data type.js

// Primitive datatype

let str="javascript";
console.log(str,typeof(str));  // string
let num=25;
console.log(num,typeof(num));  //num
let numnum=23.456;
console.log(numnum,typeof(numnum)); // num
let a= null;
console.log(a,typeof(a));  // object
let b;
console.log(b,typeof(b));   //undefined
let bool=true;
console.log(bool,typeof(bool));   // boolean
let BigInt=12233333n;
console.log(BigInt,typeof(BigInt));  //bigint

// nonprimitive data type
// array

let arr=["one",2,"five",6]  // declare array by list 
console.log(arr,typeof(arr));
console.log(arr[2]);  // index ref we call by index 2
arr[2]="sixty";  // reassign
console.log(arr);

// object  == key and values pair  //look like json format
 let obj=
 {
    name:"reena", role:"qa"  // syntax 
 }

console.log(obj,typeof(obj));
console.log(obj.name);  //ref we call by obj.ref 
obj.name="poori"; // reassign from reena to poori
console.log(obj);

// functions -- block of code reuse
 
function Demo()
 {
    console.log("hello");  // syntax
    
 }
Demo()  // calling func by function name
// dymanic calling of function