Letter ł (l with tail) is represented in Unicode as U+0142, hex: xc5 x82, decimal: 197 130.
I have an array in JavaScript:
var b = [197, 130];
How to make string ł from it?
I tried this on JSFiddle:
var s;
s = String.fromCharCode(b[0], b[1]);
But then s is equal to Å (A with something on top).
I also tried other methods in the fiddle, but I can't get the correct result.
hex: xc5 x82
That's the UTF-8 byte encoding of ł.
s = String.fromCharCode(b[0], b[1]);
That's interpreting each byte as a single character, which is effectively decoding the bytes using the ISO-8859-1 encoding, because this encoding happens to share the same numbers as the first 256 characters of Unicode.
There is a neat JavaScript trick to turn a string where each character stands in for the byte of the same number, into a UTF-8 decoded string: send it through the legacy escape() builtin function, which is a broken URL-encoder, and then decode it using the real URL-decoder, decodeURIComponent.
So for any Array of UTF-8 bytes you can get the decoded Unicode String by doing:
function utf8BytesToString(b) {
return decodeURIComponent(escape(String.fromCharCode.apply(null, b)));
}
utf8BytesToString([0xc5, 0x82]) // "ł"
For two byte sequences you need to use mask 110xxxxx 10xxxxxx, which refers to:
var bytes = [0xc5, 0x82]; // [197, 130]
String.fromCharCode(((bytes[0] & 0x1f) << 6) | (bytes[1] & 0x3f)); // "ł"
You're probably after String.fromCodePoint:
String.fromCodePoint(128105, 8205, 128188) // 👩💼
// or if you have the hex values, parse them first:
String.fromCodePoint(parseInt("1F469", 16), parseInt("200D", 16), parseInt("1F4BC", 16)) // 👩💼
// for arbitrary numbers of points, use JS spread notation:
let codePoints = [128105, 8205, 128188];
String.fromCodePoint(...codePoints)
