
       * Creates a new array concatenating `array` with any additional arrays
       * and/or values.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to concatenate.
       * @param {...*} [values] The values to concatenate.
       * @returns {Array} Returns the new concatenated array.
       * @example
       *
       * var array = [1];
       * var other = _.concat(array, 2, [3], [[4]]);
       *
       * console.log(other);
       * // => [1, 2, 3, [4]]
       *
       * console.log(array);
       * // => [1]
       */
      function concat() {
        var length = arguments.length;
        if (!length) {
          return [];
        }
        var args = Array(length - 1),
            array = arguments[0],
            index = length;
  
        while (index--) {
          args[index - 1] = arguments[index];
        }
        return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
      }
  
      /**
       * Creates an array of `array` values not included in the other given arrays
       * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons. The order and references of result values are
       * determined by the first array.
       *
       * **Note:** Unlike `_.pullAll`, this method returns a new array.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {...Array} [values] The values to exclude.
       * @returns {Array} Returns the new array of filtered values.
       * @see _.without, _.xor
       * @example
       *
       * _.difference([2, 1], [2, 3]);
       * // => [1]
       */
      var difference = baseRest(function(array, values) {
        return isArrayLikeObject(array)
          ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
          : [];
      });
  
      /**
       * This method is like `_.difference` except that it accepts `iteratee` which
       * is invoked for each element of `array` and `values` to generate the criterion
       * by which they're compared. The order and references of result values are
       * determined by the first array. The iteratee is invoked with one argument:
       * (value).
       *
       * **Note:** Unlike `_.pullAllBy`, this method returns a new array.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {...Array} [values] The values to exclude.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Array} Returns the new array of filtered values.
       * @example
       *
       * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
       * // => [1.2]
       *
       * // The `_.property` iteratee shorthand.
       * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
       * // => [{ 'x': 2 }]
       */
      var differenceBy = baseRest(function(array, values) {
        var iteratee = last(values);
        if (isArrayLikeObject(iteratee)) {
          iteratee = undefined;
        }
        return isArrayLikeObject(array)
          ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2))
          : [];
      });
  
      /**
       * This method is like `_.difference` except that it accepts `comparator`
       * which is invoked to compare elements of `array` to `values`. The order and
       * references of result values are determined by the first array. The comparator
       * is invoked with two arguments: (arrVal, othVal).
       *
       * **Note:** Unlike `_.pullAllWith`, this method returns a new array.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {...Array} [values] The values to exclude.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of filtered values.
       * @example
       *
       * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
       *
       * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
       * // => [{ 'x': 2, 'y': 1 }]
       */
      var differenceWith = baseRest(function(array, values) {
        var comparator = last(values);
        if (isArrayLikeObject(comparator)) {
          comparator = undefined;
        }
        return isArrayLikeObject(array)
          ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)
          : [];
      });
  
      /**
       * Creates a slice of `array` with `n` elements dropped from the beginning.
       *
       * @static
       * @memberOf _
       * @since 0.5.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {number} [n=1] The number of elements to drop.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * _.drop([1, 2, 3]);
       * // => [2, 3]
       *
       * _.drop([1, 2, 3], 2);
       * // => [3]
       *
       * _.drop([1, 2, 3], 5);
       * // => []
       *
       * _.drop([1, 2, 3], 0);
       * // => [1, 2, 3]
       */
      function drop(array, n, guard) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return [];
        }
        n = (guard || n === undefined) ? 1 : toInteger(n);
        return baseSlice(array, n < 0 ? 0 : n, length);
      }
  
      /**
       * Creates a slice of `array` with `n` elements dropped from the end.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {number} [n=1] The number of elements to drop.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * _.dropRight([1, 2, 3]);
       * // => [1, 2]
       *
       * _.dropRight([1, 2, 3], 2);
       * // => [1]
       *
       * _.dropRight([1, 2, 3], 5);
       * // => []
       *
       * _.dropRight([1, 2, 3], 0);
       * // => [1, 2, 3]
       */
      function dropRight(array, n, guard) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return [];
        }
        n = (guard || n === undefined) ? 1 : toInteger(n);
        n = length - n;
        return baseSlice(array, 0, n < 0 ? 0 : n);
      }
  
      /**
       * Creates a slice of `array` excluding elements dropped from the end.
       * Elements are dropped until `predicate` returns falsey. The predicate is
       * invoked with three arguments: (value, index, array).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'active': true },
       *   { 'user': 'fred',    'active': false },
       *   { 'user': 'pebbles', 'active': false }
       * ];
       *
       * _.dropRightWhile(users, function(o) { return !o.active; });
       * // => objects for ['barney']
       *
       * // The `_.matches` iteratee shorthand.
       * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
       * // => objects for ['barney', 'fred']
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.dropRightWhile(users, ['active', false]);
       * // => objects for ['barney']
       *
       * // The `_.property` iteratee shorthand.
       * _.dropRightWhile(users, 'active');
       * // => objects for ['barney', 'fred', 'pebbles']
       */
      function dropRightWhile(array, predicate) {
        return (array && array.length)
          ? baseWhile(array, getIteratee(predicate, 3), true, true)
          : [];
      }
  
      /**
       * Creates a slice of `array` excluding elements dropped from the beginning.
       * Elements are dropped until `predicate` returns falsey. The predicate is
       * invoked with three arguments: (value, index, array).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'active': false },
       *   { 'user': 'fred',    'active': false },
       *   { 'user': 'pebbles', 'active': true }
       * ];
       *
       * _.dropWhile(users, function(o) { return !o.active; });
       * // => objects for ['pebbles']
       *
       * // The `_.matches` iteratee shorthand.
       * _.dropWhile(users, { 'user': 'barney', 'active': false });
       * // => objects for ['fred', 'pebbles']
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.dropWhile(users, ['active', false]);
       * // => objects for ['pebbles']
       *
       * // The `_.property` iteratee shorthand.
       * _.dropWhile(users, 'active');
       * // => objects for ['barney', 'fred', 'pebbles']
       */
      function dropWhile(array, predicate) {
        return (array && array.length)
          ? baseWhile(array, getIteratee(predicate, 3), true)
          : [];
      }
  
      /**
       * Fills elements of `array` with `value` from `start` up to, but not
       * including, `end`.
       *
       * **Note:** This method mutates `array`.
       *
       * @static
       * @memberOf _
       * @since 3.2.0
       * @category Array
       * @param {Array} array The array to fill.
       * @param {*} value The value to fill `array` with.
       * @param {number} [start=0] The start position.
       * @param {number} [end=array.length] The end position.
       * @returns {Array} Returns `array`.
       * @example
       *
       * var array = [1, 2, 3];
       *
       * _.fill(array, 'a');
       * console.log(array);
       * // => ['a', 'a', 'a']
       *
       * _.fill(Array(3), 2);
       * // => [2, 2, 2]
       *
       * _.fill([4, 6, 8, 10], '*', 1, 3);
       * // => [4, '*', '*', 10]
       */
      function fill(array, value, start, end) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return [];
        }
        if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
          start = 0;
          end = length;
        }
        return baseFill(array, value, start, end);
      }
  
      /**
       * This method is like `_.find` except that it returns the index of the first
       * element `predicate` returns truthy for instead of the element itself.
       *
       * @static
       * @memberOf _
       * @since 1.1.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @param {number} [fromIndex=0] The index to search from.
       * @returns {number} Returns the index of the found element, else `-1`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'active': false },
       *   { 'user': 'fred',    'active': false },
       *   { 'user': 'pebbles', 'active': true }
       * ];
       *
       * _.findIndex(users, function(o) { return o.user == 'barney'; });
       * // => 0
       *
       * // The `_.matches` iteratee shorthand.
       * _.findIndex(users, { 'user': 'fred', 'active': false });
       * // => 1
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.findIndex(users, ['active', false]);
       * // => 0
       *
       * // The `_.property` iteratee shorthand.
       * _.findIndex(users, 'active');
       * // => 2
       */
      function findIndex(array, predicate, fromIndex) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return -1;
        }
        var index = fromIndex == null ? 0 : toInteger(fromIndex);
        if (index < 0) {
          index = nativeMax(length + index, 0);
        }
        return baseFindIndex(array, getIteratee(predicate, 3), index);
      }
  
      /**
       * This method is like `_.findIndex` except that it iterates over elements
       * of `collection` from right to left.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @param {number} [fromIndex=array.length-1] The index to search from.
       * @returns {number} Returns the index of the found element, else `-1`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'active': true },
       *   { 'user': 'fred',    'active': false },
       *   { 'user': 'pebbles', 'active': false }
       * ];
       *
       * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
       * // => 2
       *
       * // The `_.matches` iteratee shorthand.
       * _.findLastIndex(users, { 'user': 'barney', 'active': true });
       * // => 0
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.findLastIndex(users, ['active', false]);
       * // => 2
       *
       * // The `_.property` iteratee shorthand.
       * _.findLastIndex(users, 'active');
       * // => 0
       */
      function findLastIndex(array, predicate, fromIndex) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return -1;
        }
        var index = length - 1;
        if (fromIndex !== undefined) {
          index = toInteger(fromIndex);
          index = fromIndex < 0
            ? nativeMax(length + index, 0)
            : nativeMin(index, length - 1);
        }
        return baseFindIndex(array, getIteratee(predicate, 3), index, true);
      }
  
      /**
       * Flattens `array` a single level deep.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to flatten.
       * @returns {Array} Returns the new flattened array.
       * @example
       *
       * _.flatten([1, [2, [3, [4]], 5]]);
       * // => [1, 2, [3, [4]], 5]
       */
      function flatten(array) {
        var length = array == null ? 0 : array.length;
        return length ? baseFlatten(array, 1) : [];
      }
  
      /**
       * Recursively flattens `array`.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to flatten.
       * @returns {Array} Returns the new flattened array.
       * @example
       *
       * _.flattenDeep([1, [2, [3, [4]], 5]]);
       * // => [1, 2, 3, 4, 5]
       */
      function flattenDeep(array) {
        var length = array == null ? 0 : array.length;
        return length ? baseFlatten(array, INFINITY) : [];
      }
  
      /**
       * Recursively flatten `array` up to `depth` times.
       *
       * @static
       * @memberOf _
       * @since 4.4.0
       * @category Array
       * @param {Array} array The array to flatten.
       * @param {number} [depth=1] The maximum recursion depth.
       * @returns {Array} Returns the new flattened array.
       * @example
       *
       * var array = [1, [2, [3, [4]], 5]];
       *
       * _.flattenDepth(array, 1);
       * // => [1, 2, [3, [4]], 5]
       *
       * _.flattenDepth(array, 2);
       * // => [1, 2, 3, [4], 5]
       */
      function flattenDepth(array, depth) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return [];
        }
        depth = depth === undefined ? 1 : toInteger(depth);
        return baseFlatten(array, depth);
      }
  
      /**
       * The inverse of `_.toPairs`; this method returns an object composed
       * from key-value `pairs`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} pairs The key-value pairs.
       * @returns {Object} Returns the new object.
       * @example
       *
       * _.fromPairs([['a', 1], ['b', 2]]);
       * // => { 'a': 1, 'b': 2 }
       */
      function fromPairs(pairs) {
        var index = -1,
            length = pairs == null ? 0 : pairs.length,
            result = {};
  
        while (++index < length) {
          var pair = pairs[index];
          result[pair[0]] = pair[1];
        }
        return result;
      }
  
      /**
       * Gets the first element of `array`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @alias first
       * @category Array
       * @param {Array} array The array to query.
       * @returns {*} Returns the first element of `array`.
       * @example
       *
       * _.head([1, 2, 3]);
       * // => 1
       *
       * _.head([]);
       * // => undefined
       */
      function head(array) {
        return (array && array.length) ? array[0] : undefined;
      }
  
      /**
       * Gets the index at which the first occurrence of `value` is found in `array`
       * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons. If `fromIndex` is negative, it's used as the
       * offset from the end of `array`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {*} value The value to search for.
       * @param {number} [fromIndex=0] The index to search from.
       * @returns {number} Returns the index of the matched value, else `-1`.
       * @example
       *
       * _.indexOf([1, 2, 1, 2], 2);
       * // => 1
       *
       * // Search from the `fromIndex`.
       * _.indexOf([1, 2, 1, 2], 2, 2);
       * // => 3
       */
      function indexOf(array, value, fromIndex) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return -1;
        }
        var index = fromIndex == null ? 0 : toInteger(fromIndex);
        if (index < 0) {
          index = nativeMax(length + index, 0);
        }
        return baseIndexOf(array, value, index);
      }
  
      /**
       * Gets all but the last element of `array`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to query.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * _.initial([1, 2, 3]);
       * // => [1, 2]
       */
      function initial(array) {
        var length = array == null ? 0 : array.length;
        return length ? baseSlice(array, 0, -1) : [];
      }
  
      /**
       * Creates an array of unique values that are included in all given arrays
       * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons. The order and references of result values are
       * determined by the first array.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @returns {Array} Returns the new array of intersecting values.
       * @example
       *
       * _.intersection([2, 1], [2, 3]);
       * // => [2]
       */
      var intersection = baseRest(function(arrays) {
        var mapped = arrayMap(arrays, castArrayLikeObject);
        return (mapped.length && mapped[0] === arrays[0])
          ? baseIntersection(mapped)
          : [];
      });
  
      /**
       * This method is like `_.intersection` except that it accepts `iteratee`
       * which is invoked for each element of each `arrays` to generate the criterion
       * by which they're compared. The order and references of result values are
       * determined by the first array. The iteratee is invoked with one argument:
       * (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Array} Returns the new array of intersecting values.
       * @example
       *
       * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
       * // => [2.1]
       *
       * // The `_.property` iteratee shorthand.
       * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
       * // => [{ 'x': 1 }]
       */
      var intersectionBy = baseRest(function(arrays) {
        var iteratee = last(arrays),
            mapped = arrayMap(arrays, castArrayLikeObject);
  
        if (iteratee === last(mapped)) {
          iteratee = undefined;
        } else {
          mapped.pop();
        }
        return (mapped.length && mapped[0] === arrays[0])
          ? baseIntersection(mapped, getIteratee(iteratee, 2))
          : [];
      });
  
      /**
       * This method is like `_.intersection` except that it accepts `comparator`
       * which is invoked to compare elements of `arrays`. The order and references
       * of result values are determined by the first array. The comparator is
       * invoked with two arguments: (arrVal, othVal).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of intersecting values.
       * @example
       *
       * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
       * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
       *
       * _.intersectionWith(objects, others, _.isEqual);
       * // => [{ 'x': 1, 'y': 2 }]
       */
      var intersectionWith = baseRest(function(arrays) {
        var comparator = last(arrays),
            mapped = arrayMap(arrays, castArrayLikeObject);
  
        comparator = typeof comparator == 'function' ? comparator : undefined;
        if (comparator) {
          mapped.pop();
        }
        return (mapped.length && mapped[0] === arrays[0])
          ? baseIntersection(mapped, undefined, comparator)
          : [];
      });
  
      /**
       * Converts all elements in `array` into a string separated by `separator`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to convert.
       * @param {string} [separator=','] The element separator.
       * @returns {string} Returns the joined string.
       * @example
       *
       * _.join(['a', 'b', 'c'], '~');
       * // => 'a~b~c'
       */
      function join(array, separator) {
        return array == null ? '' : nativeJoin.call(array, separator);
      }
  
      /**
       * Gets the last element of `array`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to query.
       * @returns {*} Returns the last element of `array`.
       * @example
       *
       * _.last([1, 2, 3]);
       * // => 3
       */
      function last(array) {
        var length = array == null ? 0 : array.length;
        return length ? array[length - 1] : undefined;
      }
  
      /**
       * This method is like `_.indexOf` except that it iterates over elements of
       * `array` from right to left.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {*} value The value to search for.
       * @param {number} [fromIndex=array.length-1] The index to search from.
       * @returns {number} Returns the index of the matched value, else `-1`.
       * @example
       *
       * _.lastIndexOf([1, 2, 1, 2], 2);
       * // => 3
       *
       * // Search from the `fromIndex`.
       * _.lastIndexOf([1, 2, 1, 2], 2, 2);
       * // => 1
       */
      function lastIndexOf(array, value, fromIndex) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return -1;
        }
        var index = length;
        if (fromIndex !== undefined) {
          index = toInteger(fromIndex);
          index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);
        }
        return value === value
          ? strictLastIndexOf(array, value, index)
          : baseFindIndex(array, baseIsNaN, index, true);
      }
  
      /**
       * Gets the element at index `n` of `array`. If `n` is negative, the nth
       * element from the end is returned.
       *
       * @static
       * @memberOf _
       * @since 4.11.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {number} [n=0] The index of the element to return.
       * @returns {*} Returns the nth element of `array`.
       * @example
       *
       * var array = ['a', 'b', 'c', 'd'];
       *
       * _.nth(array, 1);
       * // => 'b'
       *
       * _.nth(array, -2);
       * // => 'c';
       */
      function nth(array, n) {
        return (array && array.length) ? baseNth(array, toInteger(n)) : undefined;
      }
  
      /**
       * Removes all given values from `array` using
       * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons.
       *
       * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
       * to remove elements from an array by predicate.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Array
       * @param {Array} array The array to modify.
       * @param {...*} [values] The values to remove.
       * @returns {Array} Returns `array`.
       * @example
       *
       * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
       *
       * _.pull(array, 'a', 'c');
       * console.log(array);
       * // => ['b', 'b']
       */
      var pull = baseRest(pullAll);
  
      /**
       * This method is like `_.pull` except that it accepts an array of values to remove.
       *
       * **Note:** Unlike `_.difference`, this method mutates `array`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to modify.
       * @param {Array} values The values to remove.
       * @returns {Array} Returns `array`.
       * @example
       *
       * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
       *
       * _.pullAll(array, ['a', 'c']);
       * console.log(array);
       * // => ['b', 'b']
       */
      function pullAll(array, values) {
        return (array && array.length && values && values.length)
          ? basePullAll(array, values)
          : array;
      }
  
      /**
       * This method is like `_.pullAll` except that it accepts `iteratee` which is
       * invoked for each element of `array` and `values` to generate the criterion
       * by which they're compared. The iteratee is invoked with one argument: (value).
       *
       * **Note:** Unlike `_.differenceBy`, this method mutates `array`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to modify.
       * @param {Array} values The values to remove.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Array} Returns `array`.
       * @example
       *
       * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];
       *
       * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');
       * console.log(array);
       * // => [{ 'x': 2 }]
       */
      function pullAllBy(array, values, iteratee) {
        return (array && array.length && values && values.length)
          ? basePullAll(array, values, getIteratee(iteratee, 2))
          : array;
      }
  
      /**
       * This method is like `_.pullAll` except that it accepts `comparator` which
       * is invoked to compare elements of `array` to `values`. The comparator is
       * invoked with two arguments: (arrVal, othVal).
       *
       * **Note:** Unlike `_.differenceWith`, this method mutates `array`.
       *
       * @static
       * @memberOf _
       * @since 4.6.0
       * @category Array
       * @param {Array} array The array to modify.
       * @param {Array} values The values to remove.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns `array`.
       * @example
       *
       * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];
       *
       * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);
       * console.log(array);
       * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]
       */
      function pullAllWith(array, values, comparator) {
        return (array && array.length && values && values.length)
          ? basePullAll(array, values, undefined, comparator)
          : array;
      }
  
      /**
       * Removes elements from `array` corresponding to `indexes` and returns an
       * array of removed elements.
       *
       * **Note:** Unlike `_.at`, this method mutates `array`.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to modify.
       * @param {...(number|number[])} [indexes] The indexes of elements to remove.
       * @returns {Array} Returns the new array of removed elements.
       * @example
       *
       * var array = ['a', 'b', 'c', 'd'];
       * var pulled = _.pullAt(array, [1, 3]);
       *
       * console.log(array);
       * // => ['a', 'c']
       *
       * console.log(pulled);
       * // => ['b', 'd']
       */
      var pullAt = flatRest(function(array, indexes) {
        var length = array == null ? 0 : array.length,
            result = baseAt(array, indexes);
  
        basePullAt(array, arrayMap(indexes, function(index) {
          return isIndex(index, length) ? +index : index;
        }).sort(compareAscending));
  
        return result;
      });
  
      /**
       * Removes all elements from `array` that `predicate` returns truthy for
       * and returns an array of the removed elements. The predicate is invoked
       * with three arguments: (value, index, array).
       *
       * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`
       * to pull elements from an array by value.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Array
       * @param {Array} array The array to modify.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the new array of removed elements.
       * @example
       *
       * var array = [1, 2, 3, 4];
       * var evens = _.remove(array, function(n) {
       *   return n % 2 == 0;
       * });
       *
       * console.log(array);
       * // => [1, 3]
       *
       * console.log(evens);
       * // => [2, 4]
       */
      function remove(array, predicate) {
        var result = [];
        if (!(array && array.length)) {
          return result;
        }
        var index = -1,
            indexes = [],
            length = array.length;
  
        predicate = getIteratee(predicate, 3);
        while (++index < length) {
          var value = array[index];
          if (predicate(value, index, array)) {
            result.push(value);
            indexes.push(index);
          }
        }
        basePullAt(array, indexes);
        return result;
      }
  
      /**
       * Reverses `array` so that the first element becomes the last, the second
       * element becomes the second to last, and so on.
       *
       * **Note:** This method mutates `array` and is based on
       * [`Array#reverse`](https://mdn.io/Array/reverse).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to modify.
       * @returns {Array} Returns `array`.
       * @example
       *
       * var array = [1, 2, 3];
       *
       * _.reverse(array);
       * // => [3, 2, 1]
       *
       * console.log(array);
       * // => [3, 2, 1]
       */
      function reverse(array) {
        return array == null ? array : nativeReverse.call(array);
      }
  
      /**
       * Creates a slice of `array` from `start` up to, but not including, `end`.
       *
       * **Note:** This method is used instead of
       * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are
       * returned.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to slice.
       * @param {number} [start=0] The start position.
       * @param {number} [end=array.length] The end position.
       * @returns {Array} Returns the slice of `array`.
       */
      function slice(array, start, end) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return [];
        }
        if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {
          start = 0;
          end = length;
        }
        else {
          start = start == null ? 0 : toInteger(start);
          end = end === undefined ? length : toInteger(end);
        }
        return baseSlice(array, start, end);
      }
  
      /**
       * Uses a binary search to determine the lowest index at which `value`
       * should be inserted into `array` in order to maintain its sort order.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The sorted array to inspect.
       * @param {*} value The value to evaluate.
       * @returns {number} Returns the index at which `value` should be inserted
       *  into `array`.
       * @example
       *
       * _.sortedIndex([30, 50], 40);
       * // => 1
       */
      function sortedIndex(array, value) {
        return baseSortedIndex(array, value);
      }
  
      /**
       * This method is like `_.sortedIndex` except that it accepts `iteratee`
       * which is invoked for `value` and each element of `array` to compute their
       * sort ranking. The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The sorted array to inspect.
       * @param {*} value The value to evaluate.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {number} Returns the index at which `value` should be inserted
       *  into `array`.
       * @example
       *
       * var objects = [{ 'x': 4 }, { 'x': 5 }];
       *
       * _.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
       * // => 0
       *
       * // The `_.property` iteratee shorthand.
       * _.sortedIndexBy(objects, { 'x': 4 }, 'x');
       * // => 0
       */
      function sortedIndexBy(array, value, iteratee) {
        return baseSortedIndexBy(array, value, getIteratee(iteratee, 2));
      }
  
      /**
       * This method is like `_.indexOf` except that it performs a binary
       * search on a sorted `array`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {*} value The value to search for.
       * @returns {number} Returns the index of the matched value, else `-1`.
       * @example
       *
       * _.sortedIndexOf([4, 5, 5, 5, 6], 5);
       * // => 1
       */
      function sortedIndexOf(array, value) {
        var length = array == null ? 0 : array.length;
        if (length) {
          var index = baseSortedIndex(array, value);
          if (index < length && eq(array[index], value)) {
            return index;
          }
        }
        return -1;
      }
  
      /**
       * This method is like `_.sortedIndex` except that it returns the highest
       * index at which `value` should be inserted into `array` in order to
       * maintain its sort order.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The sorted array to inspect.
       * @param {*} value The value to evaluate.
       * @returns {number} Returns the index at which `value` should be inserted
       *  into `array`.
       * @example
       *
       * _.sortedLastIndex([4, 5, 5, 5, 6], 5);
       * // => 4
       */
      function sortedLastIndex(array, value) {
        return baseSortedIndex(array, value, true);
      }
  
      /**
       * This method is like `_.sortedLastIndex` except that it accepts `iteratee`
       * which is invoked for `value` and each element of `array` to compute their
       * sort ranking. The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The sorted array to inspect.
       * @param {*} value The value to evaluate.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {number} Returns the index at which `value` should be inserted
       *  into `array`.
       * @example
       *
       * var objects = [{ 'x': 4 }, { 'x': 5 }];
       *
       * _.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
       * // => 1
       *
       * // The `_.property` iteratee shorthand.
       * _.sortedLastIndexBy(objects, { 'x': 4 }, 'x');
       * // => 1
       */
      function sortedLastIndexBy(array, value, iteratee) {
        return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true);
      }
  
      /**
       * This method is like `_.lastIndexOf` except that it performs a binary
       * search on a sorted `array`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {*} value The value to search for.
       * @returns {number} Returns the index of the matched value, else `-1`.
       * @example
       *
       * _.sortedLastIndexOf([4, 5, 5, 5, 6], 5);
       * // => 3
       */
      function sortedLastIndexOf(array, value) {
        var length = array == null ? 0 : array.length;
        if (length) {
          var index = baseSortedIndex(array, value, true) - 1;
          if (eq(array[index], value)) {
            return index;
          }
        }
        return -1;
      }
  
      /**
       * This method is like `_.uniq` except that it's designed and optimized
       * for sorted arrays.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @returns {Array} Returns the new duplicate free array.
       * @example
       *
       * _.sortedUniq([1, 1, 2]);
       * // => [1, 2]
       */
      function sortedUniq(array) {
        return (array && array.length)
          ? baseSortedUniq(array)
          : [];
      }
  
      /**
       * This method is like `_.uniqBy` except that it's designed and optimized
       * for sorted arrays.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {Function} [iteratee] The iteratee invoked per element.
       * @returns {Array} Returns the new duplicate free array.
       * @example
       *
       * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
       * // => [1.1, 2.3]
       */
      function sortedUniqBy(array, iteratee) {
        return (array && array.length)
          ? baseSortedUniq(array, getIteratee(iteratee, 2))
          : [];
      }
  
      /**
       * Gets all but the first element of `array`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * _.tail([1, 2, 3]);
       * // => [2, 3]
       */
      function tail(array) {
        var length = array == null ? 0 : array.length;
        return length ? baseSlice(array, 1, length) : [];
      }
  
      /**
       * Creates a slice of `array` with `n` elements taken from the beginning.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {number} [n=1] The number of elements to take.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * _.take([1, 2, 3]);
       * // => [1]
       *
       * _.take([1, 2, 3], 2);
       * // => [1, 2]
       *
       * _.take([1, 2, 3], 5);
       * // => [1, 2, 3]
       *
       * _.take([1, 2, 3], 0);
       * // => []
       */
      function take(array, n, guard) {
        if (!(array && array.length)) {
          return [];
        }
        n = (guard || n === undefined) ? 1 : toInteger(n);
        return baseSlice(array, 0, n < 0 ? 0 : n);
      }
  
      /**
       * Creates a slice of `array` with `n` elements taken from the end.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {number} [n=1] The number of elements to take.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * _.takeRight([1, 2, 3]);
       * // => [3]
       *
       * _.takeRight([1, 2, 3], 2);
       * // => [2, 3]
       *
       * _.takeRight([1, 2, 3], 5);
       * // => [1, 2, 3]
       *
       * _.takeRight([1, 2, 3], 0);
       * // => []
       */
      function takeRight(array, n, guard) {
        var length = array == null ? 0 : array.length;
        if (!length) {
          return [];
        }
        n = (guard || n === undefined) ? 1 : toInteger(n);
        n = length - n;
        return baseSlice(array, n < 0 ? 0 : n, length);
      }
  
      /**
       * Creates a slice of `array` with elements taken from the end. Elements are
       * taken until `predicate` returns falsey. The predicate is invoked with
       * three arguments: (value, index, array).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'active': true },
       *   { 'user': 'fred',    'active': false },
       *   { 'user': 'pebbles', 'active': false }
       * ];
       *
       * _.takeRightWhile(users, function(o) { return !o.active; });
       * // => objects for ['fred', 'pebbles']
       *
       * // The `_.matches` iteratee shorthand.
       * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
       * // => objects for ['pebbles']
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.takeRightWhile(users, ['active', false]);
       * // => objects for ['fred', 'pebbles']
       *
       * // The `_.property` iteratee shorthand.
       * _.takeRightWhile(users, 'active');
       * // => []
       */
      function takeRightWhile(array, predicate) {
        return (array && array.length)
          ? baseWhile(array, getIteratee(predicate, 3), false, true)
          : [];
      }
  
      /**
       * Creates a slice of `array` with elements taken from the beginning. Elements
       * are taken until `predicate` returns falsey. The predicate is invoked with
       * three arguments: (value, index, array).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Array
       * @param {Array} array The array to query.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the slice of `array`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'active': false },
       *   { 'user': 'fred',    'active': false },
       *   { 'user': 'pebbles', 'active': true }
       * ];
       *
       * _.takeWhile(users, function(o) { return !o.active; });
       * // => objects for ['barney', 'fred']
       *
       * // The `_.matches` iteratee shorthand.
       * _.takeWhile(users, { 'user': 'barney', 'active': false });
       * // => objects for ['barney']
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.takeWhile(users, ['active', false]);
       * // => objects for ['barney', 'fred']
       *
       * // The `_.property` iteratee shorthand.
       * _.takeWhile(users, 'active');
       * // => []
       */
      function takeWhile(array, predicate) {
        return (array && array.length)
          ? baseWhile(array, getIteratee(predicate, 3))
          : [];
      }
  
      /**
       * Creates an array of unique values, in order, from all given arrays using
       * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @returns {Array} Returns the new array of combined values.
       * @example
       *
       * _.union([2], [1, 2]);
       * // => [2, 1]
       */
      var union = baseRest(function(arrays) {
        return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));
      });
  
      /**
       * This method is like `_.union` except that it accepts `iteratee` which is
       * invoked for each element of each `arrays` to generate the criterion by
       * which uniqueness is computed. Result values are chosen from the first
       * array in which the value occurs. The iteratee is invoked with one argument:
       * (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Array} Returns the new array of combined values.
       * @example
       *
       * _.unionBy([2.1], [1.2, 2.3], Math.floor);
       * // => [2.1, 1.2]
       *
       * // The `_.property` iteratee shorthand.
       * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
       * // => [{ 'x': 1 }, { 'x': 2 }]
       */
      var unionBy = baseRest(function(arrays) {
        var iteratee = last(arrays);
        if (isArrayLikeObject(iteratee)) {
          iteratee = undefined;
        }
        return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2));
      });
  
      /**
       * This method is like `_.union` except that it accepts `comparator` which
       * is invoked to compare elements of `arrays`. Result values are chosen from
       * the first array in which the value occurs. The comparator is invoked
       * with two arguments: (arrVal, othVal).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of combined values.
       * @example
       *
       * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
       * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
       *
       * _.unionWith(objects, others, _.isEqual);
       * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
       */
      var unionWith = baseRest(function(arrays) {
        var comparator = last(arrays);
        comparator = typeof comparator == 'function' ? comparator : undefined;
        return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
      });
  
      /**
       * Creates a duplicate-free version of an array, using
       * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons, in which only the first occurrence of each element
       * is kept. The order of result values is determined by the order they occur
       * in the array.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @returns {Array} Returns the new duplicate free array.
       * @example
       *
       * _.uniq([2, 1, 2]);
       * // => [2, 1]
       */
      function uniq(array) {
        return (array && array.length) ? baseUniq(array) : [];
      }
  
      /**
       * This method is like `_.uniq` except that it accepts `iteratee` which is
       * invoked for each element in `array` to generate the criterion by which
       * uniqueness is computed. The order of result values is determined by the
       * order they occur in the array. The iteratee is invoked with one argument:
       * (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Array} Returns the new duplicate free array.
       * @example
       *
       * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
       * // => [2.1, 1.2]
       *
       * // The `_.property` iteratee shorthand.
       * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
       * // => [{ 'x': 1 }, { 'x': 2 }]
       */
      function uniqBy(array, iteratee) {
        return (array && array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : [];
      }
  
      /**
       * This method is like `_.uniq` except that it accepts `comparator` which
       * is invoked to compare elements of `array`. The order of result values is
       * determined by the order they occur in the array.The comparator is invoked
       * with two arguments: (arrVal, othVal).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new duplicate free array.
       * @example
       *
       * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];
       *
       * _.uniqWith(objects, _.isEqual);
       * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]
       */
      function uniqWith(array, comparator) {
        comparator = typeof comparator == 'function' ? comparator : undefined;
        return (array && array.length) ? baseUniq(array, undefined, comparator) : [];
      }
  
      /**
       * This method is like `_.zip` except that it accepts an array of grouped
       * elements and creates an array regrouping the elements to their pre-zip
       * configuration.
       *
       * @static
       * @memberOf _
       * @since 1.2.0
       * @category Array
       * @param {Array} array The array of grouped elements to process.
       * @returns {Array} Returns the new array of regrouped elements.
       * @example
       *
       * var zipped = _.zip(['a', 'b'], [1, 2], [true, false]);
       * // => [['a', 1, true], ['b', 2, false]]
       *
       * _.unzip(zipped);
       * // => [['a', 'b'], [1, 2], [true, false]]
       */
      function unzip(array) {
        if (!(array && array.length)) {
          return [];
        }
        var length = 0;
        array = arrayFilter(array, function(group) {
          if (isArrayLikeObject(group)) {
            length = nativeMax(group.length, length);
            return true;
          }
        });
        return baseTimes(length, function(index) {
          return arrayMap(array, baseProperty(index));
        });
      }
  
      /**
       * This method is like `_.unzip` except that it accepts `iteratee` to specify
       * how regrouped values should be combined. The iteratee is invoked with the
       * elements of each group: (...group).
       *
       * @static
       * @memberOf _
       * @since 3.8.0
       * @category Array
       * @param {Array} array The array of grouped elements to process.
       * @param {Function} [iteratee=_.identity] The function to combine
       *  regrouped values.
       * @returns {Array} Returns the new array of regrouped elements.
       * @example
       *
       * var zipped = _.zip([1, 2], [10, 20], [100, 200]);
       * // => [[1, 10, 100], [2, 20, 200]]
       *
       * _.unzipWith(zipped, _.add);
       * // => [3, 30, 300]
       */
      function unzipWith(array, iteratee) {
        if (!(array && array.length)) {
          return [];
        }
        var result = unzip(array);
        if (iteratee == null) {
          return result;
        }
        return arrayMap(result, function(group) {
          return apply(iteratee, undefined, group);
        });
      }
  
      /**
       * Creates an array excluding all given values using
       * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * for equality comparisons.
       *
       * **Note:** Unlike `_.pull`, this method returns a new array.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {Array} array The array to inspect.
       * @param {...*} [values] The values to exclude.
       * @returns {Array} Returns the new array of filtered values.
       * @see _.difference, _.xor
       * @example
       *
       * _.without([2, 1, 2, 3], 1, 2);
       * // => [3]
       */
      var without = baseRest(function(array, values) {
        return isArrayLikeObject(array)
          ? baseDifference(array, values)
          : [];
      });
  
      /**
       * Creates an array of unique values that is the
       * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
       * of the given arrays. The order of result values is determined by the order
       * they occur in the arrays.
       *
       * @static
       * @memberOf _
       * @since 2.4.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @returns {Array} Returns the new array of filtered values.
       * @see _.difference, _.without
       * @example
       *
       * _.xor([2, 1], [2, 3]);
       * // => [1, 3]
       */
      var xor = baseRest(function(arrays) {
        return baseXor(arrayFilter(arrays, isArrayLikeObject));
      });
  
      /**
       * This method is like `_.xor` except that it accepts `iteratee` which is
       * invoked for each element of each `arrays` to generate the criterion by
       * which by which they're compared. The order of result values is determined
       * by the order they occur in the arrays. The iteratee is invoked with one
       * argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Array} Returns the new array of filtered values.
       * @example
       *
       * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
       * // => [1.2, 3.4]
       *
       * // The `_.property` iteratee shorthand.
       * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
       * // => [{ 'x': 2 }]
       */
      var xorBy = baseRest(function(arrays) {
        var iteratee = last(arrays);
        if (isArrayLikeObject(iteratee)) {
          iteratee = undefined;
        }
        return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2));
      });
  
      /**
       * This method is like `_.xor` except that it accepts `comparator` which is
       * invoked to compare elements of `arrays`. The order of result values is
       * determined by the order they occur in the arrays. The comparator is invoked
       * with two arguments: (arrVal, othVal).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Array
       * @param {...Array} [arrays] The arrays to inspect.
       * @param {Function} [comparator] The comparator invoked per element.
       * @returns {Array} Returns the new array of filtered values.
       * @example
       *
       * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
       * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
       *
       * _.xorWith(objects, others, _.isEqual);
       * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
       */
      var xorWith = baseRest(function(arrays) {
        var comparator = last(arrays);
        comparator = typeof comparator == 'function' ? comparator : undefined;
        return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator);
      });
  
      /**
       * Creates an array of grouped elements, the first of which contains the
       * first elements of the given arrays, the second of which contains the
       * second elements of the given arrays, and so on.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Array
       * @param {...Array} [arrays] The arrays to process.
       * @returns {Array} Returns the new array of grouped elements.
       * @example
       *
       * _.zip(['a', 'b'], [1, 2], [true, false]);
       * // => [['a', 1, true], ['b', 2, false]]
       */
      var zip = baseRest(unzip);
  
      /**
       * This method is like `_.fromPairs` except that it accepts two arrays,
       * one of property identifiers and one of corresponding values.
       *
       * @static
       * @memberOf _
       * @since 0.4.0
       * @category Array
       * @param {Array} [props=[]] The property identifiers.
       * @param {Array} [values=[]] The property values.
       * @returns {Object} Returns the new object.
       * @example
       *
       * _.zipObject(['a', 'b'], [1, 2]);
       * // => { 'a': 1, 'b': 2 }
       */
      function zipObject(props, values) {
        return baseZipObject(props || [], values || [], assignValue);
      }
  
      /**
       * This method is like `_.zipObject` except that it supports property paths.
       *
       * @static
       * @memberOf _
       * @since 4.1.0
       * @category Array
       * @param {Array} [props=[]] The property identifiers.
       * @param {Array} [values=[]] The property values.
       * @returns {Object} Returns the new object.
       * @example
       *
       * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);
       * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }
       */
      function zipObjectDeep(props, values) {
        return baseZipObject(props || [], values || [], baseSet);
      }
  
      /**
       * This method is like `_.zip` except that it accepts `iteratee` to specify
       * how grouped values should be combined. The iteratee is invoked with the
       * elements of each group: (...group).
       *
       * @static
       * @memberOf _
       * @since 3.8.0
       * @category Array
       * @param {...Array} [arrays] The arrays to process.
       * @param {Function} [iteratee=_.identity] The function to combine
       *  grouped values.
       * @returns {Array} Returns the new array of grouped elements.
       * @example
       *
       * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
       *   return a + b + c;
       * });
       * // => [111, 222]
       */
      var zipWith = baseRest(function(arrays) {
        var length = arrays.length,
            iteratee = length > 1 ? arrays[length - 1] : undefined;
  
        iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined;
        return unzipWith(arrays, iteratee);
      });
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates a `lodash` wrapper instance that wraps `value` with explicit method
       * chain sequences enabled. The result of such sequences must be unwrapped
       * with `_#value`.
       *
       * @static
       * @memberOf _
       * @since 1.3.0
       * @category Seq
       * @param {*} value The value to wrap.
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'age': 36 },
       *   { 'user': 'fred',    'age': 40 },
       *   { 'user': 'pebbles', 'age': 1 }
       * ];
       *
       * var youngest = _
       *   .chain(users)
       *   .sortBy('age')
       *   .map(function(o) {
       *     return o.user + ' is ' + o.age;
       *   })
       *   .head()
       *   .value();
       * // => 'pebbles is 1'
       */
      function chain(value) {
        var result = lodash(value);
        result.__chain__ = true;
        return result;
      }
  
      /**
       * This method invokes `interceptor` and returns `value`. The interceptor
       * is invoked with one argument; (value). The purpose of this method is to
       * "tap into" a method chain sequence in order to modify intermediate results.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Seq
       * @param {*} value The value to provide to `interceptor`.
       * @param {Function} interceptor The function to invoke.
       * @returns {*} Returns `value`.
       * @example
       *
       * _([1, 2, 3])
       *  .tap(function(array) {
       *    // Mutate input array.
       *    array.pop();
       *  })
       *  .reverse()
       *  .value();
       * // => [2, 1]
       */
      function tap(value, interceptor) {
        interceptor(value);
        return value;
      }
  
      /**
       * This method is like `_.tap` except that it returns the result of `interceptor`.
       * The purpose of this method is to "pass thru" values replacing intermediate
       * results in a method chain sequence.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Seq
       * @param {*} value The value to provide to `interceptor`.
       * @param {Function} interceptor The function to invoke.
       * @returns {*} Returns the result of `interceptor`.
       * @example
       *
       * _('  abc  ')
       *  .chain()
       *  .trim()
       *  .thru(function(value) {
       *    return [value];
       *  })
       *  .value();
       * // => ['abc']
       */
      function thru(value, interceptor) {
        return interceptor(value);
      }
  
      /**
       * This method is the wrapper version of `_.at`.
       *
       * @name at
       * @memberOf _
       * @since 1.0.0
       * @category Seq
       * @param {...(string|string[])} [paths] The property paths to pick.
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
       *
       * _(object).at(['a[0].b.c', 'a[1]']).value();
       * // => [3, 4]
       */
      var wrapperAt = flatRest(function(paths) {
        var length = paths.length,
            start = length ? paths[0] : 0,
            value = this.__wrapped__,
            interceptor = function(object) { return baseAt(object, paths); };
  
        if (length > 1 || this.__actions__.length ||
            !(value instanceof LazyWrapper) || !isIndex(start)) {
          return this.thru(interceptor);
        }
        value = value.slice(start, +start + (length ? 1 : 0));
        value.__actions__.push({
          'func': thru,
          'args': [interceptor],
          'thisArg': undefined
        });
        return new LodashWrapper(value, this.__chain__).thru(function(array) {
          if (length && !array.length) {
            array.push(undefined);
          }
          return array;
        });
      });
  
      /**
       * Creates a `lodash` wrapper instance with explicit method chain sequences enabled.
       *
       * @name chain
       * @memberOf _
       * @since 0.1.0
       * @category Seq
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * var users = [
       *   { 'user': 'barney', 'age': 36 },
       *   { 'user': 'fred',   'age': 40 }
       * ];
       *
       * // A sequence without explicit chaining.
       * _(users).head();
       * // => { 'user': 'barney', 'age': 36 }
       *
       * // A sequence with explicit chaining.
       * _(users)
       *   .chain()
       *   .head()
       *   .pick('user')
       *   .value();
       * // => { 'user': 'barney' }
       */
      function wrapperChain() {
        return chain(this);
      }
  
      /**
       * Executes the chain sequence and returns the wrapped result.
       *
       * @name commit
       * @memberOf _
       * @since 3.2.0
       * @category Seq
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * var array = [1, 2];
       * var wrapped = _(array).push(3);
       *
       * console.log(array);
       * // => [1, 2]
       *
       * wrapped = wrapped.commit();
       * console.log(array);
       * // => [1, 2, 3]
       *
       * wrapped.last();
       * // => 3
       *
       * console.log(array);
       * // => [1, 2, 3]
       */
      function wrapperCommit() {
        return new LodashWrapper(this.value(), this.__chain__);
      }
  
      /**
       * Gets the next value on a wrapped object following the
       * [iterator protocol](https://mdn.io/iteration_protocols#iterator).
       *
       * @name next
       * @memberOf _
       * @since 4.0.0
       * @category Seq
       * @returns {Object} Returns the next iterator value.
       * @example
       *
       * var wrapped = _([1, 2]);
       *
       * wrapped.next();
       * // => { 'done': false, 'value': 1 }
       *
       * wrapped.next();
       * // => { 'done': false, 'value': 2 }
       *
       * wrapped.next();
       * // => { 'done': true, 'value': undefined }
       */
      function wrapperNext() {
        if (this.__values__ === undefined) {
          this.__values__ = toArray(this.value());
        }
        var done = this.__index__ >= this.__values__.length,
            value = done ? undefined : this.__values__[this.__index__++];
  
        return { 'done': done, 'value': value };
      }
  
      /**
       * Enables the wrapper to be iterable.
       *
       * @name Symbol.iterator
       * @memberOf _
       * @since 4.0.0
       * @category Seq
       * @returns {Object} Returns the wrapper object.
       * @example
       *
       * var wrapped = _([1, 2]);
       *
       * wrapped[Symbol.iterator]() === wrapped;
       * // => true
       *
       * Array.from(wrapped);
       * // => [1, 2]
       */
      function wrapperToIterator() {
        return this;
      }
  
      /**
       * Creates a clone of the chain sequence planting `value` as the wrapped value.
       *
       * @name plant
       * @memberOf _
       * @since 3.2.0
       * @category Seq
       * @param {*} value The value to plant.
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * function square(n) {
       *   return n * n;
       * }
       *
       * var wrapped = _([1, 2]).map(square);
       * var other = wrapped.plant([3, 4]);
       *
       * other.value();
       * // => [9, 16]
       *
       * wrapped.value();
       * // => [1, 4]
       */
      function wrapperPlant(value) {
        var result,
            parent = this;
  
        while (parent instanceof baseLodash) {
          var clone = wrapperClone(parent);
          clone.__index__ = 0;
          clone.__values__ = undefined;
          if (result) {
            previous.__wrapped__ = clone;
          } else {
            result = clone;
          }
          var previous = clone;
          parent = parent.__wrapped__;
        }
        previous.__wrapped__ = value;
        return result;
      }
  
      /**
       * This method is the wrapper version of `_.reverse`.
       *
       * **Note:** This method mutates the wrapped array.
       *
       * @name reverse
       * @memberOf _
       * @since 0.1.0
       * @category Seq
       * @returns {Object} Returns the new `lodash` wrapper instance.
       * @example
       *
       * var array = [1, 2, 3];
       *
       * _(array).reverse().value()
       * // => [3, 2, 1]
       *
       * console.log(array);
       * // => [3, 2, 1]
       */
      function wrapperReverse() {
        var value = this.__wrapped__;
        if (value instanceof LazyWrapper) {
          var wrapped = value;
          if (this.__actions__.length) {
            wrapped = new LazyWrapper(this);
          }
          wrapped = wrapped.reverse();
          wrapped.__actions__.push({
            'func': thru,
            'args': [reverse],
            'thisArg': undefined
          });
          return new LodashWrapper(wrapped, this.__chain__);
        }
        return this.thru(reverse);
      }
  
      /**
       * Executes the chain sequence to resolve the unwrapped value.
       *
       * @name value
       * @memberOf _
       * @since 0.1.0
       * @alias toJSON, valueOf
       * @category Seq
       * @returns {*} Returns the resolved unwrapped value.
       * @example
       *
       * _([1, 2, 3]).value();
       * // => [1, 2, 3]
       */
      function wrapperValue() {
        return baseWrapperValue(this.__wrapped__, this.__actions__);
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Creates an object composed of keys generated from the results of running
       * each element of `collection` thru `iteratee`. The corresponding value of
       * each key is the number of times the key was returned by `iteratee`. The
       * iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 0.5.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
       * @returns {Object} Returns the composed aggregate object.
       * @example
       *
       * _.countBy([6.1, 4.2, 6.3], Math.floor);
       * // => { '4': 1, '6': 2 }
       *
       * // The `_.property` iteratee shorthand.
       * _.countBy(['one', 'two', 'three'], 'length');
       * // => { '3': 2, '5': 1 }
       */
      var countBy = createAggregator(function(result, value, key) {
        if (hasOwnProperty.call(result, key)) {
          ++result[key];
        } else {
          baseAssignValue(result, key, 1);
        }
      });
  
      /**
       * Checks if `predicate` returns truthy for **all** elements of `collection`.
       * Iteration is stopped once `predicate` returns falsey. The predicate is
       * invoked with three arguments: (value, index|key, collection).
       *
       * **Note:** This method returns `true` for
       * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
       * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
       * elements of empty collections.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {boolean} Returns `true` if all elements pass the predicate check,
       *  else `false`.
       * @example
       *
       * _.every([true, 1, null, 'yes'], Boolean);
       * // => false
       *
       * var users = [
       *   { 'user': 'barney', 'age': 36, 'active': false },
       *   { 'user': 'fred',   'age': 40, 'active': false }
       * ];
       *
       * // The `_.matches` iteratee shorthand.
       * _.every(users, { 'user': 'barney', 'active': false });
       * // => false
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.every(users, ['active', false]);
       * // => true
       *
       * // The `_.property` iteratee shorthand.
       * _.every(users, 'active');
       * // => false
       */
      function every(collection, predicate, guard) {
        var func = isArray(collection) ? arrayEvery : baseEvery;
        if (guard && isIterateeCall(collection, predicate, guard)) {
          predicate = undefined;
        }
        return func(collection, getIteratee(predicate, 3));
      }
  
