Answer
Async tasks may update unmounted components. Use AbortController, cleanup functions, or transitions.
Quick Answer
Memory leaks happen when async operations (fetch, setInterval, subscriptions) complete after the component unmounts and try to update state — React warns about this. Fix: return a cleanup function from useEffect that cancels the operation (AbortController for fetch, clearInterval, unsubscribe). Always clean up async side effects.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