Data Structures & Algo in JS

Learn Data Structures & Algorithms in JavaScript, one problem at a time.

Study the patterns tested in coding interviews, then apply them in the built-in JS runner.

📚 Structured DSA lessons
Work through arrays, strings, linked lists, stacks, queues, hashing and recursion before moving to trees, graphs, heaps, sorting and searching. Each subtopic gives theory, guided practice and a quick summary with runnable, syntax-highlighted code and plain-English explanations.

💻 Solve in JavaScript
Write and run solutions in the online code editor. Tackle problems with hidden test cases and reference answers, then let the AI check your output. The runner also supports Python, Java, C++, Go, TypeScript, Rust, Dart, Kotlin and Swift.

🧠 Algorithm techniques
Build real problem-solving skill with two-pointer, sliding window, binary search, greedy methods and dynamic programming. Every approach includes Big-O time and space complexity analysis so you choose the right trade-off.

📝 Quizzes & mock tests
Progress through Easy, Medium and Hard multiple-choice questions, each with an explanation. Take timed mock tests that blend theory, MCQs and coding, with result analytics and weak-topic flags. Revisit attempts anytime in your quiz history.

🤖 Smart Mentor AI tutor
Ask questions in plain language, get lesson-aware help, run a mock-interview mode, or snap a photo of code or a diagram. Generate a 7-day study plan covering concept review, coding practice and interview drills.

📊 Track your growth
Watch scores over time, study time and topics completed. Daily check-ins, revision cards, streaks and goals keep momentum, while leaderboards add friendly competition.

🌐 Built for everyone
Works offline, with light and dark themes and an interface in English, Hindi, Kannada, Tamil and Telugu that keeps code and technical terms intact.

Plans
Starter topics, daily practice and limited AI help are included. A subscription unlocks all topics, every difficulty, unlimited practice, custom topic tests, full history and higher AI limits. Available as a 6-month prepaid plan or an auto-renewing monthly plan, each with a trial period.

JavaScript and other language names and logos are trademarks of their respective owners. This app is independent and not affiliated with or endorsed by them.