Learn JavaScript from scratch — the language of the web, hands-on
A hands-on JavaScript course for complete beginners. You write real JavaScript in the browser and a real judge runs it — no editor to configure, no boilerplate. Short interactive lessons teach each idea; coding challenges lock it in. You finish fluent in the language that runs every website and much of the modern back-end.
// your first program
console.log('Hello, JavaScript!');
for (let i = 1; i <= 5; i++) {
console.log(`${i} squared is ${i * i}`);
}Why learn JavaScript here
The one language of the web
JavaScript runs in every browser and, through Node, on the server too. Learn it once and you can build front-ends, back-ends and tools — no other language reaches as far.
Immediate feedback, no setup
Every lesson ends in a live editor; your code runs on Node against hidden tests the instant you submit. You see it work — you do not take a video’s word for it.
The good parts, and the sharp ones
let vs var, Map and Set over plain objects, why numbers are doubles, how sort really behaves. The course teaches the modern idioms and quietly steers you around the classic traps.
The syllabus — 8 chapters, in order
Each chapter is a set of short interactive lessons, then coding challenges you submit to a real judge before moving on.
- 01Getting Started
- 02Decisions & Loops
- 03Arrays
- 04Functions & Sorting
- 05Working with Text
- 06Objects & Collections
- 07Classes & Objects
- 08Real-World JavaScript
What you can do by the end
- Read and write modern JavaScript — let/const, template strings, console output
- Control flow with if/else, for and while loops
- Work with arrays and their methods (map, filter, reduce)
- Write functions and sort with a comparator
- Use objects, Map and Set the right way
- Model things with classes, and structure real programs
How the course works
Read a short lesson
One idea at a time, written for a beginner — with worked examples and quick-check questions, not a video to scrub through.
Write real JavaScript
Every lesson ends in an in-browser editor. Nothing to install — you write JavaScript and press run.
A real judge checks it
Your code is compiled and run against hidden tests, so you know it actually works instead of guessing.
JavaScript from scratch — questions people ask
How do I learn JavaScript from scratch?
Start with the fundamentals — output, variables, loops — and write code at every step, then build up to arrays, functions, objects and classes. That is exactly this course: eight chapters of interactive lessons and coding challenges, each run on Node by a real judge.
Is this JavaScript course free?
You can start for free with no card. A free account opens the interactive workspace and the first lessons; one membership then unlocks the whole JavaScript course plus the Python, Java and C++ courses and the full DSA course.
Do I need to know HTML or CSS first?
No. This course is about the JavaScript language itself — the logic — so it stands on its own. HTML and CSS are easy to add on top once you can program.
Is it Node or browser JavaScript?
The judge runs Node, and the code is plain JavaScript with no DOM, so everything you learn works in the browser and on the server alike.
Is JavaScript good for coding interviews?
Yes — it is widely accepted. After this course, the Data Structures & Algorithms course (also taught in JavaScript) is included in the same membership and prepares you for interviews.
Will I get a certificate?
Yes. Finishing the course issues a certificate with a public verification link an employer can check.
Also included in your membership
One membership unlocks every course — switch between them whenever you like. Nothing here is sold separately.
Start JavaScript today — free
A free account opens the workspace and the first lessons, no card. One membership then unlocks this course and every other — $49 a year (international price; the price for your region is shown at checkout).