---
title: "What is the use of isNaN function?"  
description: "What is the use of isNaN function?"  
author: "Anonymous User"  
published: 2015-01-28  
updated: 2020-09-19  
canonical: https://www.mindstick.com/interview/2315/what-is-the-use-of-isnan-function  
category: "javascript"  
tags: ["jquery"]  
reading_time: 1 minute  

---

# What is the use of isNaN function?

isNan function returns true if the argument is not a number otherwise it is false.

## Answers

### Answer by prateek jain

The IsNaN () function determines whether the value is an invalid number (not-a-number). If the value is equal to NaN, then this function is correct. Otherwise it is unreal. This function number is different from the specific number.isNaN () method.

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### Answer by Anonymous User

isNan function returns true if the argument is not a number otherwise it is false.


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