git.r.bdr.sh - rbdr/dotfiles/blob

   1 'use strict';
   2
   3 var iteratorSymbol = require('es6-symbol').iterator
   4   , isArguments    = require('../../function/is-arguments')
   5   , isFunction     = require('../../function/is-function')
   6   , toPosInt       = require('../../number/to-pos-integer')
   7   , callable       = require('../../object/valid-callable')
   8   , validValue     = require('../../object/valid-value')
   9   , isString       = require('../../string/is-string')
  10
  11   , isArray = Array.isArray, call = Function.prototype.call
  12   , desc = { configurable: true, enumerable: true, writable: true, value: null }
  13   , defineProperty = Object.defineProperty;
  14
  15 module.exports = function (arrayLike/*, mapFn, thisArg*/) {
  16         var mapFn = arguments[1], thisArg = arguments[2], Constructor, i, j, arr, l, code, iterator
  17           , result, getIterator, value;
  18
  19         arrayLike = Object(validValue(arrayLike));
  20
  21         if (mapFn != null) callable(mapFn);
  22         if (!this || (this === Array) || !isFunction(this)) {
  23                 // Result: Plain array
  24                 if (!mapFn) {
  25                         if (isArguments(arrayLike)) {
  26                                 // Source: Arguments
  27                                 l = arrayLike.length;
  28                                 if (l !== 1) return Array.apply(null, arrayLike);
  29                                 arr = new Array(1);
  30                                 arr[0] = arrayLike[0];
  31                                 return arr;
  32                         }
  33                         if (isArray(arrayLike)) {
  34                                 // Source: Array
  35                                 arr = new Array(l = arrayLike.length);
  36                                 for (i = 0; i < l; ++i) arr[i] = arrayLike[i];
  37                                 return arr;
  38                         }
  39                 }
  40                 arr = [];
  41         } else {
  42                 // Result: Non plain array
  43                 Constructor = this;
  44         }
  45
  46         if (!isArray(arrayLike)) {
  47                 if ((getIterator = arrayLike[iteratorSymbol]) !== undefined) {
  48                         // Source: Iterator
  49                         iterator = callable(getIterator).call(arrayLike);
  50                         if (Constructor) arr = new Constructor();
  51                         result = iterator.next();
  52                         i = 0;
  53                         while (!result.done) {
  54                                 value = mapFn ? call.call(mapFn, thisArg, result.value, i) : result.value;
  55                                 if (!Constructor) {
  56                                         arr[i] = value;
  57                                 } else {
  58                                         desc.value = value;
  59                                         defineProperty(arr, i, desc);
  60                                 }
  61                                 result = iterator.next();
  62                                 ++i;
  63                         }
  64                         l = i;
  65                 } else if (isString(arrayLike)) {
  66                         // Source: String
  67                         l = arrayLike.length;
  68                         if (Constructor) arr = new Constructor();
  69                         for (i = 0, j = 0; i < l; ++i) {
  70                                 value = arrayLike[i];
  71                                 if ((i + 1) < l) {
  72                                         code = value.charCodeAt(0);
  73                                         if ((code >= 0xD800) && (code <= 0xDBFF)) value += arrayLike[++i];
  74                                 }
  75                                 value = mapFn ? call.call(mapFn, thisArg, value, j) : value;
  76                                 if (!Constructor) {
  77                                         arr[j] = value;
  78                                 } else {
  79                                         desc.value = value;
  80                                         defineProperty(arr, j, desc);
  81                                 }
  82                                 ++j;
  83                         }
  84                         l = j;
  85                 }
  86         }
  87         if (l === undefined) {
  88                 // Source: array or array-like
  89                 l = toPosInt(arrayLike.length);
  90                 if (Constructor) arr = new Constructor(l);
  91                 for (i = 0; i < l; ++i) {
  92                         value = mapFn ? call.call(mapFn, thisArg, arrayLike[i], i) : arrayLike[i];
  93                         if (!Constructor) {
  94                                 arr[i] = value;
  95                         } else {
  96                                 desc.value = value;
  97                                 defineProperty(arr, i, desc);
  98                         }
  99                 }
 100         }
 101         if (Constructor) {
 102                 desc.value = null;
 103                 arr.length = l;
 104         }
 105         return arr;
 106 };