---
title: "What does isNaN function do?"  
description: "What does isNaN function do?"  
author: "Anonymous User"  
published: 2011-11-04  
updated: 2020-09-15  
canonical: https://www.mindstick.com/interview/1335/what-does-isnan-function-do  
category: "javascript"  
tags: ["javascript"]  
reading_time: 1 minute  

---

# What does isNaN function do?

Return true if the argument is not a number.

## Answers

### Answer by Anonymous User

Return true if the argument is not a number.


---

Original Source: https://www.mindstick.com/interview/1335/what-does-isnan-function-do

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