| Leo Repp | 58b9f11 | 2021-11-22 11:57:47 +0100 | [diff] [blame^] | 1 | 'use strict'; |
| 2 | |
| 3 | var GetIntrinsic = require('get-intrinsic'); |
| 4 | |
| 5 | var $TypeError = GetIntrinsic('%TypeError%'); |
| 6 | |
| 7 | var isPrefixOf = require('../helpers/isPrefixOf'); |
| 8 | |
| 9 | // var callBound = require('call-bind/callBound'); |
| 10 | |
| 11 | // var $charAt = callBound('String.prototype.charAt'); |
| 12 | |
| 13 | var Type = require('./Type'); |
| 14 | |
| 15 | // https://262.ecma-international.org/9.0/#sec-isstringprefix |
| 16 | |
| 17 | module.exports = function IsStringPrefix(p, q) { |
| 18 | if (Type(p) !== 'String') { |
| 19 | throw new $TypeError('Assertion failed: "p" must be a String'); |
| 20 | } |
| 21 | |
| 22 | if (Type(q) !== 'String') { |
| 23 | throw new $TypeError('Assertion failed: "q" must be a String'); |
| 24 | } |
| 25 | |
| 26 | return isPrefixOf(p, q); |
| 27 | /* |
| 28 | if (p === q || p === '') { |
| 29 | return true; |
| 30 | } |
| 31 | |
| 32 | var pLength = p.length; |
| 33 | var qLength = q.length; |
| 34 | if (pLength >= qLength) { |
| 35 | return false; |
| 36 | } |
| 37 | |
| 38 | // assert: pLength < qLength |
| 39 | |
| 40 | for (var i = 0; i < pLength; i += 1) { |
| 41 | if ($charAt(p, i) !== $charAt(q, i)) { |
| 42 | return false; |
| 43 | } |
| 44 | } |
| 45 | return true; |
| 46 | */ |
| 47 | }; |