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node_modules/es-abstract/2018/IsStringPrefix.js
| 47 lines
| 952 B
| application/javascript
| JavascriptLexer
|
| r789 | 'use strict'; | |||
| var GetIntrinsic = require('../GetIntrinsic'); | ||||
| var $TypeError = GetIntrinsic('%TypeError%'); | ||||
| var isPrefixOf = require('../helpers/isPrefixOf'); | ||||
| // var callBound = require('../helpers/callBound'); | ||||
| // var $charAt = callBound('String.prototype.charAt'); | ||||
| var Type = require('./Type'); | ||||
| // https://www.ecma-international.org/ecma-262/9.0/#sec-isstringprefix | ||||
| module.exports = function IsStringPrefix(p, q) { | ||||
| if (Type(p) !== 'String') { | ||||
| throw new $TypeError('Assertion failed: "p" must be a String'); | ||||
| } | ||||
| if (Type(q) !== 'String') { | ||||
| throw new $TypeError('Assertion failed: "q" must be a String'); | ||||
| } | ||||
| return isPrefixOf(p, q); | ||||
| /* | ||||
| if (p === q || p === '') { | ||||
| return true; | ||||
| } | ||||
| var pLength = p.length; | ||||
| var qLength = q.length; | ||||
| if (pLength >= qLength) { | ||||
| return false; | ||||
| } | ||||
| // assert: pLength < qLength | ||||
| for (var i = 0; i < pLength; i += 1) { | ||||
| if ($charAt(p, i) !== $charAt(q, i)) { | ||||
| return false; | ||||
| } | ||||
| } | ||||
| return true; | ||||
| */ | ||||
| }; | ||||