      /**
       * Iterates over elements of `collection`, returning an array of all elements
       * `predicate` returns truthy for. The predicate is invoked with three
       * arguments: (value, index|key, collection).
       *
       * **Note:** Unlike `_.remove`, this method returns a new array.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the new filtered array.
       * @see _.reject
       * @example
       *
       * var users = [
       *   { 'user': 'barney', 'age': 36, 'active': true },
       *   { 'user': 'fred',   'age': 40, 'active': false }
       * ];
       *
       * _.filter(users, function(o) { return !o.active; });
       * // => objects for ['fred']
       *
       * // The `_.matches` iteratee shorthand.
       * _.filter(users, { 'age': 36, 'active': true });
       * // => objects for ['barney']
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.filter(users, ['active', false]);
       * // => objects for ['fred']
       *
       * // The `_.property` iteratee shorthand.
       * _.filter(users, 'active');
       * // => objects for ['barney']
       */
      function filter(collection, predicate) {
        var func = isArray(collection) ? arrayFilter : baseFilter;
        return func(collection, getIteratee(predicate, 3));
      }
  
      /**
       * Iterates over elements of `collection`, returning the first element
       * `predicate` returns truthy for. The predicate is invoked with three
       * arguments: (value, index|key, collection).
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to inspect.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @param {number} [fromIndex=0] The index to search from.
       * @returns {*} Returns the matched element, else `undefined`.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'age': 36, 'active': true },
       *   { 'user': 'fred',    'age': 40, 'active': false },
       *   { 'user': 'pebbles', 'age': 1,  'active': true }
       * ];
       *
       * _.find(users, function(o) { return o.age < 40; });
       * // => object for 'barney'
       *
       * // The `_.matches` iteratee shorthand.
       * _.find(users, { 'age': 1, 'active': true });
       * // => object for 'pebbles'
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.find(users, ['active', false]);
       * // => object for 'fred'
       *
       * // The `_.property` iteratee shorthand.
       * _.find(users, 'active');
       * // => object for 'barney'
       */
      var find = createFind(findIndex);
  
      /**
       * This method is like `_.find` except that it iterates over elements of
       * `collection` from right to left.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to inspect.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @param {number} [fromIndex=collection.length-1] The index to search from.
       * @returns {*} Returns the matched element, else `undefined`.
       * @example
       *
       * _.findLast([1, 2, 3, 4], function(n) {
       *   return n % 2 == 1;
       * });
       * // => 3
       */
      var findLast = createFind(findLastIndex);
  
      /**
       * Creates a flattened array of values by running each element in `collection`
       * thru `iteratee` and flattening the mapped results. The iteratee is invoked
       * with three arguments: (value, index|key, collection).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the new flattened array.
       * @example
       *
       * function duplicate(n) {
       *   return [n, n];
       * }
       *
       * _.flatMap([1, 2], duplicate);
       * // => [1, 1, 2, 2]
       */
      function flatMap(collection, iteratee) {
        return baseFlatten(map(collection, iteratee), 1);
      }
  
      /**
       * This method is like `_.flatMap` except that it recursively flattens the
       * mapped results.
       *
       * @static
       * @memberOf _
       * @since 4.7.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the new flattened array.
       * @example
       *
       * function duplicate(n) {
       *   return [[[n, n]]];
       * }
       *
       * _.flatMapDeep([1, 2], duplicate);
       * // => [1, 1, 2, 2]
       */
      function flatMapDeep(collection, iteratee) {
        return baseFlatten(map(collection, iteratee), INFINITY);
      }
  
      /**
       * This method is like `_.flatMap` except that it recursively flattens the
       * mapped results up to `depth` times.
       *
       * @static
       * @memberOf _
       * @since 4.7.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @param {number} [depth=1] The maximum recursion depth.
       * @returns {Array} Returns the new flattened array.
       * @example
       *
       * function duplicate(n) {
       *   return [[[n, n]]];
       * }
       *
       * _.flatMapDepth([1, 2], duplicate, 2);
       * // => [[1, 1], [2, 2]]
       */
      function flatMapDepth(collection, iteratee, depth) {
        depth = depth === undefined ? 1 : toInteger(depth);
        return baseFlatten(map(collection, iteratee), depth);
      }
  
      /**
       * Iterates over elements of `collection` and invokes `iteratee` for each element.
       * The iteratee is invoked with three arguments: (value, index|key, collection).
       * Iteratee functions may exit iteration early by explicitly returning `false`.
       *
       * **Note:** As with other "Collections" methods, objects with a "length"
       * property are iterated like arrays. To avoid this behavior use `_.forIn`
       * or `_.forOwn` for object iteration.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @alias each
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Array|Object} Returns `collection`.
       * @see _.forEachRight
       * @example
       *
       * _.forEach([1, 2], function(value) {
       *   console.log(value);
       * });
       * // => Logs `1` then `2`.
       *
       * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
       *   console.log(key);
       * });
       * // => Logs 'a' then 'b' (iteration order is not guaranteed).
       */
      function forEach(collection, iteratee) {
        var func = isArray(collection) ? arrayEach : baseEach;
        return func(collection, getIteratee(iteratee, 3));
      }
  
      /**
       * This method is like `_.forEach` except that it iterates over elements of
       * `collection` from right to left.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @alias eachRight
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Array|Object} Returns `collection`.
       * @see _.forEach
       * @example
       *
       * _.forEachRight([1, 2], function(value) {
       *   console.log(value);
       * });
       * // => Logs `2` then `1`.
       */
      function forEachRight(collection, iteratee) {
        var func = isArray(collection) ? arrayEachRight : baseEachRight;
        return func(collection, getIteratee(iteratee, 3));
      }
  
      /**
       * Creates an object composed of keys generated from the results of running
       * each element of `collection` thru `iteratee`. The order of grouped values
       * is determined by the order they occur in `collection`. The corresponding
       * value of each key is an array of elements responsible for generating the
       * key. The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
       * @returns {Object} Returns the composed aggregate object.
       * @example
       *
       * _.groupBy([6.1, 4.2, 6.3], Math.floor);
       * // => { '4': [4.2], '6': [6.1, 6.3] }
       *
       * // The `_.property` iteratee shorthand.
       * _.groupBy(['one', 'two', 'three'], 'length');
       * // => { '3': ['one', 'two'], '5': ['three'] }
       */
      var groupBy = createAggregator(function(result, value, key) {
        if (hasOwnProperty.call(result, key)) {
          result[key].push(value);
        } else {
          baseAssignValue(result, key, [value]);
        }
      });
  
      /**
       * Checks if `value` is in `collection`. If `collection` is a string, it's
       * checked for a substring of `value`, otherwise
       * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * is used for equality comparisons. If `fromIndex` is negative, it's used as
       * the offset from the end of `collection`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object|string} collection The collection to inspect.
       * @param {*} value The value to search for.
       * @param {number} [fromIndex=0] The index to search from.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
       * @returns {boolean} Returns `true` if `value` is found, else `false`.
       * @example
       *
       * _.includes([1, 2, 3], 1);
       * // => true
       *
       * _.includes([1, 2, 3], 1, 2);
       * // => false
       *
       * _.includes({ 'a': 1, 'b': 2 }, 1);
       * // => true
       *
       * _.includes('abcd', 'bc');
       * // => true
       */
      function includes(collection, value, fromIndex, guard) {
        collection = isArrayLike(collection) ? collection : values(collection);
        fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0;
  
        var length = collection.length;
        if (fromIndex < 0) {
          fromIndex = nativeMax(length + fromIndex, 0);
        }
        return isString(collection)
          ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1)
          : (!!length && baseIndexOf(collection, value, fromIndex) > -1);
      }
  
      /**
       * Invokes the method at `path` of each element in `collection`, returning
       * an array of the results of each invoked method. Any additional arguments
       * are provided to each invoked method. If `path` is a function, it's invoked
       * for, and `this` bound to, each element in `collection`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Array|Function|string} path The path of the method to invoke or
       *  the function invoked per iteration.
       * @param {...*} [args] The arguments to invoke each method with.
       * @returns {Array} Returns the array of results.
       * @example
       *
       * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
       * // => [[1, 5, 7], [1, 2, 3]]
       *
       * _.invokeMap([123, 456], String.prototype.split, '');
       * // => [['1', '2', '3'], ['4', '5', '6']]
       */
      var invokeMap = baseRest(function(collection, path, args) {
        var index = -1,
            isFunc = typeof path == 'function',
            result = isArrayLike(collection) ? Array(collection.length) : [];
  
        baseEach(collection, function(value) {
          result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
        });
        return result;
      });
  
      /**
       * Creates an object composed of keys generated from the results of running
       * each element of `collection` thru `iteratee`. The corresponding value of
       * each key is the last element responsible for generating the key. The
       * iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
       * @returns {Object} Returns the composed aggregate object.
       * @example
       *
       * var array = [
       *   { 'dir': 'left', 'code': 97 },
       *   { 'dir': 'right', 'code': 100 }
       * ];
       *
       * _.keyBy(array, function(o) {
       *   return String.fromCharCode(o.code);
       * });
       * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
       *
       * _.keyBy(array, 'dir');
       * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
       */
      var keyBy = createAggregator(function(result, value, key) {
        baseAssignValue(result, key, value);
      });
  
      /**
       * Creates an array of values by running each element in `collection` thru
       * `iteratee`. The iteratee is invoked with three arguments:
       * (value, index|key, collection).
       *
       * Many lodash methods are guarded to work as iteratees for methods like
       * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
       *
       * The guarded methods are:
       * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
       * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
       * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
       * `template`, `trim`, `trimEnd`, `trimStart`, and `words`
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the new mapped array.
       * @example
       *
       * function square(n) {
       *   return n * n;
       * }
       *
       * _.map([4, 8], square);
       * // => [16, 64]
       *
       * _.map({ 'a': 4, 'b': 8 }, square);
       * // => [16, 64] (iteration order is not guaranteed)
       *
       * var users = [
       *   { 'user': 'barney' },
       *   { 'user': 'fred' }
       * ];
       *
       * // The `_.property` iteratee shorthand.
       * _.map(users, 'user');
       * // => ['barney', 'fred']
       */
      function map(collection, iteratee) {
        var func = isArray(collection) ? arrayMap : baseMap;
        return func(collection, getIteratee(iteratee, 3));
      }
  
      /**
       * This method is like `_.sortBy` except that it allows specifying the sort
       * orders of the iteratees to sort by. If `orders` is unspecified, all values
       * are sorted in ascending order. Otherwise, specify an order of "desc" for
       * descending or "asc" for ascending sort order of corresponding values.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]]
       *  The iteratees to sort by.
       * @param {string[]} [orders] The sort orders of `iteratees`.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
       * @returns {Array} Returns the new sorted array.
       * @example
       *
       * var users = [
       *   { 'user': 'fred',   'age': 48 },
       *   { 'user': 'barney', 'age': 34 },
       *   { 'user': 'fred',   'age': 40 },
       *   { 'user': 'barney', 'age': 36 }
       * ];
       *
       * // Sort by `user` in ascending order and by `age` in descending order.
       * _.orderBy(users, ['user', 'age'], ['asc', 'desc']);
       * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
       */
      function orderBy(collection, iteratees, orders, guard) {
        if (collection == null) {
          return [];
        }
        if (!isArray(iteratees)) {
          iteratees = iteratees == null ? [] : [iteratees];
        }
        orders = guard ? undefined : orders;
        if (!isArray(orders)) {
          orders = orders == null ? [] : [orders];
        }
        return baseOrderBy(collection, iteratees, orders);
      }
  
      /**
       * Creates an array of elements split into two groups, the first of which
       * contains elements `predicate` returns truthy for, the second of which
       * contains elements `predicate` returns falsey for. The predicate is
       * invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the array of grouped elements.
       * @example
       *
       * var users = [
       *   { 'user': 'barney',  'age': 36, 'active': false },
       *   { 'user': 'fred',    'age': 40, 'active': true },
       *   { 'user': 'pebbles', 'age': 1,  'active': false }
       * ];
       *
       * _.partition(users, function(o) { return o.active; });
       * // => objects for [['fred'], ['barney', 'pebbles']]
       *
       * // The `_.matches` iteratee shorthand.
       * _.partition(users, { 'age': 1, 'active': false });
       * // => objects for [['pebbles'], ['barney', 'fred']]
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.partition(users, ['active', false]);
       * // => objects for [['barney', 'pebbles'], ['fred']]
       *
       * // The `_.property` iteratee shorthand.
       * _.partition(users, 'active');
       * // => objects for [['fred'], ['barney', 'pebbles']]
       */
      var partition = createAggregator(function(result, value, key) {
        result[key ? 0 : 1].push(value);
      }, function() { return [[], []]; });
  
      /**
       * Reduces `collection` to a value which is the accumulated result of running
       * each element in `collection` thru `iteratee`, where each successive
       * invocation is supplied the return value of the previous. If `accumulator`
       * is not given, the first element of `collection` is used as the initial
       * value. The iteratee is invoked with four arguments:
       * (accumulator, value, index|key, collection).
       *
       * Many lodash methods are guarded to work as iteratees for methods like
       * `_.reduce`, `_.reduceRight`, and `_.transform`.
       *
       * The guarded methods are:
       * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,
       * and `sortBy`
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @param {*} [accumulator] The initial value.
       * @returns {*} Returns the accumulated value.
       * @see _.reduceRight
       * @example
       *
       * _.reduce([1, 2], function(sum, n) {
       *   return sum + n;
       * }, 0);
       * // => 3
       *
       * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
       *   (result[value] || (result[value] = [])).push(key);
       *   return result;
       * }, {});
       * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
       */
      function reduce(collection, iteratee, accumulator) {
        var func = isArray(collection) ? arrayReduce : baseReduce,
            initAccum = arguments.length < 3;
  
        return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach);
      }
  
      /**
       * This method is like `_.reduce` except that it iterates over elements of
       * `collection` from right to left.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @param {*} [accumulator] The initial value.
       * @returns {*} Returns the accumulated value.
       * @see _.reduce
       * @example
       *
       * var array = [[0, 1], [2, 3], [4, 5]];
       *
       * _.reduceRight(array, function(flattened, other) {
       *   return flattened.concat(other);
       * }, []);
       * // => [4, 5, 2, 3, 0, 1]
       */
      function reduceRight(collection, iteratee, accumulator) {
        var func = isArray(collection) ? arrayReduceRight : baseReduce,
            initAccum = arguments.length < 3;
  
        return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);
      }
  
      /**
       * The opposite of `_.filter`; this method returns the elements of `collection`
       * that `predicate` does **not** return truthy for.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the new filtered array.
       * @see _.filter
       * @example
       *
       * var users = [
       *   { 'user': 'barney', 'age': 36, 'active': false },
       *   { 'user': 'fred',   'age': 40, 'active': true }
       * ];
       *
       * _.reject(users, function(o) { return !o.active; });
       * // => objects for ['fred']
       *
       * // The `_.matches` iteratee shorthand.
       * _.reject(users, { 'age': 40, 'active': true });
       * // => objects for ['barney']
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.reject(users, ['active', false]);
       * // => objects for ['fred']
       *
       * // The `_.property` iteratee shorthand.
       * _.reject(users, 'active');
       * // => objects for ['barney']
       */
      function reject(collection, predicate) {
        var func = isArray(collection) ? arrayFilter : baseFilter;
        return func(collection, negate(getIteratee(predicate, 3)));
      }
  
      /**
       * Gets a random element from `collection`.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to sample.
       * @returns {*} Returns the random element.
       * @example
       *
       * _.sample([1, 2, 3, 4]);
       * // => 2
       */
      function sample(collection) {
        var func = isArray(collection) ? arraySample : baseSample;
        return func(collection);
      }
  
      /**
       * Gets `n` random elements at unique keys from `collection` up to the
       * size of `collection`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Collection
       * @param {Array|Object} collection The collection to sample.
       * @param {number} [n=1] The number of elements to sample.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the random elements.
       * @example
       *
       * _.sampleSize([1, 2, 3], 2);
       * // => [3, 1]
       *
       * _.sampleSize([1, 2, 3], 4);
       * // => [2, 3, 1]
       */
      function sampleSize(collection, n, guard) {
        if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {
          n = 1;
        } else {
          n = toInteger(n);
        }
        var func = isArray(collection) ? arraySampleSize : baseSampleSize;
        return func(collection, n);
      }
  
      /**
       * Creates an array of shuffled values, using a version of the
       * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to shuffle.
       * @returns {Array} Returns the new shuffled array.
       * @example
       *
       * _.shuffle([1, 2, 3, 4]);
       * // => [4, 1, 3, 2]
       */
      function shuffle(collection) {
        var func = isArray(collection) ? arrayShuffle : baseShuffle;
        return func(collection);
      }
  
      /**
       * Gets the size of `collection` by returning its length for array-like
       * values or the number of own enumerable string keyed properties for objects.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object|string} collection The collection to inspect.
       * @returns {number} Returns the collection size.
       * @example
       *
       * _.size([1, 2, 3]);
       * // => 3
       *
       * _.size({ 'a': 1, 'b': 2 });
       * // => 2
       *
       * _.size('pebbles');
       * // => 7
       */
      function size(collection) {
        if (collection == null) {
          return 0;
        }
        if (isArrayLike(collection)) {
          return isString(collection) ? stringSize(collection) : collection.length;
        }
        var tag = getTag(collection);
        if (tag == mapTag || tag == setTag) {
          return collection.size;
        }
        return baseKeys(collection).length;
      }
  
      /**
       * Checks if `predicate` returns truthy for **any** element of `collection`.
       * Iteration is stopped once `predicate` returns truthy. The predicate is
       * invoked with three arguments: (value, index|key, collection).
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {boolean} Returns `true` if any element passes the predicate check,
       *  else `false`.
       * @example
       *
       * _.some([null, 0, 'yes', false], Boolean);
       * // => true
       *
       * var users = [
       *   { 'user': 'barney', 'active': true },
       *   { 'user': 'fred',   'active': false }
       * ];
       *
       * // The `_.matches` iteratee shorthand.
       * _.some(users, { 'user': 'barney', 'active': false });
       * // => false
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.some(users, ['active', false]);
       * // => true
       *
       * // The `_.property` iteratee shorthand.
       * _.some(users, 'active');
       * // => true
       */
      function some(collection, predicate, guard) {
        var func = isArray(collection) ? arraySome : baseSome;
        if (guard && isIterateeCall(collection, predicate, guard)) {
          predicate = undefined;
        }
        return func(collection, getIteratee(predicate, 3));
      }
  
      /**
       * Creates an array of elements, sorted in ascending order by the results of
       * running each element in a collection thru each iteratee. This method
       * performs a stable sort, that is, it preserves the original sort order of
       * equal elements. The iteratees are invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Collection
       * @param {Array|Object} collection The collection to iterate over.
       * @param {...(Function|Function[])} [iteratees=[_.identity]]
       *  The iteratees to sort by.
       * @returns {Array} Returns the new sorted array.
       * @example
       *
       * var users = [
       *   { 'user': 'fred',   'age': 48 },
       *   { 'user': 'barney', 'age': 36 },
       *   { 'user': 'fred',   'age': 40 },
       *   { 'user': 'barney', 'age': 34 }
       * ];
       *
       * _.sortBy(users, [function(o) { return o.user; }]);
       * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
       *
       * _.sortBy(users, ['user', 'age']);
       * // => objects for [['barney', 34], ['barney', 36], ['fred', 40], ['fred', 48]]
       */
      var sortBy = baseRest(function(collection, iteratees) {
        if (collection == null) {
          return [];
        }
        var length = iteratees.length;
        if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) {
          iteratees = [];
        } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {
          iteratees = [iteratees[0]];
        }
        return baseOrderBy(collection, baseFlatten(iteratees, 1), []);
      });
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Gets the timestamp of the number of milliseconds that have elapsed since
       * the Unix epoch (1 January 1970 00:00:00 UTC).
       *
       * @static
       * @memberOf _
       * @since 2.4.0
       * @category Date
       * @returns {number} Returns the timestamp.
       * @example
       *
       * _.defer(function(stamp) {
       *   console.log(_.now() - stamp);
       * }, _.now());
       * // => Logs the number of milliseconds it took for the deferred invocation.
       */
      var now = ctxNow || function() {
        return root.Date.now();
      };
  
      /*------------------------------------------------------------------------*/
  
      /**
       * The opposite of `_.before`; this method creates a function that invokes
       * `func` once it's called `n` or more times.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {number} n The number of calls before `func` is invoked.
       * @param {Function} func The function to restrict.
       * @returns {Function} Returns the new restricted function.
       * @example
       *
       * var saves = ['profile', 'settings'];
       *
       * var done = _.after(saves.length, function() {
       *   console.log('done saving!');
       * });
       *
       * _.forEach(saves, function(type) {
       *   asyncSave({ 'type': type, 'complete': done });
       * });
       * // => Logs 'done saving!' after the two async saves have completed.
       */
      function after(n, func) {
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        n = toInteger(n);
        return function() {
          if (--n < 1) {
            return func.apply(this, arguments);
          }
        };
      }
  
      /**
       * Creates a function that invokes `func`, with up to `n` arguments,
       * ignoring any additional arguments.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Function
       * @param {Function} func The function to cap arguments for.
       * @param {number} [n=func.length] The arity cap.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Function} Returns the new capped function.
       * @example
       *
       * _.map(['6', '8', '10'], _.ary(parseInt, 1));
       * // => [6, 8, 10]
       */
      function ary(func, n, guard) {
        n = guard ? undefined : n;
        n = (func && n == null) ? func.length : n;
        return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n);
      }
  
      /**
       * Creates a function that invokes `func`, with the `this` binding and arguments
       * of the created function, while it's called less than `n` times. Subsequent
       * calls to the created function return the result of the last `func` invocation.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Function
       * @param {number} n The number of calls at which `func` is no longer invoked.
       * @param {Function} func The function to restrict.
       * @returns {Function} Returns the new restricted function.
       * @example
       *
       * jQuery(element).on('click', _.before(5, addContactToList));
       * // => Allows adding up to 4 contacts to the list.
       */
      function before(n, func) {
        var result;
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        n = toInteger(n);
        return function() {
          if (--n > 0) {
            result = func.apply(this, arguments);
          }
          if (n <= 1) {
            func = undefined;
          }
          return result;
        };
      }
  
      /**
       * Creates a function that invokes `func` with the `this` binding of `thisArg`
       * and `partials` prepended to the arguments it receives.
       *
       * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
       * may be used as a placeholder for partially applied arguments.
       *
       * **Note:** Unlike native `Function#bind`, this method doesn't set the "length"
       * property of bound functions.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to bind.
       * @param {*} thisArg The `this` binding of `func`.
       * @param {...*} [partials] The arguments to be partially applied.
       * @returns {Function} Returns the new bound function.
       * @example
       *
       * function greet(greeting, punctuation) {
       *   return greeting + ' ' + this.user + punctuation;
       * }
       *
       * var object = { 'user': 'fred' };
       *
       * var bound = _.bind(greet, object, 'hi');
       * bound('!');
       * // => 'hi fred!'
       *
       * // Bound with placeholders.
       * var bound = _.bind(greet, object, _, '!');
       * bound('hi');
       * // => 'hi fred!'
       */
      var bind = baseRest(function(func, thisArg, partials) {
        var bitmask = WRAP_BIND_FLAG;
        if (partials.length) {
          var holders = replaceHolders(partials, getHolder(bind));
          bitmask |= WRAP_PARTIAL_FLAG;
        }
        return createWrap(func, bitmask, thisArg, partials, holders);
      });
  
      /**
       * Creates a function that invokes the method at `object[key]` with `partials`
       * prepended to the arguments it receives.
       *
       * This method differs from `_.bind` by allowing bound functions to reference
       * methods that may be redefined or don't yet exist. See
       * [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
       * for more details.
       *
       * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
       * builds, may be used as a placeholder for partially applied arguments.
       *
       * @static
       * @memberOf _
       * @since 0.10.0
       * @category Function
       * @param {Object} object The object to invoke the method on.
       * @param {string} key The key of the method.
       * @param {...*} [partials] The arguments to be partially applied.
       * @returns {Function} Returns the new bound function.
       * @example
       *
       * var object = {
       *   'user': 'fred',
       *   'greet': function(greeting, punctuation) {
       *     return greeting + ' ' + this.user + punctuation;
       *   }
       * };
       *
       * var bound = _.bindKey(object, 'greet', 'hi');
       * bound('!');
       * // => 'hi fred!'
       *
       * object.greet = function(greeting, punctuation) {
       *   return greeting + 'ya ' + this.user + punctuation;
       * };
       *
       * bound('!');
       * // => 'hiya fred!'
       *
       * // Bound with placeholders.
       * var bound = _.bindKey(object, 'greet', _, '!');
       * bound('hi');
       * // => 'hiya fred!'
       */
      var bindKey = baseRest(function(object, key, partials) {
        var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;
        if (partials.length) {
          var holders = replaceHolders(partials, getHolder(bindKey));
          bitmask |= WRAP_PARTIAL_FLAG;
        }
        return createWrap(key, bitmask, object, partials, holders);
      });
  
      /**
       * Creates a function that accepts arguments of `func` and either invokes
       * `func` returning its result, if at least `arity` number of arguments have
       * been provided, or returns a function that accepts the remaining `func`
       * arguments, and so on. The arity of `func` may be specified if `func.length`
       * is not sufficient.
       *
       * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
       * may be used as a placeholder for provided arguments.
       *
       * **Note:** This method doesn't set the "length" property of curried functions.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Function
       * @param {Function} func The function to curry.
       * @param {number} [arity=func.length] The arity of `func`.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Function} Returns the new curried function.
       * @example
       *
       * var abc = function(a, b, c) {
       *   return [a, b, c];
       * };
       *
       * var curried = _.curry(abc);
       *
       * curried(1)(2)(3);
       * // => [1, 2, 3]
       *
       * curried(1, 2)(3);
       * // => [1, 2, 3]
       *
       * curried(1, 2, 3);
       * // => [1, 2, 3]
       *
       * // Curried with placeholders.
       * curried(1)(_, 3)(2);
       * // => [1, 2, 3]
       */
      function curry(func, arity, guard) {
        arity = guard ? undefined : arity;
        var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
        result.placeholder = curry.placeholder;
        return result;
      }
  
      /**
       * This method is like `_.curry` except that arguments are applied to `func`
       * in the manner of `_.partialRight` instead of `_.partial`.
       *
       * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
       * builds, may be used as a placeholder for provided arguments.
       *
       * **Note:** This method doesn't set the "length" property of curried functions.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Function
       * @param {Function} func The function to curry.
       * @param {number} [arity=func.length] The arity of `func`.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Function} Returns the new curried function.
       * @example
       *
       * var abc = function(a, b, c) {
       *   return [a, b, c];
       * };
       *
       * var curried = _.curryRight(abc);
       *
       * curried(3)(2)(1);
       * // => [1, 2, 3]
       *
       * curried(2, 3)(1);
       * // => [1, 2, 3]
       *
       * curried(1, 2, 3);
       * // => [1, 2, 3]
       *
       * // Curried with placeholders.
       * curried(3)(1, _)(2);
       * // => [1, 2, 3]
       */
      function curryRight(func, arity, guard) {
        arity = guard ? undefined : arity;
        var result = createWrap(func, WRAP_CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
        result.placeholder = curryRight.placeholder;
        return result;
      }
  
      /**
       * Creates a debounced function that delays invoking `func` until after `wait`
       * milliseconds have elapsed since the last time the debounced function was
       * invoked. The debounced function comes with a `cancel` method to cancel
       * delayed `func` invocations and a `flush` method to immediately invoke them.
       * Provide `options` to indicate whether `func` should be invoked on the
       * leading and/or trailing edge of the `wait` timeout. The `func` is invoked
       * with the last arguments provided to the debounced function. Subsequent
       * calls to the debounced function return the result of the last `func`
       * invocation.
       *
       * **Note:** If `leading` and `trailing` options are `true`, `func` is
       * invoked on the trailing edge of the timeout only if the debounced function
       * is invoked more than once during the `wait` timeout.
       *
       * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
       * until to the next tick, similar to `setTimeout` with a timeout of `0`.
       *
       * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
       * for details over the differences between `_.debounce` and `_.throttle`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to debounce.
       * @param {number} [wait=0] The number of milliseconds to delay.
       * @param {Object} [options={}] The options object.
       * @param {boolean} [options.leading=false]
       *  Specify invoking on the leading edge of the timeout.
       * @param {number} [options.maxWait]
       *  The maximum time `func` is allowed to be delayed before it's invoked.
       * @param {boolean} [options.trailing=true]
       *  Specify invoking on the trailing edge of the timeout.
       * @returns {Function} Returns the new debounced function.
       * @example
       *
       * // Avoid costly calculations while the window size is in flux.
       * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
       *
       * // Invoke `sendMail` when clicked, debouncing subsequent calls.
       * jQuery(element).on('click', _.debounce(sendMail, 300, {
       *   'leading': true,
       *   'trailing': false
       * }));
       *
       * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
       * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
       * var source = new EventSource('/stream');
       * jQuery(source).on('message', debounced);
       *
       * // Cancel the trailing debounced invocation.
       * jQuery(window).on('popstate', debounced.cancel);
       */
      function debounce(func, wait, options) {
        var lastArgs,
            lastThis,
            maxWait,
            result,
            timerId,
            lastCallTime,
            lastInvokeTime = 0,
            leading = false,
            maxing = false,
            trailing = true;
  
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        wait = toNumber(wait) || 0;
        if (isObject(options)) {
          leading = !!options.leading;
          maxing = 'maxWait' in options;
          maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
          trailing = 'trailing' in options ? !!options.trailing : trailing;
        }
  
        function invokeFunc(time) {
          var args = lastArgs,
              thisArg = lastThis;
  
          lastArgs = lastThis = undefined;
          lastInvokeTime = time;
          result = func.apply(thisArg, args);
          return result;
        }
  
        function leadingEdge(time) {
          // Reset any `maxWait` timer.
          lastInvokeTime = time;
          // Start the timer for the trailing edge.
          timerId = setTimeout(timerExpired, wait);
          // Invoke the leading edge.
          return leading ? invokeFunc(time) : result;
        }
  
        function remainingWait(time) {
          var timeSinceLastCall = time - lastCallTime,
              timeSinceLastInvoke = time - lastInvokeTime,
              result = wait - timeSinceLastCall;
  
          return maxing ? nativeMin(result, maxWait - timeSinceLastInvoke) : result;
        }
  
        function shouldInvoke(time) {
          var timeSinceLastCall = time - lastCallTime,
              timeSinceLastInvoke = time - lastInvokeTime;
  
          // Either this is the first call, activity has stopped and we're at the
          // trailing edge, the system time has gone backwards and we're treating
          // it as the trailing edge, or we've hit the `maxWait` limit.
          return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||
            (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
        }
  
        function timerExpired() {
          var time = now();
          if (shouldInvoke(time)) {
            return trailingEdge(time);
          }
          // Restart the timer.
          timerId = setTimeout(timerExpired, remainingWait(time));
        }
  
        function trailingEdge(time) {
          timerId = undefined;
  
          // Only invoke if we have `lastArgs` which means `func` has been
          // debounced at least once.
          if (trailing && lastArgs) {
            return invokeFunc(time);
          }
          lastArgs = lastThis = undefined;
          return result;
        }
  
        function cancel() {
          if (timerId !== undefined) {
            clearTimeout(timerId);
          }
          lastInvokeTime = 0;
          lastArgs = lastCallTime = lastThis = timerId = undefined;
        }
  
        function flush() {
          return timerId === undefined ? result : trailingEdge(now());
        }
  
        function debounced() {
          var time = now(),
              isInvoking = shouldInvoke(time);
  
          lastArgs = arguments;
          lastThis = this;
          lastCallTime = time;
  
          if (isInvoking) {
            if (timerId === undefined) {
              return leadingEdge(lastCallTime);
            }
            if (maxing) {
              // Handle invocations in a tight loop.
              timerId = setTimeout(timerExpired, wait);
              return invokeFunc(lastCallTime);
            }
          }
          if (timerId === undefined) {
            timerId = setTimeout(timerExpired, wait);
          }
          return result;
        }
        debounced.cancel = cancel;
        debounced.flush = flush;
        return debounced;
      }
  
      /**
       * Defers invoking the `func` until the current call stack has cleared. Any
       * additional arguments are provided to `func` when it's invoked.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to defer.
       * @param {...*} [args] The arguments to invoke `func` with.
       * @returns {number} Returns the timer id.
       * @example
       *
       * _.defer(function(text) {
       *   console.log(text);
       * }, 'deferred');
       * // => Logs 'deferred' after one millisecond.
       */
      var defer = baseRest(function(func, args) {
        return baseDelay(func, 1, args);
      });
  
      /**
       * Invokes `func` after `wait` milliseconds. Any additional arguments are
       * provided to `func` when it's invoked.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to delay.
       * @param {number} wait The number of milliseconds to delay invocation.
       * @param {...*} [args] The arguments to invoke `func` with.
       * @returns {number} Returns the timer id.
       * @example
       *
       * _.delay(function(text) {
       *   console.log(text);
       * }, 1000, 'later');
       * // => Logs 'later' after one second.
       */
      var delay = baseRest(function(func, wait, args) {
        return baseDelay(func, toNumber(wait) || 0, args);
      });
  
      /**
       * Creates a function that invokes `func` with arguments reversed.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Function
       * @param {Function} func The function to flip arguments for.
       * @returns {Function} Returns the new flipped function.
       * @example
       *
       * var flipped = _.flip(function() {
       *   return _.toArray(arguments);
       * });
       *
       * flipped('a', 'b', 'c', 'd');
       * // => ['d', 'c', 'b', 'a']
       */
      function flip(func) {
        return createWrap(func, WRAP_FLIP_FLAG);
      }
  
      /**
       * Creates a function that memoizes the result of `func`. If `resolver` is
       * provided, it determines the cache key for storing the result based on the
       * arguments provided to the memoized function. By default, the first argument
       * provided to the memoized function is used as the map cache key. The `func`
       * is invoked with the `this` binding of the memoized function.
       *
       * **Note:** The cache is exposed as the `cache` property on the memoized
       * function. Its creation may be customized by replacing the `_.memoize.Cache`
       * constructor with one whose instances implement the
       * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
       * method interface of `clear`, `delete`, `get`, `has`, and `set`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to have its output memoized.
       * @param {Function} [resolver] The function to resolve the cache key.
       * @returns {Function} Returns the new memoized function.
       * @example
       *
       * var object = { 'a': 1, 'b': 2 };
       * var other = { 'c': 3, 'd': 4 };
       *
       * var values = _.memoize(_.values);
       * values(object);
       * // => [1, 2]
       *
       * values(other);
       * // => [3, 4]
       *
       * object.a = 2;
       * values(object);
       * // => [1, 2]
       *
       * // Modify the result cache.
       * values.cache.set(object, ['a', 'b']);
       * values(object);
       * // => ['a', 'b']
       *
       * // Replace `_.memoize.Cache`.
       * _.memoize.Cache = WeakMap;
       */
      function memoize(func, resolver) {
        if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        var memoized = function() {
          var args = arguments,
              key = resolver ? resolver.apply(this, args) : args[0],
              cache = memoized.cache;
  
          if (cache.has(key)) {
            return cache.get(key);
          }
          var result = func.apply(this, args);
          memoized.cache = cache.set(key, result) || cache;
          return result;
        };
        memoized.cache = new (memoize.Cache || MapCache);
        return memoized;
      }
  
      // Expose `MapCache`.
      memoize.Cache = MapCache;
  
      /**
       * Creates a function that negates the result of the predicate `func`. The
       * `func` predicate is invoked with the `this` binding and arguments of the
       * created function.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Function
       * @param {Function} predicate The predicate to negate.
       * @returns {Function} Returns the new negated function.
       * @example
       *
       * function isEven(n) {
       *   return n % 2 == 0;
       * }
       *
       * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
       * // => [1, 3, 5]
       */
      function negate(predicate) {
        if (typeof predicate != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        return function() {
          var args = arguments;
          switch (args.length) {
            case 0: return !predicate.call(this);
            case 1: return !predicate.call(this, args[0]);
            case 2: return !predicate.call(this, args[0], args[1]);
            case 3: return !predicate.call(this, args[0], args[1], args[2]);
          }
          return !predicate.apply(this, args);
        };
      }
  
      /**
       * Creates a function that is restricted to invoking `func` once. Repeat calls
       * to the function return the value of the first invocation. The `func` is
       * invoked with the `this` binding and arguments of the created function.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to restrict.
       * @returns {Function} Returns the new restricted function.
       * @example
       *
       * var initialize = _.once(createApplication);
       * initialize();
       * initialize();
       * // => `createApplication` is invoked once
       */
      function once(func) {
        return before(2, func);
      }
  
      /**
       * Creates a function that invokes `func` with its arguments transformed.
       *
       * @static
       * @since 4.0.0
       * @memberOf _
       * @category Function
       * @param {Function} func The function to wrap.
       * @param {...(Function|Function[])} [transforms=[_.identity]]
       *  The argument transforms.
       * @returns {Function} Returns the new function.
       * @example
       *
       * function doubled(n) {
       *   return n * 2;
       * }
       *
       * function square(n) {
       *   return n * n;
       * }
       *
       * var func = _.overArgs(function(x, y) {
       *   return [x, y];
       * }, [square, doubled]);
       *
       * func(9, 3);
       * // => [81, 6]
       *
       * func(10, 5);
       * // => [100, 10]
       */
      var overArgs = castRest(function(func, transforms) {
        transforms = (transforms.length == 1 && isArray(transforms[0]))
          ? arrayMap(transforms[0], baseUnary(getIteratee()))
          : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));
  
        var funcsLength = transforms.length;
        return baseRest(function(args) {
          var index = -1,
              length = nativeMin(args.length, funcsLength);
  
          while (++index < length) {
            args[index] = transforms[index].call(this, args[index]);
          }
          return apply(func, this, args);
        });
      });
  
      /**
       * Creates a function that invokes `func` with `partials` prepended to the
       * arguments it receives. This method is like `_.bind` except it does **not**
       * alter the `this` binding.
       *
       * The `_.partial.placeholder` value, which defaults to `_` in monolithic
       * builds, may be used as a placeholder for partially applied arguments.
       *
       * **Note:** This method doesn't set the "length" property of partially
       * applied functions.
       *
       * @static
       * @memberOf _
       * @since 0.2.0
       * @category Function
       * @param {Function} func The function to partially apply arguments to.
       * @param {...*} [partials] The arguments to be partially applied.
       * @returns {Function} Returns the new partially applied function.
       * @example
       *
       * function greet(greeting, name) {
       *   return greeting + ' ' + name;
       * }
       *
       * var sayHelloTo = _.partial(greet, 'hello');
       * sayHelloTo('fred');
       * // => 'hello fred'
       *
       * // Partially applied with placeholders.
       * var greetFred = _.partial(greet, _, 'fred');
       * greetFred('hi');
       * // => 'hi fred'
       */
      var partial = baseRest(function(func, partials) {
        var holders = replaceHolders(partials, getHolder(partial));
        return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders);
      });
  
      /**
       * This method is like `_.partial` except that partially applied arguments
       * are appended to the arguments it receives.
       *
       * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
       * builds, may be used as a placeholder for partially applied arguments.
       *
       * **Note:** This method doesn't set the "length" property of partially
       * applied functions.
       *
       * @static
       * @memberOf _
       * @since 1.0.0
       * @category Function
       * @param {Function} func The function to partially apply arguments to.
       * @param {...*} [partials] The arguments to be partially applied.
       * @returns {Function} Returns the new partially applied function.
       * @example
       *
       * function greet(greeting, name) {
       *   return greeting + ' ' + name;
       * }
       *
       * var greetFred = _.partialRight(greet, 'fred');
       * greetFred('hi');
       * // => 'hi fred'
       *
       * // Partially applied with placeholders.
       * var sayHelloTo = _.partialRight(greet, 'hello', _);
       * sayHelloTo('fred');
       * // => 'hello fred'
       */
      var partialRight = baseRest(function(func, partials) {
        var holders = replaceHolders(partials, getHolder(partialRight));
        return createWrap(func, WRAP_PARTIAL_RIGHT_FLAG, undefined, partials, holders);
      });
  
      /**
       * Creates a function that invokes `func` with arguments arranged according
       * to the specified `indexes` where the argument value at the first index is
       * provided as the first argument, the argument value at the second index is
       * provided as the second argument, and so on.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Function
       * @param {Function} func The function to rearrange arguments for.
       * @param {...(number|number[])} indexes The arranged argument indexes.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var rearged = _.rearg(function(a, b, c) {
       *   return [a, b, c];
       * }, [2, 0, 1]);
       *
       * rearged('b', 'c', 'a')
       * // => ['a', 'b', 'c']
       */
      var rearg = flatRest(function(func, indexes) {
        return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes);
      });
  
      /**
       * Creates a function that invokes `func` with the `this` binding of the
       * created function and arguments from `start` and beyond provided as
       * an array.
       *
       * **Note:** This method is based on the
       * [rest parameter](https://mdn.io/rest_parameters).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Function
       * @param {Function} func The function to apply a rest parameter to.
       * @param {number} [start=func.length-1] The start position of the rest parameter.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var say = _.rest(function(what, names) {
       *   return what + ' ' + _.initial(names).join(', ') +
       *     (_.size(names) > 1 ? ', & ' : '') + _.last(names);
       * });
       *
       * say('hello', 'fred', 'barney', 'pebbles');
       * // => 'hello fred, barney, & pebbles'
       */
      function rest(func, start) {
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        start = start === undefined ? start : toInteger(start);
        return baseRest(func, start);
      }
  
      /**
       * Creates a function that invokes `func` with the `this` binding of the
       * create function and an array of arguments much like
       * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).
       *
       * **Note:** This method is based on the
       * [spread operator](https://mdn.io/spread_operator).
       *
       * @static
       * @memberOf _
       * @since 3.2.0
       * @category Function
       * @param {Function} func The function to spread arguments over.
       * @param {number} [start=0] The start position of the spread.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var say = _.spread(function(who, what) {
       *   return who + ' says ' + what;
       * });
       *
       * say(['fred', 'hello']);
       * // => 'fred says hello'
       *
       * var numbers = Promise.all([
       *   Promise.resolve(40),
       *   Promise.resolve(36)
       * ]);
       *
       * numbers.then(_.spread(function(x, y) {
       *   return x + y;
       * }));
       * // => a Promise of 76
       */
      function spread(func, start) {
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        start = start == null ? 0 : nativeMax(toInteger(start), 0);
        return baseRest(function(args) {
          var array = args[start],
              otherArgs = castSlice(args, 0, start);
  
          if (array) {
            arrayPush(otherArgs, array);
          }
          return apply(func, this, otherArgs);
        });
      }
  
      /**
       * Creates a throttled function that only invokes `func` at most once per
       * every `wait` milliseconds. The throttled function comes with a `cancel`
       * method to cancel delayed `func` invocations and a `flush` method to
       * immediately invoke them. Provide `options` to indicate whether `func`
       * should be invoked on the leading and/or trailing edge of the `wait`
       * timeout. The `func` is invoked with the last arguments provided to the
       * throttled function. Subsequent calls to the throttled function return the
       * result of the last `func` invocation.
       *
       * **Note:** If `leading` and `trailing` options are `true`, `func` is
       * invoked on the trailing edge of the timeout only if the throttled function
       * is invoked more than once during the `wait` timeout.
       *
       * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
       * until to the next tick, similar to `setTimeout` with a timeout of `0`.
       *
       * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
       * for details over the differences between `_.throttle` and `_.debounce`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {Function} func The function to throttle.
       * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
       * @param {Object} [options={}] The options object.
       * @param {boolean} [options.leading=true]
       *  Specify invoking on the leading edge of the timeout.
       * @param {boolean} [options.trailing=true]
       *  Specify invoking on the trailing edge of the timeout.
       * @returns {Function} Returns the new throttled function.
       * @example
       *
       * // Avoid excessively updating the position while scrolling.
       * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
       *
       * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
       * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
       * jQuery(element).on('click', throttled);
       *
       * // Cancel the trailing throttled invocation.
       * jQuery(window).on('popstate', throttled.cancel);
       */
      function throttle(func, wait, options) {
        var leading = true,
            trailing = true;
  
        if (typeof func != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        if (isObject(options)) {
          leading = 'leading' in options ? !!options.leading : leading;
          trailing = 'trailing' in options ? !!options.trailing : trailing;
        }
        return debounce(func, wait, {
          'leading': leading,
          'maxWait': wait,
          'trailing': trailing
        });
      }
  
      /**
       * Creates a function that accepts up to one argument, ignoring any
       * additional arguments.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Function
       * @param {Function} func The function to cap arguments for.
       * @returns {Function} Returns the new capped function.
       * @example
       *
       * _.map(['6', '8', '10'], _.unary(parseInt));
       * // => [6, 8, 10]
       */
      function unary(func) {
        return ary(func, 1);
      }
  
      /**
       * Creates a function that provides `value` to `wrapper` as its first
       * argument. Any additional arguments provided to the function are appended
       * to those provided to the `wrapper`. The wrapper is invoked with the `this`
       * binding of the created function.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Function
       * @param {*} value The value to wrap.
       * @param {Function} [wrapper=identity] The wrapper function.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var p = _.wrap(_.escape, function(func, text) {
       *   return '<p>' + func(text) + '</p>';
       * });
       *
       * p('fred, barney, & pebbles');
       * // => '<p>fred, barney, &amp; pebbles</p>'
       */
      function wrap(value, wrapper) {
        return partial(castFunction(wrapper), value);
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Casts `value` as an array if it's not one.
       *
       * @static
       * @memberOf _
       * @since 4.4.0
       * @category Lang
       * @param {*} value The value to inspect.
       * @returns {Array} Returns the cast array.
       * @example
       *
       * _.castArray(1);
       * // => [1]
       *
       * _.castArray({ 'a': 1 });
       * // => [{ 'a': 1 }]
       *
       * _.castArray('abc');
       * // => ['abc']
       *
       * _.castArray(null);
       * // => [null]
       *
       * _.castArray(undefined);
       * // => [undefined]
       *
       * _.castArray();
       * // => []
       *
       * var array = [1, 2, 3];
       * console.log(_.castArray(array) === array);
       * // => true
       */
      function castArray() {
        if (!arguments.length) {
          return [];
        }
        var value = arguments[0];
        return isArray(value) ? value : [value];
      }
  
      /**
       * Creates a shallow clone of `value`.
       *
       * **Note:** This method is loosely based on the
       * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)
       * and supports cloning arrays, array buffers, booleans, date objects, maps,
       * numbers, `Object` objects, regexes, sets, strings, symbols, and typed
       * arrays. The own enumerable properties of `arguments` objects are cloned
       * as plain objects. An empty object is returned for uncloneable values such
       * as error objects, functions, DOM nodes, and WeakMaps.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to clone.
       * @returns {*} Returns the cloned value.
       * @see _.cloneDeep
       * @example
       *
       * var objects = [{ 'a': 1 }, { 'b': 2 }];
       *
       * var shallow = _.clone(objects);
       * console.log(shallow[0] === objects[0]);
       * // => true
       */
      function clone(value) {
        return baseClone(value, CLONE_SYMBOLS_FLAG);
      }
  
      /**
       * This method is like `_.clone` except that it accepts `customizer` which
       * is invoked to produce the cloned value. If `customizer` returns `undefined`,
       * cloning is handled by the method instead. The `customizer` is invoked with
       * up to four arguments; (value [, index|key, object, stack]).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to clone.
       * @param {Function} [customizer] The function to customize cloning.
       * @returns {*} Returns the cloned value.
       * @see _.cloneDeepWith
       * @example
       *
       * function customizer(value) {
       *   if (_.isElement(value)) {
       *     return value.cloneNode(false);
       *   }
       * }
       *
       * var el = _.cloneWith(document.body, customizer);
       *
       * console.log(el === document.body);
       * // => false
       * console.log(el.nodeName);
       * // => 'BODY'
       * console.log(el.childNodes.length);
       * // => 0
       */
      function cloneWith(value, customizer) {
        customizer = typeof customizer == 'function' ? customizer : undefined;
        return baseClone(value, CLONE_SYMBOLS_FLAG, customizer);
      }
  
      /**
       * This method is like `_.clone` except that it recursively clones `value`.
       *
       * @static
       * @memberOf _
       * @since 1.0.0
       * @category Lang
       * @param {*} value The value to recursively clone.
       * @returns {*} Returns the deep cloned value.
       * @see _.clone
       * @example
       *
       * var objects = [{ 'a': 1 }, { 'b': 2 }];
       *
       * var deep = _.cloneDeep(objects);
       * console.log(deep[0] === objects[0]);
       * // => false
       */
      function cloneDeep(value) {
        return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG);
      }
  
      /**
       * This method is like `_.cloneWith` except that it recursively clones `value`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to recursively clone.
       * @param {Function} [customizer] The function to customize cloning.
       * @returns {*} Returns the deep cloned value.
       * @see _.cloneWith
       * @example
       *
       * function customizer(value) {
       *   if (_.isElement(value)) {
       *     return value.cloneNode(true);
       *   }
       * }
       *
       * var el = _.cloneDeepWith(document.body, customizer);
       *
       * console.log(el === document.body);
       * // => false
       * console.log(el.nodeName);
       * // => 'BODY'
       * console.log(el.childNodes.length);
       * // => 20
       */
      function cloneDeepWith(value, customizer) {
        customizer = typeof customizer == 'function' ? customizer : undefined;
        return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer);
      }
  
