2 var $ = require('../internals/export');
3 var $findIndex = require('../internals/array-iteration').findIndex;
4 var addToUnscopables = require('../internals/add-to-unscopables');
6 var FIND_INDEX = 'findIndex';
7 var SKIPS_HOLES = true;
9 // Shouldn't skip holes
10 if (FIND_INDEX in []) Array(1)[FIND_INDEX](function () { SKIPS_HOLES = false; });
12 // `Array.prototype.findIndex` method
13 // https://tc39.es/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);
20 // https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
21 addToUnscopables(FIND_INDEX);