Library

Browse everything in the app — no quiz, just reference. Look up a pattern before drilling it, or review a tradeoff cold.

⌘K

All 22 patterns with templates and the problems that use them.

31 concepts and 10 canonical prompts.

Pick A or B for each scenario one at a time, then see the canonical answer.

Read a snippet, name its time and space — one at a time.

Complexity classes, data-structure ops, canonical algorithms — everything in one cheat sheet.

One scenario at a time — pick which production idiom applies (backoff, bloom, leases…).

One STAR prompt at a time — formulate your answer, then check the rubric.