      /**
       * Checks if `object` conforms to `source` by invoking the predicate
       * properties of `source` with the corresponding property values of `object`.
       *
       * **Note:** This method is equivalent to `_.conforms` when `source` is
       * partially applied.
       *
       * @static
       * @memberOf _
       * @since 4.14.0
       * @category Lang
       * @param {Object} object The object to inspect.
       * @param {Object} source The object of property predicates to conform to.
       * @returns {boolean} Returns `true` if `object` conforms, else `false`.
       * @example
       *
       * var object = { 'a': 1, 'b': 2 };
       *
       * _.conformsTo(object, { 'b': function(n) { return n > 1; } });
       * // => true
       *
       * _.conformsTo(object, { 'b': function(n) { return n > 2; } });
       * // => false
       */
      function conformsTo(object, source) {
        return source == null || baseConformsTo(object, source, keys(source));
      }
  
      /**
       * Performs a
       * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
       * comparison between two values to determine if they are equivalent.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
       * @example
       *
       * var object = { 'a': 1 };
       * var other = { 'a': 1 };
       *
       * _.eq(object, object);
       * // => true
       *
       * _.eq(object, other);
       * // => false
       *
       * _.eq('a', 'a');
       * // => true
       *
       * _.eq('a', Object('a'));
       * // => false
       *
       * _.eq(NaN, NaN);
       * // => true
       */
      function eq(value, other) {
        return value === other || (value !== value && other !== other);
      }
  
      /**
       * Checks if `value` is greater than `other`.
       *
       * @static
       * @memberOf _
       * @since 3.9.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if `value` is greater than `other`,
       *  else `false`.
       * @see _.lt
       * @example
       *
       * _.gt(3, 1);
       * // => true
       *
       * _.gt(3, 3);
       * // => false
       *
       * _.gt(1, 3);
       * // => false
       */
      var gt = createRelationalOperation(baseGt);
  
      /**
       * Checks if `value` is greater than or equal to `other`.
       *
       * @static
       * @memberOf _
       * @since 3.9.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if `value` is greater than or equal to
       *  `other`, else `false`.
       * @see _.lte
       * @example
       *
       * _.gte(3, 1);
       * // => true
       *
       * _.gte(3, 3);
       * // => true
       *
       * _.gte(1, 3);
       * // => false
       */
      var gte = createRelationalOperation(function(value, other) {
        return value >= other;
      });
  
      /**
       * Checks if `value` is likely an `arguments` object.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an `arguments` object,
       *  else `false`.
       * @example
       *
       * _.isArguments(function() { return arguments; }());
       * // => true
       *
       * _.isArguments([1, 2, 3]);
       * // => false
       */
      var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
        return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&
          !propertyIsEnumerable.call(value, 'callee');
      };
  
      /**
       * Checks if `value` is classified as an `Array` object.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an array, else `false`.
       * @example
       *
       * _.isArray([1, 2, 3]);
       * // => true
       *
       * _.isArray(document.body.children);
       * // => false
       *
       * _.isArray('abc');
       * // => false
       *
       * _.isArray(_.noop);
       * // => false
       */
      var isArray = Array.isArray;
  
      /**
       * Checks if `value` is classified as an `ArrayBuffer` object.
       *
       * @static
       * @memberOf _
       * @since 4.3.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
       * @example
       *
       * _.isArrayBuffer(new ArrayBuffer(2));
       * // => true
       *
       * _.isArrayBuffer(new Array(2));
       * // => false
       */
      var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer;
  
      /**
       * Checks if `value` is array-like. A value is considered array-like if it's
       * not a function and has a `value.length` that's an integer greater than or
       * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
       * @example
       *
       * _.isArrayLike([1, 2, 3]);
       * // => true
       *
       * _.isArrayLike(document.body.children);
       * // => true
       *
       * _.isArrayLike('abc');
       * // => true
       *
       * _.isArrayLike(_.noop);
       * // => false
       */
      function isArrayLike(value) {
        return value != null && isLength(value.length) && !isFunction(value);
      }
  
      /**
       * This method is like `_.isArrayLike` except that it also checks if `value`
       * is an object.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an array-like object,
       *  else `false`.
       * @example
       *
       * _.isArrayLikeObject([1, 2, 3]);
       * // => true
       *
       * _.isArrayLikeObject(document.body.children);
       * // => true
       *
       * _.isArrayLikeObject('abc');
       * // => false
       *
       * _.isArrayLikeObject(_.noop);
       * // => false
       */
      function isArrayLikeObject(value) {
        return isObjectLike(value) && isArrayLike(value);
      }
  
      /**
       * Checks if `value` is classified as a boolean primitive or object.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a boolean, else `false`.
       * @example
       *
       * _.isBoolean(false);
       * // => true
       *
       * _.isBoolean(null);
       * // => false
       */
      function isBoolean(value) {
        return value === true || value === false ||
          (isObjectLike(value) && baseGetTag(value) == boolTag);
      }
  
      /**
       * Checks if `value` is a buffer.
       *
       * @static
       * @memberOf _
       * @since 4.3.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
       * @example
       *
       * _.isBuffer(new Buffer(2));
       * // => true
       *
       * _.isBuffer(new Uint8Array(2));
       * // => false
       */
      var isBuffer = nativeIsBuffer || stubFalse;
  
      /**
       * Checks if `value` is classified as a `Date` object.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
       * @example
       *
       * _.isDate(new Date);
       * // => true
       *
       * _.isDate('Mon April 23 2012');
       * // => false
       */
      var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate;
  
      /**
       * Checks if `value` is likely a DOM element.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.
       * @example
       *
       * _.isElement(document.body);
       * // => true
       *
       * _.isElement('<body>');
       * // => false
       */
      function isElement(value) {
        return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);
      }
  
      /**
       * Checks if `value` is an empty object, collection, map, or set.
       *
       * Objects are considered empty if they have no own enumerable string keyed
       * properties.
       *
       * Array-like values such as `arguments` objects, arrays, buffers, strings, or
       * jQuery-like collections are considered empty if they have a `length` of `0`.
       * Similarly, maps and sets are considered empty if they have a `size` of `0`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is empty, else `false`.
       * @example
       *
       * _.isEmpty(null);
       * // => true
       *
       * _.isEmpty(true);
       * // => true
       *
       * _.isEmpty(1);
       * // => true
       *
       * _.isEmpty([1, 2, 3]);
       * // => false
       *
       * _.isEmpty({ 'a': 1 });
       * // => false
       */
      function isEmpty(value) {
        if (value == null) {
          return true;
        }
        if (isArrayLike(value) &&
            (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' ||
              isBuffer(value) || isTypedArray(value) || isArguments(value))) {
          return !value.length;
        }
        var tag = getTag(value);
        if (tag == mapTag || tag == setTag) {
          return !value.size;
        }
        if (isPrototype(value)) {
          return !baseKeys(value).length;
        }
        for (var key in value) {
          if (hasOwnProperty.call(value, key)) {
            return false;
          }
        }
        return true;
      }
  
      /**
       * Performs a deep comparison between two values to determine if they are
       * equivalent.
       *
       * **Note:** This method supports comparing arrays, array buffers, booleans,
       * date objects, error objects, maps, numbers, `Object` objects, regexes,
       * sets, strings, symbols, and typed arrays. `Object` objects are compared
       * by their own, not inherited, enumerable properties. Functions and DOM
       * nodes are compared by strict equality, i.e. `===`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
       * @example
       *
       * var object = { 'a': 1 };
       * var other = { 'a': 1 };
       *
       * _.isEqual(object, other);
       * // => true
       *
       * object === other;
       * // => false
       */
      function isEqual(value, other) {
        return baseIsEqual(value, other);
      }
  
      /**
       * This method is like `_.isEqual` except that it accepts `customizer` which
       * is invoked to compare values. If `customizer` returns `undefined`, comparisons
       * are handled by the method instead. The `customizer` is invoked with up to
       * six arguments: (objValue, othValue [, index|key, object, other, stack]).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @param {Function} [customizer] The function to customize comparisons.
       * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
       * @example
       *
       * function isGreeting(value) {
       *   return /^h(?:i|ello)$/.test(value);
       * }
       *
       * function customizer(objValue, othValue) {
       *   if (isGreeting(objValue) && isGreeting(othValue)) {
       *     return true;
       *   }
       * }
       *
       * var array = ['hello', 'goodbye'];
       * var other = ['hi', 'goodbye'];
       *
       * _.isEqualWith(array, other, customizer);
       * // => true
       */
      function isEqualWith(value, other, customizer) {
        customizer = typeof customizer == 'function' ? customizer : undefined;
        var result = customizer ? customizer(value, other) : undefined;
        return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;
      }
  
      /**
       * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
       * `SyntaxError`, `TypeError`, or `URIError` object.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an error object, else `false`.
       * @example
       *
       * _.isError(new Error);
       * // => true
       *
       * _.isError(Error);
       * // => false
       */
      function isError(value) {
        if (!isObjectLike(value)) {
          return false;
        }
        var tag = baseGetTag(value);
        return tag == errorTag || tag == domExcTag ||
          (typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value));
      }
  
      /**
       * Checks if `value` is a finite primitive number.
       *
       * **Note:** This method is based on
       * [`Number.isFinite`](https://mdn.io/Number/isFinite).
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.
       * @example
       *
       * _.isFinite(3);
       * // => true
       *
       * _.isFinite(Number.MIN_VALUE);
       * // => true
       *
       * _.isFinite(Infinity);
       * // => false
       *
       * _.isFinite('3');
       * // => false
       */
      function isFinite(value) {
        return typeof value == 'number' && nativeIsFinite(value);
      }
  
      /**
       * Checks if `value` is classified as a `Function` object.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a function, else `false`.
       * @example
       *
       * _.isFunction(_);
       * // => true
       *
       * _.isFunction(/abc/);
       * // => false
       */
      function isFunction(value) {
        if (!isObject(value)) {
          return false;
        }
        // The use of `Object#toString` avoids issues with the `typeof` operator
        // in Safari 9 which returns 'object' for typed arrays and other constructors.
        var tag = baseGetTag(value);
        return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
      }
  
      /**
       * Checks if `value` is an integer.
       *
       * **Note:** This method is based on
       * [`Number.isInteger`](https://mdn.io/Number/isInteger).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an integer, else `false`.
       * @example
       *
       * _.isInteger(3);
       * // => true
       *
       * _.isInteger(Number.MIN_VALUE);
       * // => false
       *
       * _.isInteger(Infinity);
       * // => false
       *
       * _.isInteger('3');
       * // => false
       */
      function isInteger(value) {
        return typeof value == 'number' && value == toInteger(value);
      }
  
      /**
       * Checks if `value` is a valid array-like length.
       *
       * **Note:** This method is loosely based on
       * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
       * @example
       *
       * _.isLength(3);
       * // => true
       *
       * _.isLength(Number.MIN_VALUE);
       * // => false
       *
       * _.isLength(Infinity);
       * // => false
       *
       * _.isLength('3');
       * // => false
       */
      function isLength(value) {
        return typeof value == 'number' &&
          value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
      }
  
      /**
       * Checks if `value` is the
       * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
       * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is an object, else `false`.
       * @example
       *
       * _.isObject({});
       * // => true
       *
       * _.isObject([1, 2, 3]);
       * // => true
       *
       * _.isObject(_.noop);
       * // => true
       *
       * _.isObject(null);
       * // => false
       */
      function isObject(value) {
        var type = typeof value;
        return value != null && (type == 'object' || type == 'function');
      }
  
      /**
       * Checks if `value` is object-like. A value is object-like if it's not `null`
       * and has a `typeof` result of "object".
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
       * @example
       *
       * _.isObjectLike({});
       * // => true
       *
       * _.isObjectLike([1, 2, 3]);
       * // => true
       *
       * _.isObjectLike(_.noop);
       * // => false
       *
       * _.isObjectLike(null);
       * // => false
       */
      function isObjectLike(value) {
        return value != null && typeof value == 'object';
      }
  
      /**
       * Checks if `value` is classified as a `Map` object.
       *
       * @static
       * @memberOf _
       * @since 4.3.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a map, else `false`.
       * @example
       *
       * _.isMap(new Map);
       * // => true
       *
       * _.isMap(new WeakMap);
       * // => false
       */
      var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;
  
      /**
       * Performs a partial deep comparison between `object` and `source` to
       * determine if `object` contains equivalent property values.
       *
       * **Note:** This method is equivalent to `_.matches` when `source` is
       * partially applied.
       *
       * Partial comparisons will match empty array and empty object `source`
       * values against any array or object value, respectively. See `_.isEqual`
       * for a list of supported value comparisons.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Lang
       * @param {Object} object The object to inspect.
       * @param {Object} source The object of property values to match.
       * @returns {boolean} Returns `true` if `object` is a match, else `false`.
       * @example
       *
       * var object = { 'a': 1, 'b': 2 };
       *
       * _.isMatch(object, { 'b': 2 });
       * // => true
       *
       * _.isMatch(object, { 'b': 1 });
       * // => false
       */
      function isMatch(object, source) {
        return object === source || baseIsMatch(object, source, getMatchData(source));
      }
  
      /**
       * This method is like `_.isMatch` except that it accepts `customizer` which
       * is invoked to compare values. If `customizer` returns `undefined`, comparisons
       * are handled by the method instead. The `customizer` is invoked with five
       * arguments: (objValue, srcValue, index|key, object, source).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {Object} object The object to inspect.
       * @param {Object} source The object of property values to match.
       * @param {Function} [customizer] The function to customize comparisons.
       * @returns {boolean} Returns `true` if `object` is a match, else `false`.
       * @example
       *
       * function isGreeting(value) {
       *   return /^h(?:i|ello)$/.test(value);
       * }
       *
       * function customizer(objValue, srcValue) {
       *   if (isGreeting(objValue) && isGreeting(srcValue)) {
       *     return true;
       *   }
       * }
       *
       * var object = { 'greeting': 'hello' };
       * var source = { 'greeting': 'hi' };
       *
       * _.isMatchWith(object, source, customizer);
       * // => true
       */
      function isMatchWith(object, source, customizer) {
        customizer = typeof customizer == 'function' ? customizer : undefined;
        return baseIsMatch(object, source, getMatchData(source), customizer);
      }
  
      /**
       * Checks if `value` is `NaN`.
       *
       * **Note:** This method is based on
       * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
       * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
       * `undefined` and other non-number values.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
       * @example
       *
       * _.isNaN(NaN);
       * // => true
       *
       * _.isNaN(new Number(NaN));
       * // => true
       *
       * isNaN(undefined);
       * // => true
       *
       * _.isNaN(undefined);
       * // => false
       */
      function isNaN(value) {
        // An `NaN` primitive is the only value that is not equal to itself.
        // Perform the `toStringTag` check first to avoid errors with some
        // ActiveX objects in IE.
        return isNumber(value) && value != +value;
      }
  
      /**
       * Checks if `value` is a pristine native function.
       *
       * **Note:** This method can't reliably detect native functions in the presence
       * of the core-js package because core-js circumvents this kind of detection.
       * Despite multiple requests, the core-js maintainer has made it clear: any
       * attempt to fix the detection will be obstructed. As a result, we're left
       * with little choice but to throw an error. Unfortunately, this also affects
       * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
       * which rely on core-js.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a native function,
       *  else `false`.
       * @example
       *
       * _.isNative(Array.prototype.push);
       * // => true
       *
       * _.isNative(_);
       * // => false
       */
      function isNative(value) {
        if (isMaskable(value)) {
          throw new Error(CORE_ERROR_TEXT);
        }
        return baseIsNative(value);
      }
  
      /**
       * Checks if `value` is `null`.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is `null`, else `false`.
       * @example
       *
       * _.isNull(null);
       * // => true
       *
       * _.isNull(void 0);
       * // => false
       */
      function isNull(value) {
        return value === null;
      }
  
      /**
       * Checks if `value` is `null` or `undefined`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is nullish, else `false`.
       * @example
       *
       * _.isNil(null);
       * // => true
       *
       * _.isNil(void 0);
       * // => true
       *
       * _.isNil(NaN);
       * // => false
       */
      function isNil(value) {
        return value == null;
      }
  
      /**
       * Checks if `value` is classified as a `Number` primitive or object.
       *
       * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
       * classified as numbers, use the `_.isFinite` method.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a number, else `false`.
       * @example
       *
       * _.isNumber(3);
       * // => true
       *
       * _.isNumber(Number.MIN_VALUE);
       * // => true
       *
       * _.isNumber(Infinity);
       * // => true
       *
       * _.isNumber('3');
       * // => false
       */
      function isNumber(value) {
        return typeof value == 'number' ||
          (isObjectLike(value) && baseGetTag(value) == numberTag);
      }
  
      /**
       * Checks if `value` is a plain object, that is, an object created by the
       * `Object` constructor or one with a `[[Prototype]]` of `null`.
       *
       * @static
       * @memberOf _
       * @since 0.8.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       * }
       *
       * _.isPlainObject(new Foo);
       * // => false
       *
       * _.isPlainObject([1, 2, 3]);
       * // => false
       *
       * _.isPlainObject({ 'x': 0, 'y': 0 });
       * // => true
       *
       * _.isPlainObject(Object.create(null));
       * // => true
       */
      function isPlainObject(value) {
        if (!isObjectLike(value) || baseGetTag(value) != objectTag) {
          return false;
        }
        var proto = getPrototype(value);
        if (proto === null) {
          return true;
        }
        var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;
        return typeof Ctor == 'function' && Ctor instanceof Ctor &&
          funcToString.call(Ctor) == objectCtorString;
      }
  
      /**
       * Checks if `value` is classified as a `RegExp` object.
       *
       * @static
       * @memberOf _
       * @since 0.1.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
       * @example
       *
       * _.isRegExp(/abc/);
       * // => true
       *
       * _.isRegExp('/abc/');
       * // => false
       */
      var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp;
  
      /**
       * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754
       * double precision number which isn't the result of a rounded unsafe integer.
       *
       * **Note:** This method is based on
       * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
       * @example
       *
       * _.isSafeInteger(3);
       * // => true
       *
       * _.isSafeInteger(Number.MIN_VALUE);
       * // => false
       *
       * _.isSafeInteger(Infinity);
       * // => false
       *
       * _.isSafeInteger('3');
       * // => false
       */
      function isSafeInteger(value) {
        return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;
      }
  
      /**
       * Checks if `value` is classified as a `Set` object.
       *
       * @static
       * @memberOf _
       * @since 4.3.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a set, else `false`.
       * @example
       *
       * _.isSet(new Set);
       * // => true
       *
       * _.isSet(new WeakSet);
       * // => false
       */
      var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;
  
      /**
       * Checks if `value` is classified as a `String` primitive or object.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a string, else `false`.
       * @example
       *
       * _.isString('abc');
       * // => true
       *
       * _.isString(1);
       * // => false
       */
      function isString(value) {
        return typeof value == 'string' ||
          (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag);
      }
  
      /**
       * Checks if `value` is classified as a `Symbol` primitive or object.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
       * @example
       *
       * _.isSymbol(Symbol.iterator);
       * // => true
       *
       * _.isSymbol('abc');
       * // => false
       */
      function isSymbol(value) {
        return typeof value == 'symbol' ||
          (isObjectLike(value) && baseGetTag(value) == symbolTag);
      }
  
      /**
       * Checks if `value` is classified as a typed array.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
       * @example
       *
       * _.isTypedArray(new Uint8Array);
       * // => true
       *
       * _.isTypedArray([]);
       * // => false
       */
      var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;
  
      /**
       * Checks if `value` is `undefined`.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
       * @example
       *
       * _.isUndefined(void 0);
       * // => true
       *
       * _.isUndefined(null);
       * // => false
       */
      function isUndefined(value) {
        return value === undefined;
      }
  
      /**
       * Checks if `value` is classified as a `WeakMap` object.
       *
       * @static
       * @memberOf _
       * @since 4.3.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a weak map, else `false`.
       * @example
       *
       * _.isWeakMap(new WeakMap);
       * // => true
       *
       * _.isWeakMap(new Map);
       * // => false
       */
      function isWeakMap(value) {
        return isObjectLike(value) && getTag(value) == weakMapTag;
      }
  
      /**
       * Checks if `value` is classified as a `WeakSet` object.
       *
       * @static
       * @memberOf _
       * @since 4.3.0
       * @category Lang
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is a weak set, else `false`.
       * @example
       *
       * _.isWeakSet(new WeakSet);
       * // => true
       *
       * _.isWeakSet(new Set);
       * // => false
       */
      function isWeakSet(value) {
        return isObjectLike(value) && baseGetTag(value) == weakSetTag;
      }
  
      /**
       * Checks if `value` is less than `other`.
       *
       * @static
       * @memberOf _
       * @since 3.9.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if `value` is less than `other`,
       *  else `false`.
       * @see _.gt
       * @example
       *
       * _.lt(1, 3);
       * // => true
       *
       * _.lt(3, 3);
       * // => false
       *
       * _.lt(3, 1);
       * // => false
       */
      var lt = createRelationalOperation(baseLt);
  
      /**
       * Checks if `value` is less than or equal to `other`.
       *
       * @static
       * @memberOf _
       * @since 3.9.0
       * @category Lang
       * @param {*} value The value to compare.
       * @param {*} other The other value to compare.
       * @returns {boolean} Returns `true` if `value` is less than or equal to
       *  `other`, else `false`.
       * @see _.gte
       * @example
       *
       * _.lte(1, 3);
       * // => true
       *
       * _.lte(3, 3);
       * // => true
       *
       * _.lte(3, 1);
       * // => false
       */
      var lte = createRelationalOperation(function(value, other) {
        return value <= other;
      });
  
      /**
       * Converts `value` to an array.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {Array} Returns the converted array.
       * @example
       *
       * _.toArray({ 'a': 1, 'b': 2 });
       * // => [1, 2]
       *
       * _.toArray('abc');
       * // => ['a', 'b', 'c']
       *
       * _.toArray(1);
       * // => []
       *
       * _.toArray(null);
       * // => []
       */
      function toArray(value) {
        if (!value) {
          return [];
        }
        if (isArrayLike(value)) {
          return isString(value) ? stringToArray(value) : copyArray(value);
        }
        if (symIterator && value[symIterator]) {
          return iteratorToArray(value[symIterator]());
        }
        var tag = getTag(value),
            func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values);
  
        return func(value);
      }
  
      /**
       * Converts `value` to a finite number.
       *
       * @static
       * @memberOf _
       * @since 4.12.0
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {number} Returns the converted number.
       * @example
       *
       * _.toFinite(3.2);
       * // => 3.2
       *
       * _.toFinite(Number.MIN_VALUE);
       * // => 5e-324
       *
       * _.toFinite(Infinity);
       * // => 1.7976931348623157e+308
       *
       * _.toFinite('3.2');
       * // => 3.2
       */
      function toFinite(value) {
        if (!value) {
          return value === 0 ? value : 0;
        }
        value = toNumber(value);
        if (value === INFINITY || value === -INFINITY) {
          var sign = (value < 0 ? -1 : 1);
          return sign * MAX_INTEGER;
        }
        return value === value ? value : 0;
      }
  
      /**
       * Converts `value` to an integer.
       *
       * **Note:** This method is loosely based on
       * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {number} Returns the converted integer.
       * @example
       *
       * _.toInteger(3.2);
       * // => 3
       *
       * _.toInteger(Number.MIN_VALUE);
       * // => 0
       *
       * _.toInteger(Infinity);
       * // => 1.7976931348623157e+308
       *
       * _.toInteger('3.2');
       * // => 3
       */
      function toInteger(value) {
        var result = toFinite(value),
            remainder = result % 1;
  
        return result === result ? (remainder ? result - remainder : result) : 0;
      }
  
      /**
       * Converts `value` to an integer suitable for use as the length of an
       * array-like object.
       *
       * **Note:** This method is based on
       * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {number} Returns the converted integer.
       * @example
       *
       * _.toLength(3.2);
       * // => 3
       *
       * _.toLength(Number.MIN_VALUE);
       * // => 0
       *
       * _.toLength(Infinity);
       * // => 4294967295
       *
       * _.toLength('3.2');
       * // => 3
       */
      function toLength(value) {
        return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;
      }
  
      /**
       * Converts `value` to a number.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to process.
       * @returns {number} Returns the number.
       * @example
       *
       * _.toNumber(3.2);
       * // => 3.2
       *
       * _.toNumber(Number.MIN_VALUE);
       * // => 5e-324
       *
       * _.toNumber(Infinity);
       * // => Infinity
       *
       * _.toNumber('3.2');
       * // => 3.2
       */
      function toNumber(value) {
        if (typeof value == 'number') {
          return value;
        }
        if (isSymbol(value)) {
          return NAN;
        }
        if (isObject(value)) {
          var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
          value = isObject(other) ? (other + '') : other;
        }
        if (typeof value != 'string') {
          return value === 0 ? value : +value;
        }
        value = value.replace(reTrim, '');
        var isBinary = reIsBinary.test(value);
        return (isBinary || reIsOctal.test(value))
          ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
          : (reIsBadHex.test(value) ? NAN : +value);
      }
  
      /**
       * Converts `value` to a plain object flattening inherited enumerable string
       * keyed properties of `value` to own properties of the plain object.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {Object} Returns the converted plain object.
       * @example
       *
       * function Foo() {
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.assign({ 'a': 1 }, new Foo);
       * // => { 'a': 1, 'b': 2 }
       *
       * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
       * // => { 'a': 1, 'b': 2, 'c': 3 }
       */
      function toPlainObject(value) {
        return copyObject(value, keysIn(value));
      }
  
      /**
       * Converts `value` to a safe integer. A safe integer can be compared and
       * represented correctly.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {number} Returns the converted integer.
       * @example
       *
       * _.toSafeInteger(3.2);
       * // => 3
       *
       * _.toSafeInteger(Number.MIN_VALUE);
       * // => 0
       *
       * _.toSafeInteger(Infinity);
       * // => 9007199254740991
       *
       * _.toSafeInteger('3.2');
       * // => 3
       */
      function toSafeInteger(value) {
        return value
          ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER)
          : (value === 0 ? value : 0);
      }
  
      /**
       * Converts `value` to a string. An empty string is returned for `null`
       * and `undefined` values. The sign of `-0` is preserved.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Lang
       * @param {*} value The value to convert.
       * @returns {string} Returns the converted string.
       * @example
       *
       * _.toString(null);
       * // => ''
       *
       * _.toString(-0);
       * // => '-0'
       *
       * _.toString([1, 2, 3]);
       * // => '1,2,3'
       */
      function toString(value) {
        return value == null ? '' : baseToString(value);
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Assigns own enumerable string keyed properties of source objects to the
       * destination object. Source objects are applied from left to right.
       * Subsequent sources overwrite property assignments of previous sources.
       *
       * **Note:** This method mutates `object` and is loosely based on
       * [`Object.assign`](https://mdn.io/Object/assign).
       *
       * @static
       * @memberOf _
       * @since 0.10.0
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} [sources] The source objects.
       * @returns {Object} Returns `object`.
       * @see _.assignIn
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       * }
       *
       * function Bar() {
       *   this.c = 3;
       * }
       *
       * Foo.prototype.b = 2;
       * Bar.prototype.d = 4;
       *
       * _.assign({ 'a': 0 }, new Foo, new Bar);
       * // => { 'a': 1, 'c': 3 }
       */
      var assign = createAssigner(function(object, source) {
        if (isPrototype(source) || isArrayLike(source)) {
          copyObject(source, keys(source), object);
          return;
        }
        for (var key in source) {
          if (hasOwnProperty.call(source, key)) {
            assignValue(object, key, source[key]);
          }
        }
      });
  
      /**
       * This method is like `_.assign` except that it iterates over own and
       * inherited source properties.
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @alias extend
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} [sources] The source objects.
       * @returns {Object} Returns `object`.
       * @see _.assign
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       * }
       *
       * function Bar() {
       *   this.c = 3;
       * }
       *
       * Foo.prototype.b = 2;
       * Bar.prototype.d = 4;
       *
       * _.assignIn({ 'a': 0 }, new Foo, new Bar);
       * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
       */
      var assignIn = createAssigner(function(object, source) {
        copyObject(source, keysIn(source), object);
      });
  
      /**
       * This method is like `_.assignIn` except that it accepts `customizer`
       * which is invoked to produce the assigned values. If `customizer` returns
       * `undefined`, assignment is handled by the method instead. The `customizer`
       * is invoked with five arguments: (objValue, srcValue, key, object, source).
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @alias extendWith
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} sources The source objects.
       * @param {Function} [customizer] The function to customize assigned values.
       * @returns {Object} Returns `object`.
       * @see _.assignWith
       * @example
       *
       * function customizer(objValue, srcValue) {
       *   return _.isUndefined(objValue) ? srcValue : objValue;
       * }
       *
       * var defaults = _.partialRight(_.assignInWith, customizer);
       *
       * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
       * // => { 'a': 1, 'b': 2 }
       */
      var assignInWith = createAssigner(function(object, source, srcIndex, customizer) {
        copyObject(source, keysIn(source), object, customizer);
      });
  
      /**
       * This method is like `_.assign` except that it accepts `customizer`
       * which is invoked to produce the assigned values. If `customizer` returns
       * `undefined`, assignment is handled by the method instead. The `customizer`
       * is invoked with five arguments: (objValue, srcValue, key, object, source).
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} sources The source objects.
       * @param {Function} [customizer] The function to customize assigned values.
       * @returns {Object} Returns `object`.
       * @see _.assignInWith
       * @example
       *
       * function customizer(objValue, srcValue) {
       *   return _.isUndefined(objValue) ? srcValue : objValue;
       * }
       *
       * var defaults = _.partialRight(_.assignWith, customizer);
       *
       * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
       * // => { 'a': 1, 'b': 2 }
       */
      var assignWith = createAssigner(function(object, source, srcIndex, customizer) {
        copyObject(source, keys(source), object, customizer);
      });
  
      /**
       * Creates an array of values corresponding to `paths` of `object`.
       *
       * @static
       * @memberOf _
       * @since 1.0.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {...(string|string[])} [paths] The property paths to pick.
       * @returns {Array} Returns the picked values.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
       *
       * _.at(object, ['a[0].b.c', 'a[1]']);
       * // => [3, 4]
       */
      var at = flatRest(baseAt);
  
      /**
       * Creates an object that inherits from the `prototype` object. If a
       * `properties` object is given, its own enumerable string keyed properties
       * are assigned to the created object.
       *
       * @static
       * @memberOf _
       * @since 2.3.0
       * @category Object
       * @param {Object} prototype The object to inherit from.
       * @param {Object} [properties] The properties to assign to the object.
       * @returns {Object} Returns the new object.
       * @example
       *
       * function Shape() {
       *   this.x = 0;
       *   this.y = 0;
       * }
       *
       * function Circle() {
       *   Shape.call(this);
       * }
       *
       * Circle.prototype = _.create(Shape.prototype, {
       *   'constructor': Circle
       * });
       *
       * var circle = new Circle;
       * circle instanceof Circle;
       * // => true
       *
       * circle instanceof Shape;
       * // => true
       */
      function create(prototype, properties) {
        var result = baseCreate(prototype);
        return properties == null ? result : baseAssign(result, properties);
      }
  
      /**
       * Assigns own and inherited enumerable string keyed properties of source
       * objects to the destination object for all destination properties that
       * resolve to `undefined`. Source objects are applied from left to right.
       * Once a property is set, additional values of the same property are ignored.
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} [sources] The source objects.
       * @returns {Object} Returns `object`.
       * @see _.defaultsDeep
       * @example
       *
       * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
       * // => { 'a': 1, 'b': 2 }
       */
      var defaults = baseRest(function(args) {
        args.push(undefined, customDefaultsAssignIn);
        return apply(assignInWith, undefined, args);
      });
  
      /**
       * This method is like `_.defaults` except that it recursively assigns
       * default properties.
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 3.10.0
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} [sources] The source objects.
       * @returns {Object} Returns `object`.
       * @see _.defaults
       * @example
       *
       * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });
       * // => { 'a': { 'b': 2, 'c': 3 } }
       */
      var defaultsDeep = baseRest(function(args) {
        args.push(undefined, customDefaultsMerge);
        return apply(mergeWith, undefined, args);
      });
  
      /**
       * This method is like `_.find` except that it returns the key of the first
       * element `predicate` returns truthy for instead of the element itself.
       *
       * @static
       * @memberOf _
       * @since 1.1.0
       * @category Object
       * @param {Object} object The object to inspect.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {string|undefined} Returns the key of the matched element,
       *  else `undefined`.
       * @example
       *
       * var users = {
       *   'barney':  { 'age': 36, 'active': true },
       *   'fred':    { 'age': 40, 'active': false },
       *   'pebbles': { 'age': 1,  'active': true }
       * };
       *
       * _.findKey(users, function(o) { return o.age < 40; });
       * // => 'barney' (iteration order is not guaranteed)
       *
       * // The `_.matches` iteratee shorthand.
       * _.findKey(users, { 'age': 1, 'active': true });
       * // => 'pebbles'
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.findKey(users, ['active', false]);
       * // => 'fred'
       *
       * // The `_.property` iteratee shorthand.
       * _.findKey(users, 'active');
       * // => 'barney'
       */
      function findKey(object, predicate) {
        return baseFindKey(object, getIteratee(predicate, 3), baseForOwn);
      }
  
      /**
       * This method is like `_.findKey` except that it iterates over elements of
       * a collection in the opposite order.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Object
       * @param {Object} object The object to inspect.
       * @param {Function} [predicate=_.identity] The function invoked per iteration.
       * @returns {string|undefined} Returns the key of the matched element,
       *  else `undefined`.
       * @example
       *
       * var users = {
       *   'barney':  { 'age': 36, 'active': true },
       *   'fred':    { 'age': 40, 'active': false },
       *   'pebbles': { 'age': 1,  'active': true }
       * };
       *
       * _.findLastKey(users, function(o) { return o.age < 40; });
       * // => returns 'pebbles' assuming `_.findKey` returns 'barney'
       *
       * // The `_.matches` iteratee shorthand.
       * _.findLastKey(users, { 'age': 36, 'active': true });
       * // => 'barney'
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.findLastKey(users, ['active', false]);
       * // => 'fred'
       *
       * // The `_.property` iteratee shorthand.
       * _.findLastKey(users, 'active');
       * // => 'pebbles'
       */
      function findLastKey(object, predicate) {
        return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight);
      }
  
      /**
       * Iterates over own and inherited enumerable string keyed properties of an
       * object and invokes `iteratee` for each property. The iteratee is invoked
       * with three arguments: (value, key, object). Iteratee functions may exit
       * iteration early by explicitly returning `false`.
       *
       * @static
       * @memberOf _
       * @since 0.3.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Object} Returns `object`.
       * @see _.forInRight
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.forIn(new Foo, function(value, key) {
       *   console.log(key);
       * });
       * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed).
       */
      function forIn(object, iteratee) {
        return object == null
          ? object
          : baseFor(object, getIteratee(iteratee, 3), keysIn);
      }
  
      /**
       * This method is like `_.forIn` except that it iterates over properties of
       * `object` in the opposite order.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Object} Returns `object`.
       * @see _.forIn
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.forInRight(new Foo, function(value, key) {
       *   console.log(key);
       * });
       * // => Logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'.
       */
      function forInRight(object, iteratee) {
        return object == null
          ? object
          : baseForRight(object, getIteratee(iteratee, 3), keysIn);
      }
  
      /**
       * Iterates over own enumerable string keyed properties of an object and
       * invokes `iteratee` for each property. The iteratee is invoked with three
       * arguments: (value, key, object). Iteratee functions may exit iteration
       * early by explicitly returning `false`.
       *
       * @static
       * @memberOf _
       * @since 0.3.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Object} Returns `object`.
       * @see _.forOwnRight
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.forOwn(new Foo, function(value, key) {
       *   console.log(key);
       * });
       * // => Logs 'a' then 'b' (iteration order is not guaranteed).
       */
      function forOwn(object, iteratee) {
        return object && baseForOwn(object, getIteratee(iteratee, 3));
      }
  
      /**
       * This method is like `_.forOwn` except that it iterates over properties of
       * `object` in the opposite order.
       *
       * @static
       * @memberOf _
       * @since 2.0.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Object} Returns `object`.
       * @see _.forOwn
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.forOwnRight(new Foo, function(value, key) {
       *   console.log(key);
       * });
       * // => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'.
       */
      function forOwnRight(object, iteratee) {
        return object && baseForOwnRight(object, getIteratee(iteratee, 3));
      }
  
      /**
       * Creates an array of function property names from own enumerable properties
       * of `object`.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The object to inspect.
       * @returns {Array} Returns the function names.
       * @see _.functionsIn
       * @example
       *
       * function Foo() {
       *   this.a = _.constant('a');
       *   this.b = _.constant('b');
       * }
       *
       * Foo.prototype.c = _.constant('c');
       *
       * _.functions(new Foo);
       * // => ['a', 'b']
       */
      function functions(object) {
        return object == null ? [] : baseFunctions(object, keys(object));
      }
  
      /**
       * Creates an array of function property names from own and inherited
       * enumerable properties of `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The object to inspect.
       * @returns {Array} Returns the function names.
       * @see _.functions
       * @example
       *
       * function Foo() {
       *   this.a = _.constant('a');
       *   this.b = _.constant('b');
       * }
       *
       * Foo.prototype.c = _.constant('c');
       *
       * _.functionsIn(new Foo);
       * // => ['a', 'b', 'c']
       */
      function functionsIn(object) {
        return object == null ? [] : baseFunctions(object, keysIn(object));
      }
  
      /**
       * Gets the value at `path` of `object`. If the resolved value is
       * `undefined`, the `defaultValue` is returned in its place.
       *
       * @static
       * @memberOf _
       * @since 3.7.0
       * @category Object
       * @param {Object} object The object to query.
       * @param {Array|string} path The path of the property to get.
       * @param {*} [defaultValue] The value returned for `undefined` resolved values.
       * @returns {*} Returns the resolved value.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': 3 } }] };
       *
       * _.get(object, 'a[0].b.c');
       * // => 3
       *
       * _.get(object, ['a', '0', 'b', 'c']);
       * // => 3
       *
       * _.get(object, 'a.b.c', 'default');
       * // => 'default'
       */
      function get(object, path, defaultValue) {
        var result = object == null ? undefined : baseGet(object, path);
        return result === undefined ? defaultValue : result;
      }
  
      /**
       * Checks if `path` is a direct property of `object`.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The object to query.
       * @param {Array|string} path The path to check.
       * @returns {boolean} Returns `true` if `path` exists, else `false`.
       * @example
       *
       * var object = { 'a': { 'b': 2 } };
       * var other = _.create({ 'a': _.create({ 'b': 2 }) });
       *
       * _.has(object, 'a');
       * // => true
       *
       * _.has(object, 'a.b');
       * // => true
       *
       * _.has(object, ['a', 'b']);
       * // => true
       *
       * _.has(other, 'a');
       * // => false
       */
      function has(object, path) {
        return object != null && hasPath(object, path, baseHas);
      }
  
      /**
       * Checks if `path` is a direct or inherited property of `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The object to query.
       * @param {Array|string} path The path to check.
       * @returns {boolean} Returns `true` if `path` exists, else `false`.
       * @example
       *
       * var object = _.create({ 'a': _.create({ 'b': 2 }) });
       *
       * _.hasIn(object, 'a');
       * // => true
       *
       * _.hasIn(object, 'a.b');
       * // => true
       *
       * _.hasIn(object, ['a', 'b']);
       * // => true
       *
       * _.hasIn(object, 'b');
       * // => false
       */
      function hasIn(object, path) {
        return object != null && hasPath(object, path, baseHasIn);
      }
  
      /**
       * Creates an object composed of the inverted keys and values of `object`.
       * If `object` contains duplicate values, subsequent values overwrite
       * property assignments of previous values.
       *
       * @static
       * @memberOf _
       * @since 0.7.0
       * @category Object
       * @param {Object} object The object to invert.
       * @returns {Object} Returns the new inverted object.
       * @example
       *
       * var object = { 'a': 1, 'b': 2, 'c': 1 };
       *
       * _.invert(object);
       * // => { '1': 'c', '2': 'b' }
       */
      var invert = createInverter(function(result, value, key) {
        result[value] = key;
      }, constant(identity));
  
      /**
       * This method is like `_.invert` except that the inverted object is generated
       * from the results of running each element of `object` thru `iteratee`. The
       * corresponding inverted value of each inverted key is an array of keys
       * responsible for generating the inverted value. The iteratee is invoked
       * with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.1.0
       * @category Object
       * @param {Object} object The object to invert.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {Object} Returns the new inverted object.
       * @example
       *
       * var object = { 'a': 1, 'b': 2, 'c': 1 };
       *
       * _.invertBy(object);
       * // => { '1': ['a', 'c'], '2': ['b'] }
       *
       * _.invertBy(object, function(value) {
       *   return 'group' + value;
       * });
       * // => { 'group1': ['a', 'c'], 'group2': ['b'] }
       */
      var invertBy = createInverter(function(result, value, key) {
        if (hasOwnProperty.call(result, value)) {
          result[value].push(key);
        } else {
          result[value] = [key];
        }
      }, getIteratee);
  
      /**
       * Invokes the method at `path` of `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The object to query.
       * @param {Array|string} path The path of the method to invoke.
       * @param {...*} [args] The arguments to invoke the method with.
       * @returns {*} Returns the result of the invoked method.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] };
       *
       * _.invoke(object, 'a[0].b.c.slice', 1, 3);
       * // => [2, 3]
       */
      var invoke = baseRest(baseInvoke);
  
      /**
       * Creates an array of the own enumerable property names of `object`.
       *
       * **Note:** Non-object values are coerced to objects. See the
       * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
       * for more details.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.keys(new Foo);
       * // => ['a', 'b'] (iteration order is not guaranteed)
       *
       * _.keys('hi');
       * // => ['0', '1']
       */
      function keys(object) {
        return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
      }
  
      /**
       * Creates an array of the own and inherited enumerable property names of `object`.
       *
       * **Note:** Non-object values are coerced to objects.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Object
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property names.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.keysIn(new Foo);
       * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
       */
      function keysIn(object) {
        return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);
      }
  
      /**
       * The opposite of `_.mapValues`; this method creates an object with the
       * same values as `object` and keys generated by running each own enumerable
       * string keyed property of `object` thru `iteratee`. The iteratee is invoked
       * with three arguments: (value, key, object).
       *
       * @static
       * @memberOf _
       * @since 3.8.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Object} Returns the new mapped object.
       * @see _.mapValues
       * @example
       *
       * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
       *   return key + value;
       * });
       * // => { 'a1': 1, 'b2': 2 }
       */
      function mapKeys(object, iteratee) {
        var result = {};
        iteratee = getIteratee(iteratee, 3);
  
        baseForOwn(object, function(value, key, object) {
          baseAssignValue(result, iteratee(value, key, object), value);
        });
        return result;
      }
  
      /**
       * Creates an object with the same keys as `object` and values generated
       * by running each own enumerable string keyed property of `object` thru
       * `iteratee`. The iteratee is invoked with three arguments:
       * (value, key, object).
       *
       * @static
       * @memberOf _
       * @since 2.4.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Object} Returns the new mapped object.
       * @see _.mapKeys
       * @example
       *
       * var users = {
       *   'fred':    { 'user': 'fred',    'age': 40 },
       *   'pebbles': { 'user': 'pebbles', 'age': 1 }
       * };
       *
       * _.mapValues(users, function(o) { return o.age; });
       * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
       *
       * // The `_.property` iteratee shorthand.
       * _.mapValues(users, 'age');
       * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
       */
      function mapValues(object, iteratee) {
        var result = {};
        iteratee = getIteratee(iteratee, 3);
  
        baseForOwn(object, function(value, key, object) {
          baseAssignValue(result, key, iteratee(value, key, object));
        });
        return result;
      }
  
      /**
       * This method is like `_.assign` except that it recursively merges own and
       * inherited enumerable string keyed properties of source objects into the
       * destination object. Source properties that resolve to `undefined` are
       * skipped if a destination value exists. Array and plain object properties
       * are merged recursively. Other objects and value types are overridden by
       * assignment. Source objects are applied from left to right. Subsequent
       * sources overwrite property assignments of previous sources.
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 0.5.0
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} [sources] The source objects.
       * @returns {Object} Returns `object`.
       * @example
       *
       * var object = {
       *   'a': [{ 'b': 2 }, { 'd': 4 }]
       * };
       *
       * var other = {
       *   'a': [{ 'c': 3 }, { 'e': 5 }]
       * };
       *
       * _.merge(object, other);
       * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }
       */
      var merge = createAssigner(function(object, source, srcIndex) {
        baseMerge(object, source, srcIndex);
      });
  
      /**
       * This method is like `_.merge` except that it accepts `customizer` which
       * is invoked to produce the merged values of the destination and source
       * properties. If `customizer` returns `undefined`, merging is handled by the
       * method instead. The `customizer` is invoked with six arguments:
       * (objValue, srcValue, key, object, source, stack).
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The destination object.
       * @param {...Object} sources The source objects.
       * @param {Function} customizer The function to customize assigned values.
       * @returns {Object} Returns `object`.
       * @example
       *
       * function customizer(objValue, srcValue) {
       *   if (_.isArray(objValue)) {
       *     return objValue.concat(srcValue);
       *   }
       * }
       *
       * var object = { 'a': [1], 'b': [2] };
       * var other = { 'a': [3], 'b': [4] };
       *
       * _.mergeWith(object, other, customizer);
       * // => { 'a': [1, 3], 'b': [2, 4] }
       */
      var mergeWith = createAssigner(function(object, source, srcIndex, customizer) {
        baseMerge(object, source, srcIndex, customizer);
      });
  
      /**
       * The opposite of `_.pick`; this method creates an object composed of the
       * own and inherited enumerable property paths of `object` that are not omitted.
       *
       * **Note:** This method is considerably slower than `_.pick`.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The source object.
       * @param {...(string|string[])} [paths] The property paths to omit.
       * @returns {Object} Returns the new object.
       * @example
       *
       * var object = { 'a': 1, 'b': '2', 'c': 3 };
       *
       * _.omit(object, ['a', 'c']);
       * // => { 'b': '2' }
       */
      var omit = flatRest(function(object, paths) {
        var result = {};
        if (object == null) {
          return result;
        }
        var isDeep = false;
        paths = arrayMap(paths, function(path) {
          path = castPath(path, object);
          isDeep || (isDeep = path.length > 1);
          return path;
        });
        copyObject(object, getAllKeysIn(object), result);
        if (isDeep) {
          result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone);
        }
        var length = paths.length;
        while (length--) {
          baseUnset(result, paths[length]);
        }
        return result;
      });
  
      /**
       * The opposite of `_.pickBy`; this method creates an object composed of
       * the own and inherited enumerable string keyed properties of `object` that
       * `predicate` doesn't return truthy for. The predicate is invoked with two
       * arguments: (value, key).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The source object.
       * @param {Function} [predicate=_.identity] The function invoked per property.
       * @returns {Object} Returns the new object.
       * @example
       *
       * var object = { 'a': 1, 'b': '2', 'c': 3 };
       *
       * _.omitBy(object, _.isNumber);
       * // => { 'b': '2' }
       */
      function omitBy(object, predicate) {
        return pickBy(object, negate(getIteratee(predicate)));
      }
  
      /**
       * Creates an object composed of the picked `object` properties.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The source object.
       * @param {...(string|string[])} [paths] The property paths to pick.
       * @returns {Object} Returns the new object.
       * @example
       *
       * var object = { 'a': 1, 'b': '2', 'c': 3 };
       *
       * _.pick(object, ['a', 'c']);
       * // => { 'a': 1, 'c': 3 }
       */
      var pick = flatRest(function(object, paths) {
        return object == null ? {} : basePick(object, paths);
      });
  
      /**
       * Creates an object composed of the `object` properties `predicate` returns
       * truthy for. The predicate is invoked with two arguments: (value, key).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The source object.
       * @param {Function} [predicate=_.identity] The function invoked per property.
       * @returns {Object} Returns the new object.
       * @example
       *
       * var object = { 'a': 1, 'b': '2', 'c': 3 };
       *
       * _.pickBy(object, _.isNumber);
       * // => { 'a': 1, 'c': 3 }
       */
      function pickBy(object, predicate) {
        if (object == null) {
          return {};
        }
        var props = arrayMap(getAllKeysIn(object), function(prop) {
          return [prop];
        });
        predicate = getIteratee(predicate);
        return basePickBy(object, props, function(value, path) {
          return predicate(value, path[0]);
        });
      }
  
      /**
       * This method is like `_.get` except that if the resolved value is a
       * function it's invoked with the `this` binding of its parent object and
       * its result is returned.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The object to query.
       * @param {Array|string} path The path of the property to resolve.
       * @param {*} [defaultValue] The value returned for `undefined` resolved values.
       * @returns {*} Returns the resolved value.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
       *
       * _.result(object, 'a[0].b.c1');
       * // => 3
       *
       * _.result(object, 'a[0].b.c2');
       * // => 4
       *
       * _.result(object, 'a[0].b.c3', 'default');
       * // => 'default'
       *
       * _.result(object, 'a[0].b.c3', _.constant('default'));
       * // => 'default'
       */
      function result(object, path, defaultValue) {
        path = castPath(path, object);
  
        var index = -1,
            length = path.length;
  
        // Ensure the loop is entered when path is empty.
        if (!length) {
          length = 1;
          object = undefined;
        }
        while (++index < length) {
          var value = object == null ? undefined : object[toKey(path[index])];
          if (value === undefined) {
            index = length;
            value = defaultValue;
          }
          object = isFunction(value) ? value.call(object) : value;
        }
        return object;
      }
  
