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. 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. Mar 7, 2019 · The example below demonstrates the differences between useCallback and useMemo and the consequences of not using them. In this example I am using React.memo to prevent Child from re-rendering unless its props or state change.
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