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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Property mode
set to
100644
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File size:
798 bytes
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| [d565449] | 1 | 'use strict';
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| 2 |
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| 3 | var $TypeError = require('es-errors/type');
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| 4 |
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| 5 | var callBound = require('call-bind/callBound');
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| 6 |
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| 7 | var $charCodeAt = callBound('String.prototype.charCodeAt');
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| 8 | var $numberToString = callBound('Number.prototype.toString');
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| 9 | var $toLowerCase = callBound('String.prototype.toLowerCase');
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| 10 | var $strSlice = callBound('String.prototype.slice');
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| 11 |
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| 12 | // https://262.ecma-international.org/9.0/#sec-unicodeescape
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| 13 |
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| 14 | module.exports = function UnicodeEscape(C) {
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| 15 | if (typeof C !== 'string' || C.length !== 1) {
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| 16 | throw new $TypeError('Assertion failed: `C` must be a single code unit');
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| 17 | }
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| 18 | var n = $charCodeAt(C, 0);
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| 19 | if (n > 0xFFFF) {
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| 20 | throw new $TypeError('`Assertion failed: numeric value of `C` must be <= 0xFFFF');
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| 21 | }
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| 22 |
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| 23 | return '\\u' + $strSlice('0000' + $toLowerCase($numberToString(n, 16)), -4);
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| 24 | };
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