Interactive JavaScript Learning

Your local brain,
forked to the web

No courses. No paywalls. Animated, real-world examples for every JavaScript concept — growing one module at a time.

Start with Arrays → View on GitHub
118+
methods covered
20
real-world scenarios
4
modules live
fork-my-brain ~ js
All modules

Pick a topic, start learning

📦
Live
Array Methods
41 methods. Animated scenarios: shopping cart, playlist, delivery queue.
pushmapfilterreducefind
41 methods · 5 scenarios→
🔤
Live
String Methods
32 methods. Form validation, URL slugs, receipts, search & highlight.
trimreplacesplitincludespadStart
32 methods · 5 scenarios→
🔁
Live
Promises & Async
Promise lifecycle, async/await, concurrency, real API calls.
asyncawaitPromise.allfetch
15 methods · 5 scenarios→
🌐
Live
DOM Manipulation
querySelector, events, classList — live page previews.
querySelectoraddEventListenerclassList
30+ methods · 5 scenarios→
🗺️
Planned
Map & Set
Deduplication, lookups, and fast existence checks.
Map.setSet.hasMap.entries
Planned→
🔢
Planned
Object Methods
keys, values, entries, assign, freeze — data transformations.
Object.keysObject.assignspread
Planned→
Roadmap

What's next

Array Methods
String Methods
Promises & Async
DOM Manipulation
Map & Set
Object Methods
Regex
Destructuring
Error Handling
Closures & Scope