Topic 1: Data Types in JS

Install VS code and node.js in your PC and connect VS code to node.js then type the code in VS code and run in its terminal. 

 

//Revision Lecture 1: 24 Sep 2022

//Topic 1: //* Data Types in JS *//

//1) string

//2) number

//3) boolean

//4) undefined

//5) NaN

//6) object

//7) array

//1) String: everything written in single or double quotes is a string

let a = 'Tuljabhavani';

let a2 = "Tuljapur";

let a3 ='500';

console.log(typeof(a)) // result--> string

console.log(typeof(a2)) // result--> string

console.log(typeof(a3)) // result--> string

//in JS string + number is considered as a string

let b = "Amol" + 10

console.log(typeof(b)) // result--> string

console.log(b) // result--> Amol10

//if arithmetic operations with numbers are after string then it will not perform that operations

let b2 = "Amol" + 10 + 5

console.log(b2) // result--> Amol105

//if arithmetic operations with numbers are before string then it will perform that operations

let b3 = 10 + 5 + "Amol"

console.log(b3) // result--> 15Amol

//2) Number: any +ve, -ve number, number with decimals

let a4 = 50;

let a5 = 50.7;

let a6 = 200/100

console.log(typeof(a4)) // result--> number

console.log(typeof(a5)) // result--> number

console.log(typeof(a6)) // result--> number

//3) Boolean: boolean has only two values - true or false

let a7 = true;

let a8 = false;

let a9 = 5 > 4

console.log(typeof(a7)) // result--> boolean

console.log(typeof(a8)) // result--> boolean

console.log(typeof(a9)) // // result--> boolean

//4) undefined: any variable whose value is not defined

let a10;

console.log(typeof(a10)) // result--> undefined

//5) NaN: when result of arithmetic operation can't be expressed then output is NaN (Not-a-Number)

let a11 = 12/"solapur"

console.log(a11) // result--> NaN

//6) Object: objects are written with curley braces

let a12 = {FirstName: 'jivan'}

console.log(typeof a12) // result--> object

//7) Array: arrays are written with square brackets

//the type of array is also a object because everything in JS is an object

let a13 = ['amol', 'Jayesh']

console.log(typeof(a13)) // result--> object

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