UNPKG

930 BJavaScriptView Raw
1'use strict';
2var $ = require('../internals/export');
3var $findIndex = require('../internals/array-iteration').findIndex;
4var addToUnscopables = require('../internals/add-to-unscopables');
5var arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');
6
7var FIND_INDEX = 'findIndex';
8var SKIPS_HOLES = true;
9
10var USES_TO_LENGTH = arrayMethodUsesToLength(FIND_INDEX);
11
12// Shouldn't skip holes
13if (FIND_INDEX in []) Array(1)[FIND_INDEX](function () { SKIPS_HOLES = false; });
14
15// `Array.prototype.findIndex` method
16// https://tc39.es/ecma262/#sec-array.prototype.findindex
17$({ target: 'Array', proto: true, forced: SKIPS_HOLES || !USES_TO_LENGTH }, {
18 findIndex: function findIndex(callbackfn /* , that = undefined */) {
19 return $findIndex(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
20 }
21});
22
23// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
24addToUnscopables(FIND_INDEX);