CRUD application with @ngrx/store

For a practical example, we will reuse the same CRUD sample implementation from the section CRUD sample implementation with DataTable. Start off by adding the ngrx dependencies for a Redux-based application:

npm install @ngrx/store @ngrx/core --save

First of all, we need to define a shape for the store. In real applications, most likely available employees and currently selected employee might be shared across several components. Hence the store could be defined as follows:

export interface AppStore {
  employees: Employee[];
  selectedEmployee: Employee;
}

Next, we need to define actions which consist of types and optional payloads.

The best practice is to create Action Creator Services encapsulating associated actions:
https://github.com/ngrx/ngrx.github.io/blob/master/store/recipes/actions/action_services.md

We will create the service CrudActions with four CRUD actions and associated action creators:

@Injectable()
export class CrudActions {
  static LOAD_EMPLOYEES...