useCallback Hook
useCallback(fn, deps) is useMemo for a function value: it returns the same function reference until a dependency changes, so memoized children (React.memo) and dependency arrays that receive the callback don't invalidate on every render. Since every render creates fresh function objects, referential identity — not the code inside — is what it stabilizes.
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useCallback(fn, deps) is useMemo for a function value: it returns the same function reference until a dependency changes, so memoized children (React.memo) and dependency arrays that receive the callback don't invalidate on every render. Since every render creates fresh function objects, referential identity — not the code inside — is what it stabilizes.
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