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