Ever seen NaN in your JavaScript output and wondered what it means? In this beginner-friendly tutorial, you’ll learn what NaN (Not-a-Number) is in JavaScript, why it appears, and how to properly detect, handle, and avoid it in your code.

NaN can occur during invalid number operations and is often a sign of hidden bugs. Learn how to debug and fix NaN values using the right methods and best practices.

In this video, you’ll learn:

What is NaN in JavaScript?

Common situations that cause NaN (e.g. math with non-numeric values)

How to check for NaN using isNaN() and Number.isNaN()

The difference between ==, ===, and NaN comparisons

Real-world examples and prevention tips

Perfect for JavaScript beginners, students, or anyone working on form inputs, data validation, calculations, or number conversion.

Watch more useful videos in our JavaScript Tutorials Playlist to strengthen your fundamentals!

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