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- // 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)
- , $$ = arguments
- , index = toLength(Math.min($$.length > 1 ? $$[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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