JavaScript "Variables"

Hi all, I learned about variables in JavaScript recently.
Variables are containers which used to store data.

It can be declared in 4 ways.

• Using let e.g.,

let x=2;
let y=3;
let z=x+y;

• Using Const e.g.,

const x=3;
const y=4;
const z=x*y;

• Using Var e.g.,

var a=1;
var b=1;
var c=a-b;

• Automatically

a=10;
b=5;
c=a-b;