1 // 21.1.3.18 String.prototype.startsWith(searchString [, position ])
3 var $export = require('./_export')
4 , toLength = require('./_to-length')
5 , context = require('./_string-context')
6 , STARTS_WITH = 'startsWith'
7 , $startsWith = ''[STARTS_WITH];
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 , index = toLength(Math.min(arguments.length > 1 ? arguments[1] : undefined, that.length))
13 , search = String(searchString);
15 ? $startsWith.call(that, search, index)
16 : that.slice(index, index + search.length) === search;