Web Reference: Jul 5, 2019 · Both useCallback() and useMemo() provide return values that can be used immediately, while useEffect() does not because its code does not run until much later, after the render has completed. Jul 23, 2021 · The useCallback hook is used to memoize the functions to prevent unnecessary re-renders, while useMemo is used to memoize the computed outputs, and useEffect performs sideEffects in a React application. Mar 11, 2026 · Fix unnecessary React re-renders: master useCallback, useMemo, React.memo, and the new React 19 use () hook with real-world patterns, profiling tips, and pitfalls to avoid.
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