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โ‡ฑ How To Define Functions in JavaScript | DigitalOcean


How To Define Functions in JavaScript

Updated on August 26, 2021
๐Ÿ‘ How To Define Functions in JavaScript

Introduction

A function is a block of code that performs an action or returns a value. Functions are custom code defined by programmers that are reusable, and can therefore make your programs more modular and efficient.

In this tutorial, we will learn several ways to define a function, call a function, and use function parameters in JavaScript.

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Tutorial Series: How To Code in JavaScript

JavaScript is a high-level, object-based, dynamic scripting language popular as a tool for making webpages interactive.

About the author(s)

Software engineer and open source creator

Community and Developer Education expert. Former Senior Manager, Community at DigitalOcean. Focused on topics including Ubuntu 22.04, Ubuntu 20.04, Python, Django, and more.

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Its a very concise and clear explanation of javascript function and its evolution. Thank you.

Excellent, it is clear that anyone can understand it, I appreciate very much your effort, thank you.

Hello everyone i need an assist on something in javascript please, the issue at hand is take for instance a php website with multiple pages, were the header and footer is in different files using php include statement to include the header and footer i. e <?php include โ€œheaderโ€ ; ?> And an external javascript file linked in the header or footer. I. e for instance <javascript src=โ€œmm.Jsโ€> And a button located in the header page, since the header is included in all pages, that makes the one button appear in all pages, the button is to trigger a javascript function inside the linked javascript file for instance a function to alert "hello world ", now when the button is clicked on the index page it triggers the function but when the same button is clicked in the other pages the function Will not be triggeredโ€ฆ

it is very nice to understand and easy to use the given and work with it .

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