Converts all characters in this string to upper case. If the string is already in all upper case, this method returns this.
Converts all characters in this string to upper case.
If the string is already in all upper case, this method returns this
.
'alphabet'.toUpperCase(); // 'ALPHABET'
'ABC'.toUpperCase(); // 'ABC'
This function uses the language independent Unicode mapping and thus only works in some languages.