Redux Quick Start Guide

Login page reducer

We've already discussed what a reducer is and what it does. In this section, we are simply going to set up a reducer for login. Create a reducer.js file inside app/containers/App. Since we are dealing with immutable JS, as discussed in Chapter 2, Testing:

import { fromJS } from 'immutable';import Cookie from 'js-cookie';import {  LOGIN_REQUEST,  LOGIN_SUCCESS,  LOGIN_FAILURE,  LOGOUT_REQUEST,} from 'containers/Login/constants';// The initial state of the Appconst initialState = fromJS({  loading: false,  currentUser: {},});function appReducer(state = initialState, action) {  switch (action.type) {    case LOGIN_FAILURE:    case LOGIN_REQUEST:    case LOGOUT_REQUEST: {      Cookie.remove('token'); return state.set('loading', true).set('currentUser', ...