      /**
       * Sets the value at `path` of `object`. If a portion of `path` doesn't exist,
       * it's created. Arrays are created for missing index properties while objects
       * are created for all other missing properties. Use `_.setWith` to customize
       * `path` creation.
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 3.7.0
       * @category Object
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to set.
       * @param {*} value The value to set.
       * @returns {Object} Returns `object`.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': 3 } }] };
       *
       * _.set(object, 'a[0].b.c', 4);
       * console.log(object.a[0].b.c);
       * // => 4
       *
       * _.set(object, ['x', '0', 'y', 'z'], 5);
       * console.log(object.x[0].y.z);
       * // => 5
       */
      function set(object, path, value) {
        return object == null ? object : baseSet(object, path, value);
      }
  
      /**
       * This method is like `_.set` except that it accepts `customizer` which is
       * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
       * path creation is handled by the method instead. The `customizer` is invoked
       * with three arguments: (nsValue, key, nsObject).
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to set.
       * @param {*} value The value to set.
       * @param {Function} [customizer] The function to customize assigned values.
       * @returns {Object} Returns `object`.
       * @example
       *
       * var object = {};
       *
       * _.setWith(object, '[0][1]', 'a', Object);
       * // => { '0': { '1': 'a' } }
       */
      function setWith(object, path, value, customizer) {
        customizer = typeof customizer == 'function' ? customizer : undefined;
        return object == null ? object : baseSet(object, path, value, customizer);
      }
  
      /**
       * Creates an array of own enumerable string keyed-value pairs for `object`
       * which can be consumed by `_.fromPairs`. If `object` is a map or set, its
       * entries are returned.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @alias entries
       * @category Object
       * @param {Object} object The object to query.
       * @returns {Array} Returns the key-value pairs.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.toPairs(new Foo);
       * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed)
       */
      var toPairs = createToPairs(keys);
  
      /**
       * Creates an array of own and inherited enumerable string keyed-value pairs
       * for `object` which can be consumed by `_.fromPairs`. If `object` is a map
       * or set, its entries are returned.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @alias entriesIn
       * @category Object
       * @param {Object} object The object to query.
       * @returns {Array} Returns the key-value pairs.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.toPairsIn(new Foo);
       * // => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed)
       */
      var toPairsIn = createToPairs(keysIn);
  
      /**
       * An alternative to `_.reduce`; this method transforms `object` to a new
       * `accumulator` object which is the result of running each of its own
       * enumerable string keyed properties thru `iteratee`, with each invocation
       * potentially mutating the `accumulator` object. If `accumulator` is not
       * provided, a new object with the same `[[Prototype]]` will be used. The
       * iteratee is invoked with four arguments: (accumulator, value, key, object).
       * Iteratee functions may exit iteration early by explicitly returning `false`.
       *
       * @static
       * @memberOf _
       * @since 1.3.0
       * @category Object
       * @param {Object} object The object to iterate over.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @param {*} [accumulator] The custom accumulator value.
       * @returns {*} Returns the accumulated value.
       * @example
       *
       * _.transform([2, 3, 4], function(result, n) {
       *   result.push(n *= n);
       *   return n % 2 == 0;
       * }, []);
       * // => [4, 9]
       *
       * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
       *   (result[value] || (result[value] = [])).push(key);
       * }, {});
       * // => { '1': ['a', 'c'], '2': ['b'] }
       */
      function transform(object, iteratee, accumulator) {
        var isArr = isArray(object),
            isArrLike = isArr || isBuffer(object) || isTypedArray(object);
  
        iteratee = getIteratee(iteratee, 4);
        if (accumulator == null) {
          var Ctor = object && object.constructor;
          if (isArrLike) {
            accumulator = isArr ? new Ctor : [];
          }
          else if (isObject(object)) {
            accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};
          }
          else {
            accumulator = {};
          }
        }
        (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) {
          return iteratee(accumulator, value, index, object);
        });
        return accumulator;
      }
  
      /**
       * Removes the property at `path` of `object`.
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Object
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to unset.
       * @returns {boolean} Returns `true` if the property is deleted, else `false`.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': 7 } }] };
       * _.unset(object, 'a[0].b.c');
       * // => true
       *
       * console.log(object);
       * // => { 'a': [{ 'b': {} }] };
       *
       * _.unset(object, ['a', '0', 'b', 'c']);
       * // => true
       *
       * console.log(object);
       * // => { 'a': [{ 'b': {} }] };
       */
      function unset(object, path) {
        return object == null ? true : baseUnset(object, path);
      }
  
      /**
       * This method is like `_.set` except that accepts `updater` to produce the
       * value to set. Use `_.updateWith` to customize `path` creation. The `updater`
       * is invoked with one argument: (value).
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.6.0
       * @category Object
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to set.
       * @param {Function} updater The function to produce the updated value.
       * @returns {Object} Returns `object`.
       * @example
       *
       * var object = { 'a': [{ 'b': { 'c': 3 } }] };
       *
       * _.update(object, 'a[0].b.c', function(n) { return n * n; });
       * console.log(object.a[0].b.c);
       * // => 9
       *
       * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });
       * console.log(object.x[0].y.z);
       * // => 0
       */
      function update(object, path, updater) {
        return object == null ? object : baseUpdate(object, path, castFunction(updater));
      }
  
      /**
       * This method is like `_.update` except that it accepts `customizer` which is
       * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
       * path creation is handled by the method instead. The `customizer` is invoked
       * with three arguments: (nsValue, key, nsObject).
       *
       * **Note:** This method mutates `object`.
       *
       * @static
       * @memberOf _
       * @since 4.6.0
       * @category Object
       * @param {Object} object The object to modify.
       * @param {Array|string} path The path of the property to set.
       * @param {Function} updater The function to produce the updated value.
       * @param {Function} [customizer] The function to customize assigned values.
       * @returns {Object} Returns `object`.
       * @example
       *
       * var object = {};
       *
       * _.updateWith(object, '[0][1]', _.constant('a'), Object);
       * // => { '0': { '1': 'a' } }
       */
      function updateWith(object, path, updater, customizer) {
        customizer = typeof customizer == 'function' ? customizer : undefined;
        return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer);
      }
  
      /**
       * Creates an array of the own enumerable string keyed property values of `object`.
       *
       * **Note:** Non-object values are coerced to objects.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Object
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property values.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.values(new Foo);
       * // => [1, 2] (iteration order is not guaranteed)
       *
       * _.values('hi');
       * // => ['h', 'i']
       */
      function values(object) {
        return object == null ? [] : baseValues(object, keys(object));
      }
  
      /**
       * Creates an array of the own and inherited enumerable string keyed property
       * values of `object`.
       *
       * **Note:** Non-object values are coerced to objects.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Object
       * @param {Object} object The object to query.
       * @returns {Array} Returns the array of property values.
       * @example
       *
       * function Foo() {
       *   this.a = 1;
       *   this.b = 2;
       * }
       *
       * Foo.prototype.c = 3;
       *
       * _.valuesIn(new Foo);
       * // => [1, 2, 3] (iteration order is not guaranteed)
       */
      function valuesIn(object) {
        return object == null ? [] : baseValues(object, keysIn(object));
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Clamps `number` within the inclusive `lower` and `upper` bounds.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Number
       * @param {number} number The number to clamp.
       * @param {number} [lower] The lower bound.
       * @param {number} upper The upper bound.
       * @returns {number} Returns the clamped number.
       * @example
       *
       * _.clamp(-10, -5, 5);
       * // => -5
       *
       * _.clamp(10, -5, 5);
       * // => 5
       */
      function clamp(number, lower, upper) {
        if (upper === undefined) {
          upper = lower;
          lower = undefined;
        }
        if (upper !== undefined) {
          upper = toNumber(upper);
          upper = upper === upper ? upper : 0;
        }
        if (lower !== undefined) {
          lower = toNumber(lower);
          lower = lower === lower ? lower : 0;
        }
        return baseClamp(toNumber(number), lower, upper);
      }
  
      /**
       * Checks if `n` is between `start` and up to, but not including, `end`. If
       * `end` is not specified, it's set to `start` with `start` then set to `0`.
       * If `start` is greater than `end` the params are swapped to support
       * negative ranges.
       *
       * @static
       * @memberOf _
       * @since 3.3.0
       * @category Number
       * @param {number} number The number to check.
       * @param {number} [start=0] The start of the range.
       * @param {number} end The end of the range.
       * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
       * @see _.range, _.rangeRight
       * @example
       *
       * _.inRange(3, 2, 4);
       * // => true
       *
       * _.inRange(4, 8);
       * // => true
       *
       * _.inRange(4, 2);
       * // => false
       *
       * _.inRange(2, 2);
       * // => false
       *
       * _.inRange(1.2, 2);
       * // => true
       *
       * _.inRange(5.2, 4);
       * // => false
       *
       * _.inRange(-3, -2, -6);
       * // => true
       */
      function inRange(number, start, end) {
        start = toFinite(start);
        if (end === undefined) {
          end = start;
          start = 0;
        } else {
          end = toFinite(end);
        }
        number = toNumber(number);
        return baseInRange(number, start, end);
      }
  
      /**
       * Produces a random number between the inclusive `lower` and `upper` bounds.
       * If only one argument is provided a number between `0` and the given number
       * is returned. If `floating` is `true`, or either `lower` or `upper` are
       * floats, a floating-point number is returned instead of an integer.
       *
       * **Note:** JavaScript follows the IEEE-754 standard for resolving
       * floating-point values which can produce unexpected results.
       *
       * @static
       * @memberOf _
       * @since 0.7.0
       * @category Number
       * @param {number} [lower=0] The lower bound.
       * @param {number} [upper=1] The upper bound.
       * @param {boolean} [floating] Specify returning a floating-point number.
       * @returns {number} Returns the random number.
       * @example
       *
       * _.random(0, 5);
       * // => an integer between 0 and 5
       *
       * _.random(5);
       * // => also an integer between 0 and 5
       *
       * _.random(5, true);
       * // => a floating-point number between 0 and 5
       *
       * _.random(1.2, 5.2);
       * // => a floating-point number between 1.2 and 5.2
       */
      function random(lower, upper, floating) {
        if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {
          upper = floating = undefined;
        }
        if (floating === undefined) {
          if (typeof upper == 'boolean') {
            floating = upper;
            upper = undefined;
          }
          else if (typeof lower == 'boolean') {
            floating = lower;
            lower = undefined;
          }
        }
        if (lower === undefined && upper === undefined) {
          lower = 0;
          upper = 1;
        }
        else {
          lower = toFinite(lower);
          if (upper === undefined) {
            upper = lower;
            lower = 0;
          } else {
            upper = toFinite(upper);
          }
        }
        if (lower > upper) {
          var temp = lower;
          lower = upper;
          upper = temp;
        }
        if (floating || lower % 1 || upper % 1) {
          var rand = nativeRandom();
          return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper);
        }
        return baseRandom(lower, upper);
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the camel cased string.
       * @example
       *
       * _.camelCase('Foo Bar');
       * // => 'fooBar'
       *
       * _.camelCase('--foo-bar--');
       * // => 'fooBar'
       *
       * _.camelCase('__FOO_BAR__');
       * // => 'fooBar'
       */
      var camelCase = createCompounder(function(result, word, index) {
        word = word.toLowerCase();
        return result + (index ? capitalize(word) : word);
      });
  
      /**
       * Converts the first character of `string` to upper case and the remaining
       * to lower case.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to capitalize.
       * @returns {string} Returns the capitalized string.
       * @example
       *
       * _.capitalize('FRED');
       * // => 'Fred'
       */
      function capitalize(string) {
        return upperFirst(toString(string).toLowerCase());
      }
  
      /**
       * Deburrs `string` by converting
       * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
       * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A)
       * letters to basic Latin letters and removing
       * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to deburr.
       * @returns {string} Returns the deburred string.
       * @example
       *
       * _.deburr('déjà vu');
       * // => 'deja vu'
       */
      function deburr(string) {
        string = toString(string);
        return string && string.replace(reLatin, deburrLetter).replace(reComboMark, '');
      }
  
      /**
       * Checks if `string` ends with the given target string.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to inspect.
       * @param {string} [target] The string to search for.
       * @param {number} [position=string.length] The position to search up to.
       * @returns {boolean} Returns `true` if `string` ends with `target`,
       *  else `false`.
       * @example
       *
       * _.endsWith('abc', 'c');
       * // => true
       *
       * _.endsWith('abc', 'b');
       * // => false
       *
       * _.endsWith('abc', 'b', 2);
       * // => true
       */
      function endsWith(string, target, position) {
        string = toString(string);
        target = baseToString(target);
  
        var length = string.length;
        position = position === undefined
          ? length
          : baseClamp(toInteger(position), 0, length);
  
        var end = position;
        position -= target.length;
        return position >= 0 && string.slice(position, end) == target;
      }
  
      /**
       * Converts the characters "&", "<", ">", '"', and "'" in `string` to their
       * corresponding HTML entities.
       *
       * **Note:** No other characters are escaped. To escape additional
       * characters use a third-party library like [_he_](https://mths.be/he).
       *
       * Though the ">" character is escaped for symmetry, characters like
       * ">" and "/" don't need escaping in HTML and have no special meaning
       * unless they're part of a tag or unquoted attribute value. See
       * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
       * (under "semi-related fun fact") for more details.
       *
       * When working with HTML you should always
       * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
       * XSS vectors.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category String
       * @param {string} [string=''] The string to escape.
       * @returns {string} Returns the escaped string.
       * @example
       *
       * _.escape('fred, barney, & pebbles');
       * // => 'fred, barney, &amp; pebbles'
       */
      function escape(string) {
        string = toString(string);
        return (string && reHasUnescapedHtml.test(string))
          ? string.replace(reUnescapedHtml, escapeHtmlChar)
          : string;
      }
  
      /**
       * Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+",
       * "?", "(", ")", "[", "]", "{", "}", and "|" in `string`.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to escape.
       * @returns {string} Returns the escaped string.
       * @example
       *
       * _.escapeRegExp('[lodash](https://lodash.com/)');
       * // => '\[lodash\]\(https://lodash\.com/\)'
       */
      function escapeRegExp(string) {
        string = toString(string);
        return (string && reHasRegExpChar.test(string))
          ? string.replace(reRegExpChar, '\\$&')
          : string;
      }
  
      /**
       * Converts `string` to
       * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the kebab cased string.
       * @example
       *
       * _.kebabCase('Foo Bar');
       * // => 'foo-bar'
       *
       * _.kebabCase('fooBar');
       * // => 'foo-bar'
       *
       * _.kebabCase('__FOO_BAR__');
       * // => 'foo-bar'
       */
      var kebabCase = createCompounder(function(result, word, index) {
        return result + (index ? '-' : '') + word.toLowerCase();
      });
  
      /**
       * Converts `string`, as space separated words, to lower case.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the lower cased string.
       * @example
       *
       * _.lowerCase('--Foo-Bar--');
       * // => 'foo bar'
       *
       * _.lowerCase('fooBar');
       * // => 'foo bar'
       *
       * _.lowerCase('__FOO_BAR__');
       * // => 'foo bar'
       */
      var lowerCase = createCompounder(function(result, word, index) {
        return result + (index ? ' ' : '') + word.toLowerCase();
      });
  
      /**
       * Converts the first character of `string` to lower case.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the converted string.
       * @example
       *
       * _.lowerFirst('Fred');
       * // => 'fred'
       *
       * _.lowerFirst('FRED');
       * // => 'fRED'
       */
      var lowerFirst = createCaseFirst('toLowerCase');
  
      /**
       * Pads `string` on the left and right sides if it's shorter than `length`.
       * Padding characters are truncated if they can't be evenly divided by `length`.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to pad.
       * @param {number} [length=0] The padding length.
       * @param {string} [chars=' '] The string used as padding.
       * @returns {string} Returns the padded string.
       * @example
       *
       * _.pad('abc', 8);
       * // => '  abc   '
       *
       * _.pad('abc', 8, '_-');
       * // => '_-abc_-_'
       *
       * _.pad('abc', 3);
       * // => 'abc'
       */
      function pad(string, length, chars) {
        string = toString(string);
        length = toInteger(length);
  
        var strLength = length ? stringSize(string) : 0;
        if (!length || strLength >= length) {
          return string;
        }
        var mid = (length - strLength) / 2;
        return (
          createPadding(nativeFloor(mid), chars) +
          string +
          createPadding(nativeCeil(mid), chars)
        );
      }
  
      /**
       * Pads `string` on the right side if it's shorter than `length`. Padding
       * characters are truncated if they exceed `length`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to pad.
       * @param {number} [length=0] The padding length.
       * @param {string} [chars=' '] The string used as padding.
       * @returns {string} Returns the padded string.
       * @example
       *
       * _.padEnd('abc', 6);
       * // => 'abc   '
       *
       * _.padEnd('abc', 6, '_-');
       * // => 'abc_-_'
       *
       * _.padEnd('abc', 3);
       * // => 'abc'
       */
      function padEnd(string, length, chars) {
        string = toString(string);
        length = toInteger(length);
  
        var strLength = length ? stringSize(string) : 0;
        return (length && strLength < length)
          ? (string + createPadding(length - strLength, chars))
          : string;
      }
  
      /**
       * Pads `string` on the left side if it's shorter than `length`. Padding
       * characters are truncated if they exceed `length`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to pad.
       * @param {number} [length=0] The padding length.
       * @param {string} [chars=' '] The string used as padding.
       * @returns {string} Returns the padded string.
       * @example
       *
       * _.padStart('abc', 6);
       * // => '   abc'
       *
       * _.padStart('abc', 6, '_-');
       * // => '_-_abc'
       *
       * _.padStart('abc', 3);
       * // => 'abc'
       */
      function padStart(string, length, chars) {
        string = toString(string);
        length = toInteger(length);
  
        var strLength = length ? stringSize(string) : 0;
        return (length && strLength < length)
          ? (createPadding(length - strLength, chars) + string)
          : string;
      }
  
      /**
       * Converts `string` to an integer of the specified radix. If `radix` is
       * `undefined` or `0`, a `radix` of `10` is used unless `value` is a
       * hexadecimal, in which case a `radix` of `16` is used.
       *
       * **Note:** This method aligns with the
       * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`.
       *
       * @static
       * @memberOf _
       * @since 1.1.0
       * @category String
       * @param {string} string The string to convert.
       * @param {number} [radix=10] The radix to interpret `value` by.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {number} Returns the converted integer.
       * @example
       *
       * _.parseInt('08');
       * // => 8
       *
       * _.map(['6', '08', '10'], _.parseInt);
       * // => [6, 8, 10]
       */
      function parseInt(string, radix, guard) {
        if (guard || radix == null) {
          radix = 0;
        } else if (radix) {
          radix = +radix;
        }
        return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0);
      }
  
      /**
       * Repeats the given string `n` times.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to repeat.
       * @param {number} [n=1] The number of times to repeat the string.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {string} Returns the repeated string.
       * @example
       *
       * _.repeat('*', 3);
       * // => '***'
       *
       * _.repeat('abc', 2);
       * // => 'abcabc'
       *
       * _.repeat('abc', 0);
       * // => ''
       */
      function repeat(string, n, guard) {
        if ((guard ? isIterateeCall(string, n, guard) : n === undefined)) {
          n = 1;
        } else {
          n = toInteger(n);
        }
        return baseRepeat(toString(string), n);
      }
  
      /**
       * Replaces matches for `pattern` in `string` with `replacement`.
       *
       * **Note:** This method is based on
       * [`String#replace`](https://mdn.io/String/replace).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to modify.
       * @param {RegExp|string} pattern The pattern to replace.
       * @param {Function|string} replacement The match replacement.
       * @returns {string} Returns the modified string.
       * @example
       *
       * _.replace('Hi Fred', 'Fred', 'Barney');
       * // => 'Hi Barney'
       */
      function replace() {
        var args = arguments,
            string = toString(args[0]);
  
        return args.length < 3 ? string : string.replace(args[1], args[2]);
      }
  
      /**
       * Converts `string` to
       * [snake case](https://en.wikipedia.org/wiki/Snake_case).
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the snake cased string.
       * @example
       *
       * _.snakeCase('Foo Bar');
       * // => 'foo_bar'
       *
       * _.snakeCase('fooBar');
       * // => 'foo_bar'
       *
       * _.snakeCase('--FOO-BAR--');
       * // => 'foo_bar'
       */
      var snakeCase = createCompounder(function(result, word, index) {
        return result + (index ? '_' : '') + word.toLowerCase();
      });
  
      /**
       * Splits `string` by `separator`.
       *
       * **Note:** This method is based on
       * [`String#split`](https://mdn.io/String/split).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to split.
       * @param {RegExp|string} separator The separator pattern to split by.
       * @param {number} [limit] The length to truncate results to.
       * @returns {Array} Returns the string segments.
       * @example
       *
       * _.split('a-b-c', '-', 2);
       * // => ['a', 'b']
       */
      function split(string, separator, limit) {
        if (limit && typeof limit != 'number' && isIterateeCall(string, separator, limit)) {
          separator = limit = undefined;
        }
        limit = limit === undefined ? MAX_ARRAY_LENGTH : limit >>> 0;
        if (!limit) {
          return [];
        }
        string = toString(string);
        if (string && (
              typeof separator == 'string' ||
              (separator != null && !isRegExp(separator))
            )) {
          separator = baseToString(separator);
          if (!separator && hasUnicode(string)) {
            return castSlice(stringToArray(string), 0, limit);
          }
        }
        return string.split(separator, limit);
      }
  
      /**
       * Converts `string` to
       * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).
       *
       * @static
       * @memberOf _
       * @since 3.1.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the start cased string.
       * @example
       *
       * _.startCase('--foo-bar--');
       * // => 'Foo Bar'
       *
       * _.startCase('fooBar');
       * // => 'Foo Bar'
       *
       * _.startCase('__FOO_BAR__');
       * // => 'FOO BAR'
       */
      var startCase = createCompounder(function(result, word, index) {
        return result + (index ? ' ' : '') + upperFirst(word);
      });
  
      /**
       * Checks if `string` starts with the given target string.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to inspect.
       * @param {string} [target] The string to search for.
       * @param {number} [position=0] The position to search from.
       * @returns {boolean} Returns `true` if `string` starts with `target`,
       *  else `false`.
       * @example
       *
       * _.startsWith('abc', 'a');
       * // => true
       *
       * _.startsWith('abc', 'b');
       * // => false
       *
       * _.startsWith('abc', 'b', 1);
       * // => true
       */
      function startsWith(string, target, position) {
        string = toString(string);
        position = position == null
          ? 0
          : baseClamp(toInteger(position), 0, string.length);
  
        target = baseToString(target);
        return string.slice(position, position + target.length) == target;
      }
  
      /**
       * Creates a compiled template function that can interpolate data properties
       * in "interpolate" delimiters, HTML-escape interpolated data properties in
       * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
       * properties may be accessed as free variables in the template. If a setting
       * object is given, it takes precedence over `_.templateSettings` values.
       *
       * **Note:** In the development build `_.template` utilizes
       * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
       * for easier debugging.
       *
       * For more information on precompiling templates see
       * [lodash's custom builds documentation](https://lodash.com/custom-builds).
       *
       * For more information on Chrome extension sandboxes see
       * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category String
       * @param {string} [string=''] The template string.
       * @param {Object} [options={}] The options object.
       * @param {RegExp} [options.escape=_.templateSettings.escape]
       *  The HTML "escape" delimiter.
       * @param {RegExp} [options.evaluate=_.templateSettings.evaluate]
       *  The "evaluate" delimiter.
       * @param {Object} [options.imports=_.templateSettings.imports]
       *  An object to import into the template as free variables.
       * @param {RegExp} [options.interpolate=_.templateSettings.interpolate]
       *  The "interpolate" delimiter.
       * @param {string} [options.sourceURL='lodash.templateSources[n]']
       *  The sourceURL of the compiled template.
       * @param {string} [options.variable='obj']
       *  The data object variable name.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Function} Returns the compiled template function.
       * @example
       *
       * // Use the "interpolate" delimiter to create a compiled template.
       * var compiled = _.template('hello <%= user %>!');
       * compiled({ 'user': 'fred' });
       * // => 'hello fred!'
       *
       * // Use the HTML "escape" delimiter to escape data property values.
       * var compiled = _.template('<b><%- value %></b>');
       * compiled({ 'value': '<script>' });
       * // => '<b>&lt;script&gt;</b>'
       *
       * // Use the "evaluate" delimiter to execute JavaScript and generate HTML.
       * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
       * compiled({ 'users': ['fred', 'barney'] });
       * // => '<li>fred</li><li>barney</li>'
       *
       * // Use the internal `print` function in "evaluate" delimiters.
       * var compiled = _.template('<% print("hello " + user); %>!');
       * compiled({ 'user': 'barney' });
       * // => 'hello barney!'
       *
       * // Use the ES template literal delimiter as an "interpolate" delimiter.
       * // Disable support by replacing the "interpolate" delimiter.
       * var compiled = _.template('hello ${ user }!');
       * compiled({ 'user': 'pebbles' });
       * // => 'hello pebbles!'
       *
       * // Use backslashes to treat delimiters as plain text.
       * var compiled = _.template('<%= "\\<%- value %\\>" %>');
       * compiled({ 'value': 'ignored' });
       * // => '<%- value %>'
       *
       * // Use the `imports` option to import `jQuery` as `jq`.
       * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
       * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
       * compiled({ 'users': ['fred', 'barney'] });
       * // => '<li>fred</li><li>barney</li>'
       *
       * // Use the `sourceURL` option to specify a custom sourceURL for the template.
       * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
       * compiled(data);
       * // => Find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector.
       *
       * // Use the `variable` option to ensure a with-statement isn't used in the compiled template.
       * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
       * compiled.source;
       * // => function(data) {
       * //   var __t, __p = '';
       * //   __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!';
       * //   return __p;
       * // }
       *
       * // Use custom template delimiters.
       * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
       * var compiled = _.template('hello {{ user }}!');
       * compiled({ 'user': 'mustache' });
       * // => 'hello mustache!'
       *
       * // Use the `source` property to inline compiled templates for meaningful
       * // line numbers in error messages and stack traces.
       * fs.writeFileSync(path.join(process.cwd(), 'jst.js'), '\
       *   var JST = {\
       *     "main": ' + _.template(mainText).source + '\
       *   };\
       * ');
       */
      function template(string, options, guard) {
        // Based on John Resig's `tmpl` implementation
        // (http://ejohn.org/blog/javascript-micro-templating/)
        // and Laura Doktorova's doT.js (https://github.com/olado/doT).
        var settings = lodash.templateSettings;
  
        if (guard && isIterateeCall(string, options, guard)) {
          options = undefined;
        }
        string = toString(string);
        options = assignInWith({}, options, settings, customDefaultsAssignIn);
  
        var imports = assignInWith({}, options.imports, settings.imports, customDefaultsAssignIn),
            importsKeys = keys(imports),
            importsValues = baseValues(imports, importsKeys);
  
        var isEscaping,
            isEvaluating,
            index = 0,
            interpolate = options.interpolate || reNoMatch,
            source = "__p += '";
  
        // Compile the regexp to match each delimiter.
        var reDelimiters = RegExp(
          (options.escape || reNoMatch).source + '|' +
          interpolate.source + '|' +
          (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
          (options.evaluate || reNoMatch).source + '|$'
        , 'g');
  
        // Use a sourceURL for easier debugging.
        var sourceURL = '//# sourceURL=' +
          ('sourceURL' in options
            ? options.sourceURL
            : ('lodash.templateSources[' + (++templateCounter) + ']')
          ) + '\n';
  
        string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
          interpolateValue || (interpolateValue = esTemplateValue);
  
          // Escape characters that can't be included in string literals.
          source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar);
  
          // Replace delimiters with snippets.
          if (escapeValue) {
            isEscaping = true;
            source += "' +\n__e(" + escapeValue + ") +\n'";
          }
          if (evaluateValue) {
            isEvaluating = true;
            source += "';\n" + evaluateValue + ";\n__p += '";
          }
          if (interpolateValue) {
            source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
          }
          index = offset + match.length;
  
          // The JS engine embedded in Adobe products needs `match` returned in
          // order to produce the correct `offset` value.
          return match;
        });
  
        source += "';\n";
  
        // If `variable` is not specified wrap a with-statement around the generated
        // code to add the data object to the top of the scope chain.
        var variable = options.variable;
        if (!variable) {
          source = 'with (obj) {\n' + source + '\n}\n';
        }
        // Cleanup code by stripping empty strings.
        source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
          .replace(reEmptyStringMiddle, '$1')
          .replace(reEmptyStringTrailing, '$1;');
  
        // Frame code as the function body.
        source = 'function(' + (variable || 'obj') + ') {\n' +
          (variable
            ? ''
            : 'obj || (obj = {});\n'
          ) +
          "var __t, __p = ''" +
          (isEscaping
             ? ', __e = _.escape'
             : ''
          ) +
          (isEvaluating
            ? ', __j = Array.prototype.join;\n' +
              "function print() { __p += __j.call(arguments, '') }\n"
            : ';\n'
          ) +
          source +
          'return __p\n}';
  
        var result = attempt(function() {
          return Function(importsKeys, sourceURL + 'return ' + source)
            .apply(undefined, importsValues);
        });
  
        // Provide the compiled function's source by its `toString` method or
        // the `source` property as a convenience for inlining compiled templates.
        result.source = source;
        if (isError(result)) {
          throw result;
        }
        return result;
      }
  
      /**
       * Converts `string`, as a whole, to lower case just like
       * [String#toLowerCase](https://mdn.io/toLowerCase).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the lower cased string.
       * @example
       *
       * _.toLower('--Foo-Bar--');
       * // => '--foo-bar--'
       *
       * _.toLower('fooBar');
       * // => 'foobar'
       *
       * _.toLower('__FOO_BAR__');
       * // => '__foo_bar__'
       */
      function toLower(value) {
        return toString(value).toLowerCase();
      }
  
      /**
       * Converts `string`, as a whole, to upper case just like
       * [String#toUpperCase](https://mdn.io/toUpperCase).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the upper cased string.
       * @example
       *
       * _.toUpper('--foo-bar--');
       * // => '--FOO-BAR--'
       *
       * _.toUpper('fooBar');
       * // => 'FOOBAR'
       *
       * _.toUpper('__foo_bar__');
       * // => '__FOO_BAR__'
       */
      function toUpper(value) {
        return toString(value).toUpperCase();
      }
  
      /**
       * Removes leading and trailing whitespace or specified characters from `string`.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to trim.
       * @param {string} [chars=whitespace] The characters to trim.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {string} Returns the trimmed string.
       * @example
       *
       * _.trim('  abc  ');
       * // => 'abc'
       *
       * _.trim('-_-abc-_-', '_-');
       * // => 'abc'
       *
       * _.map(['  foo  ', '  bar  '], _.trim);
       * // => ['foo', 'bar']
       */
      function trim(string, chars, guard) {
        string = toString(string);
        if (string && (guard || chars === undefined)) {
          return string.replace(reTrim, '');
        }
        if (!string || !(chars = baseToString(chars))) {
          return string;
        }
        var strSymbols = stringToArray(string),
            chrSymbols = stringToArray(chars),
            start = charsStartIndex(strSymbols, chrSymbols),
            end = charsEndIndex(strSymbols, chrSymbols) + 1;
  
        return castSlice(strSymbols, start, end).join('');
      }
  
      /**
       * Removes trailing whitespace or specified characters from `string`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to trim.
       * @param {string} [chars=whitespace] The characters to trim.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {string} Returns the trimmed string.
       * @example
       *
       * _.trimEnd('  abc  ');
       * // => '  abc'
       *
       * _.trimEnd('-_-abc-_-', '_-');
       * // => '-_-abc'
       */
      function trimEnd(string, chars, guard) {
        string = toString(string);
        if (string && (guard || chars === undefined)) {
          return string.replace(reTrimEnd, '');
        }
        if (!string || !(chars = baseToString(chars))) {
          return string;
        }
        var strSymbols = stringToArray(string),
            end = charsEndIndex(strSymbols, stringToArray(chars)) + 1;
  
        return castSlice(strSymbols, 0, end).join('');
      }
  
      /**
       * Removes leading whitespace or specified characters from `string`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to trim.
       * @param {string} [chars=whitespace] The characters to trim.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {string} Returns the trimmed string.
       * @example
       *
       * _.trimStart('  abc  ');
       * // => 'abc  '
       *
       * _.trimStart('-_-abc-_-', '_-');
       * // => 'abc-_-'
       */
      function trimStart(string, chars, guard) {
        string = toString(string);
        if (string && (guard || chars === undefined)) {
          return string.replace(reTrimStart, '');
        }
        if (!string || !(chars = baseToString(chars))) {
          return string;
        }
        var strSymbols = stringToArray(string),
            start = charsStartIndex(strSymbols, stringToArray(chars));
  
        return castSlice(strSymbols, start).join('');
      }
  
      /**
       * Truncates `string` if it's longer than the given maximum string length.
       * The last characters of the truncated string are replaced with the omission
       * string which defaults to "...".
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to truncate.
       * @param {Object} [options={}] The options object.
       * @param {number} [options.length=30] The maximum string length.
       * @param {string} [options.omission='...'] The string to indicate text is omitted.
       * @param {RegExp|string} [options.separator] The separator pattern to truncate to.
       * @returns {string} Returns the truncated string.
       * @example
       *
       * _.truncate('hi-diddly-ho there, neighborino');
       * // => 'hi-diddly-ho there, neighbo...'
       *
       * _.truncate('hi-diddly-ho there, neighborino', {
       *   'length': 24,
       *   'separator': ' '
       * });
       * // => 'hi-diddly-ho there,...'
       *
       * _.truncate('hi-diddly-ho there, neighborino', {
       *   'length': 24,
       *   'separator': /,? +/
       * });
       * // => 'hi-diddly-ho there...'
       *
       * _.truncate('hi-diddly-ho there, neighborino', {
       *   'omission': ' [...]'
       * });
       * // => 'hi-diddly-ho there, neig [...]'
       */
      function truncate(string, options) {
        var length = DEFAULT_TRUNC_LENGTH,
            omission = DEFAULT_TRUNC_OMISSION;
  
        if (isObject(options)) {
          var separator = 'separator' in options ? options.separator : separator;
          length = 'length' in options ? toInteger(options.length) : length;
          omission = 'omission' in options ? baseToString(options.omission) : omission;
        }
        string = toString(string);
  
        var strLength = string.length;
        if (hasUnicode(string)) {
          var strSymbols = stringToArray(string);
          strLength = strSymbols.length;
        }
        if (length >= strLength) {
          return string;
        }
        var end = length - stringSize(omission);
        if (end < 1) {
          return omission;
        }
        var result = strSymbols
          ? castSlice(strSymbols, 0, end).join('')
          : string.slice(0, end);
  
        if (separator === undefined) {
          return result + omission;
        }
        if (strSymbols) {
          end += (result.length - end);
        }
        if (isRegExp(separator)) {
          if (string.slice(end).search(separator)) {
            var match,
                substring = result;
  
            if (!separator.global) {
              separator = RegExp(separator.source, toString(reFlags.exec(separator)) + 'g');
            }
            separator.lastIndex = 0;
            while ((match = separator.exec(substring))) {
              var newEnd = match.index;
            }
            result = result.slice(0, newEnd === undefined ? end : newEnd);
          }
        } else if (string.indexOf(baseToString(separator), end) != end) {
          var index = result.lastIndexOf(separator);
          if (index > -1) {
            result = result.slice(0, index);
          }
        }
        return result + omission;
      }
  
      /**
       * The inverse of `_.escape`; this method converts the HTML entities
       * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to
       * their corresponding characters.
       *
       * **Note:** No other HTML entities are unescaped. To unescape additional
       * HTML entities use a third-party library like [_he_](https://mths.be/he).
       *
       * @static
       * @memberOf _
       * @since 0.6.0
       * @category String
       * @param {string} [string=''] The string to unescape.
       * @returns {string} Returns the unescaped string.
       * @example
       *
       * _.unescape('fred, barney, &amp; pebbles');
       * // => 'fred, barney, & pebbles'
       */
      function unescape(string) {
        string = toString(string);
        return (string && reHasEscapedHtml.test(string))
          ? string.replace(reEscapedHtml, unescapeHtmlChar)
          : string;
      }
  
      /**
       * Converts `string`, as space separated words, to upper case.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the upper cased string.
       * @example
       *
       * _.upperCase('--foo-bar');
       * // => 'FOO BAR'
       *
       * _.upperCase('fooBar');
       * // => 'FOO BAR'
       *
       * _.upperCase('__foo_bar__');
       * // => 'FOO BAR'
       */
      var upperCase = createCompounder(function(result, word, index) {
        return result + (index ? ' ' : '') + word.toUpperCase();
      });
  
      /**
       * Converts the first character of `string` to upper case.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category String
       * @param {string} [string=''] The string to convert.
       * @returns {string} Returns the converted string.
       * @example
       *
       * _.upperFirst('fred');
       * // => 'Fred'
       *
       * _.upperFirst('FRED');
       * // => 'FRED'
       */
      var upperFirst = createCaseFirst('toUpperCase');
  
      /**
       * Splits `string` into an array of its words.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category String
       * @param {string} [string=''] The string to inspect.
       * @param {RegExp|string} [pattern] The pattern to match words.
       * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
       * @returns {Array} Returns the words of `string`.
       * @example
       *
       * _.words('fred, barney, & pebbles');
       * // => ['fred', 'barney', 'pebbles']
       *
       * _.words('fred, barney, & pebbles', /[^, ]+/g);
       * // => ['fred', 'barney', '&', 'pebbles']
       */
      function words(string, pattern, guard) {
        string = toString(string);
        pattern = guard ? undefined : pattern;
  
        if (pattern === undefined) {
          return hasUnicodeWord(string) ? unicodeWords(string) : asciiWords(string);
        }
        return string.match(pattern) || [];
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Attempts to invoke `func`, returning either the result or the caught error
       * object. Any additional arguments are provided to `func` when it's invoked.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Util
       * @param {Function} func The function to attempt.
       * @param {...*} [args] The arguments to invoke `func` with.
       * @returns {*} Returns the `func` result or error object.
       * @example
       *
       * // Avoid throwing errors for invalid selectors.
       * var elements = _.attempt(function(selector) {
       *   return document.querySelectorAll(selector);
       * }, '>_>');
       *
       * if (_.isError(elements)) {
       *   elements = [];
       * }
       */
      var attempt = baseRest(function(func, args) {
        try {
          return apply(func, undefined, args);
        } catch (e) {
          return isError(e) ? e : new Error(e);
        }
      });
  
      /**
       * Binds methods of an object to the object itself, overwriting the existing
       * method.
       *
       * **Note:** This method doesn't set the "length" property of bound functions.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @param {Object} object The object to bind and assign the bound methods to.
       * @param {...(string|string[])} methodNames The object method names to bind.
       * @returns {Object} Returns `object`.
       * @example
       *
       * var view = {
       *   'label': 'docs',
       *   'click': function() {
       *     console.log('clicked ' + this.label);
       *   }
       * };
       *
       * _.bindAll(view, ['click']);
       * jQuery(element).on('click', view.click);
       * // => Logs 'clicked docs' when clicked.
       */
      var bindAll = flatRest(function(object, methodNames) {
        arrayEach(methodNames, function(key) {
          key = toKey(key);
          baseAssignValue(object, key, bind(object[key], object));
        });
        return object;
      });
  
      /**
       * Creates a function that iterates over `pairs` and invokes the corresponding
       * function of the first predicate to return truthy. The predicate-function
       * pairs are invoked with the `this` binding and arguments of the created
       * function.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {Array} pairs The predicate-function pairs.
       * @returns {Function} Returns the new composite function.
       * @example
       *
       * var func = _.cond([
       *   [_.matches({ 'a': 1 }),           _.constant('matches A')],
       *   [_.conforms({ 'b': _.isNumber }), _.constant('matches B')],
       *   [_.stubTrue,                      _.constant('no match')]
       * ]);
       *
       * func({ 'a': 1, 'b': 2 });
       * // => 'matches A'
       *
       * func({ 'a': 0, 'b': 1 });
       * // => 'matches B'
       *
       * func({ 'a': '1', 'b': '2' });
       * // => 'no match'
       */
      function cond(pairs) {
        var length = pairs == null ? 0 : pairs.length,
            toIteratee = getIteratee();
  
        pairs = !length ? [] : arrayMap(pairs, function(pair) {
          if (typeof pair[1] != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          return [toIteratee(pair[0]), pair[1]];
        });
  
        return baseRest(function(args) {
          var index = -1;
          while (++index < length) {
            var pair = pairs[index];
            if (apply(pair[0], this, args)) {
              return apply(pair[1], this, args);
            }
          }
        });
      }
  
      /**
       * Creates a function that invokes the predicate properties of `source` with
       * the corresponding property values of a given object, returning `true` if
       * all predicates return truthy, else `false`.
       *
       * **Note:** The created function is equivalent to `_.conformsTo` with
       * `source` partially applied.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {Object} source The object of property predicates to conform to.
       * @returns {Function} Returns the new spec function.
       * @example
       *
       * var objects = [
       *   { 'a': 2, 'b': 1 },
       *   { 'a': 1, 'b': 2 }
       * ];
       *
       * _.filter(objects, _.conforms({ 'b': function(n) { return n > 1; } }));
       * // => [{ 'a': 1, 'b': 2 }]
       */
      function conforms(source) {
        return baseConforms(baseClone(source, CLONE_DEEP_FLAG));
      }
  
      /**
       * Creates a function that returns `value`.
       *
       * @static
       * @memberOf _
       * @since 2.4.0
       * @category Util
       * @param {*} value The value to return from the new function.
       * @returns {Function} Returns the new constant function.
       * @example
       *
       * var objects = _.times(2, _.constant({ 'a': 1 }));
       *
       * console.log(objects);
       * // => [{ 'a': 1 }, { 'a': 1 }]
       *
       * console.log(objects[0] === objects[1]);
       * // => true
       */
      function constant(value) {
        return function() {
          return value;
        };
      }
  
      /**
       * Checks `value` to determine whether a default value should be returned in
       * its place. The `defaultValue` is returned if `value` is `NaN`, `null`,
       * or `undefined`.
       *
       * @static
       * @memberOf _
       * @since 4.14.0
       * @category Util
       * @param {*} value The value to check.
       * @param {*} defaultValue The default value.
       * @returns {*} Returns the resolved value.
       * @example
       *
       * _.defaultTo(1, 10);
       * // => 1
       *
       * _.defaultTo(undefined, 10);
       * // => 10
       */
      function defaultTo(value, defaultValue) {
        return (value == null || value !== value) ? defaultValue : value;
      }
  
      /**
       * Creates a function that returns the result of invoking the given functions
       * with the `this` binding of the created function, where each successive
       * invocation is supplied the return value of the previous.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Util
       * @param {...(Function|Function[])} [funcs] The functions to invoke.
       * @returns {Function} Returns the new composite function.
       * @see _.flowRight
       * @example
       *
       * function square(n) {
       *   return n * n;
       * }
       *
       * var addSquare = _.flow([_.add, square]);
       * addSquare(1, 2);
       * // => 9
       */
      var flow = createFlow();
  
      /**
       * This method is like `_.flow` except that it creates a function that
       * invokes the given functions from right to left.
       *
       * @static
       * @since 3.0.0
       * @memberOf _
       * @category Util
       * @param {...(Function|Function[])} [funcs] The functions to invoke.
       * @returns {Function} Returns the new composite function.
       * @see _.flow
       * @example
       *
       * function square(n) {
       *   return n * n;
       * }
       *
       * var addSquare = _.flowRight([square, _.add]);
       * addSquare(1, 2);
       * // => 9
       */
      var flowRight = createFlow(true);
  
      /**
       * This method returns the first argument it receives.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @param {*} value Any value.
       * @returns {*} Returns `value`.
       * @example
       *
       * var object = { 'a': 1 };
       *
       * console.log(_.identity(object) === object);
       * // => true
       */
      function identity(value) {
        return value;
      }
  
      /**
       * Creates a function that invokes `func` with the arguments of the created
       * function. If `func` is a property name, the created function returns the
       * property value for a given element. If `func` is an array or object, the
       * created function returns `true` for elements that contain the equivalent
       * source properties, otherwise it returns `false`.
       *
       * @static
       * @since 4.0.0
       * @memberOf _
       * @category Util
       * @param {*} [func=_.identity] The value to convert to a callback.
       * @returns {Function} Returns the callback.
       * @example
       *
       * var users = [
       *   { 'user': 'barney', 'age': 36, 'active': true },
       *   { 'user': 'fred',   'age': 40, 'active': false }
       * ];
       *
       * // The `_.matches` iteratee shorthand.
       * _.filter(users, _.iteratee({ 'user': 'barney', 'active': true }));
       * // => [{ 'user': 'barney', 'age': 36, 'active': true }]
       *
       * // The `_.matchesProperty` iteratee shorthand.
       * _.filter(users, _.iteratee(['user', 'fred']));
       * // => [{ 'user': 'fred', 'age': 40 }]
       *
       * // The `_.property` iteratee shorthand.
       * _.map(users, _.iteratee('user'));
       * // => ['barney', 'fred']
       *
       * // Create custom iteratee shorthands.
       * _.iteratee = _.wrap(_.iteratee, function(iteratee, func) {
       *   return !_.isRegExp(func) ? iteratee(func) : function(string) {
       *     return func.test(string);
       *   };
       * });
       *
       * _.filter(['abc', 'def'], /ef/);
       * // => ['def']
       */
      function iteratee(func) {
        return baseIteratee(typeof func == 'function' ? func : baseClone(func, CLONE_DEEP_FLAG));
      }
  
      /**
       * Creates a function that performs a partial deep comparison between a given
       * object and `source`, returning `true` if the given object has equivalent
       * property values, else `false`.
       *
       * **Note:** The created function is equivalent to `_.isMatch` with `source`
       * partially applied.
       *
       * Partial comparisons will match empty array and empty object `source`
       * values against any array or object value, respectively. See `_.isEqual`
       * for a list of supported value comparisons.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Util
       * @param {Object} source The object of property values to match.
       * @returns {Function} Returns the new spec function.
       * @example
       *
       * var objects = [
       *   { 'a': 1, 'b': 2, 'c': 3 },
       *   { 'a': 4, 'b': 5, 'c': 6 }
       * ];
       *
       * _.filter(objects, _.matches({ 'a': 4, 'c': 6 }));
       * // => [{ 'a': 4, 'b': 5, 'c': 6 }]
       */
      function matches(source) {
        return baseMatches(baseClone(source, CLONE_DEEP_FLAG));
      }
  
      /**
       * Creates a function that performs a partial deep comparison between the
       * value at `path` of a given object to `srcValue`, returning `true` if the
       * object value is equivalent, else `false`.
       *
       * **Note:** Partial comparisons will match empty array and empty object
       * `srcValue` values against any array or object value, respectively. See
       * `_.isEqual` for a list of supported value comparisons.
       *
       * @static
       * @memberOf _
       * @since 3.2.0
       * @category Util
       * @param {Array|string} path The path of the property to get.
       * @param {*} srcValue The value to match.
       * @returns {Function} Returns the new spec function.
       * @example
       *
       * var objects = [
       *   { 'a': 1, 'b': 2, 'c': 3 },
       *   { 'a': 4, 'b': 5, 'c': 6 }
       * ];
       *
       * _.find(objects, _.matchesProperty('a', 4));
       * // => { 'a': 4, 'b': 5, 'c': 6 }
       */
      function matchesProperty(path, srcValue) {
        return baseMatchesProperty(path, baseClone(srcValue, CLONE_DEEP_FLAG));
      }
  
      /**
       * Creates a function that invokes the method at `path` of a given object.
       * Any additional arguments are provided to the invoked method.
       *
       * @static
       * @memberOf _
       * @since 3.7.0
       * @category Util
       * @param {Array|string} path The path of the method to invoke.
       * @param {...*} [args] The arguments to invoke the method with.
       * @returns {Function} Returns the new invoker function.
       * @example
       *
       * var objects = [
       *   { 'a': { 'b': _.constant(2) } },
       *   { 'a': { 'b': _.constant(1) } }
       * ];
       *
       * _.map(objects, _.method('a.b'));
       * // => [2, 1]
       *
       * _.map(objects, _.method(['a', 'b']));
       * // => [2, 1]
       */
      var method = baseRest(function(path, args) {
        return function(object) {
          return baseInvoke(object, path, args);
        };
      });
  
      /**
       * The opposite of `_.method`; this method creates a function that invokes
       * the method at a given path of `object`. Any additional arguments are
       * provided to the invoked method.
       *
       * @static
       * @memberOf _
       * @since 3.7.0
       * @category Util
       * @param {Object} object The object to query.
       * @param {...*} [args] The arguments to invoke the method with.
       * @returns {Function} Returns the new invoker function.
       * @example
       *
       * var array = _.times(3, _.constant),
       *     object = { 'a': array, 'b': array, 'c': array };
       *
       * _.map(['a[2]', 'c[0]'], _.methodOf(object));
       * // => [2, 0]
       *
       * _.map([['a', '2'], ['c', '0']], _.methodOf(object));
       * // => [2, 0]
       */
      var methodOf = baseRest(function(object, args) {
        return function(path) {
          return baseInvoke(object, path, args);
        };
      });
  
