From React Scheduler to Linux kernel — 46 patterns you can explore interactively, trace to real source code, and implement in 4 languages.
Every pattern has a hands-on SVG visualization. Click, drag, and experiment to build intuition — then undo any step, replay, or scrub through the algorithm's history with the time-travel playback bar.
Every pattern comes with precise GitHub source links (down to line numbers) proving it's used in real-world projects.
Idiomatic implementations in TypeScript, Rust, Go, and Python — not mechanical translations, but native expressions of each pattern.
Progressive exercises (basic → intermediate → advanced) with test suites you can run locally.
Each pattern includes 3-4 scenario-based "guess what happens" questions to test real understanding, not just reading.
See how React, Redis, Go runtime, Linux, PostgreSQL, and Kafka compose multiple patterns in production.
Every pattern page has a hands-on visualization like this one. Click Insert Random to watch the heap algorithm in action, or try the React Scheduler scenario. Use the playback bar below the visualization to undo any step, replay, or scrub through the algorithm's history:
80+ years of computing history. Click any card to explore the pattern. Browse by category → · Full timeline page →