How do you make memo, useMemo, useCallback safer under partial failure?

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Quick interview answer

Harden memo, useMemo, useCallback with timeouts, retries with jitter, isolation, and graceful degradation. Logic: React.memo skips re-render if props shallow-equal. useMemo caches computed value; useCallback caches function reference — helps memoized children avoid redundant renders.

Detailed answer

Resilience for memo, useMemo, useCallback under partial failure: • Timeouts + budgets on every dependency call • Retries only when idempotent, with jitter/backoff • Isolation: bulkheads/queues so one failure does not cascade • Degradation: serve stale/cached/limited mode when needed Practices: 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

Partial failure is the default in distributed systems — show how memo, useMemo, useCallback stays useful anyway. 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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