to lowercase in js code example

Example 1: javascript lowercase string

var str = "My Big Boy!"
var res = str.toLowerCase(); //res is "my big boy!"

Example 2: how to convert whole strig in lowercase in js

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

Example 3: String.toLower() js

const str = "Hello world!";
console.log(str); //Output: "Hello world!"
const String = str.toLowerCase();
console.log(String) //Output: "hello world!"