Both useCallback() and useMemo() provide return values that can be used immediately, while useEffect() does not because its code does not run until much later, ... ... <看更多>

useEffect | useCallback | useMemo | useLayoutEffect | Custom hooks using core hooks ... Now to debug a useEffect, useMemo or useCallback. ... <看更多>

Before hooks the only way to do anything even mildly complicated like save component state or make a network request required a class component, or setting up ... ... <看更多>