Variables in JavaScript

UpdatedJuly 11, 2025

Full stack engineer but passionnated by front-end Angular Expert / NX / JavaScript / Node / Redux State management / Rxjs

Part of seriesJavaScript

Variables

In JavaScript likes others languages we are using variables ! 😱

They are containers for storing data values, in this article I will just explain how to use them, because the entire subject is a little bit hard, and at the beginning you don't need to know everything to start using them.

Examples

carbon (3).png

If you want to know the difference between let and var I can recommend this fantastic article by Flavio Copes : Click me

In all cases you should try it ! It's very simple but it's a must in every language 🤘

🚀 In my next post you can learn what is undefined in JavaScript 🚀

#javascript #beginners #js #web-development #frontend-development

Comments

Join the discussion

No comments yet. Be the first to comment.

JavaScript

Part 3 of 5

Up next

Hello World in JS !

Hello World As usual the first thing to do when you are beginning a new language : Hello World ! Why Hello World ? 😉 In JS they are multiple different ways to do that : Using alert box Using the console Modifying the DOM ... I coded for you few e...

More from this blog

State management architecture in Nx

A structured approach to Angular applications with Ngrx Signal Store

Aug 16, 20254 min read

Understanding useEffect: No dependencies vs empty array vs dependencies array

The useEffect hook is fundamental to React functional components, but its behaviour changes dramatically based on how you handle the dependencies array. Let's explore the three main patterns and when to use each one. useEffect without dependencies ar...

Aug 12, 20255 min read

Understanding useEffect: No dependencies vs empty array vs dependencies array

Git Worktree : Managing multiple branches simultaneously

Git worktree is a Git feature that allows you to check out multiple branches at once in different directories, without cloning the repository again. This powerful capability transforms how developers handle parallel development workflows. The Problem...

Aug 8, 20254 min read

Git Worktree : Managing multiple branches simultaneously

Git push force vs force-with-lease: When and Why to use each

When working with Git in collaborative environments, you'll inevitably encounter situations where you need to overwrite remote history. Two commands come into play: git push --force and git push --force-with-lease. Understanding the difference betwee...

Aug 4, 20254 min read

Git push force vs force-with-lease: When and Why to use each

TypeScript's [number] Index Signature: Extract Union Types from Arrays

Ever needed to create a union type from an array of objects in TypeScript? There's an elegant solution using the [number] index signature notation that can save you from maintaining duplicate type definitions. The Problem Let's say you have an array ...

Jul 19, 20253 min read

TypeScript's [number] Index Signature: Extract Union Types from Arrays

Gilles Ferrand's Blog

18 posts

Lead Developer Front-end - Enthusiast Developer - NX & Angular Lover