let const scope code example

Example 1: var vs let js

let: //only available inside the scope it's declared, like in "for" loop, 
var: //accessed outside the loop "for"

Example 2: const let var scope

var num = 1;   //var can be function or global scoped
const num = 2; //const can only be block scoped
let num = 3;   //let can only be block scoped