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Mastering `useMemo` and `useCallback` in React: A Deep Dive

  • Two powerful hooks in React, useMemo and useCallback, help optimize rendering behavior, avoid unnecessary recalculations, and manage referential integrity.
  • useMemo memoizes the result of a computation to avoid recomputation when dependencies change. useCallback memoizes the function reference itself to prevent recreation on every render.
  • A real-world example in the article demonstrates using useMemo and useCallback for optimizing heavy calculations, like Fibonacci, and preventing unnecessary function recreations.
  • Best practices for using useMemo and useCallback include ensuring accurate dependency arrays, using them only when necessary, and combining them to prevent unnecessary re-renders and speed up calculations.

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