What are common failure modes of memo, useMemo, useCallback?

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Quick interview answer

Common failures around memo, useMemo, useCallback: blocking the hot path, ignoring backpressure, and weak timeout/retry design. Memoizing everything; useCallback with empty deps capturing changing state.

Detailed answer

Failure modes for memo, useMemo, useCallback: Known pitfalls: Memoizing everything; useCallback with empty deps capturing changing state. • Missing timeouts / unbounded retries • No backpressure when downstream slows • Assuming ordering/guarantees the runtime does not provide How seniors prevent them: Profile first; memo leaf components receiving stable props from unstable parents. Parent context: Logic: React.memo skips re-render if props shallow-equal. useMemo caches computed value; useCallback caches function reference — helps memoized children avoid redundant renders.

Full explanation

Name concrete failure modes and the mitigation for each — that scores higher than a vague “it can fail.” React.memo skips re-render if props shallow-equal. useMemo caches computed value; useCallback caches function reference — helps memoized children avoid redundant renders.

Follow-up questions

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Parent context — memo, useMemo, useCallback

Logic: React.memo skips re-render if props shallow-equal. useMemo caches computed value; useCallback caches function reference — helps memoized children avoid redundant renders.

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