      /**
       * Adds all own enumerable string keyed function properties of a source
       * object to the destination object. If `object` is a function, then methods
       * are added to its prototype as well.
       *
       * **Note:** Use `_.runInContext` to create a pristine `lodash` function to
       * avoid conflicts caused by modifying the original.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @param {Function|Object} [object=lodash] The destination object.
       * @param {Object} source The object of functions to add.
       * @param {Object} [options={}] The options object.
       * @param {boolean} [options.chain=true] Specify whether mixins are chainable.
       * @returns {Function|Object} Returns `object`.
       * @example
       *
       * function vowels(string) {
       *   return _.filter(string, function(v) {
       *     return /[aeiou]/i.test(v);
       *   });
       * }
       *
       * _.mixin({ 'vowels': vowels });
       * _.vowels('fred');
       * // => ['e']
       *
       * _('fred').vowels().value();
       * // => ['e']
       *
       * _.mixin({ 'vowels': vowels }, { 'chain': false });
       * _('fred').vowels();
       * // => ['e']
       */
      function mixin(object, source, options) {
        var props = keys(source),
            methodNames = baseFunctions(source, props);
  
        if (options == null &&
            !(isObject(source) && (methodNames.length || !props.length))) {
          options = source;
          source = object;
          object = this;
          methodNames = baseFunctions(source, keys(source));
        }
        var chain = !(isObject(options) && 'chain' in options) || !!options.chain,
            isFunc = isFunction(object);
  
        arrayEach(methodNames, function(methodName) {
          var func = source[methodName];
          object[methodName] = func;
          if (isFunc) {
            object.prototype[methodName] = function() {
              var chainAll = this.__chain__;
              if (chain || chainAll) {
                var result = object(this.__wrapped__),
                    actions = result.__actions__ = copyArray(this.__actions__);
  
                actions.push({ 'func': func, 'args': arguments, 'thisArg': object });
                result.__chain__ = chainAll;
                return result;
              }
              return func.apply(object, arrayPush([this.value()], arguments));
            };
          }
        });
  
        return object;
      }
  
      /**
       * Reverts the `_` variable to its previous value and returns a reference to
       * the `lodash` function.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @returns {Function} Returns the `lodash` function.
       * @example
       *
       * var lodash = _.noConflict();
       */
      function noConflict() {
        if (root._ === this) {
          root._ = oldDash;
        }
        return this;
      }
  
      /**
       * This method returns `undefined`.
       *
       * @static
       * @memberOf _
       * @since 2.3.0
       * @category Util
       * @example
       *
       * _.times(2, _.noop);
       * // => [undefined, undefined]
       */
      function noop() {
        // No operation performed.
      }
  
      /**
       * Creates a function that gets the argument at index `n`. If `n` is negative,
       * the nth argument from the end is returned.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {number} [n=0] The index of the argument to return.
       * @returns {Function} Returns the new pass-thru function.
       * @example
       *
       * var func = _.nthArg(1);
       * func('a', 'b', 'c', 'd');
       * // => 'b'
       *
       * var func = _.nthArg(-2);
       * func('a', 'b', 'c', 'd');
       * // => 'c'
       */
      function nthArg(n) {
        n = toInteger(n);
        return baseRest(function(args) {
          return baseNth(args, n);
        });
      }
  
      /**
       * Creates a function that invokes `iteratees` with the arguments it receives
       * and returns their results.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {...(Function|Function[])} [iteratees=[_.identity]]
       *  The iteratees to invoke.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var func = _.over([Math.max, Math.min]);
       *
       * func(1, 2, 3, 4);
       * // => [4, 1]
       */
      var over = createOver(arrayMap);
  
      /**
       * Creates a function that checks if **all** of the `predicates` return
       * truthy when invoked with the arguments it receives.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {...(Function|Function[])} [predicates=[_.identity]]
       *  The predicates to check.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var func = _.overEvery([Boolean, isFinite]);
       *
       * func('1');
       * // => true
       *
       * func(null);
       * // => false
       *
       * func(NaN);
       * // => false
       */
      var overEvery = createOver(arrayEvery);
  
      /**
       * Creates a function that checks if **any** of the `predicates` return
       * truthy when invoked with the arguments it receives.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {...(Function|Function[])} [predicates=[_.identity]]
       *  The predicates to check.
       * @returns {Function} Returns the new function.
       * @example
       *
       * var func = _.overSome([Boolean, isFinite]);
       *
       * func('1');
       * // => true
       *
       * func(null);
       * // => true
       *
       * func(NaN);
       * // => false
       */
      var overSome = createOver(arraySome);
  
      /**
       * Creates a function that returns the value at `path` of a given object.
       *
       * @static
       * @memberOf _
       * @since 2.4.0
       * @category Util
       * @param {Array|string} path The path of the property to get.
       * @returns {Function} Returns the new accessor function.
       * @example
       *
       * var objects = [
       *   { 'a': { 'b': 2 } },
       *   { 'a': { 'b': 1 } }
       * ];
       *
       * _.map(objects, _.property('a.b'));
       * // => [2, 1]
       *
       * _.map(_.sortBy(objects, _.property(['a', 'b'])), 'a.b');
       * // => [1, 2]
       */
      function property(path) {
        return isKey(path) ? baseProperty(toKey(path)) : basePropertyDeep(path);
      }
  
      /**
       * The opposite of `_.property`; this method creates a function that returns
       * the value at a given path of `object`.
       *
       * @static
       * @memberOf _
       * @since 3.0.0
       * @category Util
       * @param {Object} object The object to query.
       * @returns {Function} Returns the new accessor function.
       * @example
       *
       * var array = [0, 1, 2],
       *     object = { 'a': array, 'b': array, 'c': array };
       *
       * _.map(['a[2]', 'c[0]'], _.propertyOf(object));
       * // => [2, 0]
       *
       * _.map([['a', '2'], ['c', '0']], _.propertyOf(object));
       * // => [2, 0]
       */
      function propertyOf(object) {
        return function(path) {
          return object == null ? undefined : baseGet(object, path);
        };
      }
  
      /**
       * Creates an array of numbers (positive and/or negative) progressing from
       * `start` up to, but not including, `end`. A step of `-1` is used if a negative
       * `start` is specified without an `end` or `step`. If `end` is not specified,
       * it's set to `start` with `start` then set to `0`.
       *
       * **Note:** JavaScript follows the IEEE-754 standard for resolving
       * floating-point values which can produce unexpected results.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @param {number} [start=0] The start of the range.
       * @param {number} end The end of the range.
       * @param {number} [step=1] The value to increment or decrement by.
       * @returns {Array} Returns the range of numbers.
       * @see _.inRange, _.rangeRight
       * @example
       *
       * _.range(4);
       * // => [0, 1, 2, 3]
       *
       * _.range(-4);
       * // => [0, -1, -2, -3]
       *
       * _.range(1, 5);
       * // => [1, 2, 3, 4]
       *
       * _.range(0, 20, 5);
       * // => [0, 5, 10, 15]
       *
       * _.range(0, -4, -1);
       * // => [0, -1, -2, -3]
       *
       * _.range(1, 4, 0);
       * // => [1, 1, 1]
       *
       * _.range(0);
       * // => []
       */
      var range = createRange();
  
      /**
       * This method is like `_.range` except that it populates values in
       * descending order.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {number} [start=0] The start of the range.
       * @param {number} end The end of the range.
       * @param {number} [step=1] The value to increment or decrement by.
       * @returns {Array} Returns the range of numbers.
       * @see _.inRange, _.range
       * @example
       *
       * _.rangeRight(4);
       * // => [3, 2, 1, 0]
       *
       * _.rangeRight(-4);
       * // => [-3, -2, -1, 0]
       *
       * _.rangeRight(1, 5);
       * // => [4, 3, 2, 1]
       *
       * _.rangeRight(0, 20, 5);
       * // => [15, 10, 5, 0]
       *
       * _.rangeRight(0, -4, -1);
       * // => [-3, -2, -1, 0]
       *
       * _.rangeRight(1, 4, 0);
       * // => [1, 1, 1]
       *
       * _.rangeRight(0);
       * // => []
       */
      var rangeRight = createRange(true);
  
      /**
       * This method returns a new empty array.
       *
       * @static
       * @memberOf _
       * @since 4.13.0
       * @category Util
       * @returns {Array} Returns the new empty array.
       * @example
       *
       * var arrays = _.times(2, _.stubArray);
       *
       * console.log(arrays);
       * // => [[], []]
       *
       * console.log(arrays[0] === arrays[1]);
       * // => false
       */
      function stubArray() {
        return [];
      }
  
      /**
       * This method returns `false`.
       *
       * @static
       * @memberOf _
       * @since 4.13.0
       * @category Util
       * @returns {boolean} Returns `false`.
       * @example
       *
       * _.times(2, _.stubFalse);
       * // => [false, false]
       */
      function stubFalse() {
        return false;
      }
  
      /**
       * This method returns a new empty object.
       *
       * @static
       * @memberOf _
       * @since 4.13.0
       * @category Util
       * @returns {Object} Returns the new empty object.
       * @example
       *
       * var objects = _.times(2, _.stubObject);
       *
       * console.log(objects);
       * // => [{}, {}]
       *
       * console.log(objects[0] === objects[1]);
       * // => false
       */
      function stubObject() {
        return {};
      }
  
      /**
       * This method returns an empty string.
       *
       * @static
       * @memberOf _
       * @since 4.13.0
       * @category Util
       * @returns {string} Returns the empty string.
       * @example
       *
       * _.times(2, _.stubString);
       * // => ['', '']
       */
      function stubString() {
        return '';
      }
  
      /**
       * This method returns `true`.
       *
       * @static
       * @memberOf _
       * @since 4.13.0
       * @category Util
       * @returns {boolean} Returns `true`.
       * @example
       *
       * _.times(2, _.stubTrue);
       * // => [true, true]
       */
      function stubTrue() {
        return true;
      }
  
      /**
       * Invokes the iteratee `n` times, returning an array of the results of
       * each invocation. The iteratee is invoked with one argument; (index).
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @param {number} n The number of times to invoke `iteratee`.
       * @param {Function} [iteratee=_.identity] The function invoked per iteration.
       * @returns {Array} Returns the array of results.
       * @example
       *
       * _.times(3, String);
       * // => ['0', '1', '2']
       *
       *  _.times(4, _.constant(0));
       * // => [0, 0, 0, 0]
       */
      function times(n, iteratee) {
        n = toInteger(n);
        if (n < 1 || n > MAX_SAFE_INTEGER) {
          return [];
        }
        var index = MAX_ARRAY_LENGTH,
            length = nativeMin(n, MAX_ARRAY_LENGTH);
  
        iteratee = getIteratee(iteratee);
        n -= MAX_ARRAY_LENGTH;
  
        var result = baseTimes(length, iteratee);
        while (++index < n) {
          iteratee(index);
        }
        return result;
      }
  
      /**
       * Converts `value` to a property path array.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Util
       * @param {*} value The value to convert.
       * @returns {Array} Returns the new property path array.
       * @example
       *
       * _.toPath('a.b.c');
       * // => ['a', 'b', 'c']
       *
       * _.toPath('a[0].b.c');
       * // => ['a', '0', 'b', 'c']
       */
      function toPath(value) {
        if (isArray(value)) {
          return arrayMap(value, toKey);
        }
        return isSymbol(value) ? [value] : copyArray(stringToPath(toString(value)));
      }
  
      /**
       * Generates a unique ID. If `prefix` is given, the ID is appended to it.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Util
       * @param {string} [prefix=''] The value to prefix the ID with.
       * @returns {string} Returns the unique ID.
       * @example
       *
       * _.uniqueId('contact_');
       * // => 'contact_104'
       *
       * _.uniqueId();
       * // => '105'
       */
      function uniqueId(prefix) {
        var id = ++idCounter;
        return toString(prefix) + id;
      }
  
      /*------------------------------------------------------------------------*/
  
      /**
       * Adds two numbers.
       *
       * @static
       * @memberOf _
       * @since 3.4.0
       * @category Math
       * @param {number} augend The first number in an addition.
       * @param {number} addend The second number in an addition.
       * @returns {number} Returns the total.
       * @example
       *
       * _.add(6, 4);
       * // => 10
       */
      var add = createMathOperation(function(augend, addend) {
        return augend + addend;
      }, 0);
  
      /**
       * Computes `number` rounded up to `precision`.
       *
       * @static
       * @memberOf _
       * @since 3.10.0
       * @category Math
       * @param {number} number The number to round up.
       * @param {number} [precision=0] The precision to round up to.
       * @returns {number} Returns the rounded up number.
       * @example
       *
       * _.ceil(4.006);
       * // => 5
       *
       * _.ceil(6.004, 2);
       * // => 6.01
       *
       * _.ceil(6040, -2);
       * // => 6100
       */
      var ceil = createRound('ceil');
  
      /**
       * Divide two numbers.
       *
       * @static
       * @memberOf _
       * @since 4.7.0
       * @category Math
       * @param {number} dividend The first number in a division.
       * @param {number} divisor The second number in a division.
       * @returns {number} Returns the quotient.
       * @example
       *
       * _.divide(6, 4);
       * // => 1.5
       */
      var divide = createMathOperation(function(dividend, divisor) {
        return dividend / divisor;
      }, 1);
  
      /**
       * Computes `number` rounded down to `precision`.
       *
       * @static
       * @memberOf _
       * @since 3.10.0
       * @category Math
       * @param {number} number The number to round down.
       * @param {number} [precision=0] The precision to round down to.
       * @returns {number} Returns the rounded down number.
       * @example
       *
       * _.floor(4.006);
       * // => 4
       *
       * _.floor(0.046, 2);
       * // => 0.04
       *
       * _.floor(4060, -2);
       * // => 4000
       */
      var floor = createRound('floor');
  
      /**
       * Computes the maximum value of `array`. If `array` is empty or falsey,
       * `undefined` is returned.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Math
       * @param {Array} array The array to iterate over.
       * @returns {*} Returns the maximum value.
       * @example
       *
       * _.max([4, 2, 8, 6]);
       * // => 8
       *
       * _.max([]);
       * // => undefined
       */
      function max(array) {
        return (array && array.length)
          ? baseExtremum(array, identity, baseGt)
          : undefined;
      }
  
      /**
       * This method is like `_.max` except that it accepts `iteratee` which is
       * invoked for each element in `array` to generate the criterion by which
       * the value is ranked. The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Math
       * @param {Array} array The array to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {*} Returns the maximum value.
       * @example
       *
       * var objects = [{ 'n': 1 }, { 'n': 2 }];
       *
       * _.maxBy(objects, function(o) { return o.n; });
       * // => { 'n': 2 }
       *
       * // The `_.property` iteratee shorthand.
       * _.maxBy(objects, 'n');
       * // => { 'n': 2 }
       */
      function maxBy(array, iteratee) {
        return (array && array.length)
          ? baseExtremum(array, getIteratee(iteratee, 2), baseGt)
          : undefined;
      }
  
      /**
       * Computes the mean of the values in `array`.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Math
       * @param {Array} array The array to iterate over.
       * @returns {number} Returns the mean.
       * @example
       *
       * _.mean([4, 2, 8, 6]);
       * // => 5
       */
      function mean(array) {
        return baseMean(array, identity);
      }
  
      /**
       * This method is like `_.mean` except that it accepts `iteratee` which is
       * invoked for each element in `array` to generate the value to be averaged.
       * The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.7.0
       * @category Math
       * @param {Array} array The array to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {number} Returns the mean.
       * @example
       *
       * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
       *
       * _.meanBy(objects, function(o) { return o.n; });
       * // => 5
       *
       * // The `_.property` iteratee shorthand.
       * _.meanBy(objects, 'n');
       * // => 5
       */
      function meanBy(array, iteratee) {
        return baseMean(array, getIteratee(iteratee, 2));
      }
  
      /**
       * Computes the minimum value of `array`. If `array` is empty or falsey,
       * `undefined` is returned.
       *
       * @static
       * @since 0.1.0
       * @memberOf _
       * @category Math
       * @param {Array} array The array to iterate over.
       * @returns {*} Returns the minimum value.
       * @example
       *
       * _.min([4, 2, 8, 6]);
       * // => 2
       *
       * _.min([]);
       * // => undefined
       */
      function min(array) {
        return (array && array.length)
          ? baseExtremum(array, identity, baseLt)
          : undefined;
      }
  
      /**
       * This method is like `_.min` except that it accepts `iteratee` which is
       * invoked for each element in `array` to generate the criterion by which
       * the value is ranked. The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Math
       * @param {Array} array The array to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {*} Returns the minimum value.
       * @example
       *
       * var objects = [{ 'n': 1 }, { 'n': 2 }];
       *
       * _.minBy(objects, function(o) { return o.n; });
       * // => { 'n': 1 }
       *
       * // The `_.property` iteratee shorthand.
       * _.minBy(objects, 'n');
       * // => { 'n': 1 }
       */
      function minBy(array, iteratee) {
        return (array && array.length)
          ? baseExtremum(array, getIteratee(iteratee, 2), baseLt)
          : undefined;
      }
  
      /**
       * Multiply two numbers.
       *
       * @static
       * @memberOf _
       * @since 4.7.0
       * @category Math
       * @param {number} multiplier The first number in a multiplication.
       * @param {number} multiplicand The second number in a multiplication.
       * @returns {number} Returns the product.
       * @example
       *
       * _.multiply(6, 4);
       * // => 24
       */
      var multiply = createMathOperation(function(multiplier, multiplicand) {
        return multiplier * multiplicand;
      }, 1);
  
      /**
       * Computes `number` rounded to `precision`.
       *
       * @static
       * @memberOf _
       * @since 3.10.0
       * @category Math
       * @param {number} number The number to round.
       * @param {number} [precision=0] The precision to round to.
       * @returns {number} Returns the rounded number.
       * @example
       *
       * _.round(4.006);
       * // => 4
       *
       * _.round(4.006, 2);
       * // => 4.01
       *
       * _.round(4060, -2);
       * // => 4100
       */
      var round = createRound('round');
  
      /**
       * Subtract two numbers.
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Math
       * @param {number} minuend The first number in a subtraction.
       * @param {number} subtrahend The second number in a subtraction.
       * @returns {number} Returns the difference.
       * @example
       *
       * _.subtract(6, 4);
       * // => 2
       */
      var subtract = createMathOperation(function(minuend, subtrahend) {
        return minuend - subtrahend;
      }, 0);
  
      /**
       * Computes the sum of the values in `array`.
       *
       * @static
       * @memberOf _
       * @since 3.4.0
       * @category Math
       * @param {Array} array The array to iterate over.
       * @returns {number} Returns the sum.
       * @example
       *
       * _.sum([4, 2, 8, 6]);
       * // => 20
       */
      function sum(array) {
        return (array && array.length)
          ? baseSum(array, identity)
          : 0;
      }
  
      /**
       * This method is like `_.sum` except that it accepts `iteratee` which is
       * invoked for each element in `array` to generate the value to be summed.
       * The iteratee is invoked with one argument: (value).
       *
       * @static
       * @memberOf _
       * @since 4.0.0
       * @category Math
       * @param {Array} array The array to iterate over.
       * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
       * @returns {number} Returns the sum.
       * @example
       *
       * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
       *
       * _.sumBy(objects, function(o) { return o.n; });
       * // => 20
       *
       * // The `_.property` iteratee shorthand.
       * _.sumBy(objects, 'n');
       * // => 20
       */
      function sumBy(array, iteratee) {
        return (array && array.length)
          ? baseSum(array, getIteratee(iteratee, 2))
          : 0;
      }
  
      /*------------------------------------------------------------------------*/
  
      // Add methods that return wrapped values in chain sequences.
      lodash.after = after;
      lodash.ary = ary;
      lodash.assign = assign;
      lodash.assignIn = assignIn;
      lodash.assignInWith = assignInWith;
      lodash.assignWith = assignWith;
      lodash.at = at;
      lodash.before = before;
      lodash.bind = bind;
      lodash.bindAll = bindAll;
      lodash.bindKey = bindKey;
      lodash.castArray = castArray;
      lodash.chain = chain;
      lodash.chunk = chunk;
      lodash.compact = compact;
      lodash.concat = concat;
      lodash.cond = cond;
      lodash.conforms = conforms;
      lodash.constant = constant;
      lodash.countBy = countBy;
      lodash.create = create;
      lodash.curry = curry;
      lodash.curryRight = curryRight;
      lodash.debounce = debounce;
      lodash.defaults = defaults;
      lodash.defaultsDeep = defaultsDeep;
      lodash.defer = defer;
      lodash.delay = delay;
      lodash.difference = difference;
      lodash.differenceBy = differenceBy;
      lodash.differenceWith = differenceWith;
      lodash.drop = drop;
      lodash.dropRight = dropRight;
      lodash.dropRightWhile = dropRightWhile;
      lodash.dropWhile = dropWhile;
      lodash.fill = fill;
      lodash.filter = filter;
      lodash.flatMap = flatMap;
      lodash.flatMapDeep = flatMapDeep;
      lodash.flatMapDepth = flatMapDepth;
      lodash.flatten = flatten;
      lodash.flattenDeep = flattenDeep;
      lodash.flattenDepth = flattenDepth;
      lodash.flip = flip;
      lodash.flow = flow;
      lodash.flowRight = flowRight;
      lodash.fromPairs = fromPairs;
      lodash.functions = functions;
      lodash.functionsIn = functionsIn;
      lodash.groupBy = groupBy;
      lodash.initial = initial;
      lodash.intersection = intersection;
      lodash.intersectionBy = intersectionBy;
      lodash.intersectionWith = intersectionWith;
      lodash.invert = invert;
      lodash.invertBy = invertBy;
      lodash.invokeMap = invokeMap;
      lodash.iteratee = iteratee;
      lodash.keyBy = keyBy;
      lodash.keys = keys;
      lodash.keysIn = keysIn;
      lodash.map = map;
      lodash.mapKeys = mapKeys;
      lodash.mapValues = mapValues;
      lodash.matches = matches;
      lodash.matchesProperty = matchesProperty;
      lodash.memoize = memoize;
      lodash.merge = merge;
      lodash.mergeWith = mergeWith;
      lodash.method = method;
      lodash.methodOf = methodOf;
      lodash.mixin = mixin;
      lodash.negate = negate;
      lodash.nthArg = nthArg;
      lodash.omit = omit;
      lodash.omitBy = omitBy;
      lodash.once = once;
      lodash.orderBy = orderBy;
      lodash.over = over;
      lodash.overArgs = overArgs;
      lodash.overEvery = overEvery;
      lodash.overSome = overSome;
      lodash.partial = partial;
      lodash.partialRight = partialRight;
      lodash.partition = partition;
      lodash.pick = pick;
      lodash.pickBy = pickBy;
      lodash.property = property;
      lodash.propertyOf = propertyOf;
      lodash.pull = pull;
      lodash.pullAll = pullAll;
      lodash.pullAllBy = pullAllBy;
      lodash.pullAllWith = pullAllWith;
      lodash.pullAt = pullAt;
      lodash.range = range;
      lodash.rangeRight = rangeRight;
      lodash.rearg = rearg;
      lodash.reject = reject;
      lodash.remove = remove;
      lodash.rest = rest;
      lodash.reverse = reverse;
      lodash.sampleSize = sampleSize;
      lodash.set = set;
      lodash.setWith = setWith;
      lodash.shuffle = shuffle;
      lodash.slice = slice;
      lodash.sortBy = sortBy;
      lodash.sortedUniq = sortedUniq;
      lodash.sortedUniqBy = sortedUniqBy;
      lodash.split = split;
      lodash.spread = spread;
      lodash.tail = tail;
      lodash.take = take;
      lodash.takeRight = takeRight;
      lodash.takeRightWhile = takeRightWhile;
      lodash.takeWhile = takeWhile;
      lodash.tap = tap;
      lodash.throttle = throttle;
      lodash.thru = thru;
      lodash.toArray = toArray;
      lodash.toPairs = toPairs;
      lodash.toPairsIn = toPairsIn;
      lodash.toPath = toPath;
      lodash.toPlainObject = toPlainObject;
      lodash.transform = transform;
      lodash.unary = unary;
      lodash.union = union;
      lodash.unionBy = unionBy;
      lodash.unionWith = unionWith;
      lodash.uniq = uniq;
      lodash.uniqBy = uniqBy;
      lodash.uniqWith = uniqWith;
      lodash.unset = unset;
      lodash.unzip = unzip;
      lodash.unzipWith = unzipWith;
      lodash.update = update;
      lodash.updateWith = updateWith;
      lodash.values = values;
      lodash.valuesIn = valuesIn;
      lodash.without = without;
      lodash.words = words;
      lodash.wrap = wrap;
      lodash.xor = xor;
      lodash.xorBy = xorBy;
      lodash.xorWith = xorWith;
      lodash.zip = zip;
      lodash.zipObject = zipObject;
      lodash.zipObjectDeep = zipObjectDeep;
      lodash.zipWith = zipWith;
  
      // Add aliases.
      lodash.entries = toPairs;
      lodash.entriesIn = toPairsIn;
      lodash.extend = assignIn;
      lodash.extendWith = assignInWith;
  
      // Add methods to `lodash.prototype`.
      mixin(lodash, lodash);
  
      /*------------------------------------------------------------------------*/
  
      // Add methods that return unwrapped values in chain sequences.
      lodash.add = add;
      lodash.attempt = attempt;
      lodash.camelCase = camelCase;
      lodash.capitalize = capitalize;
      lodash.ceil = ceil;
      lodash.clamp = clamp;
      lodash.clone = clone;
      lodash.cloneDeep = cloneDeep;
      lodash.cloneDeepWith = cloneDeepWith;
      lodash.cloneWith = cloneWith;
      lodash.conformsTo = conformsTo;
      lodash.deburr = deburr;
      lodash.defaultTo = defaultTo;
      lodash.divide = divide;
      lodash.endsWith = endsWith;
      lodash.eq = eq;
      lodash.escape = escape;
      lodash.escapeRegExp = escapeRegExp;
      lodash.every = every;
      lodash.find = find;
      lodash.findIndex = findIndex;
      lodash.findKey = findKey;
      lodash.findLast = findLast;
      lodash.findLastIndex = findLastIndex;
      lodash.findLastKey = findLastKey;
      lodash.floor = floor;
      lodash.forEach = forEach;
      lodash.forEachRight = forEachRight;
      lodash.forIn = forIn;
      lodash.forInRight = forInRight;
      lodash.forOwn = forOwn;
      lodash.forOwnRight = forOwnRight;
      lodash.get = get;
      lodash.gt = gt;
      lodash.gte = gte;
      lodash.has = has;
      lodash.hasIn = hasIn;
      lodash.head = head;
      lodash.identity = identity;
      lodash.includes = includes;
      lodash.indexOf = indexOf;
      lodash.inRange = inRange;
      lodash.invoke = invoke;
      lodash.isArguments = isArguments;
      lodash.isArray = isArray;
      lodash.isArrayBuffer = isArrayBuffer;
      lodash.isArrayLike = isArrayLike;
      lodash.isArrayLikeObject = isArrayLikeObject;
      lodash.isBoolean = isBoolean;
      lodash.isBuffer = isBuffer;
      lodash.isDate = isDate;
      lodash.isElement = isElement;
      lodash.isEmpty = isEmpty;
      lodash.isEqual = isEqual;
      lodash.isEqualWith = isEqualWith;
      lodash.isError = isError;
      lodash.isFinite = isFinite;
      lodash.isFunction = isFunction;
      lodash.isInteger = isInteger;
      lodash.isLength = isLength;
      lodash.isMap = isMap;
      lodash.isMatch = isMatch;
      lodash.isMatchWith = isMatchWith;
      lodash.isNaN = isNaN;
      lodash.isNative = isNative;
      lodash.isNil = isNil;
      lodash.isNull = isNull;
      lodash.isNumber = isNumber;
      lodash.isObject = isObject;
      lodash.isObjectLike = isObjectLike;
      lodash.isPlainObject = isPlainObject;
      lodash.isRegExp = isRegExp;
      lodash.isSafeInteger = isSafeInteger;
      lodash.isSet = isSet;
      lodash.isString = isString;
      lodash.isSymbol = isSymbol;
      lodash.isTypedArray = isTypedArray;
      lodash.isUndefined = isUndefined;
      lodash.isWeakMap = isWeakMap;
      lodash.isWeakSet = isWeakSet;
      lodash.join = join;
      lodash.kebabCase = kebabCase;
      lodash.last = last;
      lodash.lastIndexOf = lastIndexOf;
      lodash.lowerCase = lowerCase;
      lodash.lowerFirst = lowerFirst;
      lodash.lt = lt;
      lodash.lte = lte;
      lodash.max = max;
      lodash.maxBy = maxBy;
      lodash.mean = mean;
      lodash.meanBy = meanBy;
      lodash.min = min;
      lodash.minBy = minBy;
      lodash.stubArray = stubArray;
      lodash.stubFalse = stubFalse;
      lodash.stubObject = stubObject;
      lodash.stubString = stubString;
      lodash.stubTrue = stubTrue;
      lodash.multiply = multiply;
      lodash.nth = nth;
      lodash.noConflict = noConflict;
      lodash.noop = noop;
      lodash.now = now;
      lodash.pad = pad;
      lodash.padEnd = padEnd;
      lodash.padStart = padStart;
      lodash.parseInt = parseInt;
      lodash.random = random;
      lodash.reduce = reduce;
      lodash.reduceRight = reduceRight;
      lodash.repeat = repeat;
      lodash.replace = replace;
      lodash.result = result;
      lodash.round = round;
      lodash.runInContext = runInContext;
      lodash.sample = sample;
      lodash.size = size;
      lodash.snakeCase = snakeCase;
      lodash.some = some;
      lodash.sortedIndex = sortedIndex;
      lodash.sortedIndexBy = sortedIndexBy;
      lodash.sortedIndexOf = sortedIndexOf;
      lodash.sortedLastIndex = sortedLastIndex;
      lodash.sortedLastIndexBy = sortedLastIndexBy;
      lodash.sortedLastIndexOf = sortedLastIndexOf;
      lodash.startCase = startCase;
      lodash.startsWith = startsWith;
      lodash.subtract = subtract;
      lodash.sum = sum;
      lodash.sumBy = sumBy;
      lodash.template = template;
      lodash.times = times;
      lodash.toFinite = toFinite;
      lodash.toInteger = toInteger;
      lodash.toLength = toLength;
      lodash.toLower = toLower;
      lodash.toNumber = toNumber;
      lodash.toSafeInteger = toSafeInteger;
      lodash.toString = toString;
      lodash.toUpper = toUpper;
      lodash.trim = trim;
      lodash.trimEnd = trimEnd;
      lodash.trimStart = trimStart;
      lodash.truncate = truncate;
      lodash.unescape = unescape;
      lodash.uniqueId = uniqueId;
      lodash.upperCase = upperCase;
      lodash.upperFirst = upperFirst;
  
      // Add aliases.
      lodash.each = forEach;
      lodash.eachRight = forEachRight;
      lodash.first = head;
  
      mixin(lodash, (function() {
        var source = {};
        baseForOwn(lodash, function(func, methodName) {
          if (!hasOwnProperty.call(lodash.prototype, methodName)) {
            source[methodName] = func;
          }
        });
        return source;
      }()), { 'chain': false });
  
      /*------------------------------------------------------------------------*/
  
      /**
       * The semantic version number.
       *
       * @static
       * @memberOf _
       * @type {string}
       */
      lodash.VERSION = VERSION;
  
      // Assign default placeholders.
      arrayEach(['bind', 'bindKey', 'curry', 'curryRight', 'partial', 'partialRight'], function(methodName) {
        lodash[methodName].placeholder = lodash;
      });
  
      // Add `LazyWrapper` methods for `_.drop` and `_.take` variants.
      arrayEach(['drop', 'take'], function(methodName, index) {
        LazyWrapper.prototype[methodName] = function(n) {
          n = n === undefined ? 1 : nativeMax(toInteger(n), 0);
  
          var result = (this.__filtered__ && !index)
            ? new LazyWrapper(this)
            : this.clone();
  
          if (result.__filtered__) {
            result.__takeCount__ = nativeMin(n, result.__takeCount__);
          } else {
            result.__views__.push({
              'size': nativeMin(n, MAX_ARRAY_LENGTH),
              'type': methodName + (result.__dir__ < 0 ? 'Right' : '')
            });
          }
          return result;
        };
  
        LazyWrapper.prototype[methodName + 'Right'] = function(n) {
          return this.reverse()[methodName](n).reverse();
        };
      });
  
      // Add `LazyWrapper` methods that accept an `iteratee` value.
      arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) {
        var type = index + 1,
            isFilter = type == LAZY_FILTER_FLAG || type == LAZY_WHILE_FLAG;
  
        LazyWrapper.prototype[methodName] = function(iteratee) {
          var result = this.clone();
          result.__iteratees__.push({
            'iteratee': getIteratee(iteratee, 3),
            'type': type
          });
          result.__filtered__ = result.__filtered__ || isFilter;
          return result;
        };
      });
  
      // Add `LazyWrapper` methods for `_.head` and `_.last`.
      arrayEach(['head', 'last'], function(methodName, index) {
        var takeName = 'take' + (index ? 'Right' : '');
  
        LazyWrapper.prototype[methodName] = function() {
          return this[takeName](1).value()[0];
        };
      });
  
      // Add `LazyWrapper` methods for `_.initial` and `_.tail`.
      arrayEach(['initial', 'tail'], function(methodName, index) {
        var dropName = 'drop' + (index ? '' : 'Right');
  
        LazyWrapper.prototype[methodName] = function() {
          return this.__filtered__ ? new LazyWrapper(this) : this[dropName](1);
        };
      });
  
      LazyWrapper.prototype.compact = function() {
        return this.filter(identity);
      };
  
      LazyWrapper.prototype.find = function(predicate) {
        return this.filter(predicate).head();
      };
  
      LazyWrapper.prototype.findLast = function(predicate) {
        return this.reverse().find(predicate);
      };
  
      LazyWrapper.prototype.invokeMap = baseRest(function(path, args) {
        if (typeof path == 'function') {
          return new LazyWrapper(this);
        }
        return this.map(function(value) {
          return baseInvoke(value, path, args);
        });
      });
  
      LazyWrapper.prototype.reject = function(predicate) {
        return this.filter(negate(getIteratee(predicate)));
      };
  
      LazyWrapper.prototype.slice = function(start, end) {
        start = toInteger(start);
  
        var result = this;
        if (result.__filtered__ && (start > 0 || end < 0)) {
          return new LazyWrapper(result);
        }
        if (start < 0) {
          result = result.takeRight(-start);
        } else if (start) {
          result = result.drop(start);
        }
        if (end !== undefined) {
          end = toInteger(end);
          result = end < 0 ? result.dropRight(-end) : result.take(end - start);
        }
        return result;
      };
  
      LazyWrapper.prototype.takeRightWhile = function(predicate) {
        return this.reverse().takeWhile(predicate).reverse();
      };
  
      LazyWrapper.prototype.toArray = function() {
        return this.take(MAX_ARRAY_LENGTH);
      };
  
      // Add `LazyWrapper` methods to `lodash.prototype`.
      baseForOwn(LazyWrapper.prototype, function(func, methodName) {
        var checkIteratee = /^(?:filter|find|map|reject)|While$/.test(methodName),
            isTaker = /^(?:head|last)$/.test(methodName),
            lodashFunc = lodash[isTaker ? ('take' + (methodName == 'last' ? 'Right' : '')) : methodName],
            retUnwrapped = isTaker || /^find/.test(methodName);
  
        if (!lodashFunc) {
          return;
        }
        lodash.prototype[methodName] = function() {
          var value = this.__wrapped__,
              args = isTaker ? [1] : arguments,
              isLazy = value instanceof LazyWrapper,
              iteratee = args[0],
              useLazy = isLazy || isArray(value);
  
          var interceptor = function(value) {
            var result = lodashFunc.apply(lodash, arrayPush([value], args));
            return (isTaker && chainAll) ? result[0] : result;
          };
  
          if (useLazy && checkIteratee && typeof iteratee == 'function' && iteratee.length != 1) {
            // Avoid lazy use if the iteratee has a "length" value other than `1`.
            isLazy = useLazy = false;
          }
          var chainAll = this.__chain__,
              isHybrid = !!this.__actions__.length,
              isUnwrapped = retUnwrapped && !chainAll,
              onlyLazy = isLazy && !isHybrid;
  
          if (!retUnwrapped && useLazy) {
            value = onlyLazy ? value : new LazyWrapper(this);
            var result = func.apply(value, args);
            result.__actions__.push({ 'func': thru, 'args': [interceptor], 'thisArg': undefined });
            return new LodashWrapper(result, chainAll);
          }
          if (isUnwrapped && onlyLazy) {
            return func.apply(this, args);
          }
          result = this.thru(interceptor);
          return isUnwrapped ? (isTaker ? result.value()[0] : result.value()) : result;
        };
      });
  
      // Add `Array` methods to `lodash.prototype`.
      arrayEach(['pop', 'push', 'shift', 'sort', 'splice', 'unshift'], function(methodName) {
        var func = arrayProto[methodName],
            chainName = /^(?:push|sort|unshift)$/.test(methodName) ? 'tap' : 'thru',
            retUnwrapped = /^(?:pop|shift)$/.test(methodName);
  
        lodash.prototype[methodName] = function() {
          var args = arguments;
          if (retUnwrapped && !this.__chain__) {
            var value = this.value();
            return func.apply(isArray(value) ? value : [], args);
          }
          return this[chainName](function(value) {
            return func.apply(isArray(value) ? value : [], args);
          });
        };
      });
  
      // Map minified method names to their real names.
      baseForOwn(LazyWrapper.prototype, function(func, methodName) {
        var lodashFunc = lodash[methodName];
        if (lodashFunc) {
          var key = (lodashFunc.name + ''),
              names = realNames[key] || (realNames[key] = []);
  
          names.push({ 'name': methodName, 'func': lodashFunc });
        }
      });
  
      realNames[createHybrid(undefined, WRAP_BIND_KEY_FLAG).name] = [{
        'name': 'wrapper',
        'func': undefined
      }];
  
      // Add methods to `LazyWrapper`.
      LazyWrapper.prototype.clone = lazyClone;
      LazyWrapper.prototype.reverse = lazyReverse;
      LazyWrapper.prototype.value = lazyValue;
  
      // Add chain sequence methods to the `lodash` wrapper.
      lodash.prototype.at = wrapperAt;
      lodash.prototype.chain = wrapperChain;
      lodash.prototype.commit = wrapperCommit;
      lodash.prototype.next = wrapperNext;
      lodash.prototype.plant = wrapperPlant;
      lodash.prototype.reverse = wrapperReverse;
      lodash.prototype.toJSON = lodash.prototype.valueOf = lodash.prototype.value = wrapperValue;
  
      // Add lazy aliases.
      lodash.prototype.first = lodash.prototype.head;
  
      if (symIterator) {
        lodash.prototype[symIterator] = wrapperToIterator;
      }
      return lodash;
    });
  
    /*--------------------------------------------------------------------------*/
  
    // Export lodash.
    var _ = runInContext();
  
    // Some AMD build optimizers, like r.js, check for condition patterns like:
    if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
      // Expose Lodash on the global object to prevent errors when Lodash is
      // loaded by a script tag in the presence of an AMD loader.
      // See http://requirejs.org/docs/errors.html#mismatch for more details.
      // Use `_.noConflict` to remove Lodash from the global object.
      root._ = _;
  
      // Define as an anonymous module so, through path mapping, it can be
      // referenced as the "underscore" module.
      define(function() {
        return _;
      });
    }
    // Check for `exports` after `define` in case a build optimizer adds it.
    else if (freeModule) {
      // Export for Node.js.
      (freeModule.exports = _)._ = _;
      // Export for CommonJS support.
      freeExports._ = _;
    }
    else {
      // Export to the global object.
      root._ = _;
    }
  }.call(this));
  
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{}],14:[function(require,module,exports){
  'use strict'
  
  var ops = require('ndarray-ops')
  var ndarray = require('ndarray')
  var pool = require('typedarray-pool')
  var fftm = require('./lib/fft-matrix.js')
  
  function ndfft(dir, x, y) {
    var shape = x.shape
      , d = shape.length
      , size = 1
      , stride = new Array(d)
      , pad = 0
      , i, j
    for(i=d-1; i>=0; --i) {
      stride[i] = size
      size *= shape[i]
      pad = Math.max(pad, fftm.scratchMemory(shape[i]))
      if(x.shape[i] !== y.shape[i]) {
        throw new Error('Shape mismatch, real and imaginary arrays must have same size')
      }
    }
    var buf_size = 4 * size + pad
    var buffer
    if( x.dtype === 'array' ||
        x.dtype === 'float64' ||
        x.dtype === 'custom' ) {
      buffer = pool.mallocDouble(buf_size)
    } else {
      buffer = pool.mallocFloat(buf_size)
    }
    var x1 = ndarray(buffer, shape.slice(0), stride, 0)
      , y1 = ndarray(buffer, shape.slice(0), stride.slice(0), size)
      , x2 = ndarray(buffer, shape.slice(0), stride.slice(0), 2*size)
      , y2 = ndarray(buffer, shape.slice(0), stride.slice(0), 3*size)
      , tmp, n, s1, s2
      , scratch_ptr = 4 * size
    
    //Copy into x1/y1
    ops.assign(x1, x)
    ops.assign(y1, y)
    
    for(i=d-1; i>=0; --i) {
      fftm(dir, size/shape[i], shape[i], buffer, x1.offset, y1.offset, scratch_ptr)
      if(i === 0) {
        break
      }
      
      //Compute new stride for x2/y2
      n = 1
      s1 = x2.stride
      s2 = y2.stride
      for(j=i-1; j<d; ++j) {
        s2[j] = s1[j] = n
        n *= shape[j]
      }
      for(j=i-2; j>=0; --j) {
        s2[j] = s1[j] = n
        n *= shape[j]
      }
      
      //Transpose
      ops.assign(x2, x1)
      ops.assign(y2, y1)
      
      //Swap buffers
      tmp = x1
      x1 = x2
      x2 = tmp
      tmp = y1
      y1 = y2
      y2 = tmp
    }
    
    //Copy result back into x
    ops.assign(x, x1)
    ops.assign(y, y1)
    
    pool.free(buffer)
  }
  
  module.exports = ndfft
  },{"./lib/fft-matrix.js":15,"ndarray":19,"ndarray-ops":18,"typedarray-pool":22}],15:[function(require,module,exports){
  var bits = require('bit-twiddle')
  
  function fft(dir, nrows, ncols, buffer, x_ptr, y_ptr, scratch_ptr) {
    dir |= 0
    nrows |= 0
    ncols |= 0
    x_ptr |= 0
    y_ptr |= 0
    if(bits.isPow2(ncols)) {
      fftRadix2(dir, nrows, ncols, buffer, x_ptr, y_ptr)
    } else {
      fftBluestein(dir, nrows, ncols, buffer, x_ptr, y_ptr, scratch_ptr)
    }
  }
  module.exports = fft
  
  function scratchMemory(n) {
    if(bits.isPow2(n)) {
      return 0
    }
    return 2 * n + 4 * bits.nextPow2(2*n + 1)
  }
  module.exports.scratchMemory = scratchMemory
  
  
  //Radix 2 FFT Adapted from Paul Bourke's C Implementation
  function fftRadix2(dir, nrows, ncols, buffer, x_ptr, y_ptr) {
    dir |= 0
    nrows |= 0
    ncols |= 0
    x_ptr |= 0
    y_ptr |= 0
    var nn,m,i,i1,j,k,i2,l,l1,l2
    var c1,c2,t,t1,t2,u1,u2,z,row,a,b,c,d,k1,k2,k3
    
    // Calculate the number of points
    nn = ncols
    m = bits.log2(nn)
    
    for(row=0; row<nrows; ++row) {  
      // Do the bit reversal
      i2 = nn >> 1;
      j = 0;
      for(i=0;i<nn-1;i++) {
        if(i < j) {
          t = buffer[x_ptr+i]
          buffer[x_ptr+i] = buffer[x_ptr+j]
          buffer[x_ptr+j] = t
          t = buffer[y_ptr+i]
          buffer[y_ptr+i] = buffer[y_ptr+j]
          buffer[y_ptr+j] = t
        }
        k = i2
        while(k <= j) {
          j -= k
          k >>= 1
        }
        j += k
      }
      
      // Compute the FFT
      c1 = -1.0
      c2 = 0.0
      l2 = 1
      for(l=0;l<m;l++) {
        l1 = l2
        l2 <<= 1
        u1 = 1.0
        u2 = 0.0
        for(j=0;j<l1;j++) {
          for(i=j;i<nn;i+=l2) {
            i1 = i + l1
            a = buffer[x_ptr+i1]
            b = buffer[y_ptr+i1]
            c = buffer[x_ptr+i]
            d = buffer[y_ptr+i]
            k1 = u1 * (a + b)
            k2 = a * (u2 - u1)
            k3 = b * (u1 + u2)
            t1 = k1 - k3
            t2 = k1 + k2
            buffer[x_ptr+i1] = c - t1
            buffer[y_ptr+i1] = d - t2
            buffer[x_ptr+i] += t1
            buffer[y_ptr+i] += t2
          }
          k1 = c1 * (u1 + u2)
          k2 = u1 * (c2 - c1)
          k3 = u2 * (c1 + c2)
          u1 = k1 - k3
          u2 = k1 + k2
        }
        c2 = Math.sqrt((1.0 - c1) / 2.0)
        if(dir < 0) {
          c2 = -c2
        }
        c1 = Math.sqrt((1.0 + c1) / 2.0)
      }
      
      // Scaling for inverse transform
      if(dir < 0) {
        var scale_f = 1.0 / nn
        for(i=0;i<nn;i++) {
          buffer[x_ptr+i] *= scale_f
          buffer[y_ptr+i] *= scale_f
        }
      }
      
      // Advance pointers
      x_ptr += ncols
      y_ptr += ncols
    }
  }
  
  // Use Bluestein algorithm for npot FFTs
  // Scratch memory required:  2 * ncols + 4 * bits.nextPow2(2*ncols + 1)
  function fftBluestein(dir, nrows, ncols, buffer, x_ptr, y_ptr, scratch_ptr) {
    dir |= 0
    nrows |= 0
    ncols |= 0
    x_ptr |= 0
    y_ptr |= 0
    scratch_ptr |= 0
  
    // Initialize tables
    var m = bits.nextPow2(2 * ncols + 1)
      , cos_ptr = scratch_ptr
      , sin_ptr = cos_ptr + ncols
      , xs_ptr  = sin_ptr + ncols
      , ys_ptr  = xs_ptr  + m
      , cft_ptr = ys_ptr  + m
      , sft_ptr = cft_ptr + m
      , w = -dir * Math.PI / ncols
      , row, a, b, c, d, k1, k2, k3
      , i
    for(i=0; i<ncols; ++i) {
      a = w * ((i * i) % (ncols * 2))
      c = Math.cos(a)
      d = Math.sin(a)
      buffer[cft_ptr+(m-i)] = buffer[cft_ptr+i] = buffer[cos_ptr+i] = c
      buffer[sft_ptr+(m-i)] = buffer[sft_ptr+i] = buffer[sin_ptr+i] = d
    }
    for(i=ncols; i<=m-ncols; ++i) {
      buffer[cft_ptr+i] = 0.0
    }
    for(i=ncols; i<=m-ncols; ++i) {
      buffer[sft_ptr+i] = 0.0
    }
  
    fftRadix2(1, 1, m, buffer, cft_ptr, sft_ptr)
    
    //Compute scale factor
    if(dir < 0) {
      w = 1.0 / ncols
    } else {
      w = 1.0
    }
    
    //Handle direction
    for(row=0; row<nrows; ++row) {
    
      // Copy row into scratch memory, multiply weights
      for(i=0; i<ncols; ++i) {
        a = buffer[x_ptr+i]
        b = buffer[y_ptr+i]
        c = buffer[cos_ptr+i]
        d = -buffer[sin_ptr+i]
        k1 = c * (a + b)
        k2 = a * (d - c)
        k3 = b * (c + d)
        buffer[xs_ptr+i] = k1 - k3
        buffer[ys_ptr+i] = k1 + k2
      }
      //Zero out the rest
      for(i=ncols; i<m; ++i) {
        buffer[xs_ptr+i] = 0.0
      }
      for(i=ncols; i<m; ++i) {
        buffer[ys_ptr+i] = 0.0
      }
      
      // FFT buffer
      fftRadix2(1, 1, m, buffer, xs_ptr, ys_ptr)
      
      // Apply multiplier
      for(i=0; i<m; ++i) {
        a = buffer[xs_ptr+i]
        b = buffer[ys_ptr+i]
        c = buffer[cft_ptr+i]
        d = buffer[sft_ptr+i]
        k1 = c * (a + b)
        k2 = a * (d - c)
        k3 = b * (c + d)
        buffer[xs_ptr+i] = k1 - k3
        buffer[ys_ptr+i] = k1 + k2
      }
      
      // Inverse FFT buffer
      fftRadix2(-1, 1, m, buffer, xs_ptr, ys_ptr)
      
