Last change
on this file since 6a80231 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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Property mode
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100644
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File size:
610 bytes
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[6a3a178] | 1 | /* eslint-disable babel/new-cap, xo/throw-new-error */
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| 2 | 'use strict';
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| 3 | module.exports = function (str, pos) {
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| 4 | if (str === null || str === undefined) {
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| 5 | throw TypeError();
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| 6 | }
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| 7 |
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| 8 | str = String(str);
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| 9 |
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| 10 | var size = str.length;
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| 11 | var i = pos ? Number(pos) : 0;
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| 12 |
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| 13 | if (Number.isNaN(i)) {
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| 14 | i = 0;
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| 15 | }
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| 16 |
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| 17 | if (i < 0 || i >= size) {
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| 18 | return undefined;
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| 19 | }
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| 20 |
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| 21 | var first = str.charCodeAt(i);
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| 22 |
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| 23 | if (first >= 0xD800 && first <= 0xDBFF && size > i + 1) {
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| 24 | var second = str.charCodeAt(i + 1);
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| 25 |
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| 26 | if (second >= 0xDC00 && second <= 0xDFFF) {
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| 27 | return ((first - 0xD800) * 0x400) + second - 0xDC00 + 0x10000;
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| 28 | }
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| 29 | }
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| 30 |
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| 31 | return first;
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| 32 | };
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