JAVASCRIPT

• can change type of data at runtime , dynamically typed language What is Programming: a way to communicate with computer , telling computer what to do

LET'S GET STARTED :

• ECMA Script : standard of js , to add any feature in js we add in ECMA
• execute :: in browser
• at run time : node.js outside the browser
• inside html document using script tag
• REPLIT : a platfrom to run js

Variables

• containers to store different types of data

Rules :

• variable starts with $, _ , letters
• case sensitive language
• let,var,const used to declare variables
• let a= 67
• var: pre es6 var intoduces bug in the code
• const :constants let : block scoped variable

 let a= 67
console.log(a)

PRIMITVE AND NON PRIMITIVE DATA TYPES :

NN BB SS U

let e = null;
let f = 456;
let u = true ;
let g = BigInt("5");
let v = "harry "
let k = Symbol("thi is a symbol")
let y = undefined;
console.log(typeof(g))

null explicitly has nothing in it.

undeefined : kuch ditta hini or (let g ALONE )

OBJECTS: KEY VALUE PAIRS

const items={
  "harry" : true,
  "rohan": false,

}
console.log(items.harry)