string-upcase

(string-upcase string-designator)

Returns a new string with every lowercase letter converted to uppercase; the original string is unchanged. The argument is a string designator, so a symbol or keyword is also accepted -- its name is used and a keyword's leading colon is dropped, so (string-upcase :foo) returns "FOO". In the WASM backend case conversion is ASCII-only, so only the letters a-z are affected and non-ASCII characters pass through untouched.