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useMemo is a React Hook that lets you cache the result of a calculation between re-renders. const cachedValue = useMemo ( calculateValue , dependencies ) Reference
The React useMemo Hook returns a memoized value. Think of memoization as caching a value so that it does not need to be recalculated. The useMemo Hook only runs when one of its dependencies update. This can improve performance. The useMemo and useCallback Hooks are similar.
Feb 7, 2024 · useMemo stands out as a powerful tool for optimizing performance without sacrificing code readability or maintainability. But it's often overlooked or misunderstood by beginners. In this comprehensive guide, we'll discuss what useMemo is, how it works, and why it's an essential tool for every React developer. Table of Contents. What is useMemo?
Oct 10, 2024 · The useMemo Hook returns a memoized value and prevents the application from unnecessary re-renders. It is useful in heavy computations and processes when using functional components. The useMemo hook helps optimize performance by memoizing expensive calculations.
Feb 11, 2023 · useMemo() is a built-in React hook that accepts 2 arguments — a function compute that computes a result, and the depedencies array: const memoizedResult = useMemo(compute, dependencies); During initial rendering, useMemo(compute, dependencies) invokes compute, memoizes the calculation result, and returns it to the component.
Jul 18, 2021 · The useMemo() hook is used to apply the memoization technique to the function that you passed as its argument. Using the add() function as an example, the hook syntax is as follows: const firstNumber = 1; const secondNumber = 1; const num = useMemo(() => { add(firstNumber, secondNumber); }, [firstNumber, secondNumber]);
Sep 19, 2024 · React useMemo() hook is a function that caches the value produced from an expensive function used inside a React component. It accepts the expensive function and works by storing the value produced from the function when that is passed the same arguments repeatedly.
