javascript touppercase

var str = "Hello World!";
var res = str.toUpperCase();  //HELLO WORLD!const names = ['Ali', 'Atta', 'Alex', 'John'];

const uppercased = names.map(name => name.toUpperCase());

console.log(uppercased);

// ['ALI', 'ATTA', 'ALEX', 'JOHN']
var str = "Hello World!";
var res = str.toUpperCase();str.toUpperCase();