JavaScript

Lesson in the Data Structures & Algorithms Roadmap · Stage 1: Pick a Language

Last updated 14 September 2026

What is JavaScript?

JavaScript allows you to add interactivity to your pages. Common examples that you may have seen on the websites are sliders, click interactions, popups and so on. Apart from being used on the frontend in browsers, there is Node.js which is an open-source, cross-platform, back-end JavaScript runtime environment that runs on the V8 engine and executes JavaScript code outside a web browser.

Study this in the interactive course See the whole Data Structures & Algorithms roadmap

Free resources to learn JavaScript

RoadmapVisit Dedicated JavaScript Roadmap
ArticleThe Modern JavaScript Tutorial
ArticleOfficial Documentation
VideoJavaScript Crash Course for Beginners
VideoNode.js Crash Course
VideoNode.js Tutorial for Beginners
FeedExplore top posts about JavaScript

JavaScript: common questions

Can I learn JavaScript in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain JavaScript in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this JavaScript tutorial for beginners?

It is lesson 3 of 107 in the free Data Structures & Algorithms roadmap, in stage 1, Pick a Language. If you are new to Data Structures & Algorithms, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.