[React] useState 和 useReducer 的相互实现

[PeterChen1997]

useReducer 实现 useEffect

const useState = (initState) => {
    const reducer = (prev, action) => {
        return typeof action === "function" ? action(prev) : action;
    };

    return useReducer(reducer, initState);
};

useEffect 实现 useReducer

const useReducer = (reducer, initState) => {
    const [state, setState] = useState(initState);

    const dispatch = (action) => {
        setState((prev) => reducer(prev, action));
    };

    return [state, dispatch];
};