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