| // 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; |
| } |
| }); |