TypeScript Hindi Tutorial #6 - Null & Undefined Data Types


Null & Undefined

  1. What is Null Data Type
  2. How to use it
  3. What is Undefined Data Type
  4. How to use Undefined
  5. Possible Values
  6. Run with html file


null.ts

var data : null | string =null;
var userName:null|string=null
var login=true
if(login){
userName="Anil sidhu"
}

console.log(typeof data);


null.js

"use strict";
var data = null;
var userName = null;
var login = true;
if (login) {
userName = "Anil sidhu";
}
console.log(typeof data);