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- 'use strict';
- var $ = require('../internals/export');
- var aFunction = require('../internals/a-function');
- var toObject = require('../internals/to-object');
- var toLength = require('../internals/to-length');
- var fails = require('../internals/fails');
- var internalSort = require('../internals/array-sort');
- var arrayMethodIsStrict = require('../internals/array-method-is-strict');
- var FF = require('../internals/engine-ff-version');
- var IE_OR_EDGE = require('../internals/engine-is-ie-or-edge');
- var V8 = require('../internals/engine-v8-version');
- var WEBKIT = require('../internals/engine-webkit-version');
-
- var test = [];
- var nativeSort = test.sort;
-
- // IE8-
- var FAILS_ON_UNDEFINED = fails(function () {
- test.sort(undefined);
- });
- // V8 bug
- var FAILS_ON_NULL = fails(function () {
- test.sort(null);
- });
- // Old WebKit
- var STRICT_METHOD = arrayMethodIsStrict('sort');
-
- var STABLE_SORT = !fails(function () {
- // feature detection can be too slow, so check engines versions
- if (V8) return V8 < 70;
- if (FF && FF > 3) return;
- if (IE_OR_EDGE) return true;
- if (WEBKIT) return WEBKIT < 603;
-
- var result = '';
- var code, chr, value, index;
-
- // generate an array with more 512 elements (Chakra and old V8 fails only in this case)
- for (code = 65; code < 76; code++) {
- chr = String.fromCharCode(code);
-
- switch (code) {
- case 66: case 69: case 70: case 72: value = 3; break;
- case 68: case 71: value = 4; break;
- default: value = 2;
- }
-
- for (index = 0; index < 47; index++) {
- test.push({ k: chr + index, v: value });
- }
- }
-
- test.sort(function (a, b) { return b.v - a.v; });
-
- for (index = 0; index < test.length; index++) {
- chr = test[index].k.charAt(0);
- if (result.charAt(result.length - 1) !== chr) result += chr;
- }
-
- return result !== 'DGBEFHACIJK';
- });
-
- var FORCED = FAILS_ON_UNDEFINED || !FAILS_ON_NULL || !STRICT_METHOD || !STABLE_SORT;
-
- var getSortCompare = function (comparefn) {
- return function (x, y) {
- if (y === undefined) return -1;
- if (x === undefined) return 1;
- if (comparefn !== undefined) return +comparefn(x, y) || 0;
- return String(x) > String(y) ? 1 : -1;
- };
- };
-
- // `Array.prototype.sort` method
- // https://tc39.es/ecma262/#sec-array.prototype.sort
- $({ target: 'Array', proto: true, forced: FORCED }, {
- sort: function sort(comparefn) {
- if (comparefn !== undefined) aFunction(comparefn);
-
- var array = toObject(this);
-
- if (STABLE_SORT) return comparefn === undefined ? nativeSort.call(array) : nativeSort.call(array, comparefn);
-
- var items = [];
- var arrayLength = toLength(array.length);
- var itemsLength, index;
-
- for (index = 0; index < arrayLength; index++) {
- if (index in array) items.push(array[index]);
- }
-
- items = internalSort(items, getSortCompare(comparefn));
- itemsLength = items.length;
- index = 0;
-
- while (index < itemsLength) array[index] = items[index++];
- while (index < arrayLength) delete array[index++];
-
- return array;
- }
- });
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