1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var aFunction = require('../internals/a-function');
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4 | var toObject = require('../internals/to-object');
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5 | var toLength = require('../internals/to-length');
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6 | var toString = require('../internals/to-string');
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7 | var fails = require('../internals/fails');
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8 | var internalSort = require('../internals/array-sort');
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9 | var arrayMethodIsStrict = require('../internals/array-method-is-strict');
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10 | var FF = require('../internals/engine-ff-version');
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11 | var IE_OR_EDGE = require('../internals/engine-is-ie-or-edge');
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12 | var V8 = require('../internals/engine-v8-version');
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13 | var WEBKIT = require('../internals/engine-webkit-version');
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14 |
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15 | var test = [];
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16 | var nativeSort = test.sort;
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17 |
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18 | // IE8-
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19 | var FAILS_ON_UNDEFINED = fails(function () {
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20 | test.sort(undefined);
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21 | });
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22 | // V8 bug
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23 | var FAILS_ON_NULL = fails(function () {
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24 | test.sort(null);
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25 | });
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26 | // Old WebKit
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27 | var STRICT_METHOD = arrayMethodIsStrict('sort');
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28 |
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29 | var STABLE_SORT = !fails(function () {
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30 | // feature detection can be too slow, so check engines versions
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31 | if (V8) return V8 < 70;
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32 | if (FF && FF > 3) return;
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33 | if (IE_OR_EDGE) return true;
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34 | if (WEBKIT) return WEBKIT < 603;
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35 |
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36 | var result = '';
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37 | var code, chr, value, index;
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38 |
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39 | // generate an array with more 512 elements (Chakra and old V8 fails only in this case)
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40 | for (code = 65; code < 76; code++) {
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41 | chr = String.fromCharCode(code);
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42 |
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43 | switch (code) {
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44 | case 66: case 69: case 70: case 72: value = 3; break;
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45 | case 68: case 71: value = 4; break;
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46 | default: value = 2;
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47 | }
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48 |
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49 | for (index = 0; index < 47; index++) {
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50 | test.push({ k: chr + index, v: value });
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51 | }
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52 | }
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53 |
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54 | test.sort(function (a, b) { return b.v - a.v; });
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55 |
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56 | for (index = 0; index < test.length; index++) {
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57 | chr = test[index].k.charAt(0);
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58 | if (result.charAt(result.length - 1) !== chr) result += chr;
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59 | }
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60 |
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61 | return result !== 'DGBEFHACIJK';
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62 | });
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63 |
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64 | var FORCED = FAILS_ON_UNDEFINED || !FAILS_ON_NULL || !STRICT_METHOD || !STABLE_SORT;
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65 |
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66 | var getSortCompare = function (comparefn) {
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67 | return function (x, y) {
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68 | if (y === undefined) return -1;
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69 | if (x === undefined) return 1;
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70 | if (comparefn !== undefined) return +comparefn(x, y) || 0;
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71 | return toString(x) > toString(y) ? 1 : -1;
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72 | };
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73 | };
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74 |
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75 | // `Array.prototype.sort` method
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76 | // https://tc39.es/ecma262/#sec-array.prototype.sort
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77 | $({ target: 'Array', proto: true, forced: FORCED }, {
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78 | sort: function sort(comparefn) {
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79 | if (comparefn !== undefined) aFunction(comparefn);
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80 |
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81 | var array = toObject(this);
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82 |
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83 | if (STABLE_SORT) return comparefn === undefined ? nativeSort.call(array) : nativeSort.call(array, comparefn);
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84 |
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85 | var items = [];
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86 | var arrayLength = toLength(array.length);
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87 | var itemsLength, index;
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88 |
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89 | for (index = 0; index < arrayLength; index++) {
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90 | if (index in array) items.push(array[index]);
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91 | }
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92 |
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93 | items = internalSort(items, getSortCompare(comparefn));
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94 | itemsLength = items.length;
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95 | index = 0;
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96 |
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97 | while (index < itemsLength) array[index] = items[index++];
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98 | while (index < arrayLength) delete array[index++];
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99 |
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100 | return array;
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101 | }
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102 | });
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