Mid-levelMid (3–6 yrs)ReactNext.jsAngularMetaAirbnbUber
useEffect pitfalls
What are common useEffect bugs in production React apps?
Answers use simple, clear English.
Quick interview answer
Missing cleanup (subscriptions/timers), stale closures, fetching without abort, syncing derived state instead of computing during render, and using effects for events that should be handlers. Prefer React Query/SWR for server state.
Detailed answer
Missing cleanup (subscriptions/timers), stale closures, fetching without abort, syncing derived state instead of computing during render, and using effects for events that should be handlers. Prefer React Query/SWR for server state.
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