Day80.js

*****************Variable**********************

let firstName = 'Rajeev Ranjan';
let lastName = "Yadav"
console.log(firstName+" "+lastName);

****************notes about Variable***********

1) can't be a reserved Keyword
2) Should be meaningful
3) can't start with a number
4) can't contain a space or hyphen
5) Are case sensitive

********************Constants******************

const intersetRate = 10.3;
console.log(intersetRate);

-> used for constant data once decleared can't change


*********************Primitive Types******************

let name = 'Rajeev';
let age = 35
let isApproved = false;
let firstName = undefined;
let selectColor = null;

console.log(name+" "+age+" "+isApproved+" "+firstName+" "+selectColor);

let name = 'Raje';
undefined
typeof name;
"string"
let age = 20;
undefined

>>>>>>>>>Primitive / value Type >>>>>>>>>>>>>>>>>

string 
number
Boolean
null
undefined