--- /dev/null
+// 21.1.3.18 String.prototype.startsWith(searchString [, position ])
+'use strict';
+var $export = require('./_export')
+ , toLength = require('./_to-length')
+ , context = require('./_string-context')
+ , STARTS_WITH = 'startsWith'
+ , $startsWith = ''[STARTS_WITH];
+
+$export($export.P + $export.F * require('./_fails-is-regexp')(STARTS_WITH), 'String', {
+ startsWith: function startsWith(searchString /*, position = 0 */){
+ var that = context(this, searchString, STARTS_WITH)
+ , index = toLength(Math.min(arguments.length > 1 ? arguments[1] : undefined, that.length))
+ , search = String(searchString);
+ return $startsWith
+ ? $startsWith.call(that, search, index)
+ : that.slice(index, index + search.length) === search;
+ }
+});
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