Code Point

Convert char to code point and code point to string, similar to javascript's String.codePointAt and String.fromCodePoint. Demo.

What's the difference between Char.toCode and Char.CodePoint.fromChar?

From MDN:

The charCodeAt() method returns an integer between 0 and 65535 representing the UTF-16 code unit at the given index (the UTF-16 code unit matches the Unicode code point for code points representable in a single UTF-16 code unit, but might also be the first code unit of a surrogate pair for code points not representable in a single UTF-16 code unit, e.g. Unicode code points > 0x10000). If you want the entire code point value, use codePointAt().

This mean that not all chars exists in a single 16 bits representation, and Char.toCode only returns the first 16 bits code of any given char.

Here is an example to demonstrate how this can affect the output of Char.toCode and how Char.CodePoint.fromChar fix that:

Char.toCode '𝔸' == 55349
Char.fromCode 55349 == '�'


Char.CodePoint.fromChar '𝔸' == 120120
Char.CodePoint.toString 120120 == "𝔸"

You can try different chars in this demo.