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48 lines
940 B
48 lines
940 B
4 years ago
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'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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