javascript string to uppercase

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

1str.toLowerCase()
2str.toUpperCase()

1var string = "To Upper Case";
2console.log(string.toUpperCase()); // TO UPPER CASE

1"foo bar!".toUpperCase();

1const str = 'flexiple';
2const str2 = str.charAt(0).toUpperCase() + str.slice(1);
3console.log(str2);
4
5//Output: Flexiple
6
7const str = 'abc efg';
8const str2 = str.charAt(0).toUpperCase() + str.slice(1);
9console.log(str2);
10
11//Output: Abc efg

1const String = "Node Express";
2const Upper = String.toUpperCase();