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# `createReducer`
Factory for reducer hooks with custom middleware with an identical API as [React's `useReducer`](https://reactjs.org/docs/hooks-reference.html#usereducer). Compatible with [Redux middleware](https://redux.js.org/advanced/middleware).
## Usage
An example with [`redux-thunk`](https://github.com/reduxjs/redux-thunk) and [`redux-logger`](https://github.com/LogRocket/redux-logger).
```jsx
import { createReducer } from 'react-use';
import logger from 'redux-logger';
import thunk from 'redux-thunk';
const useThunkReducer = createReducer(thunk, logger);
function reducer(state, action) {
switch (action.type) {
case 'increment':
return { count: state.count + 1 };
case 'decrement':
return { count: state.count - 1 };
case 'reset':
return { count: action.payload };
default:
throw new Error();
}
}
const Demo = ({ initialCount = 1 }) => {
// Action creator to increment count, wait a second and then reset
const addAndReset = React.useCallback(() => {
return dispatch => {
dispatch({ type: 'increment' });
setTimeout(() => {
dispatch({ type: 'reset', payload: initialCount });
}, 1000);
};
}, [initialCount]);
const [state, dispatch] = useThunkReducer(reducer, initialCount);
return (
<div>
<p>count: {state.count}</p>
<button onClick={() => dispatch(addAndReset())}>Add and reset</button>
<button
onClick={() => dispatch({ type: 'reset', payload: { count: initialCount }})}
>
Reset
</button>
<button onClick={() => dispatch({ type: 'increment' })}>+</button>
<button onClick={() => dispatch({ type: 'decrement' })}>-</button>
</div>
);
};
```
## Reference
```js
const useMiddlewareReducer = createReducer(...middlewares);
```
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