Web Reference: useMemo is a React Hook that lets you cache the result of a calculation between re-renders. React Compiler automatically memoizes values and functions, reducing the need for manual useMemo calls. You can use the compiler to handle memoization automatically. Call useMemo at the top level of your component to cache a calculation between re-renders: The useMemo Hook can be used to keep expensive, resource intensive functions from needlessly running. In this example, we have an expensive function that runs on every render. Jul 23, 2025 · React provides a powerful tool for optimizing performance, the useMemo() hook. In this article, we'll delve into how useMemo() works, its benefits, and practical examples of how to manipulate it effectively in your React applications.
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