typescript RX-reselect.ts

Posted 2021-05-21

@Injectable()
class CartQuery {

  shopItemsSelector$ = this.store.select(state => state.shop.items);

  subtotalSelector$ = shopItemsSelector$.map(this.calcTotal);

  private calcTotal = items => items.reduce((acc, item) => acc + item.value, 0);

  constructor(private store: Store<AppState>) {}
}