es.array.find-index.js
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es.array.find-index.js
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	'use strict';
	var $ = require('../internals/export');
	var $findIndex = require('../internals/array-iteration').findIndex;
	var addToUnscopables = require('../internals/add-to-unscopables');

	var FIND_INDEX = 'findIndex';
	var SKIPS_HOLES = true;

	// Shouldn't skip holes
	if (FIND_INDEX in []) Array(1)[FIND_INDEX](function () { SKIPS_HOLES = false; });

	// `Array.prototype.findIndex` method
	// https://tc39.es/ecma262/#sec-array.prototype.findindex
	$({ target: 'Array', proto: true, forced: SKIPS_HOLES }, {
	findIndex: function findIndex(callbackfn /* , that = undefined */) {
	return $findIndex(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
	}
	});

	// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
	addToUnscopables(FIND_INDEX);