createReducer

Similar with react useReducer, but let you use anywhere.

• GIT
  • https://github.com/react-atomic/reshow/tree/main/packages/reshow-flux-base
• NPM
  • https://www.npmjs.com/package/reshow-flux-base

Usage

Accepts a reducer function of type (state, action) => newState. Returns a new store with a dispatch method.

import { createReducer } from "reshow-flux-base";

/**
 * reducer -> (state, action) => newState
 */
const [store, dispatch] = createReducer(reducer, initial[Arg | Function]);

Store methods.

| Methods | Explain | | -------------- | ---------------------------------------------------------------- | | getState | Return current state. | | addListener | You could register any callback function such as react useState. | | removeListener | Remove register callback, such as unmount a component. |

Full App Example

const initialState = { count: 0 };

function reducer(state, action) {
    switch (action.type) {
        case "increment":
            return { count: state.count + 1 };
        case "decrement":
            return { count: state.count - 1 };
        default:
            throw new Error();
    }
}

const [store, dispatch] = createReducer(reducer, initialState);

function Counter() {
    const [state, setState] = useState(() => store.getState());
    useEffect(() => {
        store.addListener(setState);
        return () => {
            store.removeListener(setState);
        };
    }, []);

    return (
        <>
            Count: {state.count}
            <button onClick={() => dispatch({ type: "decrement" })}>-</button>
            <button onClick={() => dispatch({ type: "increment" })}>+</button>
        </>
    );
}

Codesandbox

https://codesandbox.io/s/reshow-flux-base-34umk