redux

actions user.js

import { SET, RESET } from '../types/user'

export function set(payload){
  return {
    type: SET
  , payload
  }
}

export function reset(){
  return {
    type: RESET
  }
}

reducers index.js

import { combineReducers } from 'redux'

import user from './user'

export default combineReducers({
  user
})

reducers user.js

import { SET, RESET } from '../types/user'

const initialState = {
  email: 'user@example.com'
}

export default function reducer(state=initialState, action) {
  switch (action.type) {
    case SET:
      return {...state, ...action.payload}
    case RESET:
      return {...initialState}
    default:
      return state
  }
}

types user.js

const prefix = 'USER/'

export const SET = prefix + 'SET'
export const RESET = prefix + 'RESET'