1// 21.1.3.18 String.prototype.startsWith(searchString [, position ])
2'use strict';
3var $export = require('./_export');
4var toLength = require('./_to-length');
5var context = require('./_string-context');
6var STARTS_WITH = 'startsWith';
7var $startsWith = ''[STARTS_WITH];
8
9$export($export.P + $export.F * require('./_fails-is-regexp')(STARTS_WITH), 'String', {
10  startsWith: function startsWith(searchString /* , position = 0 */) {
11    var that = context(this, searchString, STARTS_WITH);
12    var index = toLength(Math.min(arguments.length > 1 ? arguments[1] : undefined, that.length));
13    var search = String(searchString);
14    return $startsWith
15      ? $startsWith.call(that, search, index)
16      : that.slice(index, index + search.length) === search;
17  }
18});
19