es.typed-array.sort.js

'use strict';
var ArrayBufferViewCore = require('../internals/array-buffer-view-core');
var fails = require('../internals/fails');
var $sort = require('../internals/array-sort');
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 aTypedArray = ArrayBufferViewCore.aTypedArray;
var exportTypedArrayMethod = ArrayBufferViewCore.exportTypedArrayMethod;

var STABLE_SORT = !fails(function () {
  // feature detection can be too slow, so check engines versions
  if (V8) return V8 < 73;
  if (FF) return FF < 67;
  if (IE_OR_EDGE) return true;
  if (WEBKIT) return WEBKIT < 602;

  // eslint-disable-next-line es/no-typed-arrays -- required for testing
  var array = new Uint16Array(516);
  var expected = Array(516);
  var index, mod;

  for (index = 0; index < 516; index++) {
    mod = index % 4;
    array[index] = 515 - index;
    expected[index] = index - 2 * mod + 3;
  }

  array.sort(function (a, b) {
    return (a / 4 | 0) - (b / 4 | 0);
  });

  for (index = 0; index < 516; index++) {
    if (array[index] !== expected[index]) return true;
  }
});

// `%TypedArray%.prototype.sort` method
// https://tc39.es/ecma262/#sec-%typedarray%.prototype.sort
exportTypedArrayMethod('sort', function sort(comparefn) {
  return $sort.call(aTypedArray(this), comparefn);
}, !STABLE_SORT);