cartService : Medium Blog on Obserbavles

@Injectable()
export class cartService {
  constructor(private httpclient : HttpClient) {}
  private cartSubject = new Subject<CartState>();
    Products : product[]= [];
    CartState = this.cartSubject.asObservable();
    addProduct(_product:any) {
      console.log('in service');
      this.Products.push(_product)
      this.cartSubject.next(<CartState>{loaded: true, products:  this.Products});
    }
    removeProduct(id:number) {
      this.Products = this.Products.filter((_item) =>  _item.id !== id )
      this.cartSubject.next(<CartState>{loaded: false , products:  this.Products});
    }

  getAllProducts() : Observable <any> {
    return this.httpclient.get(url).map((res : Response) => res.json())
      .catch((error : any) => Observable.throw('Server error'));
  }

}