javascript to convert string to uppercase code example

Example 1: uppercase javascript

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

Example 2: uppercase and lowercase letters in js

str.toLowerCase()
str.toUpperCase()

Example 3: to upper javascrit

var str = "Hello World!";
var res = str.toUpperCase();

Example 4: uppercase in javascript

"foo bar!".toUpperCase();