---
title: "Discussion on \"Difference Between undeclared, undefined, and null\" | Hashnode"
description: "Discussion on \"Difference Between undeclared, undefined, and null\". \"Undeclared\" means the variable has not been declared or defined in the current scope.\n\n\"Undefined\" means the variable has been declared but not assigned a"
url: "https://hashnode.com/posts/difference-between-undeclared-undefined-and-null/6513b5bb391f8b377b631c4c"
---

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# [Difference Between undeclared, undefined, and null](https://xdev.hashnode.dev/difference-between-undeclared-undefined-and-null?utm_source=hashnode&utm_medium=feed)

"Undeclared" means the variable has not been declared or defined in the current scope. "Undefined" means the variable has been declared but not assigned a

Sep 27, 2023 · 1 min read · xdev.hashnode.dev  
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-   [#undefined](https://hashnode.com/tag/undefined)
-   [#null](https://hashnode.com/tag/null)
-   [#javascript](https://hashnode.com/tag/javascript)
-   [#difference](https://hashnode.com/tag/difference)
-   [#interview](https://hashnode.com/tag/interview)

## Written by

[Madhusudan Das](https://hashnode.com/@XDEV200)

@XDEV200 · Jamshedpur

  
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👋 I'm a Jamshedpur native with a deep passion for entrepreneurship and web development. Armed with expertise in HTML, CSS, JavaScript, Node.js, and React, I specialize in crafting high-performance web applications that seamlessly blend design and technology. 🚀 One of my most significant accomplishments includes co-founding a startup and managing it for a successful three-year run. In just nine months, I took the product from inception to a thriving ecosystem with 25+ merchants and a loyal customer base of 1500+. 🌟 I have over five years of frontend development experience and a passion for pushing the boundaries of web design with React.js. Beyond coding, you'll find me engaged in ♟️ chess battles, 🎬 movies, and grooving 🎵 to music with friends. I'm a detail-oriented computer science engineer committed to excellence in every project. Let's create something extraordinary together!

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