A focused 7-day path on React hook mechanics, effect lifecycle, stale closures, dependencies, cleanup ownership, and performance trade-offs. Built for interview-ready reasoning, not memorized rules.
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Hooks are indexed by call order. Top-level calls preserve state identity across renders.
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Effects model external synchronization. Cleanup defines ownership of subscriptions, timers, and listeners.
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The bug is rarely "effect ran". The bug is stale data captured by the effect callback.
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Custom hooks reuse stateful behavior. They do not share state unless you intentionally share a store.
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Rate-limiting hooks reduce unnecessary work. Traffic light teaches effect-driven state machines.
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Re-renders are not the bug. Unnecessary work is. Memoization adds cognitive cost, so apply it where profiling proves value.
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Pro-only capstone drills focused on timer ownership, cancellation, and cleanup semantics.