```js
const createAction = (type) => {
  const actionCreator = (payload) => ({
    type,
    payload,
  })

  actionCreator.type = type

  return actionCreator
}

const createReducer = (actionHandlers, initialState) => (
  (state = initialState, action) => {
    const handler = actionHandlers[action.type]

    return handler ? handler(state, action) : state
  }
)
```

usage:

```js
export const fetchMany = createAction(`foo/FETCH_MANY`)


console.log(fetchMany.type) // 'foo/FETCH_MANY'
console.log(fetchMany()) // {type: 'foo/FETCH_MANY', payload: null}

// dispatch(fetchMany(payload))


const actionHandlers = {
  [fetchMany.type]: (state, action) => ({ ...state, ...action.payload })
}

const initialState = {}

const fooReducer = createReducer(actionHandlers, initialState)

```