addToCart function

String? addToCart(
  1. ProductData service,
  2. String stringAlreadyInCart
)

Implementation

String? addToCart(ProductData service,
    String stringAlreadyInCart  /// strings.get(210) /// This service already in the cart
    ){
  for (var item in cart)
    if (item.id == service.id)
      return stringAlreadyInCart;
  cart.add(ProductData.clone(service));
  cartSave();
}