Some description

main.js

// ./main.js
import React from 'react';
import { render } from 'react-dom';
import { Provider } from 'react-redux';
import { createStore, combineReducers } from 'redux';
import {
  Container as Counter,
  reducers as counterReducers
} from './CounterApp';
import {
  Container as FlipFlop,
  reducers as flipFlopReducers
} from './FlipFlopApp';
const store = createStore(
  combineReducers({ ...counterReducers, ...flipFlopReducers })
);
/*
Our store will look like this:
{
    counter: 0,
    flipFlop: true
}
*/
render(
  <Provider store={store}>
    <div>
      <Counter />
      <FlipFlop />
    </div>
  </Provider>,
  document.getElementById('root')
);