main
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Last change
on this file since 79a0317 was 79a0317, checked in by stefan toskovski <stefantoska84@…>, 3 days ago |
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F4 Finalna Verzija
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Property mode
set to
100644
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File size:
760 bytes
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| [d565449] | 1 | 'use strict';
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| 2 |
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| [79a0317] | 3 | var callBound = require('call-bound');
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| [d565449] | 4 | var $TypeError = require('es-errors/type');
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| [79a0317] | 5 | var isInteger = require('math-intrinsics/isInteger');
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| [d565449] | 6 |
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| 7 | var StringToCodePoints = require('./StringToCodePoints');
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| 8 |
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| 9 | var $indexOf = callBound('String.prototype.indexOf');
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| 10 |
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| 11 | // https://262.ecma-international.org/13.0/#sec-getstringindex
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| 12 |
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| 13 | module.exports = function GetStringIndex(S, e) {
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| 14 | if (typeof S !== 'string') {
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| 15 | throw new $TypeError('Assertion failed: `S` must be a String');
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| 16 | }
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| 17 | if (!isInteger(e) || e < 0) {
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| 18 | throw new $TypeError('Assertion failed: `e` must be a non-negative integer');
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| 19 | }
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| 20 |
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| 21 | if (S === '') {
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| 22 | return 0;
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| 23 | }
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| 24 | var codepoints = StringToCodePoints(S);
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| 25 | var eUTF = e >= codepoints.length ? S.length : $indexOf(S, codepoints[e]);
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| 26 | return eUTF;
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| 27 | };
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