letvarconsthoist.js

//Redeclare of let const var
var age="ninety";
var age="sixty";
console.log(age);   // var can be re declared that sixty replaced by ninety

// var can be re assigns
var color="green";
color="black";
console.log(color);

let tech="dotnet";
let tech="java";
console.log(tech);  // let cannot be redeclared 

const height="one";
const height="two";
console.log(height);  // const cannot be redeclared

// re assign of let const var

// let can be re assign 
let electronic="TV";
electronic="fan";
console.log(electronic);

// const cannot be re assign
const place="chennai";
place="cit";
console.log(place);



//scope -block of let var const

{
    let a="handbag";
    var b="pink";
    const c="yellow";
}

console.log(a); 
// let is block scoped {}
console.log(b); 
// var is function blocked and can be used within function
console.log(c); 
// const is blocked scoped {}

// hoisting of let var const ie printing before variable is assigned
console.log(type);
let type= "insta"; // let cannnot be hoisted
//////////////
console.log(type1);
var type1="whatapp";  // var can be hoisted but defined as undefined
///////
console.log(type2);
const type2="facebook";  // const cannot be hoisted