Answer
Use useCallback when passing functions to memoized children or using them in dependency arrays. Otherwise, it adds unnecessary overhead.
Quick Answer
Use useCallback when a function is passed as a prop to a memoized child (React.memo) — without it, the child gets a new function reference each render and re-renders anyway. Don't use useCallback for every function — the memoization itself has a cost. Only apply it where referential stability actually prevents a re-render you care about.
S
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