Agents and Tool Calling: What Could Go Wrong?
Forty-two questions on how tool-using agents break. Covers schema and description design, the agent loop and when it stops, parallel versus sequential calls, idempotency under...
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Algorithms You Already Ship: A Frontend Engineer's Guide to Sorting, Windows, DP, Edit Distance & CSS Internals
A 50-question deep dive built to help frontend engineers better understand algorithms by grounding every concept in code you already write. Five techniques you already ship...
Auth & Sessions at Scale
Authentication is where security and system design collide. This quiz contrasts stateful sessions with stateless JWTs, then digs into the consequences: where to store tokens...
Behavioral Economics: Loss Aversion, the Decoy Effect, and the Power of Free
Forty questions on the most famous findings in behavioral economics — why losses hurt about twice as much as equivalent gains, how a useless third option (the decoy) can flip...
Big Numbers in the Economy: Estimate GDP, Inflation Math, and Compound Interest
Sixty-three questions that turn the economy's most quoted numbers into math you can actually do in your head. Three pillars: estimating GDP (the C + I + G + (X − M) identity,...
Big-O You Can Feel: Complexity Through Re-renders and DOM Work
Algorithms for frontend engineers — taught entirely through the costs you actually pay in the browser, so you feel asymptotic complexity instead of memorizing it. Three...
What the Cache Forgets: LRU & Eviction in SWR/React Query
You reach for TanStack Query and SWR every day — but do you know when they evict, and why a hand-rolled memo Map quietly leaks memory? Trace LRU eviction (hash map + doubly...
Caching at Every Layer
Follow one request from the browser outward through every cache it can hit — the HTTP cache (Cache-Control, ETag, Last-Modified, revalidation), the CDN edge, the client query...
Can You Catch the AI's Bug?
Review plausible AI-generated TypeScript, React, browser, Node.js, and SQL code. Catch race conditions, security mistakes, invented APIs, and assumptions that look reasonable...
Color on the Web: Gamut, Gamma & Why Your Gradient Goes Gray
#808080 is not half as bright as white, a 50%-lightness yellow and a 50%-lightness blue are nothing alike, and a blue-to-yellow gradient turns gray in the middle for a reason....
Compression: What Actually Shrinks
Compression is the cheapest performance win on the web and the one most often applied to the wrong bytes. This Quiz covers what makes data compressible, how Huffman and LZ77...
Copyright & Licenses for People Who Ship Code
What MIT's one condition actually obliges you to do, why Apache-2.0's patent grant is the reason big companies prefer it, what really triggers AGPL section 13, and why "no...