      // Copy result back into x/y
      for(i=0; i<ncols; ++i) {
        a = buffer[xs_ptr+i]
        b = buffer[ys_ptr+i]
        c = buffer[cos_ptr+i]
        d = -buffer[sin_ptr+i]
        k1 = c * (a + b)
        k2 = a * (d - c)
        k3 = b * (c + d)
        buffer[x_ptr+i] = w * (k1 - k3)
        buffer[y_ptr+i] = w * (k1 + k2)
      }
      
      x_ptr += ncols
      y_ptr += ncols
    }
  }
  
  },{"bit-twiddle":2}],16:[function(require,module,exports){
  "use strict"
  
  module.exports = matrixProduct
  
  var generatePlan = require("./lib/planner.js")
  
  function shape(arr) {
    if(Array.isArray(arr)) {
      return [ arr.length, arr[0].length ]
    } else {
      return arr.shape
    }
  }
  
  function checkShapes(out, a, b) {
    var os = shape(out)
    var as = shape(a)
    var bs = shape(b)
    if(os[0] !== as[0] || os[1] !== bs[1] || as[1] !== bs[0]) {
      throw new Error("Mismatched array shapes for matrix product")
    }
  }
  
  function classifyType(m) {
    if(Array.isArray(m)) {
      if(Array.isArray(m)) {
        return [ "r", "native" ]
      }
    } else if(m.shape && (m.shape.length === 2)) {
      if(m.order[0]) {
        return [ "r", m.dtype ]
      } else {
        return [ "c", m.dtype ]
      }
    }
    throw new Error("Unrecognized data type")
  }
  
  var CACHE = {}
  
  function matrixProduct(out, a, b, alpha, beta) {
    if(alpha === undefined) {
      alpha = 1.0
    }
    if(beta === undefined) {
      beta = 0.0
    }
    var useAlpha = (alpha !== 1.0)
    var useBeta  = (beta !== 0.0)
    var outType  = classifyType(out)
    var aType    = classifyType(a)
    var bType    = classifyType(b)
  
    checkShapes(out, a, b)
  
    var typeSig  = [ outType, aType, bType, useAlpha, useBeta ].join(":")
    var proc     = CACHE[typeSig]
    if(!proc) {
      proc = CACHE[typeSig] = generatePlan(outType, aType, bType, useAlpha, useBeta)
    }
    return proc(out, a, b, alpha, beta)
  }
  },{"./lib/planner.js":17}],17:[function(require,module,exports){
  "use strict"
  
  module.exports = generateMatrixProduct
  
  var BLOCK_SIZE = 32
  
  function unpackOrder(order) {
    return order === "r" ? [1,0] : [0,1]
  }
  
  function unpackShape(name, type) {
    if(type[1] === "native") {
      return [
        name, "d0=", name, ".length,",
        name, "d1=", name, "[0].length,"
      ].join("")
    } else {
      return [
        name, "d0=", name, ".shape[0],",
        name, "d1=", name, ".shape[1],",
        name, "s0=", name, ".stride[0],",
        name, "s1=", name, ".stride[1],",
        name, "o=", name, ".offset,",
        name, "d=", name, ".data,"
      ].join("")
    }
  }
  
  function start(order, name, type, i, j, w) {
    var code = []
    if(type[1] === "native") {
      if(order[0]) {
        if(i) {
          code.push("var ", name, "p=", name, "[", i, "];")
        } else {
          code.push("var ", name, "p=", name, "[0];")
        }
      }
    } else {
      if(i && j) {
        if(w) {
          code.push(
            "var ", name, "t0=", name, "s", order[0], ",",
                    name, "t1=", name, "s", order[1], "-", name, "s", order[0], "*", w, ",",
                    name, "p=", name, "o+", i, "*", name, "s0+", j, "*", name, "s1;")
        } else {
          code.push(
            "var ", name, "t0=", name, "s", order[0], ",",
                    name, "p=", name, "o+", i, "*", name, "s0+", j, "*", name, "s1;")
        }
      } else if(i) {
        code.push(
          "var ", name, "t0=", name, "s", order[0], ",",
                  name, "p=", name, "o+", i, "*", name, "s0;")
      } else if(j) {
        code.push(
          "var ", name, "t0=", name, "s", order[0], ",",
                  name, "p=", name, "o+", j, "*", name, "s1;")
      } else  {
        code.push(
          "var ", name, "t0=", name, "s", order[0], ",",
                  name, "t1=", name, "s", order[1], "-", name, "s", order[0], "*", name, "d", order[0], ",",
                  name, "p=", name, "o;")
      }
    }
    return code
  }
  
  function walk(order, name, type, d, i) {
    var code = []
    if(type[1] === "native") {
      if(order[0] && d === 1) {
        code.push(name, "p=", name, "[", i, "+1]")
      }
    } else {
      code.push(name, "p+=", name, "t", d, ";")
    }
    return code
  }
  
  function write(order, name, type, i, j, w) {
    var code = []
    if(type[1] === "native") {
      if(order[0]) {
        code.push(name, "p[", j, "]=", w, ";")
      } else {
        code.push(name, "[", i, "][", j, "]=", w, ";")
      }
    } else if(type[1] === "generic") {
      code.push(name, "d.set(", name, "p,", w, ");")
    } else {
      code.push(name, "d[", name, "p]=", w, ";")
    }
    return code
  }
  
  function read(order, name, type, i, j) {
    var code = []
    if(type[1] === "native") {
      if(order[0]) {
        code.push(name, "p[", j, "]")
      } else {
        code.push(name, "[", i, "][", j, "]")
      }
    } else if(type[1] === "generic") {
      code.push(name, "d.get(", name, "p)")
    } else {
      code.push(name, "d[", name, "p]")
    }
    return code.join("")
  }
  
  function generateRowColumnLoop(oType, aType, bType, useAlpha, useBeta) {
    var code = []
    var oOrd = oType[0] === "r" ? [1,0] : [0,1], aOrd = [1, 0], bOrd = [0, 1]
    var symbols = ["i", "j"]
  
    code.push.apply(code, start(oOrd, "o", oType))
    
    if(oOrd[1]) {
      code.push("for(j=0;j<od1;++j){")
      code.push("for(i=0;i<od0;++i){")
    } else {
      code.push("for(i=0;i<od0;++i){")
      code.push("for(j=0;j<od1;++j){")
    }
  
    code.push.apply(code, start(aOrd, "a", aType, "i"))
    code.push.apply(code, start(bOrd, "b", bType, undefined, "j"))
  
    code.push(
        "var r=0.0;",
        "for(k=0;k<ad1;++k){",
        "r+=", 
          read(aOrd, "a", aType, "i", "k"), "*", 
          read(bOrd, "b", bType, "k", "j"), ";")
  
    //Terminate k loop
    code.push.apply(code, walk(aOrd, "a", aType, 0, "k"))
    code.push.apply(code, walk(bOrd, "b", bType, 0, "k"))
    code.push("}")
  
    //Write r to output
    if(useAlpha) {
      code.push("r*=A;")
    }
    if(useBeta) {
      code.push("r+=B*", read(oOrd, "o", oType, "i", "j"), ";")
    }
    code.push.apply(code, write(oOrd, "o", oType, "i", "j", "r"))
    
    //Terminate j loop loop
    code.push.apply(code, walk(oOrd, "o", oType, 0, symbols[1]))
    code.push("}")
  
    //Terminate i loop
    code.push.apply(code, walk(oOrd, "o", oType, 1, symbols[0]))
    code.push("}")
  
    return code
  }
  
  function generateBetaPass(oType, useBeta) {
    var code = []
    var oOrd = oType[0] === "r" ? [1,0] : [0,1], symbols
    if(useBeta) {
      code.push("if(B!==1.0){")
    }
    code.push.apply(code, start(oOrd, "o", oType))
    if(oOrd[0]) {
      code.push("for(i=0;i<od0;++i){for(j=0;j<od1;++j){")
      symbols = ["i", "j"]
    } else {
      code.push("for(j=0;j<od1;++j){for(i=0;i<od0;++i){")
      symbols = ["j", "i"]
    }
    if(useBeta) {
      code.push.apply(code, write(oOrd, "o", oType, "i", "j", 
        "B*"+read(oOrd, "o", oType, "i", "j")))
    } else {
      code.push.apply(code, write(oOrd, "o", oType, "i", "j", "0"))
    }
    code.push.apply(code, walk(oOrd, "o", oType, 0, symbols[1]))
    code.push("}")
    code.push.apply(code, walk(oOrd, "o", oType, 1, symbols[0]))
    code.push("}")
    if(useBeta) {
      code.push("}")
    }
    return code
  }
  
  function generateBlockLoop(oType, aType, bType, useAlpha, useBeta) {
    var code = []
    var shapes = [ "od0", "od1", "ad1" ]
    var oOrd = [1, 0]
    var aOrd = [1, 0]
    var bOrd = [0, 1]
  
    //Do pass over output to zero it out
    code.push.apply(code, generateBetaPass(oType, useBeta))
  
    for(var i=0; i<3; ++i) {
      code.push(
        "for(var i", i, "=", shapes[i], ";i", i, ">0;){",
          "var w", i, "=", BLOCK_SIZE, ";",
          "if(i", i, "<", BLOCK_SIZE, "){",
            "w", i, "=i", i, ";",
            "i", i, "=0;",
          "}else{",
            "i", i, "-=", BLOCK_SIZE, ";",
          "}")
    }
  
    code.push.apply(code, start(oOrd, "o", oType, "i0", "i1", "w1"))
    
    code.push("for(i=0;i<w0;++i){\
  for(j=0;j<w1;++j){\
  var r=0.0;")
  
    code.push.apply(code, start(aOrd, "a", aType, "(i0+i)", "i2"))
    code.push.apply(code, start(bOrd, "b", bType, "i2", "(i1+j)"))
  
    code.push("for(k=0;k<w2;++k){")
  
    code.push("r+=",
      read(aOrd, "a", aType, "(i0+i)", "(i2+k)"), "*", 
      read(bOrd, "b", bType, "(i2+k)", "(i1+j)"), ";")
  
    //Close off k-loop
    code.push.apply(code, walk(aOrd, "a", aType, 0, "(i2+k)"))
    code.push.apply(code, walk(bOrd, "b", bType, 0, "(i2+k)"))
    code.push("}")
  
    //Write r back to output array
    var sym = "r"
    if(useAlpha) {
      sym = "A*r"
    }
    code.push.apply(code, write(oOrd, "o", oType, "(i0+i)", "(i1+j)", 
      sym + "+" + read(oOrd, "o", oType, "(i0+i)", "(i1+j)")))
  
    //Close off j-loop
    code.push.apply(code, walk(oOrd, "o", oType, 0, "(i1+j)"))
    code.push("}")
  
    //Close off i-loop
    code.push.apply(code, walk(oOrd, "o", oType, 1, "(i0+i)"))
    code.push("}}}}")
  
    return code
  }
  
  function generateMatrixProduct(outType, aType, bType, useAlpha, useBeta) {
    var funcName = ["gemm", outType[0], outType[1], 
                       "a", aType[0], aType[1],
                       "b", bType[0], bType[1],
                       useAlpha ? "alpha" : "",
                       useBeta ? "beta" : "" ].join("")
    var code = [
      "function ", funcName, "(o,a,b,A,B){",
      "var ", unpackShape("o", outType), 
              unpackShape("a", aType),
              unpackShape("b", bType),
              "i,j,k;"
    ]
  
    if(aType[0] === "r" && bType[0] === "c") {
      code.push.apply(code, generateRowColumnLoop(outType, aType, bType, useAlpha, useBeta))
    } else {
      code.push.apply(code, generateBlockLoop(outType, aType, bType, useAlpha, useBeta))
    }
  
    code.push("}return ", funcName)
  
    //Compile function
    var proc = new Function(code.join(""))
    return proc()
  }
  },{}],18:[function(require,module,exports){
  "use strict"
  
  var compile = require("cwise-compiler")
  
  var EmptyProc = {
    body: "",
    args: [],
    thisVars: [],
    localVars: []
  }
  
  function fixup(x) {
    if(!x) {
      return EmptyProc
    }
    for(var i=0; i<x.args.length; ++i) {
      var a = x.args[i]
      if(i === 0) {
        x.args[i] = {name: a, lvalue:true, rvalue: !!x.rvalue, count:x.count||1 }
      } else {
        x.args[i] = {name: a, lvalue:false, rvalue:true, count: 1}
      }
    }
    if(!x.thisVars) {
      x.thisVars = []
    }
    if(!x.localVars) {
      x.localVars = []
    }
    return x
  }
  
  function pcompile(user_args) {
    return compile({
      args:     user_args.args,
      pre:      fixup(user_args.pre),
      body:     fixup(user_args.body),
      post:     fixup(user_args.proc),
      funcName: user_args.funcName
    })
  }
  
  function makeOp(user_args) {
    var args = []
    for(var i=0; i<user_args.args.length; ++i) {
      args.push("a"+i)
    }
    var wrapper = new Function("P", [
      "return function ", user_args.funcName, "_ndarrayops(", args.join(","), ") {P(", args.join(","), ");return a0}"
    ].join(""))
    return wrapper(pcompile(user_args))
  }
  
  var assign_ops = {
    add:  "+",
    sub:  "-",
    mul:  "*",
    div:  "/",
    mod:  "%",
    band: "&",
    bor:  "|",
    bxor: "^",
    lshift: "<<",
    rshift: ">>",
    rrshift: ">>>"
  }
  ;(function(){
    for(var id in assign_ops) {
      var op = assign_ops[id]
      exports[id] = makeOp({
        args: ["array","array","array"],
        body: {args:["a","b","c"],
               body: "a=b"+op+"c"},
        funcName: id
      })
      exports[id+"eq"] = makeOp({
        args: ["array","array"],
        body: {args:["a","b"],
               body:"a"+op+"=b"},
        rvalue: true,
        funcName: id+"eq"
      })
      exports[id+"s"] = makeOp({
        args: ["array", "array", "scalar"],
        body: {args:["a","b","s"],
               body:"a=b"+op+"s"},
        funcName: id+"s"
      })
      exports[id+"seq"] = makeOp({
        args: ["array","scalar"],
        body: {args:["a","s"],
               body:"a"+op+"=s"},
        rvalue: true,
        funcName: id+"seq"
      })
    }
  })();
  
  var unary_ops = {
    not: "!",
    bnot: "~",
    neg: "-",
    recip: "1.0/"
  }
  ;(function(){
    for(var id in unary_ops) {
      var op = unary_ops[id]
      exports[id] = makeOp({
        args: ["array", "array"],
        body: {args:["a","b"],
               body:"a="+op+"b"},
        funcName: id
      })
      exports[id+"eq"] = makeOp({
        args: ["array"],
        body: {args:["a"],
               body:"a="+op+"a"},
        rvalue: true,
        count: 2,
        funcName: id+"eq"
      })
    }
  })();
  
  var binary_ops = {
    and: "&&",
    or: "||",
    eq: "===",
    neq: "!==",
    lt: "<",
    gt: ">",
    leq: "<=",
    geq: ">="
  }
  ;(function() {
    for(var id in binary_ops) {
      var op = binary_ops[id]
      exports[id] = makeOp({
        args: ["array","array","array"],
        body: {args:["a", "b", "c"],
               body:"a=b"+op+"c"},
        funcName: id
      })
      exports[id+"s"] = makeOp({
        args: ["array","array","scalar"],
        body: {args:["a", "b", "s"],
               body:"a=b"+op+"s"},
        funcName: id+"s"
      })
      exports[id+"eq"] = makeOp({
        args: ["array", "array"],
        body: {args:["a", "b"],
               body:"a=a"+op+"b"},
        rvalue:true,
        count:2,
        funcName: id+"eq"
      })
      exports[id+"seq"] = makeOp({
        args: ["array", "scalar"],
        body: {args:["a","s"],
               body:"a=a"+op+"s"},
        rvalue:true,
        count:2,
        funcName: id+"seq"
      })
    }
  })();
  
  var math_unary = [
    "abs",
    "acos",
    "asin",
    "atan",
    "ceil",
    "cos",
    "exp",
    "floor",
    "log",
    "round",
    "sin",
    "sqrt",
    "tan"
  ]
  ;(function() {
    for(var i=0; i<math_unary.length; ++i) {
      var f = math_unary[i]
      exports[f] = makeOp({
                      args: ["array", "array"],
                      pre: {args:[], body:"this_f=Math."+f, thisVars:["this_f"]},
                      body: {args:["a","b"], body:"a=this_f(b)", thisVars:["this_f"]},
                      funcName: f
                    })
      exports[f+"eq"] = makeOp({
                        args: ["array"],
                        pre: {args:[], body:"this_f=Math."+f, thisVars:["this_f"]},
                        body: {args: ["a"], body:"a=this_f(a)", thisVars:["this_f"]},
                        rvalue: true,
                        count: 2,
                        funcName: f+"eq"
                      })
    }
  })();
  
  var math_comm = [
    "max",
    "min",
    "atan2",
    "pow"
  ]
  ;(function(){
    for(var i=0; i<math_comm.length; ++i) {
      var f= math_comm[i]
      exports[f] = makeOp({
                    args:["array", "array", "array"],
                    pre: {args:[], body:"this_f=Math."+f, thisVars:["this_f"]},
                    body: {args:["a","b","c"], body:"a=this_f(b,c)", thisVars:["this_f"]},
                    funcName: f
                  })
      exports[f+"s"] = makeOp({
                    args:["array", "array", "scalar"],
                    pre: {args:[], body:"this_f=Math."+f, thisVars:["this_f"]},
                    body: {args:["a","b","c"], body:"a=this_f(b,c)", thisVars:["this_f"]},
                    funcName: f+"s"
                    })
      exports[f+"eq"] = makeOp({ args:["array", "array"],
                    pre: {args:[], body:"this_f=Math."+f, thisVars:["this_f"]},
                    body: {args:["a","b"], body:"a=this_f(a,b)", thisVars:["this_f"]},
                    rvalue: true,
                    count: 2,
                    funcName: f+"eq"
                    })
      exports[f+"seq"] = makeOp({ args:["array", "scalar"],
                    pre: {args:[], body:"this_f=Math."+f, thisVars:["this_f"]},
                    body: {args:["a","b"], body:"a=this_f(a,b)", thisVars:["this_f"]},
                    rvalue:true,
                    count:2,
                    funcName: f+"seq"
                    })
    }
  })();
  
  var math_noncomm = [
    "atan2",
    "pow"
  ]
  ;(function(){
    for(var i=0; i<math_noncomm.length; ++i) {
      var f= math_noncomm[i]
      exports[f+"op"] = makeOp({
                    args:["array", "array", "array"],
                    pre: {args:[], body:"this_f=Math."+f, thisVars:["this_f"]},
                    body: {args:["a","b","c"], body:"a=this_f(c,b)", thisVars:["this_f"]},
                    funcName: f+"op"
                  })
      exports[f+"ops"] = makeOp({
                    args:["array", "array", "scalar"],
                    pre: {args:[], body:"this_f=Math."+f, thisVars:["this_f"]},
                    body: {args:["a","b","c"], body:"a=this_f(c,b)", thisVars:["this_f"]},
                    funcName: f+"ops"
                    })
      exports[f+"opeq"] = makeOp({ args:["array", "array"],
                    pre: {args:[], body:"this_f=Math."+f, thisVars:["this_f"]},
                    body: {args:["a","b"], body:"a=this_f(b,a)", thisVars:["this_f"]},
                    rvalue: true,
                    count: 2,
                    funcName: f+"opeq"
                    })
      exports[f+"opseq"] = makeOp({ args:["array", "scalar"],
                    pre: {args:[], body:"this_f=Math."+f, thisVars:["this_f"]},
                    body: {args:["a","b"], body:"a=this_f(b,a)", thisVars:["this_f"]},
                    rvalue:true,
                    count:2,
                    funcName: f+"opseq"
                    })
    }
  })();
  
  exports.any = compile({
    args:["array"],
    pre: EmptyProc,
    body: {args:[{name:"a", lvalue:false, rvalue:true, count:1}], body: "if(a){return true}", localVars: [], thisVars: []},
    post: {args:[], localVars:[], thisVars:[], body:"return false"},
    funcName: "any"
  })
  
  exports.all = compile({
    args:["array"],
    pre: EmptyProc,
    body: {args:[{name:"x", lvalue:false, rvalue:true, count:1}], body: "if(!x){return false}", localVars: [], thisVars: []},
    post: {args:[], localVars:[], thisVars:[], body:"return true"},
    funcName: "all"
  })
  
  exports.sum = compile({
    args:["array"],
    pre: {args:[], localVars:[], thisVars:["this_s"], body:"this_s=0"},
    body: {args:[{name:"a", lvalue:false, rvalue:true, count:1}], body: "this_s+=a", localVars: [], thisVars: ["this_s"]},
    post: {args:[], localVars:[], thisVars:["this_s"], body:"return this_s"},
    funcName: "sum"
  })
  
  exports.prod = compile({
    args:["array"],
    pre: {args:[], localVars:[], thisVars:["this_s"], body:"this_s=1"},
    body: {args:[{name:"a", lvalue:false, rvalue:true, count:1}], body: "this_s*=a", localVars: [], thisVars: ["this_s"]},
    post: {args:[], localVars:[], thisVars:["this_s"], body:"return this_s"},
    funcName: "prod"
  })
  
  exports.norm2squared = compile({
    args:["array"],
    pre: {args:[], localVars:[], thisVars:["this_s"], body:"this_s=0"},
    body: {args:[{name:"a", lvalue:false, rvalue:true, count:2}], body: "this_s+=a*a", localVars: [], thisVars: ["this_s"]},
    post: {args:[], localVars:[], thisVars:["this_s"], body:"return this_s"},
    funcName: "norm2squared"
  })
    
  exports.norm2 = compile({
    args:["array"],
    pre: {args:[], localVars:[], thisVars:["this_s"], body:"this_s=0"},
    body: {args:[{name:"a", lvalue:false, rvalue:true, count:2}], body: "this_s+=a*a", localVars: [], thisVars: ["this_s"]},
    post: {args:[], localVars:[], thisVars:["this_s"], body:"return Math.sqrt(this_s)"},
    funcName: "norm2"
  })
    
  
  exports.norminf = compile({
    args:["array"],
    pre: {args:[], localVars:[], thisVars:["this_s"], body:"this_s=0"},
    body: {args:[{name:"a", lvalue:false, rvalue:true, count:4}], body:"if(-a>this_s){this_s=-a}else if(a>this_s){this_s=a}", localVars: [], thisVars: ["this_s"]},
    post: {args:[], localVars:[], thisVars:["this_s"], body:"return this_s"},
    funcName: "norminf"
  })
  
  exports.norm1 = compile({
    args:["array"],
    pre: {args:[], localVars:[], thisVars:["this_s"], body:"this_s=0"},
    body: {args:[{name:"a", lvalue:false, rvalue:true, count:3}], body: "this_s+=a<0?-a:a", localVars: [], thisVars: ["this_s"]},
    post: {args:[], localVars:[], thisVars:["this_s"], body:"return this_s"},
    funcName: "norm1"
  })
  
  exports.sup = compile({
    args: [ "array" ],
    pre:
     { body: "this_h=-Infinity",
       args: [],
       thisVars: [ "this_h" ],
       localVars: [] },
    body:
     { body: "if(_inline_1_arg0_>this_h)this_h=_inline_1_arg0_",
       args: [{"name":"_inline_1_arg0_","lvalue":false,"rvalue":true,"count":2} ],
       thisVars: [ "this_h" ],
       localVars: [] },
    post:
     { body: "return this_h",
       args: [],
       thisVars: [ "this_h" ],
       localVars: [] }
   })
  
  exports.inf = compile({
    args: [ "array" ],
    pre:
     { body: "this_h=Infinity",
       args: [],
       thisVars: [ "this_h" ],
       localVars: [] },
    body:
     { body: "if(_inline_1_arg0_<this_h)this_h=_inline_1_arg0_",
       args: [{"name":"_inline_1_arg0_","lvalue":false,"rvalue":true,"count":2} ],
       thisVars: [ "this_h" ],
       localVars: [] },
    post:
     { body: "return this_h",
       args: [],
       thisVars: [ "this_h" ],
       localVars: [] }
   })
  
  exports.argmin = compile({
    args:["index","array","shape"],
    pre:{
      body:"{this_v=Infinity;this_i=_inline_0_arg2_.slice(0)}",
      args:[
        {name:"_inline_0_arg0_",lvalue:false,rvalue:false,count:0},
        {name:"_inline_0_arg1_",lvalue:false,rvalue:false,count:0},
        {name:"_inline_0_arg2_",lvalue:false,rvalue:true,count:1}
        ],
      thisVars:["this_i","this_v"],
      localVars:[]},
    body:{
      body:"{if(_inline_1_arg1_<this_v){this_v=_inline_1_arg1_;for(var _inline_1_k=0;_inline_1_k<_inline_1_arg0_.length;++_inline_1_k){this_i[_inline_1_k]=_inline_1_arg0_[_inline_1_k]}}}",
      args:[
        {name:"_inline_1_arg0_",lvalue:false,rvalue:true,count:2},
        {name:"_inline_1_arg1_",lvalue:false,rvalue:true,count:2}],
      thisVars:["this_i","this_v"],
      localVars:["_inline_1_k"]},
    post:{
      body:"{return this_i}",
      args:[],
      thisVars:["this_i"],
      localVars:[]}
  })
  
  exports.argmax = compile({
    args:["index","array","shape"],
    pre:{
      body:"{this_v=-Infinity;this_i=_inline_0_arg2_.slice(0)}",
      args:[
        {name:"_inline_0_arg0_",lvalue:false,rvalue:false,count:0},
        {name:"_inline_0_arg1_",lvalue:false,rvalue:false,count:0},
        {name:"_inline_0_arg2_",lvalue:false,rvalue:true,count:1}
        ],
      thisVars:["this_i","this_v"],
      localVars:[]},
    body:{
      body:"{if(_inline_1_arg1_>this_v){this_v=_inline_1_arg1_;for(var _inline_1_k=0;_inline_1_k<_inline_1_arg0_.length;++_inline_1_k){this_i[_inline_1_k]=_inline_1_arg0_[_inline_1_k]}}}",
      args:[
        {name:"_inline_1_arg0_",lvalue:false,rvalue:true,count:2},
        {name:"_inline_1_arg1_",lvalue:false,rvalue:true,count:2}],
      thisVars:["this_i","this_v"],
      localVars:["_inline_1_k"]},
    post:{
      body:"{return this_i}",
      args:[],
      thisVars:["this_i"],
      localVars:[]}
  })  
  
  exports.random = makeOp({
    args: ["array"],
    pre: {args:[], body:"this_f=Math.random", thisVars:["this_f"]},
    body: {args: ["a"], body:"a=this_f()", thisVars:["this_f"]},
    funcName: "random"
  })
  
  exports.assign = makeOp({
    args:["array", "array"],
    body: {args:["a", "b"], body:"a=b"},
    funcName: "assign" })
  
  exports.assigns = makeOp({
    args:["array", "scalar"],
    body: {args:["a", "b"], body:"a=b"},
    funcName: "assigns" })
  
  
  exports.equals = compile({
    args:["array", "array"],
    pre: EmptyProc,
    body: {args:[{name:"x", lvalue:false, rvalue:true, count:1},
                 {name:"y", lvalue:false, rvalue:true, count:1}], 
          body: "if(x!==y){return false}", 
          localVars: [], 
          thisVars: []},
    post: {args:[], localVars:[], thisVars:[], body:"return true"},
    funcName: "equals"
  })
  
  
  
  },{"cwise-compiler":5}],19:[function(require,module,exports){
  var iota = require("iota-array")
  var isBuffer = require("is-buffer")
  
  var hasTypedArrays  = ((typeof Float64Array) !== "undefined")
  
  function compare1st(a, b) {
    return a[0] - b[0]
  }
  
  function order() {
    var stride = this.stride
    var terms = new Array(stride.length)
    var i
    for(i=0; i<terms.length; ++i) {
      terms[i] = [Math.abs(stride[i]), i]
    }
    terms.sort(compare1st)
    var result = new Array(terms.length)
    for(i=0; i<result.length; ++i) {
      result[i] = terms[i][1]
    }
    return result
  }
  
  function compileConstructor(dtype, dimension) {
    var className = ["View", dimension, "d", dtype].join("")
    if(dimension < 0) {
      className = "View_Nil" + dtype
    }
    var useGetters = (dtype === "generic")
  
    if(dimension === -1) {
      //Special case for trivial arrays
      var code =
        "function "+className+"(a){this.data=a;};\
  var proto="+className+".prototype;\
  proto.dtype='"+dtype+"';\
  proto.index=function(){return -1};\
  proto.size=0;\
  proto.dimension=-1;\
  proto.shape=proto.stride=proto.order=[];\
  proto.lo=proto.hi=proto.transpose=proto.step=\
  function(){return new "+className+"(this.data);};\
  proto.get=proto.set=function(){};\
  proto.pick=function(){return null};\
  return function construct_"+className+"(a){return new "+className+"(a);}"
      var procedure = new Function(code)
      return procedure()
    } else if(dimension === 0) {
      //Special case for 0d arrays
      var code =
        "function "+className+"(a,d) {\
  this.data = a;\
  this.offset = d\
  };\
  var proto="+className+".prototype;\
  proto.dtype='"+dtype+"';\
  proto.index=function(){return this.offset};\
  proto.dimension=0;\
  proto.size=1;\
  proto.shape=\
  proto.stride=\
  proto.order=[];\
  proto.lo=\
  proto.hi=\
  proto.transpose=\
  proto.step=function "+className+"_copy() {\
  return new "+className+"(this.data,this.offset)\
  };\
  proto.pick=function "+className+"_pick(){\
  return TrivialArray(this.data);\
  };\
  proto.valueOf=proto.get=function "+className+"_get(){\
  return "+(useGetters ? "this.data.get(this.offset)" : "this.data[this.offset]")+
  "};\
  proto.set=function "+className+"_set(v){\
  return "+(useGetters ? "this.data.set(this.offset,v)" : "this.data[this.offset]=v")+"\
  };\
  return function construct_"+className+"(a,b,c,d){return new "+className+"(a,d)}"
      var procedure = new Function("TrivialArray", code)
      return procedure(CACHED_CONSTRUCTORS[dtype][0])
    }
  
    var code = ["'use strict'"]
  
    //Create constructor for view
    var indices = iota(dimension)
    var args = indices.map(function(i) { return "i"+i })
    var index_str = "this.offset+" + indices.map(function(i) {
          return "this.stride[" + i + "]*i" + i
        }).join("+")
    var shapeArg = indices.map(function(i) {
        return "b"+i
      }).join(",")
    var strideArg = indices.map(function(i) {
        return "c"+i
      }).join(",")
    code.push(
      "function "+className+"(a," + shapeArg + "," + strideArg + ",d){this.data=a",
        "this.shape=[" + shapeArg + "]",
        "this.stride=[" + strideArg + "]",
        "this.offset=d|0}",
      "var proto="+className+".prototype",
      "proto.dtype='"+dtype+"'",
      "proto.dimension="+dimension)
  
    //view.size:
    code.push("Object.defineProperty(proto,'size',{get:function "+className+"_size(){\
  return "+indices.map(function(i) { return "this.shape["+i+"]" }).join("*"),
  "}})")
  
    //view.order:
    if(dimension === 1) {
      code.push("proto.order=[0]")
    } else {
      code.push("Object.defineProperty(proto,'order',{get:")
      if(dimension < 4) {
        code.push("function "+className+"_order(){")
        if(dimension === 2) {
          code.push("return (Math.abs(this.stride[0])>Math.abs(this.stride[1]))?[1,0]:[0,1]}})")
        } else if(dimension === 3) {
          code.push(
  "var s0=Math.abs(this.stride[0]),s1=Math.abs(this.stride[1]),s2=Math.abs(this.stride[2]);\
  if(s0>s1){\
  if(s1>s2){\
  return [2,1,0];\
  }else if(s0>s2){\
  return [1,2,0];\
  }else{\
  return [1,0,2];\
  }\
  }else if(s0>s2){\
  return [2,0,1];\
  }else if(s2>s1){\
  return [0,1,2];\
  }else{\
  return [0,2,1];\
  }}})")
        }
      } else {
        code.push("ORDER})")
      }
    }
  
    //view.set(i0, ..., v):
    code.push(
  "proto.set=function "+className+"_set("+args.join(",")+",v){")
    if(useGetters) {
      code.push("return this.data.set("+index_str+",v)}")
    } else {
      code.push("return this.data["+index_str+"]=v}")
    }
  
    //view.get(i0, ...):
    code.push("proto.get=function "+className+"_get("+args.join(",")+"){")
    if(useGetters) {
      code.push("return this.data.get("+index_str+")}")
    } else {
      code.push("return this.data["+index_str+"]}")
    }
  
    //view.index:
    code.push(
      "proto.index=function "+className+"_index(", args.join(), "){return "+index_str+"}")
  
    //view.hi():
    code.push("proto.hi=function "+className+"_hi("+args.join(",")+"){return new "+className+"(this.data,"+
      indices.map(function(i) {
        return ["(typeof i",i,"!=='number'||i",i,"<0)?this.shape[", i, "]:i", i,"|0"].join("")
      }).join(",")+","+
      indices.map(function(i) {
        return "this.stride["+i + "]"
      }).join(",")+",this.offset)}")
  
    //view.lo():
    var a_vars = indices.map(function(i) { return "a"+i+"=this.shape["+i+"]" })
    var c_vars = indices.map(function(i) { return "c"+i+"=this.stride["+i+"]" })
    code.push("proto.lo=function "+className+"_lo("+args.join(",")+"){var b=this.offset,d=0,"+a_vars.join(",")+","+c_vars.join(","))
    for(var i=0; i<dimension; ++i) {
      code.push(
  "if(typeof i"+i+"==='number'&&i"+i+">=0){\
  d=i"+i+"|0;\
  b+=c"+i+"*d;\
  a"+i+"-=d}")
    }
    code.push("return new "+className+"(this.data,"+
      indices.map(function(i) {
        return "a"+i
      }).join(",")+","+
      indices.map(function(i) {
        return "c"+i
      }).join(",")+",b)}")
  
    //view.step():
    code.push("proto.step=function "+className+"_step("+args.join(",")+"){var "+
      indices.map(function(i) {
        return "a"+i+"=this.shape["+i+"]"
      }).join(",")+","+
      indices.map(function(i) {
        return "b"+i+"=this.stride["+i+"]"
      }).join(",")+",c=this.offset,d=0,ceil=Math.ceil")
    for(var i=0; i<dimension; ++i) {
      code.push(
  "if(typeof i"+i+"==='number'){\
  d=i"+i+"|0;\
  if(d<0){\
  c+=b"+i+"*(a"+i+"-1);\
  a"+i+"=ceil(-a"+i+"/d)\
  }else{\
  a"+i+"=ceil(a"+i+"/d)\
  }\
  b"+i+"*=d\
  }")
    }
    code.push("return new "+className+"(this.data,"+
      indices.map(function(i) {
        return "a" + i
      }).join(",")+","+
      indices.map(function(i) {
        return "b" + i
      }).join(",")+",c)}")
  
    //view.transpose():
    var tShape = new Array(dimension)
    var tStride = new Array(dimension)
    for(var i=0; i<dimension; ++i) {
      tShape[i] = "a[i"+i+"]"
      tStride[i] = "b[i"+i+"]"
    }
    code.push("proto.transpose=function "+className+"_transpose("+args+"){"+
      args.map(function(n,idx) { return n + "=(" + n + "===undefined?" + idx + ":" + n + "|0)"}).join(";"),
      "var a=this.shape,b=this.stride;return new "+className+"(this.data,"+tShape.join(",")+","+tStride.join(",")+",this.offset)}")
  
    //view.pick():
    code.push("proto.pick=function "+className+"_pick("+args+"){var a=[],b=[],c=this.offset")
    for(var i=0; i<dimension; ++i) {
      code.push("if(typeof i"+i+"==='number'&&i"+i+">=0){c=(c+this.stride["+i+"]*i"+i+")|0}else{a.push(this.shape["+i+"]);b.push(this.stride["+i+"])}")
    }
    code.push("var ctor=CTOR_LIST[a.length+1];return ctor(this.data,a,b,c)}")
  
    //Add return statement
    code.push("return function construct_"+className+"(data,shape,stride,offset){return new "+className+"(data,"+
      indices.map(function(i) {
        return "shape["+i+"]"
      }).join(",")+","+
      indices.map(function(i) {
        return "stride["+i+"]"
      }).join(",")+",offset)}")
  
    //Compile procedure
    var procedure = new Function("CTOR_LIST", "ORDER", code.join("\n"))
    return procedure(CACHED_CONSTRUCTORS[dtype], order)
  }
  
  function arrayDType(data) {
    if(isBuffer(data)) {
      return "buffer"
    }
    if(hasTypedArrays) {
      switch(Object.prototype.toString.call(data)) {
        case "[object Float64Array]":
          return "float64"
        case "[object Float32Array]":
          return "float32"
        case "[object Int8Array]":
          return "int8"
        case "[object Int16Array]":
          return "int16"
        case "[object Int32Array]":
          return "int32"
        case "[object Uint8Array]":
          return "uint8"
        case "[object Uint16Array]":
          return "uint16"
        case "[object Uint32Array]":
          return "uint32"
        case "[object Uint8ClampedArray]":
          return "uint8_clamped"
      }
    }
    if(Array.isArray(data)) {
      return "array"
    }
    return "generic"
  }
  
  var CACHED_CONSTRUCTORS = {
    "float32":[],
    "float64":[],
    "int8":[],
    "int16":[],
    "int32":[],
    "uint8":[],
    "uint16":[],
    "uint32":[],
    "array":[],
    "uint8_clamped":[],
    "buffer":[],
    "generic":[]
  }
  
  ;(function() {
    for(var id in CACHED_CONSTRUCTORS) {
      CACHED_CONSTRUCTORS[id].push(compileConstructor(id, -1))
    }
  });
  
  function wrappedNDArrayCtor(data, shape, stride, offset) {
    if(data === undefined) {
      var ctor = CACHED_CONSTRUCTORS.array[0]
      return ctor([])
    } else if(typeof data === "number") {
      data = [data]
    }
    if(shape === undefined) {
      shape = [ data.length ]
    }
    var d = shape.length
    if(stride === undefined) {
      stride = new Array(d)
      for(var i=d-1, sz=1; i>=0; --i) {
        stride[i] = sz
        sz *= shape[i]
      }
    }
    if(offset === undefined) {
      offset = 0
      for(var i=0; i<d; ++i) {
        if(stride[i] < 0) {
          offset -= (shape[i]-1)*stride[i]
        }
      }
    }
    var dtype = arrayDType(data)
    var ctor_list = CACHED_CONSTRUCTORS[dtype]
    while(ctor_list.length <= d+1) {
      ctor_list.push(compileConstructor(dtype, ctor_list.length-1))
    }
    var ctor = ctor_list[d+1]
    return ctor(data, shape, stride, offset)
  }
  
  module.exports = wrappedNDArrayCtor
  
  },{"iota-array":11,"is-buffer":12}],20:[function(require,module,exports){
  (function (process){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  // resolves . and .. elements in a path array with directory names there
  // must be no slashes, empty elements, or device names (c:\) in the array
  // (so also no leading and trailing slashes - it does not distinguish
  // relative and absolute paths)
  function normalizeArray(parts, allowAboveRoot) {
    // if the path tries to go above the root, `up` ends up > 0
    var up = 0;
    for (var i = parts.length - 1; i >= 0; i--) {
      var last = parts[i];
      if (last === '.') {
        parts.splice(i, 1);
      } else if (last === '..') {
        parts.splice(i, 1);
        up++;
      } else if (up) {
        parts.splice(i, 1);
        up--;
      }
    }
  
    // if the path is allowed to go above the root, restore leading ..s
    if (allowAboveRoot) {
      for (; up--; up) {
        parts.unshift('..');
      }
    }
  
    return parts;
  }
  
  // Split a filename into [root, dir, basename, ext], unix version
  // 'root' is just a slash, or nothing.
  var splitPathRe =
      /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
  var splitPath = function(filename) {
    return splitPathRe.exec(filename).slice(1);
  };
  
  // path.resolve([from ...], to)
  // posix version
  exports.resolve = function() {
    var resolvedPath = '',
        resolvedAbsolute = false;
  
    for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
      var path = (i >= 0) ? arguments[i] : process.cwd();
  
      // Skip empty and invalid entries
      if (typeof path !== 'string') {
        throw new TypeError('Arguments to path.resolve must be strings');
      } else if (!path) {
        continue;
      }
  
      resolvedPath = path + '/' + resolvedPath;
      resolvedAbsolute = path.charAt(0) === '/';
    }
  
    // At this point the path should be resolved to a full absolute path, but
    // handle relative paths to be safe (might happen when process.cwd() fails)
  
    // Normalize the path
    resolvedPath = normalizeArray(filter(resolvedPath.split('/'), function(p) {
      return !!p;
    }), !resolvedAbsolute).join('/');
  
    return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
  };
  
  // path.normalize(path)
  // posix version
  exports.normalize = function(path) {
    var isAbsolute = exports.isAbsolute(path),
        trailingSlash = substr(path, -1) === '/';
  
    // Normalize the path
    path = normalizeArray(filter(path.split('/'), function(p) {
      return !!p;
    }), !isAbsolute).join('/');
  
    if (!path && !isAbsolute) {
      path = '.';
    }
    if (path && trailingSlash) {
      path += '/';
    }
  
    return (isAbsolute ? '/' : '') + path;
  };
  
  // posix version
  exports.isAbsolute = function(path) {
    return path.charAt(0) === '/';
  };
  
  // posix version
  exports.join = function() {
    var paths = Array.prototype.slice.call(arguments, 0);
    return exports.normalize(filter(paths, function(p, index) {
      if (typeof p !== 'string') {
        throw new TypeError('Arguments to path.join must be strings');
      }
      return p;
    }).join('/'));
  };
  
  
  // path.relative(from, to)
  // posix version
  exports.relative = function(from, to) {
    from = exports.resolve(from).substr(1);
    to = exports.resolve(to).substr(1);
  
    function trim(arr) {
      var start = 0;
      for (; start < arr.length; start++) {
        if (arr[start] !== '') break;
      }
  
      var end = arr.length - 1;
      for (; end >= 0; end--) {
        if (arr[end] !== '') break;
      }
  
      if (start > end) return [];
      return arr.slice(start, end - start + 1);
    }
  
    var fromParts = trim(from.split('/'));
    var toParts = trim(to.split('/'));
  
    var length = Math.min(fromParts.length, toParts.length);
    var samePartsLength = length;
    for (var i = 0; i < length; i++) {
      if (fromParts[i] !== toParts[i]) {
        samePartsLength = i;
        break;
      }
    }
  
    var outputParts = [];
    for (var i = samePartsLength; i < fromParts.length; i++) {
      outputParts.push('..');
    }
  
    outputParts = outputParts.concat(toParts.slice(samePartsLength));
  
    return outputParts.join('/');
  };
  
  exports.sep = '/';
  exports.delimiter = ':';
  
  exports.dirname = function(path) {
    var result = splitPath(path),
        root = result[0],
        dir = result[1];
  
    if (!root && !dir) {
      // No dirname whatsoever
      return '.';
    }
  
    if (dir) {
      // It has a dirname, strip trailing slash
      dir = dir.substr(0, dir.length - 1);
    }
  
    return root + dir;
  };
  
  
  exports.basename = function(path, ext) {
    var f = splitPath(path)[2];
    // TODO: make this comparison case-insensitive on windows?
    if (ext && f.substr(-1 * ext.length) === ext) {
      f = f.substr(0, f.length - ext.length);
    }
    return f;
  };
  
  
  exports.extname = function(path) {
    return splitPath(path)[3];
  };
  
  function filter (xs, f) {
      if (xs.filter) return xs.filter(f);
      var res = [];
      for (var i = 0; i < xs.length; i++) {
          if (f(xs[i], i, xs)) res.push(xs[i]);
      }
      return res;
  }
  
  // String.prototype.substr - negative index don't work in IE8
  var substr = 'ab'.substr(-1) === 'b'
      ? function (str, start, len) { return str.substr(start, len) }
      : function (str, start, len) {
          if (start < 0) start = str.length + start;
          return str.substr(start, len);
      }
  ;
  
  }).call(this,require('_process'))
  },{"_process":21}],21:[function(require,module,exports){
  // shim for using process in browser
  var process = module.exports = {};
  
  // cached from whatever global is present so that test runners that stub it
  // don't break things.  But we need to wrap it in a try catch in case it is
  // wrapped in strict mode code which doesn't define any globals.  It's inside a
  // function because try/catches deoptimize in certain engines.
  
  var cachedSetTimeout;
  var cachedClearTimeout;
  
  function defaultSetTimout() {
      throw new Error('setTimeout has not been defined');
  }
  function defaultClearTimeout () {
      throw new Error('clearTimeout has not been defined');
  }
  (function () {
      try {
          if (typeof setTimeout === 'function') {
              cachedSetTimeout = setTimeout;
          } else {
              cachedSetTimeout = defaultSetTimout;
          }
      } catch (e) {
          cachedSetTimeout = defaultSetTimout;
      }
      try {
          if (typeof clearTimeout === 'function') {
              cachedClearTimeout = clearTimeout;
          } else {
              cachedClearTimeout = defaultClearTimeout;
          }
      } catch (e) {
          cachedClearTimeout = defaultClearTimeout;
      }
  } ())
  function runTimeout(fun) {
      if (cachedSetTimeout === setTimeout) {
          //normal enviroments in sane situations
          return setTimeout(fun, 0);
      }
      // if setTimeout wasn't available but was latter defined
      if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
          cachedSetTimeout = setTimeout;
          return setTimeout(fun, 0);
      }
      try {
          // when when somebody has screwed with setTimeout but no I.E. maddness
          return cachedSetTimeout(fun, 0);
      } catch(e){
          try {
              // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
              return cachedSetTimeout.call(null, fun, 0);
          } catch(e){
              // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
              return cachedSetTimeout.call(this, fun, 0);
          }
      }
  
  
  }
  function runClearTimeout(marker) {
      if (cachedClearTimeout === clearTimeout) {
          //normal enviroments in sane situations
          return clearTimeout(marker);
      }
      // if clearTimeout wasn't available but was latter defined
      if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
          cachedClearTimeout = clearTimeout;
          return clearTimeout(marker);
      }
      try {
          // when when somebody has screwed with setTimeout but no I.E. maddness
          return cachedClearTimeout(marker);
      } catch (e){
          try {
              // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
              return cachedClearTimeout.call(null, marker);
          } catch (e){
              // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
              // Some versions of I.E. have different rules for clearTimeout vs setTimeout
              return cachedClearTimeout.call(this, marker);
          }
      }
  
  
  
  }
  var queue = [];
  var draining = false;
  var currentQueue;
  var queueIndex = -1;
  
  function cleanUpNextTick() {
      if (!draining || !currentQueue) {
          return;
      }
      draining = false;
      if (currentQueue.length) {
          queue = currentQueue.concat(queue);
      } else {
          queueIndex = -1;
      }
      if (queue.length) {
          drainQueue();
      }
  }
  
  function drainQueue() {
      if (draining) {
          return;
      }
      var timeout = runTimeout(cleanUpNextTick);
      draining = true;
  
      var len = queue.length;
      while(len) {
          currentQueue = queue;
          queue = [];
          while (++queueIndex < len) {
              if (currentQueue) {
                  currentQueue[queueIndex].run();
              }
          }
          queueIndex = -1;
          len = queue.length;
      }
      currentQueue = null;
      draining = false;
      runClearTimeout(timeout);
  }
  
  process.nextTick = function (fun) {
      var args = new Array(arguments.length - 1);
      if (arguments.length > 1) {
          for (var i = 1; i < arguments.length; i++) {
              args[i - 1] = arguments[i];
          }
      }
      queue.push(new Item(fun, args));
      if (queue.length === 1 && !draining) {
          runTimeout(drainQueue);
      }
  };
  
  // v8 likes predictible objects
  function Item(fun, array) {
      this.fun = fun;
      this.array = array;
  }
  Item.prototype.run = function () {
      this.fun.apply(null, this.array);
  };
  process.title = 'browser';
  process.browser = true;
  process.env = {};
  process.argv = [];
  process.version = ''; // empty string to avoid regexp issues
  process.versions = {};
  
  function noop() {}
  
  process.on = noop;
  process.addListener = noop;
  process.once = noop;
  process.off = noop;
  process.removeListener = noop;
  process.removeAllListeners = noop;
  process.emit = noop;
  
  process.binding = function (name) {
      throw new Error('process.binding is not supported');
  };
  
  process.cwd = function () { return '/' };
  process.chdir = function (dir) {
      throw new Error('process.chdir is not supported');
  };
  process.umask = function() { return 0; };
  
  },{}],22:[function(require,module,exports){
  (function (global,Buffer){
  'use strict'
  
  var bits = require('bit-twiddle')
  var dup = require('dup')
  
  //Legacy pool support
  if(!global.__TYPEDARRAY_POOL) {
    global.__TYPEDARRAY_POOL = {
        UINT8   : dup([32, 0])
      , UINT16  : dup([32, 0])
      , UINT32  : dup([32, 0])
      , INT8    : dup([32, 0])
      , INT16   : dup([32, 0])
      , INT32   : dup([32, 0])
      , FLOAT   : dup([32, 0])
      , DOUBLE  : dup([32, 0])
      , DATA    : dup([32, 0])
      , UINT8C  : dup([32, 0])
      , BUFFER  : dup([32, 0])
    }
  }
  
  var hasUint8C = (typeof Uint8ClampedArray) !== 'undefined'
  var POOL = global.__TYPEDARRAY_POOL
  
  //Upgrade pool
  if(!POOL.UINT8C) {
    POOL.UINT8C = dup([32, 0])
  }
  if(!POOL.BUFFER) {
    POOL.BUFFER = dup([32, 0])
  }
  
