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| import React from "react"; | |
| import useMutableReducer from "./useMutableReducer"; | |
| const reducer = (draft, action, state) => { | |
| switch (action) { | |
| case "increment": | |
| draft.count++; | |
| break; | |
| case "decrement": | |
| draft.count--; | |
| } | |
| }; | |
| const App = () => { | |
| const [state, dispatch] = useMutableReducer(reducer, { count: 0 }); | |
| return ( | |
| <> | |
| <h1>{state.count}</h1> | |
| <button onClick={() => dispatch("increment")}>+</button> | |
| <button onClick={() => dispatch("decrement")}>-</button> | |
| </> | |
| ); | |
| }; |
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| import {useReducer, useCallback} from 'react'; | |
| import {produce} from 'immer'; | |
| function useMutableReducer(reducer, initialState, initialAction) { | |
| const mutableReducer = useCallback( | |
| (state, action) => { | |
| return produce(draft => { | |
| return reducer(draft, action, state); | |
| }); | |
| }, | |
| [reducer] | |
| ); | |
| return useReducer(mutableReducer, initialState, initialAction); | |
| } |
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