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47 lines
940 B
47 lines
940 B
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var $TypeError = GetIntrinsic('%TypeError%'); |
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var isPrefixOf = require('../helpers/isPrefixOf'); |
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// var callBound = require('call-bind/callBound'); |
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// var $charAt = callBound('String.prototype.charAt'); |
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var Type = require('./Type'); |
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// https://262.ecma-international.org/9.0/#sec-isstringprefix |
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module.exports = function IsStringPrefix(p, q) { |
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if (Type(p) !== 'String') { |
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throw new $TypeError('Assertion failed: "p" must be a String'); |
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} |
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if (Type(q) !== 'String') { |
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throw new $TypeError('Assertion failed: "q" must be a String'); |
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} |
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return isPrefixOf(p, q); |
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/* |
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if (p === q || p === '') { |
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return true; |
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} |
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var pLength = p.length; |
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var qLength = q.length; |
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if (pLength >= qLength) { |
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return false; |
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} |
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// assert: pLength < qLength |
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for (var i = 0; i < pLength; i += 1) { |
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if ($charAt(p, i) !== $charAt(q, i)) { |
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return false; |
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} |
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} |
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return true; |
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*/ |
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};
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