Learn JavaScript - JS Course

Learn Simpli

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About this app

Learn JavaScript the smart way — from your very first line of code to advanced interview-level concepts. This comprehensive JavaScript programming app pairs a structured web development curriculum with an interactive JS code editor simulator, 840+ grammar quizzes, and 190+ coding problems solved completely in JavaScript.

Everything works 100% offline. No login, no sign-up, and no account required to start learning coding.

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WHAT YOU'LL LEARN
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• 435 lessons across 39 chapters — foundational basics to advanced web programming
• Modern JavaScript (ES6+): let/const, arrow functions, destructuring, spread/rest, modules
• Asynchronous JS: callbacks, promises, async/await, the event loop mechanics
• Document Object Model (The DOM): selecting, manipulating, and handling events
• Closures, lexical scope, hoisting, and the "this" keyword
• Data Structures: Arrays, objects, strings, maps, sets, and typed arrays
• Prototypes, classes, and Object-Oriented JavaScript (OOP)
• Error handling, custom errors, exceptions, and code debugging
• Essential design patterns in JavaScript
• Under the hood: how the V8 engine and JS runtime environment work

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FEATURES
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📘 Structured Lessons — every topic broken into Theory & Fundamentals, Core Mechanics, Best Practices & Pitfalls, and a Quick Summary.
🖼️ Visual Diagrams — clear SVG illustrations that make tricky asynchronous concepts click instantly.
💻 Real Code Examples — syntax-highlighted snippets you can read and copy for practical practice.
🧠 840+ Quiz Questions — across 28 topics with detailed logical answer explanations.
🎯 190+ Interview Coding Problems — Numbers, Strings, Arrays, Stacks, Trees, Linked Lists, Queues, Matrices, and logic pattern printing — each with an optimized JavaScript solution.
🏢 Company-style placement questions (Google, Amazon, Microsoft, and Oracle coding patterns).
📶 Fully Offline App — learn anywhere, no active internet or mobile data needed after installation.
🌙 Clean, distraction-free reading engine with adaptive light and dark themes.
🔖 Bookmarks, reading progress tracking, and daily study streaks.

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PERFECT FOR
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• Complete beginners learning to code and build websites for the first time.
• Computer science students preparing for engineering exams and university assignments.
• Front-end and full-stack developers preparing for technical coding interviews and campus placement drives.
• Anyone who wants a solid, practical JavaScript programming foundation.

Learn JavaScript at your own pace and build a strong, practical foundation — one chapter at a time. Start learning today!

What’s new

🎯 190+ interview coding problems, each with a JavaScript solution
🖼️ New visual diagrams across lessons to explain concepts faster
📘 Redesigned lessons — Theory, Core Mechanics, Pitfalls & Quick Summary
🧠 840+ quiz questions with answer explanations
🔓 First few problems now free to try
✨ Cleaner reading experience and tighter layouts