React Hooks: useCallback All In One

React Hooks: useCallback All In One

useCallback

useCallback(fn, deps) === useMemo(() => fn, deps)

const memoizedCallback = useCallback(
  () => {
    doSomething(a, b);
  },
  [a, b],
);

// Returns a memoized callback.



const memoizedValue = useMemo(() => computeExpensiveValue(a, b), [a, b]);
// Returns a memoized value.

demos

useRef

refs

https://reactjs.org/docs/hooks-reference.html#usecallback

https://reactjs.org/docs/hooks-reference.html#useref

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