Master JavaScript.
One quest at a time.
From your first const to building React from scratch. Interactive lessons, real coding challenges, AI tutoring, and gamified streaks that actually make it stick.
01// Day 23 · Closures Quest 🔒02function createCounter() {03 let count = 0;04 return () => ++count;05}0607const next = createCounter();08next(); // +10 XP 🔥
Everything you need to actually ship code.
Tutorials don't make engineers. Reps do. We built every system around getting you to write code, today.
AI Tutor
Stuck on closures? Ask anything. Get beginner + advanced explanations, real-world analogies, and runnable code.
In-browser editor
Monaco-powered playground with auto-complete, error highlighting, and instant console output.
Gamified XP
Streaks, levels, coins and badges. Compete on weekly leaderboards. Learning that feels like a game.
Structured roadmap
Beginner → Intermediate → Advanced. Variables to building your own React. Nothing skipped.
1,200+ challenges
From easy loops to polyfills and event-loop puzzles. Hidden test cases. Instant feedback.
Visual explanations
Animated diagrams for execution context, the event loop, prototype chains, and the call stack.
Real projects
Calculator, weather app, expense tracker, kanban board, full ecommerce. Ship a portfolio.
Interview ready
100+ JS interview questions, machine coding rounds, timed MCQs, and mock interviews.
Zero to JavaScript engineer.
Three tracks, 201 lessons, 18 weeks. Every concept paired with reps.
Beginner
- Variables & types
- Operators & conditions
- Loops & functions
- Arrays & objects
- Scope basics
Intermediate
- Closures & hoisting
- Event loop & promises
- Async / await
- DOM & browser APIs
- Build: Weather app
Advanced
- Prototypes & OOP
- Currying, memo, debounce
- Build your own React
- System design
- Interview rounds
Learning that's actually addictive.
Streaks. XP. Coins. Badges. Leaderboards. Every lesson rewards your brain — so showing up tomorrow feels easier than skipping.