main
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Last change
on this file was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago |
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Update repo after prototype presentation
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File size:
821 bytes
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| 1 | 'use strict';
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| 2 |
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| 3 | var GetIntrinsic = require('get-intrinsic');
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| 4 |
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| 5 | var $TypeError = require('es-errors/type');
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| 6 | var $fromCharCode = GetIntrinsic('%String.fromCharCode%');
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| 7 |
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| 8 | // https://262.ecma-international.org/7.0/#sec-utf16decode
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| 9 |
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| 10 | var isLeadingSurrogate = require('../helpers/isLeadingSurrogate');
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| 11 | var isTrailingSurrogate = require('../helpers/isTrailingSurrogate');
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| 12 |
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| 13 | // https://262.ecma-international.org/11.0/#sec-utf16decodesurrogatepair
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| 14 |
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| 15 | module.exports = function UTF16Decode(lead, trail) {
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| 16 | if (!isLeadingSurrogate(lead) || !isTrailingSurrogate(trail)) {
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| 17 | throw new $TypeError('Assertion failed: `lead` must be a leading surrogate char code, and `trail` must be a trailing surrogate char code');
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| 18 | }
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| 19 | // var cp = (lead - 0xD800) * 0x400 + (trail - 0xDC00) + 0x10000;
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| 20 | return $fromCharCode(lead) + $fromCharCode(trail);
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| 21 | };
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