Answer by ArunValaven for Understanding React-Redux and mapStateToProps()

React-Reduxconnect is used to update store for every actions.

import { connect } from 'react-redux';const AppContainer = connect(    mapStateToProps,  mapDispatchToProps)(App);export default AppContainer;

It's very simply and clearly explained in this blog.

You can clone github project or copy paste the code from that blog to understand the Redux connect.