---
title: "Discussion on \"When Calling Functions Goes Wrong: Unpacking the 'z is not defined' Error in JavaScript\" | Hashnode"
description: "Discussion on \"When Calling Functions Goes Wrong: Unpacking the 'z is not defined' Error in JavaScript\". Understanding parameters and arguments in JavaScript"
url: "https://hashnode.com/posts/when-calling-functions-goes-wrong-unpacking-the-z-is-not-defined-error-in-javascript/66f9697a101a6c9c94ab6e49"
---

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# [When Calling Functions Goes Wrong: Unpacking the 'z is not defined' Error in JavaScript](https://pradeepwrites.hashnode.dev/when-calling-functions-goes-wrong-unpacking-the-z-is-not-defined-error-in-javascript?utm_source=hashnode&utm_medium=feed)

Understanding parameters and arguments in JavaScript

Sep 29, 2024 · 3 min read · pradeepwrites.hashnode.dev  
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-   [#javascript](https://hashnode.com/tag/javascript)
-   [#arguments](https://hashnode.com/tag/arguments)
-   [#parameters](https://hashnode.com/tag/parameters)
-   [#error-handling](https://hashnode.com/tag/error-handling)
-   [#debugging](https://hashnode.com/tag/debugging)
-   [#programming-concepts](https://hashnode.com/tag/programming-concepts)

## Written by

[Pradeep Thapa](https://hashnode.com/@PradeepOct)

@PradeepOct · India

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

Coding with purpose, creating with passion

Hi, I'm Pradeep Thapa, a web developer with a passion for frontend design and digital solutions. With a background in teaching and a love for continuous learning, I specialize in React, JavaScript, HTML, CSS, and Tailwind CSS. Always eager to grow, I enjoy turning ideas into functional, user-friendly web experiences.

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