seidme

import { Injectable } from '@angular/core';
import { BehaviorSubject, Subject } from 'rxjs';

import { PuppiesModule } from './puppies.module';
import { Puppy } from './puppy.model';

@Injectable({ providedIn: PuppiesModule })
export class PuppiesStoreService {
  // Make _puppiesSource private so it's not accessible from the outside, 
  // expose it as puppies$ observable (read-only) instead.