  //New technique: Only allocate from ArrayBufferView and Buffer
  var DATA    = POOL.DATA
    , BUFFER  = POOL.BUFFER
  
  exports.free = function free(array) {
    if(Buffer.isBuffer(array)) {
      BUFFER[bits.log2(array.length)].push(array)
    } else {
      if(Object.prototype.toString.call(array) !== '[object ArrayBuffer]') {
        array = array.buffer
      }
      if(!array) {
        return
      }
      var n = array.length || array.byteLength
      var log_n = bits.log2(n)|0
      DATA[log_n].push(array)
    }
  }
  
  function freeArrayBuffer(buffer) {
    if(!buffer) {
      return
    }
    var n = buffer.length || buffer.byteLength
    var log_n = bits.log2(n)
    DATA[log_n].push(buffer)
  }
  
  function freeTypedArray(array) {
    freeArrayBuffer(array.buffer)
  }
  
  exports.freeUint8 =
  exports.freeUint16 =
  exports.freeUint32 =
  exports.freeInt8 =
  exports.freeInt16 =
  exports.freeInt32 =
  exports.freeFloat32 = 
  exports.freeFloat =
  exports.freeFloat64 = 
  exports.freeDouble = 
  exports.freeUint8Clamped = 
  exports.freeDataView = freeTypedArray
  
  exports.freeArrayBuffer = freeArrayBuffer
  
  exports.freeBuffer = function freeBuffer(array) {
    BUFFER[bits.log2(array.length)].push(array)
  }
  
  exports.malloc = function malloc(n, dtype) {
    if(dtype === undefined || dtype === 'arraybuffer') {
      return mallocArrayBuffer(n)
    } else {
      switch(dtype) {
        case 'uint8':
          return mallocUint8(n)
        case 'uint16':
          return mallocUint16(n)
        case 'uint32':
          return mallocUint32(n)
        case 'int8':
          return mallocInt8(n)
        case 'int16':
          return mallocInt16(n)
        case 'int32':
          return mallocInt32(n)
        case 'float':
        case 'float32':
          return mallocFloat(n)
        case 'double':
        case 'float64':
          return mallocDouble(n)
        case 'uint8_clamped':
          return mallocUint8Clamped(n)
        case 'buffer':
          return mallocBuffer(n)
        case 'data':
        case 'dataview':
          return mallocDataView(n)
  
        default:
          return null
      }
    }
    return null
  }
  
  function mallocArrayBuffer(n) {
    var n = bits.nextPow2(n)
    var log_n = bits.log2(n)
    var d = DATA[log_n]
    if(d.length > 0) {
      return d.pop()
    }
    return new ArrayBuffer(n)
  }
  exports.mallocArrayBuffer = mallocArrayBuffer
  
  function mallocUint8(n) {
    return new Uint8Array(mallocArrayBuffer(n), 0, n)
  }
  exports.mallocUint8 = mallocUint8
  
  function mallocUint16(n) {
    return new Uint16Array(mallocArrayBuffer(2*n), 0, n)
  }
  exports.mallocUint16 = mallocUint16
  
  function mallocUint32(n) {
    return new Uint32Array(mallocArrayBuffer(4*n), 0, n)
  }
  exports.mallocUint32 = mallocUint32
  
  function mallocInt8(n) {
    return new Int8Array(mallocArrayBuffer(n), 0, n)
  }
  exports.mallocInt8 = mallocInt8
  
  function mallocInt16(n) {
    return new Int16Array(mallocArrayBuffer(2*n), 0, n)
  }
  exports.mallocInt16 = mallocInt16
  
  function mallocInt32(n) {
    return new Int32Array(mallocArrayBuffer(4*n), 0, n)
  }
  exports.mallocInt32 = mallocInt32
  
  function mallocFloat(n) {
    return new Float32Array(mallocArrayBuffer(4*n), 0, n)
  }
  exports.mallocFloat32 = exports.mallocFloat = mallocFloat
  
  function mallocDouble(n) {
    return new Float64Array(mallocArrayBuffer(8*n), 0, n)
  }
  exports.mallocFloat64 = exports.mallocDouble = mallocDouble
  
  function mallocUint8Clamped(n) {
    if(hasUint8C) {
      return new Uint8ClampedArray(mallocArrayBuffer(n), 0, n)
    } else {
      return mallocUint8(n)
    }
  }
  exports.mallocUint8Clamped = mallocUint8Clamped
  
  function mallocDataView(n) {
    return new DataView(mallocArrayBuffer(n), 0, n)
  }
  exports.mallocDataView = mallocDataView
  
  function mallocBuffer(n) {
    n = bits.nextPow2(n)
    var log_n = bits.log2(n)
    var cache = BUFFER[log_n]
    if(cache.length > 0) {
      return cache.pop()
    }
    return new Buffer(n)
  }
  exports.mallocBuffer = mallocBuffer
  
  exports.clearCache = function clearCache() {
    for(var i=0; i<32; ++i) {
      POOL.UINT8[i].length = 0
      POOL.UINT16[i].length = 0
      POOL.UINT32[i].length = 0
      POOL.INT8[i].length = 0
      POOL.INT16[i].length = 0
      POOL.INT32[i].length = 0
      POOL.FLOAT[i].length = 0
      POOL.DOUBLE[i].length = 0
      POOL.UINT8C[i].length = 0
      DATA[i].length = 0
      BUFFER[i].length = 0
    }
  }
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("buffer").Buffer)
  },{"bit-twiddle":2,"buffer":3,"dup":9}],23:[function(require,module,exports){
  "use strict"
  
  function unique_pred(list, compare) {
    var ptr = 1
      , len = list.length
      , a=list[0], b=list[0]
    for(var i=1; i<len; ++i) {
      b = a
      a = list[i]
      if(compare(a, b)) {
        if(i === ptr) {
          ptr++
          continue
        }
        list[ptr++] = a
      }
    }
    list.length = ptr
    return list
  }
  
  function unique_eq(list) {
    var ptr = 1
      , len = list.length
      , a=list[0], b = list[0]
    for(var i=1; i<len; ++i, b=a) {
      b = a
      a = list[i]
      if(a !== b) {
        if(i === ptr) {
          ptr++
          continue
        }
        list[ptr++] = a
      }
    }
    list.length = ptr
    return list
  }
  
  function unique(list, compare, sorted) {
    if(list.length === 0) {
      return list
    }
    if(compare) {
      if(!sorted) {
        list.sort(compare)
      }
      return unique_pred(list, compare)
    }
    if(!sorted) {
      list.sort()
    }
    return unique_eq(list)
  }
  
  module.exports = unique
  
  },{}],24:[function(require,module,exports){
  'use strict';
  
  module.exports = {
    printThreshold: 7,
    nFloatingValues: 5
  };
  
  },{}],25:[function(require,module,exports){
  'use strict';
  
  module.exports = {
    int8: Int8Array,
    int16: Int16Array,
    int32: Int32Array,
    uint8: Uint8Array,
    uint16: Uint16Array,
    uint32: Uint32Array,
    float32: Float32Array,
    float64: Float64Array,
    array: Array
  };
  
  },{}],26:[function(require,module,exports){
  'use strict';
  
  module.exports = {
    ValueError: function ValueError () {
      var err = Error.apply(this, arguments);
      err.name = this.constructor.name;
      return err;
    },
    ConfigError: function ConfigError () {
      var err = Error.apply(this, arguments);
      err.name = this.constructor.name;
      return err;
    },
    NotImplementedError: function NotImplementedError () {
      var err = Error.apply(this, arguments);
      err.name = this.constructor.name;
      return err;
    }
  };
  
  },{}],27:[function(require,module,exports){
  'use strict';
  
  module.exports = function areaSum (h0, w0, H, W, SAT) {
    var x0 = w0 - 1;
    var x1 = w0 + W - 1;
    var y0 = h0 - 1;
    var y1 = h0 + H - 1;
    return (w0 !== 0 && h0 !== 0) ? SAT.selection.get(y0, x0) - SAT.selection.get(y1, x0) - SAT.selection.get(y0, x1) + SAT.selection.get(y1, x1)
      : (w0 === 0 && h0 === 0) ? SAT.selection.get(h0 + H - 1, w0 + W - 1)
        : (w0 === 0) ? -SAT.selection.get(y0, w0 + W - 1) + SAT.selection.get(h0 + H - 1, w0 + W - 1)
          : -SAT.selection.get(y1, x0) + SAT.selection.get(y1, x1);
  };
  
  },{}],28:[function(require,module,exports){
  'use strict';
  
  var areaSum = require('./area-sum');
  
  module.exports = function areaValue (h0, w0, H, W, SAT) {
    return areaSum(h0, w0, H, W, SAT) / (H * W);
  };
  
  },{"./area-sum":27}],29:[function(require,module,exports){
  (function (__dirname){
  'use strict';
  var path = require('path');
  
  var read = require('./read');
  
  var DATA_DIR = path.join(path.resolve(__dirname), '../../data');
  
  function getArray (fileName) {
    return read(path.join(DATA_DIR, fileName));
  }
  
  var exports = {};
  
  /**
  * @property {NdArray} digit - 28x28 grayscale image with an handwritten digit extracted from MNIST database
  */
  Object.defineProperty(exports, 'digit', {
    get: function () {
      return getArray('five.png');
    }
  });
  
  /**
  * @property {NdArray} five - 28x28 grayscale image with an handwritten digit extracted from MNIST database
  */
  Object.defineProperty(exports, 'five', {
    get: function () {
      return getArray('five.png');
    }
  });
  
  /**
  * @property {NdArray} node - 300x600 COLOR image representing Node.js's logo
  */
  Object.defineProperty(exports, 'node', {
    get: function () {
      return getArray('nodejs.png');
    }
  });
  
  /**
  * @property {NdArray} lena - The standard, yet sometimes controversial Lena test image was scanned from the November 1972 edition of Playboy magazine. From an image processing perspective, this image is useful because it contains smooth, textured, shaded as well as detail areas.
  */
  Object.defineProperty(exports, 'lena', {
    get: function () {
      return getArray('lenna.png');
    }
  });
  
  /**
  * @property {NdArray} lenna - The standard, yet sometimes controversial Lena test image was scanned from the November 1972 edition of Playboy magazine. From an image processing perspective, this image is useful because it contains smooth, textured, shaded as well as detail areas.
  */
  Object.defineProperty(exports, 'lenna', {
    get: function () {
      return getArray('lenna.png');
    }
  });
  
  /**
  * @property {NdArray} moon - This low-contrast image of the surface of the moon is useful for illustrating histogram equalization and contrast stretching.
  */
  Object.defineProperty(exports, 'moon', {
    get: function () {
      return getArray('moon.jpg');
    }
  });
  
  module.exports = exports;
  
  }).call(this,"/src/images")
  },{"./read":33,"path":20}],30:[function(require,module,exports){
  'use strict';
  
  var NdArray = require('../ndarray');
  
  module.exports = function flipImage (img) {
    return new NdArray(img.selection.step(null, -1));
  };
  
  },{"../ndarray":43}],31:[function(require,module,exports){
  'use strict';
  
  /**
   * This callback type is called `imgCallback` and is displayed as a global symbol.
   *
   * @callback imgCallback
   * @param {err} error - if any, null otherwise
   * @param {NdArray} - image represented as a (H, W, [K,]) array, with K the number of color channels. if image is grayscale (or B&W) then image only have two dimensions H and W
   */
  
  module.exports = {
    data: require('./data'),
    read: require('./read'),
    save: require('./save'),
    resize: require('./resize'),
    sat: require('./sat'),
    ssat: require('./ssat'),
    sobel: require('./sobel'),
    scharr: require('./scharr'),
    areaSum: require('./area-sum'),
    areaValue: require('./area-value'),
    rgb2gray: require('./rgb2gray'),
    flip: require('./flip')
  };
  
  },{"./area-sum":27,"./area-value":28,"./data":29,"./flip":30,"./read":33,"./resize":34,"./rgb2gray":35,"./sat":36,"./save":37,"./scharr":38,"./sobel":39,"./ssat":40}],32:[function(require,module,exports){
  'use strict';
  
  
  var NdArray = require('../ndarray');
  
  var doCheckIsGrayscale = require('cwise/lib/wrapper')({"args":["array","array","array"],"pre":{"body":"{this_isgray=!0}","args":[],"thisVars":["this_isgray"],"localVars":[]},"body":{"body":"{_inline_82_arg0_===_inline_82_arg1_&&_inline_82_arg1_===_inline_82_arg2_||(this_isgray=!1)}","args":[{"name":"_inline_82_arg0_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_82_arg1_","lvalue":false,"rvalue":true,"count":2},{"name":"_inline_82_arg2_","lvalue":false,"rvalue":true,"count":1}],"thisVars":["this_isgray"],"localVars":[]},"post":{"body":"{return this_isgray}","args":[],"thisVars":["this_isgray"],"localVars":[]},"debug":false,"funcName":"doCheckIsGrayscaleCwise","blockSize":64});
  
  module.exports = function isGrayscaleImage (arr) {
    if (arr instanceof NdArray) {
      arr = arr.selection;
    }
    var aShape = arr.shape;
    if (aShape.length === 1) {
      return false;
    }
    if (aShape.length === 2 || aShape.length === 3 && aShape[2] === 1) {
      return true;
    } else if (aShape.length === 3 && (aShape[2] === 3 || aShape[2] === 4)) {
      return doCheckIsGrayscale(arr.pick(null, null, 0), arr.pick(null, null, 1), arr.pick(null, null, 2));
    }
    return false;
  };
  
  },{"../ndarray":43,"cwise/lib/wrapper":8}],33:[function(require,module,exports){
  'use strict';
  
  /* global HTMLCanvasElement */
  
  var ndarray = require('ndarray');
  var NdArray = require('../ndarray');
  var errors = require('../errors');
  var isGrayscale = require('./is-grayscale');
  
  module.exports = function readImageDom (input) {
    if (input instanceof HTMLCanvasElement) {
      return processCanvas(input);
    } else if (input instanceof HTMLImageElement) {
      return processImg(input);
    } else {
      throw new errors.ValueError('expect input to be either an HTML Canvas or a (loaded) Image');
    }
  };
  
  function processCanvas (canvas) {
    var context = canvas.getContext('2d');
    var pixels = context.getImageData(0, 0, canvas.width, canvas.height);
  
    var shape = [canvas.width, canvas.height, 4];
    var stride = [4, 4 * canvas.width, 1];
    var wxh = ndarray(new Uint8Array(pixels.data), shape, stride, 0);
    var hxw = wxh.transpose(1, 0);
  
    if (isGrayscale(hxw)) {
      hxw = hxw.pick(null, null, 0);
    }
    return new NdArray(hxw);
  }
  
  function processImg (img) {
    var canvas = document.createElement('canvas');
    canvas.width = img.width;
    canvas.height = img.height;
    var context = canvas.getContext('2d');
    context.drawImage(img, 0, 0);
    var pixels = context.getImageData(0, 0, img.width, img.height);
  
    var shape = [img.width, img.height, 4];
    var stride = [4, 4 * img.width, 1];
    var wxh = ndarray(new Uint8Array(pixels.data), shape, stride, 0);
    var hxw = wxh.transpose(1, 0);
  
    if (isGrayscale(hxw)) {
      hxw = hxw.pick(null, null, 0);
    }
    return new NdArray(hxw);
  }
  
  },{"../errors":26,"../ndarray":43,"./is-grayscale":32,"ndarray":19}],34:[function(require,module,exports){
  'use strict';
  
  var _ = require('./utils');
  var ndarray = require('ndarray');
  var NdArray = require('../ndarray');
  
  module.exports = function resizeImageDom (img, height, width) {
    var iShape = img.shape;
    var H = iShape[0];
    var W = iShape[1];
    var K = iShape[2] || 1;
    var originalCanvas = document.createElement('canvas');
    originalCanvas.height = H; originalCanvas.width = W;
  
    var originalCtx = originalCanvas.getContext('2d');
    var originalImg = originalCtx.createImageData(W, H);
    var err = _.setRawData(img.selection, originalImg.data);
    if (err) { throw err; }
  
    // compute cropping
    var cfH = H / height;
    var cfW = W / width;
    var cf = Math.min(cfH, cfW);
    var cH = height * cf;
    var cW = width * cf;
    var cdH = (H - cf * height) / 2;
    var cdW = (W - cf * width) / 2;
  
    originalCtx.putImageData(originalImg, 0, 0);
    originalCtx.drawImage(originalCanvas, cdW, cdH, cW, cH, 0, 0, width, height);
  
    var resizedImg = originalCtx.getImageData(0, 0, width, height);
    var shape = [width | 0, height | 0, 4];
    var stride = [4, 4 * width | 0, 1];
    var wxh = ndarray(new Uint8Array(resizedImg.data), shape, stride, 0);
    var hxw = wxh.transpose(1, 0);
    if (iShape.length === 2) {
      hxw = hxw.pick(null, null, 0);
    } else if (iShape.length === 3 && K === 1) {
      hxw = hxw.pick(null, null, 0);
    }
    return new NdArray(hxw);
  };
  
  },{"../ndarray":43,"./utils":41,"ndarray":19}],35:[function(require,module,exports){
  'use strict';
  
  
  var NdArray = require('../ndarray');
  var __ = require('../utils');
  
  // takes ~157ms on a 5000x5000 image
  var doRgb2gray = require('cwise/lib/wrapper')({"args":["array","array","array","array"],"pre":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"body":{"body":"{_inline_79_arg0_=4899*_inline_79_arg1_+9617*_inline_79_arg2_+1868*_inline_79_arg3_+8192>>14}","args":[{"name":"_inline_79_arg0_","lvalue":true,"rvalue":false,"count":1},{"name":"_inline_79_arg1_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_79_arg2_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_79_arg3_","lvalue":false,"rvalue":true,"count":1}],"thisVars":[],"localVars":[]},"post":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"debug":false,"funcName":"rgb2grayCwise","blockSize":64});
  
  /**
   * Compute Grayscale version of an RGB image.
   * @param {NdArray}  img The image in RGB format. In a 3-D array of shape (h, w, 3), or in RGBA format with shape (h, w, 4).
   * @returns {NdArray} The grayscale image, a 3-D array  of shape (h, w, 1).
   */
  module.exports = function rgb2gray (img) {
    if (!(img instanceof NdArray)) {
      img = new NdArray(img); // assume it is an ndarray
    }
    var iShape = img.shape;
    var h = iShape[0];
    var w = iShape[1];
    var k = (iShape[2] || 1);
    if (k === 1) {
      return img; // already gray
    }
    var oShape = [h, w];
    var out = new NdArray(new Uint8Array(__.shapeSize(oShape)), oShape);
    var r = img.selection.pick(null, null, 0);
    var g = img.selection.pick(null, null, 1);
    var b = img.selection.pick(null, null, 2);
    doRgb2gray(out.selection, r, g, b);
  
    return out;
  };
  
  },{"../ndarray":43,"../utils":44,"cwise/lib/wrapper":8}],36:[function(require,module,exports){
  'use strict';
  
  
  var NdArray = require('../ndarray');
  var rgb2gray = require('./rgb2gray');
  
  var doIntegrate = require('cwise/lib/wrapper')({"args":["array","array","index",{"offset":[-1,-1],"array":0},{"offset":[-1,0],"array":0},{"offset":[0,-1],"array":0}],"pre":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"body":{"body":"{_inline_67_arg0_=0!==_inline_67_arg2_[0]&&0!==_inline_67_arg2_[1]?_inline_67_arg1_+_inline_67_arg4_+_inline_67_arg5_-_inline_67_arg3_:0===_inline_67_arg2_[0]&&0===_inline_67_arg2_[1]?_inline_67_arg1_:0===_inline_67_arg2_[0]?_inline_67_arg1_+_inline_67_arg5_:_inline_67_arg1_+_inline_67_arg4_}","args":[{"name":"_inline_67_arg0_","lvalue":true,"rvalue":false,"count":1},{"name":"_inline_67_arg1_","lvalue":false,"rvalue":true,"count":4},{"name":"_inline_67_arg2_","lvalue":false,"rvalue":true,"count":5},{"name":"_inline_67_arg3_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_67_arg4_","lvalue":false,"rvalue":true,"count":2},{"name":"_inline_67_arg5_","lvalue":false,"rvalue":true,"count":2}],"thisVars":[],"localVars":[]},"post":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"debug":false,"funcName":"doIntegrateBody","blockSize":64});
  
  /**
   * Compute Sum Area Table, also known as the integral of the image
   * @param {NdArray} img
   * @returns {NdArray}
   */
  module.exports = function computeSumAreaTable (img) {
    var gray = rgb2gray(img);
    var iShape = gray.shape;
    var iH = iShape[0];
    var iW = iShape[1];
    var out = new NdArray(new Uint32Array(iH * iW), [iH, iW]);
  
    doIntegrate(out.selection, gray.selection);
  
    return out;
  };
  
  },{"../ndarray":43,"./rgb2gray":35,"cwise/lib/wrapper":8}],37:[function(require,module,exports){
  'use strict';
  
  var _ = require('./utils');
  var errors = require('../errors');
  
  /**
   * Save image on the given destination
   *
   * @param {NdArray} img
   * @param {HTMLCanvasElement} dest
   */
  module.exports = function saveImageDom (img, dest) {
    var iShape = img.shape;
    var iH = iShape[0];
    var iW = iShape[1];
    if (dest instanceof HTMLCanvasElement) {
      var $tmp = document.createElement('canvas');
      $tmp.height = iH; $tmp.width = iW;
      var tmpCtx = $tmp.getContext('2d');
      var originalImg = tmpCtx.createImageData(iW, iH);
      var err = _.setRawData(img.selection, originalImg.data);
  
      if (err) { throw err; }
  
      tmpCtx.putImageData(originalImg, 0, 0);
      tmpCtx.drawImage($tmp, iW, iH);
      dest.getContext('2d').drawImage($tmp, 0, 0, iW, iH, 0, 0, dest.width, dest.height);
    } else {
      throw new errors.ValueError('expect input to be either an HTML Canvas or a (loaded) Image');
    }
  };
  
  },{"../errors":26,"./utils":41}],38:[function(require,module,exports){
  'use strict';
  
  
  var ops = require('ndarray-ops');
  var NdArray = require('../ndarray');
  var __ = require('../utils');
  var rgb2gray = require('./rgb2gray');
  
  var doScharr = require('cwise/lib/wrapper')({"args":["array","array",{"offset":[-1,-1],"array":1},{"offset":[-1,0],"array":1},{"offset":[-1,1],"array":1},{"offset":[0,-1],"array":1},{"offset":[0,1],"array":1},{"offset":[1,-1],"array":1},{"offset":[1,0],"array":1},{"offset":[1,1],"array":1}],"pre":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"body":{"body":"{var _inline_76_q=3*_inline_76_arg2_+10*_inline_76_arg3_+3*_inline_76_arg4_-3*_inline_76_arg7_-10*_inline_76_arg8_-3*_inline_76_arg9_,_inline_76_s=3*_inline_76_arg2_-3*_inline_76_arg4_+10*_inline_76_arg5_-10*_inline_76_arg6_+3*_inline_76_arg7_-3*_inline_76_arg9_;_inline_76_arg0_=Math.sqrt(_inline_76_s*_inline_76_s+_inline_76_q*_inline_76_q)}","args":[{"name":"_inline_76_arg0_","lvalue":true,"rvalue":false,"count":1},{"name":"_inline_76_arg1_","lvalue":false,"rvalue":false,"count":0},{"name":"_inline_76_arg2_","lvalue":false,"rvalue":true,"count":2},{"name":"_inline_76_arg3_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_76_arg4_","lvalue":false,"rvalue":true,"count":2},{"name":"_inline_76_arg5_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_76_arg6_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_76_arg7_","lvalue":false,"rvalue":true,"count":2},{"name":"_inline_76_arg8_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_76_arg9_","lvalue":false,"rvalue":true,"count":2}],"thisVars":[],"localVars":["_inline_76_q","_inline_76_s"]},"post":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"debug":false,"funcName":"doSobelBody","blockSize":64});
  
  /**
   * Find the edge magnitude using the Scharr transform.
   *
   * @note
   * Take the square root of the sum of the squares of the horizontal and vertical Scharrs to get a magnitude
   * that is somewhat insensitive to direction. The Scharr operator has a better rotation invariance than other
   * edge filters, such as the Sobel operators.
   *
   * @param {NdArray} img
   */
  module.exports = function computeScharr (img) {
    var gray = rgb2gray(img);
    var iShape = gray.shape;
    var iH = iShape[0];
    var iW = iShape[1];
    var out = new NdArray(new Float32Array(__.shapeSize(iShape)), iShape);
  
    doScharr(out.selection, gray.selection);
  
    // set borders to zero (invalid anyway)
    ops.assigns(out.selection.pick(0, null), 0); // first line
    ops.assigns(out.selection.pick(null, 0), 0); // first col
    ops.assigns(out.selection.pick(iH - 1, null), 0); // last line
    ops.assigns(out.selection.pick(null, iW - 1), 0); // last col
  
    return out.divide(16 * Math.sqrt(2), false);
  };
  
  },{"../ndarray":43,"../utils":44,"./rgb2gray":35,"cwise/lib/wrapper":8,"ndarray-ops":18}],39:[function(require,module,exports){
  'use strict';
  
  
  var ops = require('ndarray-ops');
  var NdArray = require('../ndarray');
  var __ = require('../utils');
  var rgb2gray = require('./rgb2gray');
  
  var doSobel = require('cwise/lib/wrapper')({"args":["array","array",{"offset":[-1,-1],"array":1},{"offset":[-1,0],"array":1},{"offset":[-1,1],"array":1},{"offset":[0,-1],"array":1},{"offset":[0,1],"array":1},{"offset":[1,-1],"array":1},{"offset":[1,0],"array":1},{"offset":[1,1],"array":1}],"pre":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"body":{"body":"{var _inline_73_q=_inline_73_arg2_+2*_inline_73_arg3_+_inline_73_arg4_-_inline_73_arg7_-2*_inline_73_arg8_-_inline_73_arg9_,_inline_73_s=_inline_73_arg2_-_inline_73_arg4_+2*_inline_73_arg5_-2*_inline_73_arg6_+_inline_73_arg7_-_inline_73_arg9_;_inline_73_arg0_=Math.sqrt(_inline_73_s*_inline_73_s+_inline_73_q*_inline_73_q)}","args":[{"name":"_inline_73_arg0_","lvalue":true,"rvalue":false,"count":1},{"name":"_inline_73_arg1_","lvalue":false,"rvalue":false,"count":0},{"name":"_inline_73_arg2_","lvalue":false,"rvalue":true,"count":2},{"name":"_inline_73_arg3_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_73_arg4_","lvalue":false,"rvalue":true,"count":2},{"name":"_inline_73_arg5_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_73_arg6_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_73_arg7_","lvalue":false,"rvalue":true,"count":2},{"name":"_inline_73_arg8_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_73_arg9_","lvalue":false,"rvalue":true,"count":2}],"thisVars":[],"localVars":["_inline_73_q","_inline_73_s"]},"post":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"debug":false,"funcName":"doSobelBody","blockSize":64});
  
  /**
   * Find the edge magnitude using the Sobel transform.
   *
   * @note
   * Take the square root of the sum of the squares of the horizontal and vertical Sobels to get a magnitude that’s somewhat insensitive to direction.
   *
   * The 3x3 convolution kernel used in the horizontal and vertical Sobels is an approximation of the
   * gradient of the image (with some slight blurring since 9 pixels are used to compute the gradient at a given pixel).
   * As an approximation of the gradient, the Sobel operator is not completely rotation-invariant. The Scharr operator should be used for a better rotation invariance.
   * @param {NdArray} img
   */
  module.exports = function computeSobel (img) {
    var gray = rgb2gray(img);
    var iShape = gray.shape;
    var iH = iShape[0];
    var iW = iShape[1];
  
    var out = new NdArray(new Float32Array(__.shapeSize(iShape)), iShape);
  
    doSobel(out.selection, gray.selection);
  
    // set borders to zero (invalid anyway)
    ops.assigns(out.selection.pick(0, null), 0); // first line
    ops.assigns(out.selection.pick(null, 0), 0); // first col
    ops.assigns(out.selection.pick(iH - 1, null), 0); // last line
    ops.assigns(out.selection.pick(null, iW - 1), 0); // last col
  
    return out.divide(4 * Math.sqrt(2), false);
  };
  
  },{"../ndarray":43,"../utils":44,"./rgb2gray":35,"cwise/lib/wrapper":8,"ndarray-ops":18}],40:[function(require,module,exports){
  'use strict';
  
  
  var NdArray = require('../ndarray');
  var rgb2gray = require('./rgb2gray');
  
  var doIntegrate = require('cwise/lib/wrapper')({"args":["array","array","index",{"offset":[-1,-1],"array":0},{"offset":[-1,0],"array":0},{"offset":[0,-1],"array":0}],"pre":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"body":{"body":"{_inline_70_arg0_=0!==_inline_70_arg2_[0]&&0!==_inline_70_arg2_[1]?_inline_70_arg1_*_inline_70_arg1_+_inline_70_arg4_+_inline_70_arg5_-_inline_70_arg3_:0===_inline_70_arg2_[0]&&0===_inline_70_arg2_[1]?_inline_70_arg1_*_inline_70_arg1_:0===_inline_70_arg2_[0]?_inline_70_arg1_*_inline_70_arg1_+_inline_70_arg5_:_inline_70_arg1_*_inline_70_arg1_+_inline_70_arg4_}","args":[{"name":"_inline_70_arg0_","lvalue":true,"rvalue":false,"count":1},{"name":"_inline_70_arg1_","lvalue":false,"rvalue":true,"count":8},{"name":"_inline_70_arg2_","lvalue":false,"rvalue":true,"count":5},{"name":"_inline_70_arg3_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_70_arg4_","lvalue":false,"rvalue":true,"count":2},{"name":"_inline_70_arg5_","lvalue":false,"rvalue":true,"count":2}],"thisVars":[],"localVars":[]},"post":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"debug":false,"funcName":"doIntegrateBody","blockSize":64});
  
  /**
   * Compute Squared Sum Area Table, also known as the integral of the squared image
   * @param {NdArray} img
   * @returns {NdArray}
   */
  module.exports = function computeSquaredSumAreaTable (img) {
    var gray = rgb2gray(img);
    var iShape = gray.shape;
    var iH = iShape[0];
    var iW = iShape[1];
  
    var out = new NdArray(new Uint32Array(iH * iW), [iH, iW]);
  
    doIntegrate(out.selection, gray.selection);
  
    return out;
  };
  
  },{"../ndarray":43,"./rgb2gray":35,"cwise/lib/wrapper":8}],41:[function(require,module,exports){
  'use strict';
  
  var NdArray = require('../ndarray');
  
  /**
   *
   * @param {NdArray} array
   * @returns {*}
   */
  module.exports.getRawData = function getRawData (array) {
    if (array instanceof NdArray) {
      array = array.selection; // faster
    }
  
    var h;
    var w;
    var ptr = 0;
    var aShape = array.shape;
    var H = aShape[0];
    var W = aShape[1];
    var K = (aShape[2] || 1);
    var data = new Uint8Array(H * W * K);
  
    if (array.shape.length === 3) {
      if (K === 3) {
        for (h = 0; h < H; ++h) {
          for (w = 0; w < W; ++w) {
            data[ptr++] = array.get(h, w, 0);
            data[ptr++] = array.get(h, w, 1);
            data[ptr++] = array.get(h, w, 2);
          }
        }
      } else if (K === 4) {
        for (h = 0; h < H; ++h) {
          for (w = 0; w < W; ++w) {
            data[ptr++] = array.get(h, w, 0);
            data[ptr++] = array.get(h, w, 1);
            data[ptr++] = array.get(h, w, 2);
            data[ptr++] = array.get(h, w, 3);
          }
        }
      } else if (K === 1) {
        for (h = 0; h < H; ++h) {
          for (w = 0; w < W; ++w) {
            data[ptr++] = array.get(h, w, 0);
          }
        }
      } else {
        return new Error('Incompatible array shape');
      }
    } else if (array.shape.length === 2) {
      for (h = 0; h < H; ++h) {
        for (w = 0; w < W; ++w) {
          data[ptr++] = array.get(h, w);
        }
      }
    } else {
      return new Error('Invalid image');
    }
    return data;
  };
  
  module.exports.setRawData = function setRawData (array, data) {
    var h;
    var w;
    var ptr = 0;
    var c;
    var H = array.shape[0];
    var W = array.shape[1];
    var K = array.shape[2] || 1;
  
    if (array.shape.length === 3) {
      if (K === 3) {
        for (h = 0; h < H; ++h) {
          for (w = 0; w < W; ++w) {
            data[ptr++] = array.get(h, w, 0);
            data[ptr++] = array.get(h, w, 1);
            data[ptr++] = array.get(h, w, 2);
            data[ptr++] = 255;
          }
        }
      } else if (K === 4) {
        for (h = 0; h < H; ++h) {
          for (w = 0; w < W; ++w) {
            data[ptr++] = array.get(h, w, 0);
            data[ptr++] = array.get(h, w, 1);
            data[ptr++] = array.get(h, w, 2);
            data[ptr++] = array.get(h, w, 3);
          }
        }
      } else if (K === 1) {
        for (h = 0; h < H; ++h) {
          for (w = 0; w < W; ++w) {
            c = array.get(h, w, 0);
            data[ptr++] = c;
            data[ptr++] = c;
            data[ptr++] = c;
            data[ptr++] = 255;
          }
        }
      } else {
        return new Error('Incompatible array shape');
      }
    } else if (array.shape.length === 2) {
      for (h = 0; h < H; ++h) {
        for (w = 0; w < W; ++w) {
          c = array.get(h, w);
          data[ptr++] = c;
          data[ptr++] = c;
          data[ptr++] = c;
          data[ptr++] = 255;
        }
      }
    } else {
      return new Error('Invalid image');
    }
  };
  
  },{"../ndarray":43}],42:[function(require,module,exports){
  'use strict';
  
  var ndarray = require('ndarray');
  
  var ops = require('ndarray-ops');
  var ndFFT = require('ndarray-fft');
  
  var CONF = require('./config');
  var DTYPES = require('./dtypes');
  var NdArray = require('./ndarray');
  var _ = require('./utils');
  var errors = require('./errors');
  
  function broadcast (shape1, shape2) {
    if (shape1.length === 0 || shape2.length === 0) {
      return;
    }
    var reversed1 = shape1.slice().reverse();
    var reversed2 = shape2.slice().reverse();
    var maxLength = Math.max(shape1.length, shape2.length);
    var outShape = new Array(maxLength);
    for (var i = 0; i < maxLength; i++) {
      if (!reversed1[i] || reversed1[i] === 1) {
        outShape[i] = reversed2[i];
      } else if (!reversed2[i] || reversed2[i] === 1) {
        outShape[i] = reversed1[i];
      } else if (reversed1[i] === reversed2[i]) {
        outShape[i] = reversed1[i];
      } else {
        return;
      }
    }
    return outShape.reverse();
  }
  
  /**
  * Add arguments, element-wise.
  *
  * @param {(NdArray|Array|number)} a
  * @param {(NdArray|Array|number)} b
  * @returns {NdArray}
  */
  function add (a, b) {
    return NdArray.new(a).add(b);
  }
  
  /**
  * Multiply arguments, element-wise.
  *
  * @param {(Array|NdArray)} a
  * @param {(Array|NdArray|number)} b
  * @returns {NdArray}
  */
  function multiply (a, b) {
    return NdArray.new(a).multiply(b);
  }
  
  /**
  * Divide `a` by `b`, element-wise.
  *
  * @param {(Array|NdArray)} a
  * @param {(Array|NdArray|number)} b
  * @returns {NdArray}
  */
  function divide (a, b) {
    return NdArray.new(a).divide(b);
  }
  
  /**
  * Subtract second argument from the first, element-wise.
  *
  * @param {(NdArray|Array|number)} a
  * @param {(NdArray|Array|number)} b
  * @returns {NdArray}
  */
  function subtract (a, b) {
    return NdArray.new(a).subtract(b);
  }
  
  /**
  * Return true if two arrays have the same shape and elements, false otherwise.
  * @param {(Array|NdArray)} array1
  * @param {(Array|NdArray)} array2
  * @returns {boolean}
  */
  function equal (array1, array2) {
    return NdArray.new(array1).equal(array2);
  }
  
  /**
  * Return a copy of the array collapsed into one dimension using row-major order (C-style)
  
  * @param {(Array|NdArray)} array
  * @returns {NdArray}
  */
  function flatten (array) {
    return NdArray.new(array).flatten();
  }
  
  /**
  * Gives a new shape to an array without changing its data.
  * @param {(Array|NdArray)} array
  * @param {Array} shape - The new shape should be compatible with the original shape. If an integer, then the result will be a 1-D array of that length
  * @returns {NdArray}
  */
  function reshape (array, shape) {
    return NdArray.new(array).reshape(shape);
  }
  
  /**
  * Calculate the exponential of all elements in the input array, element-wise.
  * @param {(Array|NdArray|number)} x
  * @returns {NdArray}
  */
  function exp (x) {
    return NdArray.new(x).exp();
  }
  
  /**
  * Calculate the positive square-root of all elements in the input array, element-wise.
  * @param {(Array|NdArray|number)} x
  * @returns {NdArray}
  */
  function sqrt (x) {
    return NdArray.new(x).sqrt();
  }
  
  /**
  * Raise first array elements to powers from second array, element-wise.
  *
  * @param {(Array|NdArray|number)} x1
  * @param {(Array|NdArray|number)} x2
  * @returns {NdArray}
  */
  function power (x1, x2) {
    return NdArray.new(x1).pow(x2);
  }
  
  /**
  * Return the sum of input array elements.
  *
  * @param {(Array|NdArray|number)} x
  * @returns {number}
  */
  function sum (x) {
    return NdArray.new(x).sum();
  }
  
  /**
  * Return the arithmetic mean of input array elements.
  *
  * @param {(Array|NdArray|number)} x
  * @returns {number}
  */
  function mean (x) {
    return NdArray.new(x).mean();
  }
  
  /**
  * Returns the standard deviation, a measure of the spread of a distribution, of the input array elements.
  *
  * @param {(Array|NdArray|number)} x
  * @returns {number}
  */
  function std (x, options) {
    return NdArray.new(x).std(options);
  }
  
  /**
  * Return the minimum value of the array
  *
  * @param {(Array|NdArray|number)} x
  * @returns {Number}
  */
  function min (x) {
    return NdArray.new(x).min();
  }
  
  /**
  * Return the maximum value of the array
  *
  * @param {(Array|NdArray|number)} x
  * @returns {Number}
  */
  function max (x) {
    return NdArray.new(x).max();
  }
  
  /**
  * Permute the dimensions of the input array according to the given axes.
  *
  * @param {(Array|NdArray|number)} x
  * @param {(number|...number)} [axes]
  * @returns {NdArray}
  * @example
  *
  arr = nj.arange(6).reshape(1,2,3)
  // array([[[ 0, 1, 2],
  //         [ 3, 4, 5]]])
  arr.T
  // array([[[ 0],
  //         [ 3]],
  //        [[ 1],
  //         [ 4]],
  //        [[ 2],
  //         [ 5]]])
  
  arr.transpose(1,0,2)
  // array([[[ 0, 1, 2]],
  //        [[ 3, 4, 5]]])
  
  */
  
  function transpose (x, axes) {
    return NdArray.new(x).transpose(axes);
  }
  
  /**
  * Return the inverse of the input array, element-wise.
  *
  * @param {(Array|NdArray|number)} x
  * @returns {NdArray}
  */
  function negative (x) {
    return NdArray.new(x).negative();
  }
  
  /**
  * Return evenly spaced values within a given interval.
  *
  * @param {int} [start=0] - Start of interval. The interval includes this value.
  * @param {int} stop - End of interval. The interval does not include this value.
  * @param {int} [step=1] - Spacing between values. The default step size is 1. If step is specified, start must also be given.
  * @param {(String|Object)} [dtype=Array] The type of the output array.
  *
  * @return {NdArray} Array of evenly spaced values.
  */
  function arange (start, stop, step, dtype) {
    if (arguments.length === 1) {
      return arange(0, start, 1, undefined);
    } else if (arguments.length === 2 && _.isNumber(stop)) {
      return arange(start, stop, 1, undefined);
    } else if (arguments.length === 2) {
      return arange(0, start, 1, stop);
    } else if (arguments.length === 3 && !_.isNumber(step)) {
      return arange(start, stop, 1, step);
    }
    var result = [];
    var i = 0;
    while (start < stop) {
      result[i++] = start;
      start += step;
    }
    return NdArray.new(result, dtype);
  }
  
  /**
  * Return a new array of given shape and type, filled with zeros.
  *
  * @param {(Array|int)} shape - Shape of the new array, e.g., [2, 3] or 2.
  * @param {(String|Object)}  [dtype=Array]  The type of the output array.
  *
  * @return {NdArray} Array of zeros with the given shape and dtype
  */
  function zeros (shape, dtype) {
    if (_.isNumber(shape) && shape >= 0) {
      shape = [shape];
    }
    var s = _.shapeSize(shape);
    var T = _.getType(dtype);
    var arr = new NdArray(new T(s), shape);
    if (arr.dtype === 'array') {
      ops.assigns(arr.selection, 0);
    }
    return arr;
  }
  
  /**
  * Return a new array of given shape and type, filled with ones.
  *
  * @param {(Array|int)} shape - Shape of the new array, e.g., [2, 3] or 2.
  * @param {(String|Object)}  [dtype=Array] - The type of the output array.
  *
  * @return {NdArray} Array of ones with the given shape and dtype
  */
  function ones (shape, dtype) {
    if (_.isNumber(shape) && shape >= 0) {
      shape = [shape];
    }
    var s = _.shapeSize(shape);
    var T = _.getType(dtype);
    var arr = new NdArray(new T(s), shape);
    ops.assigns(arr.selection, 1);
    return arr;
  }
  
  /**
  * Return a new array of given shape and type, filled with `undefined` values.
  *
  * @param {(Array|int)} shape - Shape of the new array, e.g., [2, 3] or 2.
  * @param {(String|Object)}  [dtype=Array] - The type of the output array.
  *
  * @return {NdArray} Array of `undefined` values with the given shape and dtype
  */
  function empty (shape, dtype) {
    if (_.isNumber(shape) && shape >= 0) {
      shape = [shape];
    }
    var s = _.shapeSize(shape);
    var T = _.getType(dtype);
    return new NdArray(new T(s), shape);
  }
  
  /**
  * Create an array of the given shape and propagate it with random samples from a uniform distribution over [0, 1].
  * @param {number|Array|...number} shape - The dimensions of the returned array, should all be positive integers
  * @returns {NdArray}
  */
  function random (shape) {
    if (arguments.length === 0) {
      return NdArray.new(Math.random());
    } else if (arguments.length === 1) {
      shape = _.isNumber(shape) ? [shape | 0] : shape;
    } else {
      shape = [].slice.call(arguments);
    }
    var s = _.shapeSize(shape);
    var arr = new NdArray(new Float64Array(s), shape);
    ops.random(arr.selection);
    return arr;
  }
  
  /**
  * Return the softmax, or normalized exponential, of the input array, element-wise.
  * @param {(Array|NdArray|number)} x
  * @returns {NdArray}
  */
  function softmax (x) {
    var e = NdArray.new(x).exp();
    var se = e.sum(); // scalar
    ops.divseq(e.selection, se);
    return e;
  }
  
  var doSigmoid = require('cwise/lib/wrapper')({"args":["array","scalar"],"pre":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"body":{"body":"{_inline_43_arg0_=_inline_43_arg0_<-30?0:_inline_43_arg0_>30?1:1/(1+Math.exp(-1*_inline_43_arg1_*_inline_43_arg0_))}","args":[{"name":"_inline_43_arg0_","lvalue":true,"rvalue":true,"count":4},{"name":"_inline_43_arg1_","lvalue":false,"rvalue":true,"count":1}],"thisVars":[],"localVars":[]},"post":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"debug":false,"funcName":"sigmoidCwise","blockSize":64});
  
  /**
  * Return the sigmoid of the input array, element-wise.
  * @param {(Array|NdArray|number)} x
  * @param {number} [t=1] - stifness parameter
  * @returns {NdArray}
  */
  function sigmoid (x, t) {
    x = NdArray.new(x).clone();
    t = t || 1;
    doSigmoid(x.selection, t);
    return x;
  }
  
  var doClip = require('cwise/lib/wrapper')({"args":["array","scalar","scalar"],"pre":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"body":{"body":"{_inline_46_arg0_=Math.min(Math.max(_inline_46_arg1_,_inline_46_arg0_),_inline_46_arg2_)}","args":[{"name":"_inline_46_arg0_","lvalue":true,"rvalue":true,"count":2},{"name":"_inline_46_arg1_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_46_arg2_","lvalue":false,"rvalue":true,"count":1}],"thisVars":[],"localVars":[]},"post":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"debug":false,"funcName":"clipCwise","blockSize":64});
  
  /**
  * Clip (limit) the values in an array between min and max, element-wise.
  *
  * @param {(Array|NdArray|number)} x
  * @param {number} [min=0]
  * @param {number} [max=1]
  * @returns {NdArray}
  */
  function clip (x, min, max) {
    if (arguments.length === 1) {
      min = 0;
      max = 1;
    } else if (arguments.length === 2) {
      max = 1;
    }
    var s = (x instanceof NdArray) ? x.clone() : NdArray.new(x);
    doClip(s.selection, min, max);
    return s;
  }
  
  var doLeakyRelu = require('cwise/lib/wrapper')({"args":["array","scalar"],"pre":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"body":{"body":"{_inline_49_arg0_=Math.max(_inline_49_arg1_*_inline_49_arg0_,_inline_49_arg0_)}","args":[{"name":"_inline_49_arg0_","lvalue":true,"rvalue":true,"count":3},{"name":"_inline_49_arg1_","lvalue":false,"rvalue":true,"count":1}],"thisVars":[],"localVars":[]},"post":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"debug":false,"funcName":"leakyReluCwise","blockSize":64});
  
  function leakyRelu (x, alpha) {
    alpha = alpha || 1e-3;
    var s = (x instanceof NdArray) ? x.clone() : NdArray.new(x);
    doLeakyRelu(s.selection, alpha);
    return s;
  }
  
  var doTanh = require('cwise/lib/wrapper')({"args":["array"],"pre":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"body":{"body":"{_inline_52_arg0_=(Math.exp(2*_inline_52_arg0_)-1)/(Math.exp(2*_inline_52_arg0_)+1)}","args":[{"name":"_inline_52_arg0_","lvalue":true,"rvalue":true,"count":3}],"thisVars":[],"localVars":[]},"post":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"debug":false,"funcName":"tanhCwise","blockSize":64});
  
  /**
  * Return hyperbolic tangent of the input array, element-wise.
  *
  * @param {(Array|NdArray|number)} x
  * @returns {NdArray}
  */
  function tanh (x) {
    var s = (x instanceof NdArray) ? x.clone() : NdArray.new(x);
    doTanh(s.selection);
    return s;
  }
  
  /**
  * Return absolute value of the input array, element-wise.
  *
  * @param {(Array|NdArray|number)} x
  * @returns {NdArray}
  */
  function abs (x) {
    var s = (x instanceof NdArray) ? x.clone() : NdArray.new(x);
    ops.abseq(s.selection);
    return s;
  }
  
  /**
  * Return trigonometric cosine of the input array, element-wise.
  *
  * @param {(Array|NdArray|number)} x
  * @returns {NdArray}
  */
  function cos (x) {
    var s = (x instanceof NdArray) ? x.clone() : NdArray.new(x);
    ops.coseq(s.selection);
    return s;
  }
  
  /**
  * Return trigonometric inverse cosine of the input array, element-wise.
  *
  * @param {(Array|NdArray|number)} x
  * @returns {NdArray}
  */
  function arccos (x) {
    var s = (x instanceof NdArray) ? x.clone() : NdArray.new(x);
    ops.acoseq(s.selection);
    return s;
  }
  
  /**
  * Return trigonometric sine of the input array, element-wise.
  *
  * @param {(Array|NdArray|number)} x
  * @returns {NdArray}
  */
  function sin (x) {
    var s = (x instanceof NdArray) ? x.clone() : NdArray.new(x);
    ops.sineq(s.selection);
    return s;
  }
  
  /**
  * Return trigonometric inverse sine of the input array, element-wise.
  *
  * @param {(Array|NdArray|number)} x
  * @returns {NdArray}
  */
  function arcsin (x) {
    var s = (x instanceof NdArray) ? x.clone() : NdArray.new(x);
    ops.asineq(s.selection);
    return s;
  }
  
  /**
  * Return trigonometric tangent of the input array, element-wise.
  *
  * @param {(Array|NdArray|number)} x
  * @returns {NdArray}
  */
  function tan (x) {
    var s = (x instanceof NdArray) ? x.clone() : NdArray.new(x);
    ops.taneq(s.selection);
    return s;
  }
  
  /**
  * Return trigonometric inverse tangent of the input array, element-wise.
  *
  * @param {(Array|NdArray|number)} x
  * @returns {NdArray}
  */
  function arctan (x) {
    var s = (x instanceof NdArray) ? x.clone() : NdArray.new(x);
    ops.ataneq(s.selection);
    return s;
  }
  
  /**
  * Dot product of two arrays.
  *
  * WARNING: supported products are:
  *  - matrix dot matrix
  *  - vector dot vector
  *  - matrix dot vector
  *  - vector dot matrix
  * @param {(Array|NdArray)} a
  * @param {(Array|NdArray)} b
  * @returns {NdArray}
  */
  function dot (a, b) {
    return NdArray.new(a).dot(b);
  }
  
