/*
 2. then, we generate a service that can be used as bridge between these components
*/

@Injectable()
export class CurrentUserStoreService {
  // initial value with nnull or something else, for example undefined
  private currentUserSubject = new BehaviorSubject<User>(null);

  // some one might subscribe this to get real-time value, as below
  public currentUserSubject$ = this.currentUserSubject.asObservable();

  // some one might use this to change value
  setCurrentUser(user: User) {
    this.currentUserSubject.next(user);
  }
}