The Number isNaN() method
Find out all about the JavaScript isNaN() method of the Number object
NaN is a special case. A number is NaN only if it’s NaN or if it’s a division of 0 by 0 expression, which returns NaN. In all the other cases, we can pass it what we want but it will return false:
Number.isNaN(NaN) //true
Number.isNaN(0 / 0) //true
Number.isNaN(1) //false
Number.isNaN('Flavio') //false
Number.isNaN(true) //false
Number.isNaN({}) //false
Number.isNaN([1, 2, 3]) //false
→ Get my JavaScript Beginner's Handbook
→ I wrote 17 books to help you become a better developer:
- C Handbook
- Command Line Handbook
- CSS Handbook
- Express Handbook
- Git Cheat Sheet
- Go Handbook
- HTML Handbook
- JS Handbook
- Laravel Handbook
- Next.js Handbook
- Node.js Handbook
- PHP Handbook
- Python Handbook
- React Handbook
- SQL Handbook
- Svelte Handbook
- Swift Handbook
Also, JOIN MY CODING BOOTCAMP, an amazing cohort course that will be a huge step up in your coding career - covering React, Next.js - next edition February 2025