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January 9, 2019 20:42
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Functional state container that encapsulates state with closures.
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| const useReducer = (reducer, initState = {}) => { | |
| let state = initState; | |
| const getState = () => state; | |
| const dispatch = action => (state = reducer(state, action)); | |
| return Object.freeze({ getState, dispatch }); | |
| }; | |
| const reducer = (state, action) => { | |
| const actions = { | |
| increment: { count: state.count + 1 }, | |
| decrement: { count: state.count - 1 } | |
| }; | |
| return actions[action.type] || state; | |
| }; | |
| const makeCounter = () => { | |
| const { getState, dispatch } = useReducer(reducer, { count: 0 }); | |
| const get = () => getState().count; | |
| const inc = () => dispatch({ type: "increment" }); | |
| const dec = () => dispatch({ type: "decrement" }); | |
| return Object.freeze({ get, inc, dec }); | |
| }; |
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