Web Reference: useCallback is a React Hook that lets you cache a function definition between re-renders. React Compiler automatically memoizes values and functions, reducing the need for manual useCallback calls. You can use the compiler to handle memoization automatically. Jan 22, 2026 · The useCallback Hook memoizes a function so it is not recreated on every render. It improves performance when passing callbacks to child components. Returns the same function reference until dependencies change. Helps prevent unnecessary re-renders. Useful when working with memoized child components. Syntax: const memoizedCallback = useCallback Aug 17, 2025 · Think of useCallback like giving React a permanent phone number for your function. Without it, you’d be giving out a new number every time you spoke — and your friends (child components) would think they have to reintroduce themselves.
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