Check if variable is a number in JavaScript

This tutorial explains how to check variable is a number in javascript. Lets see the below example, where we have used typeof operator and isNaN() function to verify the variable is number or not.

1. typeof – If variable is a number, it will returns a string named "number".
2. isNaN() – Stands for "is Not a Number", if variable is not a number, it return true, else return false.

Using typeof operator :

In this example, we have used typeof operator, and verifying the variable is number or not in javscript.

// In this variable we are storing number... 
var num1 = 758;

// verifying by using typeof operator
 if(typeof num1 == 'number'){
 console.log(num1 + " is a number.");
 }else{
 console.log(num1 + " is not a number.");
 }

Output :
-----------------------

> "758 is a number."

Using isNaN() function:

In this example, we have used isNaN() function, and verifying the variable is number or not in javascript.

// In this variable we are storing number...
var num1 = 536;

// verifying by using isNaN function operator
 if(isNaN(num1)){
 console.log(num1 + " is not a number.");
 }else{
 console.log(num1 + " is a number.");
 }

Output :
-----------------------

> "536 is a number."

This is all about Checking if variable is a number in JavaScript. Thank you for reading this article, and if you have any problem, have a another better useful solution about this article, please write message in the comment section.