Creating the store

The initial state is useful when the application first starts. This is enough to render components, but that's about it. Once the user starts interacting with the UI, you need a way to change the state of the store. In Redux, you assign a reducer function to each slice of state in your store. So, for example, your app would have a Home reducer, an App reducer, and an Article reducer.

The key concept of a reducer in Redux is that it's pure and side-effect free. This is where having Immutable.js structures as state comes in handy. Let's see how to tie your initial state to the reducer functions that will eventually change the state of our store:

import { createStore, combineReducers } from "redux";
import initialState from "./initialState";
import App from "./App";
import Home from "./Home";
import Article from "./Article";

export default createStore(
  combineReducers({
    App,
    Home,
    Article
  }),
  initialState...