string.ToUpperCase in js code example
Example 1: uppercase javascript
var str = "Hello World!";
var res = str.toUpperCase(); //HELLO WORLD!
Example 2: touppercase javascript array
const names = ['Ali', 'Atta', 'Alex', 'John'];
const uppercased = names.map(name => name.toUpperCase());
console.log(uppercased);
// ['ALI', 'ATTA', 'ALEX', 'JOHN']