Creating a shopping cart application with Redux

Create a new Flutter application named cart_redux and copy item.dart into your lib folder, as we have been doing in the previous sections. Add dependencies for equatable and flutter_redux from pub.dev. Let's get started, as follows:

1. Create a new file named actions.dart and add the following code to it:

   import 'item.dart';
   class Actions {}
   class AddItemToCartAction extends Actions {
     final Item item;
     AddItemToCartAction({required this.item});
   }
   class RemoveItemFromCartAction extends Actions {
     final Item item;
     RemoveItemFromCartAction({required this.item});
   }

   Both of these actions are self-explanatory; we will be using these to trigger the addition/removal of items to and from the cart.

2. Create a file named cart_state.dart and add the following code to it:

   import 'package:equatable/equatable.dart';
   import 'package:redux/redux.dart';
   import 'actions...