ReactJS

 Prerequisite: 

1. NodeJs Required & NPM
2. Vs Code.

Vs Code extensions: 

1. Thunder Client: as a Postman
2.  ES7 React/Redux/GraphQL/React-Native snippets: It provides suggestion of codes.
3. Bracket Pair Colorizer: it uses for bracket open and close (colors as same).
4. Auto Rename Tag: It uses for tags(open and close).
5. Live Server: run perticular page
6. Prettier-Code formatter: 

How many way to creater Variable:

1. Var: older use

 Example: var a=55;

                 var a=45;

                   // Its valid variable declaration

2. Let: Morden use 

Example: Let a=55;

                Let a= 45;

// Its invalid variable declaration

3. Const: uses for constant something

Types of DataTypes:

1. Numbers

2. Objects

3. Booleans -> true or false

4. String

5. Undefined

6. null

Functions:

function hell(){

console.log('Hello world');

}

Objects:

let obj = {

r: 34,

m:65,

func: function myfunc(number){

console.log('Hello world'+ number);

}

}