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