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.