  /**
  * Join given arrays along the last axis.
  *
  * @param {...(Array|NdArray)} arrays
  * @returns {NdArray}
  */
  function concatenate (arrays) {
    if (arguments.length > 1) {
      arrays = [].slice.call(arguments);
    }
    var i, a;
    for (i = 0; i < arrays.length; i++) {
      a = arrays[i];
      arrays[i] = (a instanceof NdArray) ? a.tolist() : _.isNumber(a) ? [a] : a;
    }
    var m = arrays[0];
    for (i = 1; i < arrays.length; i++) {
      a = arrays[i];
      var mShape = _.getShape(m);
      var aShape = _.getShape(a);
      if (mShape.length !== aShape.length) {
        throw new errors.ValueError('all the input arrays must have same number of dimensions');
      } else if (mShape.length === 1 && aShape.length === 1) {
        m = m.concat(a);
      } else if ((mShape.length === 2 && aShape.length === 2 && mShape[0] === aShape[0]) ||
        (mShape.length === 1 && aShape.length === 2 && mShape[0] === aShape[0]) ||
        (mShape.length === 2 && aShape.length === 1 && mShape[0] === aShape[0])) {
        for (var row = 0; row < mShape[0]; row++) {
          m[row] = m[row].concat(a[row]);
        }
      } else if ((mShape.length === 3 && aShape.length === 3 && mShape[0] === aShape[0] && mShape[1] === aShape[1]) ||
        (mShape.length === 2 && aShape.length === 3 && mShape[0] === aShape[0] && mShape[1] === aShape[1]) ||
        (mShape.length === 3 && aShape.length === 2 && mShape[0] === aShape[0] && mShape[1] === aShape[1])) {
        for (var rowI = 0; rowI < mShape[0]; rowI++) {
          var rowV = new Array(mShape[1]);
          for (var colI = 0; colI < mShape[1]; colI++) {
            rowV[colI] = m[rowI][colI].concat(a[rowI][colI]);
          }
          m[rowI] = rowV;
        }
      } else {
        throw new errors.ValueError('cannot concatenate  "' + mShape + '" with "' + aShape + '"');
      }
    }
    return NdArray.new(m, arrays[0].dtype);
  }
  
  /**
  * Round an array to the to the nearest integer.
  *
  * @param {(Array|NdArray)} x
  * @returns {NdArray}
  */
  function round (x) {
    return NdArray.new(x).round();
  }
  
  /**
  * Convolve 2 N-dimensionnal arrays
  *
  * @note: Arrays must have the same dimensions and a must be greater than b.
  * @note: The convolution product is only given for points where the signals overlap completely. Values outside the signal boundary have no effect. This behaviour is known as the 'valid' mode.
  *
  * @param {Array|NdArray} a
  * @param {Array|NdArray} b
  */
  function convolve (a, b) {
    return NdArray.new(a).convolve(b);
  }
  
  /**
  * Convolve 2 N-dimensionnal arrays using Fast Fourier Transform (FFT)
  *
  * @note: Arrays must have the same dimensions and a must be greater than b.
  * @note: The convolution product is only given for points where the signals overlap completely. Values outside the signal boundary have no effect. This behaviour is known as the 'valid' mode.
  *
  * @param {Array|NdArray} a
  * @param {Array|NdArray} b
  */
  function fftconvolve (a, b) {
    return NdArray.new(a).fftconvolve(b);
  }
  
  function fft (x) {
    x = (x instanceof NdArray) ? x.clone() : NdArray.new(x);
    var xShape = x.shape;
    var d = xShape.length;
    if (xShape[d - 1] !== 2) {
      throw new errors.ValueError('expect last dimension of the array to have 2 values (for both real and imaginary part)');
    }
    var rPicker = new Array(d);
    var iPicker = new Array(d);
    rPicker[d - 1] = 0;
    iPicker[d - 1] = 1;
    ndFFT(1, x.selection.pick.apply(x.selection, rPicker), x.selection.pick.apply(x.selection, iPicker));
    return x;
  }
  
  function ifft (x) {
    x = (x instanceof NdArray) ? x.clone() : NdArray.new(x);
    var xShape = x.shape;
    var d = xShape.length;
    if (xShape[d - 1] !== 2) {
      throw new errors.ValueError('expect last dimension of the array to have 2 values (for both real and imaginary part)');
    }
    var rPicker = new Array(d);
    var iPicker = new Array(d);
    rPicker[d - 1] = 0;
    iPicker[d - 1] = 1;
    ndFFT(-1, x.selection.pick.apply(x.selection, rPicker), x.selection.pick.apply(x.selection, iPicker));
    return x;
  }
  
  /**
   * Extract a diagonal or construct a diagonal array.
   *
   * @param {Array|NdArray} x
   * @returns {NdArray} a view a of the original array when possible, a new array otherwise
   */
  function diag (x) {
    return NdArray.new(x).diag();
  }
  
  /**
   * The identity array is a square array with ones on the main diagonal.
   * @param {number} Number of rows (and columns) in n x n output.
   * @param {(String|Object)}  [dtype=Array]  The type of the output array.
   * @return {Array} n x n array with its main diagonal set to one, and all other elements 0
   */
  function identity (n, dtype) {
    var arr = zeros([n, n], dtype);
    for (var i = 0; i < n; i++) arr.set(i, i, 1);
    return arr;
  }
  
  /**
   * Join a sequence of arrays along a new axis.
   * The axis parameter specifies the index of the new axis in the dimensions of the result.
   * For example, if axis=0 it will be the first dimension and if axis=-1 it will be the last dimension.
   * @param {Array} sequence of array_like
   * @param {number} [axis=0] The axis in the result array along which the input arrays are stacked.
   * @return {Array} The stacked array has one more dimension than the input arrays.
   */
  function stack (arrays, axis) {
      axis = axis || 0;
      if (!arrays || arrays.length === 0) {
          throw new errors.ValueError('need at least one array to stack');
      }
      arrays = arrays.map(function (a) { return _.isNumber(a) ? a : NdArray.new(a); });
      var expectedShape = arrays[0].shape || []; // for numbers
  
      for (var i=1; i<arrays.length; i++){
        var shape = arrays[i].shape || []; // for numbers
        var len = Math.max(expectedShape.length, shape.length);
        for (var j = 0; j < len; j++){
          if (expectedShape[j] !== shape[j]) throw new errors.ValueError('all input arrays must have the same shape');
        }
      }
      var stacked;
      if (expectedShape.length === 0) { // stacking numbers
        stacked = concatenate(arrays);
      } else {
        stacked = zeros([arrays.length].concat(expectedShape));
        for (var i=0; i<arrays.length; i++) {
          stacked.pick(i).assign(arrays[i], false);
        }
      }
  
      if (axis) {
        // recompute neg axis
        if (axis < 0) axis = stacked.ndim + axis;
  
        var d = stacked.ndim;
        var axes = new Array(d);
        for (var i = 0; i < d; i++){
          axes[i] = i < axis ? i + 1 : i === axis ? 0 : i;
        }
  
        return stacked.transpose(axes);
      }
      return stacked;
  }
  
  module.exports = {
    config: CONF,
    dtypes: DTYPES,
    NdArray: NdArray,
    ndarray: ndarray,
    array: NdArray.new,
    arange: arange,
    reshape: reshape,
    zeros: zeros,
    ones: ones,
    empty: empty,
    flatten: flatten,
    random: random,
    softmax: softmax,
    sigmoid: sigmoid,
    leakyRelu: leakyRelu,
    abs: abs,
    arccos: arccos,
    arcsin: arcsin,
    arctan: arctan,
    cos: cos,
    sin: sin,
    tan: tan,
    tanh: tanh,
    clip: clip,
    exp: exp,
    sqrt: sqrt,
    power: power,
    sum: sum,
    mean: mean,
    std: std,
    dot: dot,
    add: add,
    subtract: subtract,
    multiply: multiply,
    divide: divide,
    negative: negative,
    equal: equal,
    max: max,
    min: min,
    concatenate: concatenate,
    transpose: transpose,
    errors: errors,
    broadcast: broadcast,
    round: round,
    convolve: convolve,
    fftconvolve: fftconvolve,
    fft: fft,
    ifft: ifft,
    diag: diag,
    identity: identity,
    stack: stack,
    int8: function (array) { return NdArray.new(array, 'int8'); },
    uint8: function (array) { return NdArray.new(array, 'uint8'); },
    int16: function (array) { return NdArray.new(array, 'int16'); },
    uint16: function (array) { return NdArray.new(array, 'uint16'); },
    int32: function (array) { return NdArray.new(array, 'int32'); },
    uint32: function (array) { return NdArray.new(array, 'uint32'); },
    float32: function (array) { return NdArray.new(array, 'float32'); },
    float64: function (array) { return NdArray.new(array, 'float64'); },
    images: require('./images')
  };
  
  },{"./config":24,"./dtypes":25,"./errors":26,"./images":31,"./ndarray":43,"./utils":44,"cwise/lib/wrapper":8,"ndarray":19,"ndarray-fft":14,"ndarray-ops":18}],43:[function(require,module,exports){
  'use strict';
  
  var ndarray = require('ndarray');
  
  var ops = require('ndarray-ops');
  var gemm = require('ndarray-gemm');
  var ndFFT = require('ndarray-fft');
  var ndPool = require('typedarray-pool');
  
  var CONF = require('./config');
  var errors = require('./errors');
  var _ = require('./utils');
  
  /**
  * Multidimensional, homogeneous array of fixed-size items
  *
  * The number of dimensions and items in an array is defined by its shape, which is a tuple of N positive
  * integers that specify the sizes of each dimension. The type of items in the array is specified by a separate
  * data-type object (dtype), one of which is associated with each NdArray.
  * @constructor
  */
  var NdArray = function NdArray () {
    if (arguments.length === 1) {
      this.selection = arguments[0];
    } else if (arguments.length === 0) {
      throw new errors.ValueError("Required argument 'data' not found");
    } else {
      this.selection = ndarray.apply(null, arguments);
    }
    /**
    * @property {Number} NdArray#size - Number of elements in the array.
    */
    Object.defineProperty(this, 'size', {
      get: function () {
        return this.selection.size;
      }.bind(this)
    });
    /**
    * The shape of the array
    *
    * @property {Array}
    * @name NdArray#shape
    * @readonly
    */
    Object.defineProperty(this, 'shape', {
      get: function () {
        return this.selection.shape;
      }.bind(this)
    });
    /**
    * Number of array dimensions.
    *
    * @property {Number}
    * @name NdArray#ndim
    * @readonly
    */
    Object.defineProperty(this, 'ndim', {
      get: function () {
        return this.selection.shape.length;
      }.bind(this)
    });
    /**
    * Data-type of the array’s elements.
    *
    * @property {String}
    * @name NdArray#dtype
    * @see {dtypes} for more information
    */
    Object.defineProperty(this, 'dtype', {
      get: function () {
        return this.selection.dtype;
      }.bind(this),
      set: function (dtype) {
        var T = _.getType(dtype);
        if (T !== _.getType(this.dtype)) {
          this.selection = ndarray(new T(this.selection.data), this.selection.shape, this.selection.stride, this.selection.offset);
        }
      }.bind(this)
    });
    /**
    * Permute the dimensions of the array.
    *
    * @property {String}
    * @name NdArray#T
    * @readonly
    */
    Object.defineProperty(this, 'T', {
      get: function () {
        return this.transpose();
      }.bind(this)
    });
  };
  
  NdArray.prototype.get = function () {
    var n = arguments.length;
    for (var i = 0; i < n; i++) {
      if (arguments[i] < 0) {
        arguments[i] += this.shape[i];
      }
    }
    return this.selection.get.apply(this.selection, arguments);
  };
  
  NdArray.prototype.set = function () {
    return this.selection.set.apply(this.selection, arguments);
  };
  
  NdArray.prototype.slice = function () {
    var d = this.ndim;
    var hi = new Array(d);
    var lo = new Array(d);
    var step = new Array(d);
    var tShape = this.shape;
  
    for (var i = 0; i < d; i++) {
      var arg = arguments[i];
      if (typeof arg === 'undefined') { break; }
      if (arg === null) { continue; }
      if (_.isNumber(arg)) {
        lo[i] = (arg < 0) ? arg + tShape[i] : arg;
        hi[i] = null;
        step[i] = 1;
      } else {
        // assume it is an array
        var start = (arg[0] < 0) ? arg[0] + tShape[i] : arg[0];
        var end = (arg[1] < 0) ? arg[1] + tShape[i] : arg[1];
        lo[i] = end ? start : 0;
        hi[i] = end ? end - start : start;
        step[i] = arg[2] || 1;
      }
    }
  
    var slo = this.selection.lo.apply(this.selection, lo);
    var shi = slo.hi.apply(slo, hi);
    var sstep = shi.step.apply(shi, step);
    return new NdArray(sstep);
  };
  
  /**
  * Return a subarray by fixing a particular axis
  *
  * @param {...(number|null)} axis
  * @returns {NdArray}
  *
  * @example
  arr = nj.arange(4*4).reshape(4,4)
  // array([[  0,  1,  2,  3],
  //        [  4,  5,  6,  7],
  //        [  8,  9, 10, 11],
  //        [ 12, 13, 14, 15]])
  
  arr.pick(1)
  // array([ 4, 5, 6, 7])
  
  arr.pick(null, 1)
  // array([  1,  5,  9, 13])
  */
  NdArray.prototype.pick = function (axis) {
    return new NdArray(this.selection.pick.apply(this.selection, arguments));
  };
  
  /**
  * Return a shifted view of the array. Think of it as taking the upper left corner of the image and dragging it inward
  *
  * @returns {NdArray}
  *
  * @example
  arr = nj.arange(4*4).reshape(4,4)
  // array([[  0,  1,  2,  3],
  //        [  4,  5,  6,  7],
  //        [  8,  9, 10, 11],
  //        [ 12, 13, 14, 15]])
  arr.lo(1,1)
  // array([[  5,  6,  7],
  //        [  9, 10, 11],
  //        [ 13, 14, 15]])
  */
  NdArray.prototype.lo = function () {
    return new NdArray(this.selection.lo.apply(this.selection, arguments));
  };
  
  /**
  * Return a sliced view of the array.
  *
  * @returns {NdArray}
  *
  * @example
  
  arr = nj.arange(4*4).reshape(4,4)
  // array([[  0,  1,  2,  3],
  //        [  4,  5,  6,  7],
  //        [  8,  9, 10, 11],
  //        [ 12, 13, 14, 15]])
  
  arr.hi(3,3)
  // array([[  0,  1,  2],
  //        [  4,  5,  6],
  //        [  8,  9, 10]])
  
  arr.lo(1,1).hi(2,2)
  // array([[ 5,  6],
  //        [ 9, 10]])
  
  */
  NdArray.prototype.hi = function () {
    return new NdArray(this.selection.hi.apply(this.selection, arguments));
  };
  
  NdArray.prototype.step = function () {
    return new NdArray(this.selection.step.apply(this.selection, arguments));
  };
  
  /**
  * Return a copy of the array collapsed into one dimension using row-major order (C-style)
  *
  * @returns {NdArray}
  */
  NdArray.prototype.flatten = function () {
    if (this.ndim === 1) { // already flattened
      return new NdArray(this.selection);
    }
    var T = _.getType(this.dtype);
    var arr = _.flatten(this.tolist(), true);
    if (!(arr instanceof T)) {
      arr = new T(arr);
    }
    return new NdArray(arr, [this.size]);
  };
  
  /**
  * Gives a new shape to the array without changing its data.
  * @param {Array|number} The new shape should be compatible with the original shape. If an integer, then the result will be a 1-D array of that length. One shape dimension can be -1. In this case, the value is inferred from the length of the array and remaining dimensions.
  * @returns {NdArray} a new view object if possible, a copy otherwise,
  */
  NdArray.prototype.reshape = function (shape) {
    if (arguments.length === 0) {
      throw new errors.ValueError('function takes at least one argument (0 given)');
    }
    if (arguments.length === 1 && _.isNumber(shape) && shape === -1) {
      shape = [_.shapeSize(this.shape)];
    }
    if (arguments.length === 1 && _.isNumber(shape)) {
      shape = [shape];
    }
    if (arguments.length > 1) {
      shape = [].slice.call(arguments);
    }
    if (shape.filter(function (s) { return s === -1; }).length > 1) {
      throw new errors.ValueError('can only specify one unknown dimension');
    }
    var currentShapeSize = _.shapeSize(shape);
    shape = shape.map(function (s) { return s === -1 ? -1 * this.size / currentShapeSize : s; }.bind(this));
    if (this.size !== _.shapeSize(shape)) {
      throw new errors.ValueError('total size of new array must be unchanged');
    }
    var selfShape = this.selection.shape;
    var selfOffset = this.selection.offset;
    var selfStride = this.selection.stride;
    var selfDim = selfShape.length;
    var d = shape.length;
    var stride;
    var offset;
    var i;
    var sz;
    if (selfDim === d) {
      var sameShapes = true;
      for (i = 0; i < d; ++i) {
        if (selfShape[i] !== shape[i]) {
          sameShapes = false;
          break;
        }
      }
      if (sameShapes) {
        return new NdArray(this.selection.data, selfShape, selfStride, selfOffset);
      }
    } else if (selfDim === 1) {
      // 1d view
      stride = new Array(d);
      for (i = d - 1, sz = 1; i >= 0; --i) {
        stride[i] = sz;
        sz *= shape[i];
      }
      offset = selfOffset;
      for (i = 0; i < d; ++i) {
        if (stride[i] < 0) {
          offset -= (shape[i] - 1) * stride[i];
        }
      }
      return new NdArray(this.selection.data, shape, stride, offset);
    }
  
    var minDim = Math.min(selfDim, d);
    var areCompatible = true;
    for (i = 0; i < minDim; i++) {
      if (selfShape[i] !== shape[i]) {
        areCompatible = false;
        break;
      }
    }
    if (areCompatible) {
      stride = new Array(d);
      for (i = 0; i < d; i++) {
        stride[i] = selfStride[i] || 1;
      }
      offset = selfOffset;
      return new NdArray(this.selection.data, shape, stride, offset);
    }
    return this.flatten().reshape(shape);
  };
  
  /**
  * Permute the dimensions of the array.
  *
  * @param {...number} [axes]
  * @returns {NfdArray}
  */
  NdArray.prototype.transpose = function (axes) {
    if (arguments.length === 0) {
      var d = this.ndim;
      axes = new Array(d);
      for (var i = 0; i < d; i++) {
        axes[i] = d - i - 1;
      }
    } else if (arguments.length > 1) {
      axes = arguments;
    }
    return new NdArray(this.selection.transpose.apply(this.selection, axes));
  };
  
  /**
  * Dot product of two arrays.
  *
  * @param {(Array|NdArray)} x
  * @returns {NdArray}
  */
  NdArray.prototype.dot = function (x) {
    x = (x instanceof NdArray) ? x : createArray(x, this.dtype);
    var tShape = this.shape;
    var xShape = x.shape;
  
    if (tShape.length === 2 && xShape.length === 2 && tShape[1] === xShape[0]) { // matrix/matrix
      var T = _.getType(this.dtype);
      var c = new NdArray(new T(tShape[0] * xShape[1]), [tShape[0], xShape[1]]);
      gemm(c.selection, this.selection, x.selection);
      return c;
    } else if (tShape.length === 1 && xShape.length === 2 && tShape[0] === xShape[0]) { // vector/matrix
      return this.reshape([tShape[0], 1]).T.dot(x).reshape(xShape[1]);
    } else if (tShape.length === 2 && xShape.length === 1 && tShape[1] === xShape[0]) { // matrix/vector
      return this.dot(x.reshape([xShape[0], 1])).reshape(tShape[0]);
    } else if (tShape.length === 1 && xShape.length === 1 && tShape[0] === xShape[0]) { // vector/vector
      return this.reshape([tShape[0], 1]).T.dot(x.reshape([xShape[0], 1])).reshape([1]);
    } else {
      throw new errors.ValueError('cannot compute the matrix product of given arrays');
    }
  };
  
  /**
  * Assign `x` to the array, element-wise.
  *
  * @param {(NdArray|Array|number)} x
  * @param {boolean} [copy=true]
  * @returns {NdArray}
  */
  NdArray.prototype.assign = function (x, copy) {
    if (arguments.length === 1) {
      copy = true;
    }
    var arr = copy ? this.clone() : this;
  
    if (_.isNumber(x)) {
      ops.assigns(arr.selection, x);
      return arr;
    }
    x = createArray(x, this.dtype);
    ops.assign(arr.selection, x.selection);
    return arr;
  };
  
  /**
  * Add `x` to the array, element-wise.
  *
  * @param {(NdArray|Array|number)} x
  * @param {boolean} [copy=true]
  * @returns {NdArray}
  */
  NdArray.prototype.add = function (x, copy) {
    if (arguments.length === 1) {
      copy = true;
    }
    var arr = copy ? this.clone() : this;
  
    if (_.isNumber(x)) {
      ops.addseq(arr.selection, x);
      return arr;
    }
    x = createArray(x, this.dtype);
    ops.addeq(arr.selection, x.selection);
    return arr;
  };
  
  /**
  * Subtract `x` to the array, element-wise.
  *
  * @param {(NdArray|Array|number)} x
  * @param {boolean} [copy=true]
  * @returns {NdArray}
  */
  NdArray.prototype.subtract = function (x, copy) {
    if (arguments.length === 1) {
      copy = true;
    }
    var arr = copy ? this.clone() : this;
  
    if (_.isNumber(x)) {
      ops.subseq(arr.selection, x);
      return arr;
    }
    x = createArray(x, this.dtype);
    ops.subeq(arr.selection, x.selection);
    return arr;
  };
  
  /**
  * Multiply array by `x`, element-wise.
  *
  * @param {(NdArray|Array|number)} x
  * @param {boolean} [copy=true]
  * @returns {NdArray}
  */
  NdArray.prototype.multiply = function (x, copy) {
    if (arguments.length === 1) {
      copy = true;
    }
    var arr = copy ? this.clone() : this;
    if (_.isNumber(x)) {
      ops.mulseq(arr.selection, x);
      return arr;
    }
  
    x = createArray(x, this.dtype);
    ops.muleq(arr.selection, x.selection);
  
    return arr;
  };
  
  /**
  * Divide array by `x`, element-wise.
  *
  * @param {(NdArray|Array|number)} x
  * @param {boolean} [copy=true]
  * @returns {NdArray}
  */
  NdArray.prototype.divide = function (x, copy) {
    if (arguments.length === 1) {
      copy = true;
    }
    var arr = copy ? this.clone() : this;
    if (_.isNumber(x)) {
      ops.divseq(arr.selection, x);
      return arr;
    }
  
    x = createArray(x, this.dtype);
    ops.diveq(arr.selection, x.selection);
  
    return arr;
  };
  
  /**
  * Raise array elements to powers from given array, element-wise.
  *
  * @param {(NdArray|Array|number)} x
  * @param {boolean} [copy=true] - set to false to modify the array rather than create a new one
  * @returns {NdArray}
  */
  NdArray.prototype.pow = function (x, copy) {
    if (arguments.length === 1) { copy = true; }
    var arr = copy ? this.clone() : this;
    if (_.isNumber(x)) {
      ops.powseq(arr.selection, x);
      return arr;
    }
  
    x = createArray(x, this.dtype);
    ops.poweq(arr.selection, x.selection);
    return arr;
  };
  
  /**
  * Calculate the exponential of all elements in the array, element-wise.
  *
  * @param {boolean} [copy=true] - set to false to modify the array rather than create a new one
  * @returns {NdArray}
  */
  NdArray.prototype.exp = function (copy) {
    if (arguments.length === 0) { copy = true; }
    var arr = copy ? this.clone() : this;
    ops.expeq(arr.selection);
    return arr;
  };
  
  /**
  * Calculate the positive square-root of all elements in the array, element-wise.
  *
  * @param {boolean} [copy=true] - set to false to modify the array rather than create a new one
  * @returns {NdArray}
  */
  NdArray.prototype.sqrt = function (copy) {
    if (arguments.length === 0) { copy = true; }
    var arr = copy ? this.clone() : this;
    ops.sqrteq(arr.selection);
    return arr;
  };
  
  /**
  * Return the maximum value of the array
  *
  * @returns {Number}
  */
  NdArray.prototype.max = function () {
    if (this.selection.size === 0) {
      return null;
    }
    return ops.sup(this.selection);
  };
  
  /**
  * Return the minimum value of the array
  *
  * @returns {Number}
  */
  NdArray.prototype.min = function () {
    if (this.selection.size === 0) {
      return null;
    }
    return ops.inf(this.selection);
  };
  
  /**
  * Sum of array elements.
  *
  * @returns {number}
  */
  NdArray.prototype.sum = function () {
    return ops.sum(this.selection);
  };
  
  /**
  * Returns the standard deviation, a measure of the spread of a distribution, of the array elements.
  *
  * @param {object} {ddof:0}
  * @returns {number}
  */
  NdArray.prototype.std = function (options) {
    options = _.defaults(options, { 'ddof': 0 });
    var squares = this.clone();
    ops.powseq(squares.selection, 2);
    var mean = this.mean();
    var shapeSize = _.shapeSize(this.shape);
    var variance = ops.sum(squares.selection) / (shapeSize - options.ddof) - mean * mean * shapeSize / (shapeSize - options.ddof);
    
    return variance > 0 ? Math.sqrt(Math.abs(variance)) : 0;
  };
  
  /**
  * Return the arithmetic mean of array elements.
  *
  * @returns {number}
  */
  NdArray.prototype.mean = function () {
    return ops.sum(this.selection) / _.shapeSize(this.shape);
  };
  
  /**
  * Converts {NdArray} to a native JavaScript {Array}
  *
  * @returns {Array}
  */
  NdArray.prototype.tolist = function () {
    return unpackArray(this.selection);
  };
  
  NdArray.prototype.valueOf = function () {
    return this.tolist();
  };
  /**
  * Stringify the array to make it readable by a human.
  *
  * @returns {string}
  */
  NdArray.prototype.toString = function () {
    var nChars = formatNumber(this.max()).length;
  
    var reg1 = /\]\,(\s*)\[/g;
    var spacer1 = '],\n$1      [';
    var reg3 = /\]\,(\s+)...\,(\s+)\[/g;
    var spacer3 = '],\n$2       ...\n$2      [';
    var reg2 = /\[\s+\[/g;
    var spacer2 = '[[';
  
    function formatArray (k, v) {
      if (_.isString(v)) { return v; }
      if (_.isNumber(v)) {
        var s = formatNumber(v);
        return new Array(Math.max(0, nChars - s.length + 2)).join(' ') + s;
      }
      k = k || 0;
      var arr;
      var th = CONF.printThreshold;
      var hth = th / 2 | 0;
      if (v.length > th) {
        arr = [].concat(v.slice(0, hth), [' ...'], v.slice(v.length - hth));
      } else {
        arr = v;
      }
      return new Array(k + 1).join(' ') + '[' + arr.map(function (i, ii) {
        return formatArray(ii === 0 && k === 0 ? 1 : k + 1, i);
      }).join(',') + ']';
    }
  
    var base = JSON
      .stringify(this.tolist(), formatArray)
      .replace(reg1, spacer1)
      .replace(reg2, spacer2)
      .replace(reg2, spacer2)
      .replace(reg3, spacer3)
      .slice(2, -1);
    switch (this.dtype) {
      case 'array':
        return 'array([' + base + ')';
      default:
        return 'array([' + base + ', dtype=' + this.dtype + ')';
    }
  };
  
  /**
  * Stringify the array to make it readable in the console, by a human.
  *
  * @returns {string}
  */
  NdArray.prototype.inspect = NdArray.prototype.toString;
  
  /**
  * Stringify object to JSON
  * @returns {*}
  */
  NdArray.prototype.toJSON = function () {
    return JSON.stringify(this.tolist());
  };
  
  /**
  * Create a full copy of the array
  *
  * @returns {NdArray}
  */
  NdArray.prototype.clone = function () {
    var s = this.selection;
    if (typeof s.data.slice === 'undefined') {
      return new NdArray(ndarray([].slice.apply(s.data), s.shape, s.stride, s.offset)); // for legacy browsers
    }
    return new NdArray(ndarray(s.data.slice(), s.shape, s.stride, s.offset));
  };
  
  /**
  * Return true if two arrays have the same shape and elements, false otherwise.
  * @param {(Array|NdArray)} array
  * @returns {boolean}
  */
  NdArray.prototype.equal = function (array) {
    array = createArray(array);
    if (this.size !== array.size || this.ndim !== array.ndim) {
      return false;
    }
    var d = this.ndim;
    for (var i = 0; i < d; i++) {
      if (this.shape[i] !== array.shape[i]) {
        return false;
      }
    }
  
    return ops.all(ops.eqeq(this.selection, array.selection));
  };
  
  /**
  * Round array to the to the nearest integer.
  *
  * @param {boolean} [copy=true]
  * @returns {NdArray}
  */
  NdArray.prototype.round = function (copy) {
    if (arguments.length === 0) {
      copy = true;
    }
    var arr = copy ? this.clone() : this;
    ops.roundeq(arr.selection);
    return arr;
  };
  
  /**
  * Return the inverse of the array, element-wise.
  *
  * @returns {NdArray}
  */
  NdArray.prototype.negative = function () {
    var c = this.clone();
    ops.neg(c.selection, this.selection);
    return c;
  };
  
  NdArray.prototype.diag = function () {
    var d = this.ndim;
    if (d === 1) {
      // input is a vector => return a diagonal matrix
      var T = _.getType(this.dtype);
      var shape = [this.shape[0], this.shape[0]];
      var arr = new NdArray(new T(_.shapeSize(shape)), shape);
      if (arr.dtype === 'array') {
        ops.assigns(arr.selection, 0);
      }
      for (var i = 0; i < this.shape[0]; i++) arr.set(i, i, this.get(i));
      return arr;
    }
    var mshape = this.shape;
    var mstride = this.selection.stride;
    var nshape = (1 << 30);
    var nstride = 0;
    for (var i = 0; i < d; ++i) {
      nshape = Math.min(nshape, mshape[i]) | 0;
      nstride += mstride[i];
    }
    return new NdArray(this.selection.data, [nshape], [nstride], this.selection.offset);
  };
  
  NdArray.prototype.iteraxis = function (axis, cb) {
    var shape = this.shape;
    if (axis === -1) {
      axis = shape.length - 1;
    }
    if (axis < 0 || axis > shape.length - 1) {
      throw new errors.ValueError('invalid axis');
    }
    for (var i = 0; i < shape[axis]; i++) {
      var loc = new Array(axis + 1);
      for (var ii = 0; ii < axis + 1; ii++) {
        loc[ii] = (ii === axis) ? i : null;
      }
      var subArr = this.selection.pick.apply(this.selection, loc);
      var xi = createArray(unpackArray(subArr), this.dtype);
      cb(xi, i);
    }
  };
  
  var doConjMuleq = require('cwise/lib/wrapper')({"args":["array","array","array","array"],"pre":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"body":{"body":"{var _inline_55_c=_inline_55_arg2_,_inline_55_f=_inline_55_arg3_,_inline_55_i=_inline_55_arg0_,_inline_55_o=_inline_55_arg1_,_inline_55_t=_inline_55_i*(_inline_55_c+_inline_55_f);_inline_55_arg0_=_inline_55_t-_inline_55_f*(_inline_55_i+_inline_55_o),_inline_55_arg1_=_inline_55_t+_inline_55_c*(_inline_55_o-_inline_55_i)}","args":[{"name":"_inline_55_arg0_","lvalue":true,"rvalue":true,"count":2},{"name":"_inline_55_arg1_","lvalue":true,"rvalue":true,"count":2},{"name":"_inline_55_arg2_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_55_arg3_","lvalue":false,"rvalue":true,"count":1}],"thisVars":[],"localVars":["_inline_55_c","_inline_55_f","_inline_55_i","_inline_55_o","_inline_55_t"]},"post":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"debug":false,"funcName":"cwise","blockSize":64});
  
  var doConvolve3x3 = require('cwise/lib/wrapper')({"args":["array","array","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar",{"offset":[-1,-1],"array":1},{"offset":[-1,0],"array":1},{"offset":[-1,1],"array":1},{"offset":[0,-1],"array":1},{"offset":[0,1],"array":1},{"offset":[1,-1],"array":1},{"offset":[1,0],"array":1},{"offset":[1,1],"array":1}],"pre":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"body":{"body":"{_inline_58_arg0_=_inline_58_arg11_*_inline_58_arg10_+_inline_58_arg12_*_inline_58_arg9_+_inline_58_arg13_*_inline_58_arg8_+_inline_58_arg14_*_inline_58_arg7_+_inline_58_arg1_*_inline_58_arg6_+_inline_58_arg15_*_inline_58_arg5_+_inline_58_arg16_*_inline_58_arg4_+_inline_58_arg17_*_inline_58_arg3_+_inline_58_arg18_*_inline_58_arg2_}","args":[{"name":"_inline_58_arg0_","lvalue":true,"rvalue":false,"count":1},{"name":"_inline_58_arg1_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg2_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg3_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg4_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg5_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg6_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg7_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg8_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg9_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg10_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg11_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg12_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg13_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg14_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg15_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg16_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg17_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_58_arg18_","lvalue":false,"rvalue":true,"count":1}],"thisVars":[],"localVars":[]},"post":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"debug":false,"funcName":"cwise","blockSize":64});
  
  var doConvolve5x5 = require('cwise/lib/wrapper')({"args":["index","array","array","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar","scalar",{"offset":[-2,-2],"array":1},{"offset":[-2,-1],"array":1},{"offset":[-2,0],"array":1},{"offset":[-2,1],"array":1},{"offset":[-2,2],"array":1},{"offset":[-1,-2],"array":1},{"offset":[-1,-1],"array":1},{"offset":[-1,0],"array":1},{"offset":[-1,1],"array":1},{"offset":[-1,2],"array":1},{"offset":[0,-2],"array":1},{"offset":[0,-1],"array":1},{"offset":[0,1],"array":1},{"offset":[0,2],"array":1},{"offset":[1,-2],"array":1},{"offset":[1,-1],"array":1},{"offset":[1,0],"array":1},{"offset":[1,1],"array":1},{"offset":[1,2],"array":1},{"offset":[2,-2],"array":1},{"offset":[2,-1],"array":1},{"offset":[2,0],"array":1},{"offset":[2,1],"array":1},{"offset":[2,2],"array":1}],"pre":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"body":{"body":"{_inline_61_arg1_=_inline_61_arg0_[0]<2||_inline_61_arg0_[1]<2?0:_inline_61_arg28_*_inline_61_arg27_+_inline_61_arg29_*_inline_61_arg26_+_inline_61_arg30_*_inline_61_arg25_+_inline_61_arg31_*_inline_61_arg24_+_inline_61_arg32_*_inline_61_arg23_+_inline_61_arg33_*_inline_61_arg22_+_inline_61_arg34_*_inline_61_arg21_+_inline_61_arg35_*_inline_61_arg20_+_inline_61_arg36_*_inline_61_arg19_+_inline_61_arg37_*_inline_61_arg18_+_inline_61_arg38_*_inline_61_arg17_+_inline_61_arg39_*_inline_61_arg16_+_inline_61_arg2_*_inline_61_arg15_+_inline_61_arg40_*_inline_61_arg14_+_inline_61_arg41_*_inline_61_arg13_+_inline_61_arg42_*_inline_61_arg12_+_inline_61_arg43_*_inline_61_arg11_+_inline_61_arg44_*_inline_61_arg10_+_inline_61_arg45_*_inline_61_arg9_+_inline_61_arg46_*_inline_61_arg8_+_inline_61_arg47_*_inline_61_arg7_+_inline_61_arg48_*_inline_61_arg6_+_inline_61_arg49_*_inline_61_arg5_+_inline_61_arg50_*_inline_61_arg4_+_inline_61_arg51_*_inline_61_arg3_}","args":[{"name":"_inline_61_arg0_","lvalue":false,"rvalue":true,"count":2},{"name":"_inline_61_arg1_","lvalue":true,"rvalue":false,"count":1},{"name":"_inline_61_arg2_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg3_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg4_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg5_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg6_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg7_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg8_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg9_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg10_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg11_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg12_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg13_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg14_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg15_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg16_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg17_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg18_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg19_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg20_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg21_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg22_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg23_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg24_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg25_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg26_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg27_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg28_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg29_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg30_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg31_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg32_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg33_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg34_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg35_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg36_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg37_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg38_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg39_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg40_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg41_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg42_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg43_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg44_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg45_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg46_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg47_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg48_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg49_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg50_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_61_arg51_","lvalue":false,"rvalue":true,"count":1}],"thisVars":[],"localVars":[]},"post":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"debug":false,"funcName":"cwise","blockSize":64});
  
  /**
  * Returns the discrete, linear convolution of the array using the given filter.
  *
  * @note: Arrays must have the same dimensions and `filter` must be smaller than the array.
  * @note: The convolution product is only given for points where the signals overlap completely. Values outside the signal boundary have no effect. This behaviour is known as the 'valid' mode.
  * @note: Use optimized code for 3x3, 3x3x1, 5x5, 5x5x1 filters, FFT otherwise.
  *
  * @param {Array|NdArray} filter
  */
  NdArray.prototype.convolve = function (filter) {
    filter = NdArray.new(filter);
    var ndim = this.ndim;
    if (ndim !== filter.ndim) {
      throw new errors.ValueError('arrays must have the same dimensions');
    }
    var outShape = new Array(ndim);
    var step = new Array(ndim);
    var ts = this.selection;
    var tShape = this.shape;
    var fs = filter.selection;
    var fShape = filter.shape;
  
    for (var i = 0; i < ndim; i++) {
      var l = tShape[i] - fShape[i] + 1;
      if (l < 0) {
        throw new errors.ValueError('filter cannot be greater than the array');
      }
      outShape[i] = l;
      step[i] = -1;
    }
  
    if (ndim === 2 && fShape[0] === 3 && fShape[1] === 3) {
      var out3x3 = new NdArray(new Float32Array(_.shapeSize(tShape)), tShape);
      doConvolve3x3(
        out3x3.selection, // c
        ts, // x
        fs.get(0, 0), // fa
        fs.get(0, 1), // fb
        fs.get(0, 2), // fc
        fs.get(1, 0), // fd
        fs.get(1, 1), // fe
        fs.get(1, 2), // ff
        fs.get(2, 0), // fg
        fs.get(2, 1), // fh
        fs.get(2, 2) // fi
      );
      return out3x3.lo(1, 1).hi(outShape[0], outShape[1]);
    } else if (ndim === 3 && fShape[2] === 1 && tShape[2] === 1 && fShape[0] === 3 && fShape[1] === 3) {
      var out3x3x1 = new NdArray(new Float32Array(_.shapeSize(tShape)), tShape);
      doConvolve3x3(
        out3x3x1.selection.pick(null, null, 0), // c
        ts.pick(null, null, 0), // x
        fs.get(0, 0, 0), // fa
        fs.get(0, 1, 0), // fb
        fs.get(0, 2, 0), // fc
        fs.get(1, 0, 0), // fd
        fs.get(1, 1, 0), // fe
        fs.get(1, 2, 0), // ff
        fs.get(2, 0, 0), // fg
        fs.get(2, 1, 0), // fh
        fs.get(2, 2, 0) // fi
      );
      return out3x3x1.lo(1, 1).hi(outShape[0], outShape[1]);
    } else if (ndim === 2 && fShape[0] === 5 && fShape[1] === 5) {
      var out5x5 = new NdArray(new Float32Array(_.shapeSize(tShape)), tShape);
      doConvolve5x5(
        out5x5.selection, // c
        ts, // x
        fs.get(0, 0), // fa
        fs.get(0, 1), // fb
        fs.get(0, 2), // fc
        fs.get(0, 3), // fd
        fs.get(0, 4), // fe
        fs.get(1, 0), // ff
        fs.get(1, 1), // fg
        fs.get(1, 2), // fh
        fs.get(1, 3), // fi
        fs.get(1, 4), // fj
        fs.get(2, 0), // fk
        fs.get(2, 1), // fl
        fs.get(2, 2), // fm
        fs.get(2, 3), // fn
        fs.get(2, 4), // fo
        fs.get(3, 0), // fp
        fs.get(3, 1), // fq
        fs.get(3, 2), // fr
        fs.get(3, 3), // fs
        fs.get(3, 4), // ft
        fs.get(4, 0), // fu
        fs.get(4, 1), // fv
        fs.get(4, 2), // fw
        fs.get(4, 3), // fx
        fs.get(4, 4) // fy
      );
      return out5x5.lo(2, 2).hi(outShape[0], outShape[1]);
    } else if (ndim === 3 && fShape[2] === 1 && tShape[2] === 1 && fShape[0] === 5 && fShape[1] === 5) {
      var out5x5x1 = new NdArray(new Float32Array(_.shapeSize(tShape)), tShape);
      doConvolve5x5(
        out5x5x1.selection, // c
        ts, // x
        fs.get(0, 0, 0), // fa
        fs.get(0, 1, 0), // fb
        fs.get(0, 2, 0), // fc
        fs.get(0, 3, 0), // fd
        fs.get(0, 4, 0), // fe
        fs.get(1, 0, 0), // ff
        fs.get(1, 1, 0), // fg
        fs.get(1, 2, 0), // fh
        fs.get(1, 3, 0), // fi
        fs.get(1, 4, 0), // fj
        fs.get(2, 0, 0), // fk
        fs.get(2, 1, 0), // fl
        fs.get(2, 2, 0), // fm
        fs.get(2, 3, 0), // fn
        fs.get(2, 4, 0), // fo
        fs.get(3, 0, 0), // fp
        fs.get(3, 1, 0), // fq
        fs.get(3, 2, 0), // fr
        fs.get(3, 3, 0), // fs
        fs.get(3, 4, 0), // ft
        fs.get(4, 0, 0), // fu
        fs.get(4, 1, 0), // fv
        fs.get(4, 2, 0), // fw
        fs.get(4, 3, 0), // fx
        fs.get(4, 4, 0) // fy
      );
      return out5x5x1.lo(2, 2).hi(outShape[0], outShape[1]);
    } else {
      return this.fftconvolve(filter);
    }
  };
  
  NdArray.prototype.fftconvolve = function (filter) {
    filter = NdArray.new(filter);
  
    if (this.ndim !== filter.ndim) {
      throw new errors.ValueError('arrays must have the same dimensions');
    }
  
    var as = this.selection;
    var bs = filter.selection;
    var d = this.ndim;
    var nsize = 1;
    var nstride = new Array(d);
    var nshape = new Array(d);
    var oshape = new Array(d);
    var i;
    for (i = d - 1; i >= 0; --i) {
      nshape[i] = as.shape[i];
      nstride[i] = nsize;
      nsize *= nshape[i];
      oshape[i] = as.shape[i] - bs.shape[i] + 1;
    }
  
    var T = _.getType(as.dtype);
    var out = new NdArray(new T(_.shapeSize(oshape)), oshape);
    var outs = out.selection;
  
    var xT = ndPool.mallocDouble(nsize);
    var x = ndarray(xT, nshape, nstride, 0);
    ops.assigns(x, 0);
    ops.assign(x.hi.apply(x, as.shape), as);
  
    var yT = ndPool.mallocDouble(nsize);
    var y = ndarray(yT, nshape, nstride, 0);
    ops.assigns(y, 0);
  
    // FFT x/y
    ndFFT(1, x, y);
  
    var uT = ndPool.mallocDouble(nsize);
    var u = ndarray(uT, nshape, nstride, 0);
    ops.assigns(u, 0);
    ops.assign(u.hi.apply(u, bs.shape), bs);
  
    var vT = ndPool.mallocDouble(nsize);
    var v = ndarray(vT, nshape, nstride, 0);
    ops.assigns(v, 0);
  
    ndFFT(1, u, v);
  
    doConjMuleq(x, y, u, v);
  
    ndFFT(-1, x, y);
  
    var outShape = new Array(d);
    var outOffset = new Array(d);
    var needZeroFill = false;
    for (i = 0; i < d; ++i) {
      if (outs.shape[i] > nshape[i]) {
        needZeroFill = true;
      }
      outOffset[i] = bs.shape[i] - 1;
      outShape[i] = Math.min(outs.shape[i], nshape[i] - outOffset[i]);
    }
  
    var croppedX;
    if (needZeroFill) {
      ops.assign(outs, 0.0);
    }
    croppedX = x.lo.apply(x, outOffset);
    croppedX = croppedX.hi.apply(croppedX, outShape);
    ops.assign(outs.hi.apply(outs, outShape), croppedX);
  
    ndPool.freeDouble(xT);
    ndPool.freeDouble(yT);
    ndPool.freeDouble(uT);
    ndPool.freeDouble(vT);
    return out;
  };
  
  function createArray (arr, dtype) {
    if (arr instanceof NdArray) { return arr; }
    var T = _.getType(dtype);
    if (_.isNumber(arr)) {
      if (T !== Array) {
        return new NdArray(new T([arr]), [1]);
      } else {
        return new NdArray([arr], [1]);
      }
    }
    var shape = _.getShape(arr);
    if (shape.length > 1) {
      arr = _.flatten(arr, true);
    }
    if (!(arr instanceof T)) {
      arr = new T(arr);
    }
    return new NdArray(arr, shape);
  }
  NdArray.new = createArray;
  
  module.exports = NdArray;
  
  /*     utils    */
  function initNativeArray (shape, i) {
    i = i || 0;
    var c = shape[i] | 0;
    if (c <= 0) { return []; }
    var result = new Array(c);
    var j;
    if (i === shape.length - 1) {
      for (j = 0; j < c; ++j) {
        result[j] = 0;
      }
    } else {
      for (j = 0; j < c; ++j) {
        result[j] = initNativeArray(shape, i + 1);
      }
    }
    return result;
  }
  
  var doUnpack = require('cwise/lib/wrapper')({"args":["array","scalar","index"],"pre":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"body":{"body":"{var _inline_64_a,_inline_64_e=_inline_64_arg1_;for(_inline_64_a=0;_inline_64_a<_inline_64_arg2_.length-1;++_inline_64_a)_inline_64_e=_inline_64_e[_inline_64_arg2_[_inline_64_a]];_inline_64_e[_inline_64_arg2_[_inline_64_arg2_.length-1]]=_inline_64_arg0_}","args":[{"name":"_inline_64_arg0_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_64_arg1_","lvalue":false,"rvalue":true,"count":1},{"name":"_inline_64_arg2_","lvalue":false,"rvalue":true,"count":4}],"thisVars":[],"localVars":["_inline_64_a","_inline_64_e"]},"post":{"body":"{}","args":[],"thisVars":[],"localVars":[]},"debug":false,"funcName":"unpackCwise","blockSize":64});
  
  function unpackArray (arr) {
    var result = initNativeArray(arr.shape, 0);
    doUnpack(arr, result);
    return result;
  }
  
  function formatNumber (v) {
    return String(Number((v || 0).toFixed(CONF.nFloatingValues)));
  }
  
  },{"./config":24,"./errors":26,"./utils":44,"cwise/lib/wrapper":8,"ndarray":19,"ndarray-fft":14,"ndarray-gemm":16,"ndarray-ops":18,"typedarray-pool":22}],44:[function(require,module,exports){
  'use strict';
  var DTYPES = require('./dtypes');
  var _ = require('lodash');
  
  function isNumber (value) {
    return typeof value === 'number';
  }
  function isString (value) {
    return typeof value === 'string';
  }
  function isFunction (value) {
    return typeof value === 'function';
  }
  
  function baseFlatten (array, isDeep, result) {
    result = result || [];
    var index = -1;
    var length = array.length;
  
    while (++index < length) {
      var value = array[index];
      if (isNumber(value)) {
        result[result.length] = value;
      } else if (isDeep) {
        // Recursively flatten arrays (susceptible to call stack limits).
        baseFlatten(value, isDeep, result);
      } else {
        result.push(value);
      }
    }
  
    return result;
  }
  
  function shapeSize (shape) {
    var s = 1;
    for (var i = 0; i < shape.length; i++) {
      s *= shape[i];
    }
    return s;
  }
  
  function getType (dtype) {
    return isFunction(dtype) ? dtype : (DTYPES[dtype] || Array);
  }
  
  function _dim (x) {
    var ret = [];
    while (typeof x === 'object') { ret.push(x.length); x = x[0]; }
    return ret;
  }
  
  function getShape (array) {
    var y, z;
    if (typeof array === 'object') {
      y = array[0];
      if (typeof y === 'object') {
        z = y[0];
        if (typeof z === 'object') {
          return _dim(array);
        }
        return [array.length, y.length];
      }
      return [array.length];
    }
    return [];
  }
  
  // function haveSameShape (shape1, shape2) {
  //   if (shapeSize(shape1) !== shapeSize(shape2) || shape1.length !== shape2.length) {
  //     return false;
  //   }
  //   var d = shape1.length;
  //   for (var i = 0; i < d; i++) {
  //     if (shape1[i] !== shape2[i]) {
  //       return false;
  //     }
  //   }
  //   return true;
  // }
  
  module.exports = {
    isNumber: isNumber,
    isString: isString,
    isFunction: isFunction,
    flatten: baseFlatten,
    shapeSize: shapeSize,
    getType: getType,
    getShape: getShape,
    defaults: _.defaults
  };
  
  },{"./dtypes":25,"lodash":13}]},{},[42])(42)
  });