locutus
Version:
Locutus other languages' standard libraries to JavaScript for fun and educational purposes
22 lines (20 loc) • 854 B
JavaScript
;
module.exports = function chr(codePt) {
// discuss at: https://locutus.io/php/chr/
// original by: Kevin van Zonneveld (https://kvz.io)
// improved by: Brett Zamir (https://brett-zamir.me)
// example 1: chr(75) === 'K'
// example 1: chr(65536) === '\uD800\uDC00'
// returns 1: true
// returns 1: true
if (codePt > 0xFFFF) {
// Create a four-byte string (length 2) since this code point is high
// enough for the UTF-16 encoding (JavaScript internal use), to
// require representation with two surrogates (reserved non-characters
// used for building other characters; the first is "high" and the next "low")
codePt -= 0x10000;
return String.fromCharCode(0xD800 + (codePt >> 10), 0xDC00 + (codePt & 0x3FF));
}
return String.fromCharCode(codePt);
};
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