1var str = "Hello World!";
2var res = str.toUpperCase();  //HELLO WORLD!

1
2let txt = "Hello World!";
3txt = txt.
4toUpperCase()
5;

1const upperCase = function(names){
2    const toLower = names.toLowerCase().split(' ');
3    const namesUpper = [];
4    for(const wordName of toLower){
5        namesUpper.push(wordName[0].toUpperCase() + wordName.slice(1));
6    }
7    return namesUpper.join(' ');
8}

1echo example | awk -F 'd' '{ print toupper($1)}'
2EXAMPLE		#Example first uppercased outputed