---
title: "Discussion on \"NaN (Not a Number) in JavaScript — in plain words\" | Hashnode"
description: "Discussion on \"NaN (Not a Number) in JavaScript — in plain words\". Learn what NaN (“Not a Number”) means in JavaScript, how it behaves in comparisons and math operations, and how to handle it safely in your code."
url: "https://hashnode.com/posts/nan-in-javascript/68fefa2ca6d32a2d533a0bcb"
---

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# [NaN (Not a Number) in JavaScript — in plain words](https://stackedinsights.hashnode.dev/nan-in-javascript?utm_source=hashnode&utm_medium=feed)

Learn what NaN (“Not a Number”) means in JavaScript, how it behaves in comparisons and math operations, and how to handle it safely in your code.

Oct 27, 2025 · 2 min read · stackedinsights.hashnode.dev  
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-   [#javascript](https://hashnode.com/tag/javascript)
-   [#nan](https://hashnode.com/tag/nan)
-   [#type-conversion](https://hashnode.com/tag/type-conversion)
-   [#learn-javascript-basics](https://hashnode.com/tag/learn-javascript-basics)
-   [#programming-concepts](https://hashnode.com/tag/programming-concepts)

## Written by

[Aashish Shrestha](https://hashnode.com/@beingaashr)

@beingaashr · Dharan, Nepal 🇳🇵

  
[View profile](https://hashnode.com/@beingaashr)

Notes from a developer who overthinks semicolons.

Hi, I’m Aashish, a developer who documents his confusion so others can skip it. Most of what I write starts as a messy Notion page, but ends up as something other devs can actually use. Currently obsessed with integrating Typescript/React/Next with Laravel and making code readable enough that future me won’t file a bug report. Occasionally seen holding a guitar and pretending it’s therapy.

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