How can I get uppercase of a string in Javascript?

Question

I need to get the uppercase (or lowercase) of a string in Javascript, but that string can contain special characters of any alphabet in UTF-8 (for example, spanish ñ or ç, german ä, ö or ü, etc.).

How can I get this?

Answer 1

You would use toUpperCase():

console.log('ñç'.toUpperCase());