private void Foo4()
{
OrderLine apple = new OrderLine(quantity: 1, unitPrice: 2.5m, discount: 0.0f);
Order order = new Order(ImmutableList.Create(apple));
order.Lines.ToList().ForEach((c) => Console.WriteLine(c.Discount));
OrderLine discountedApple = apple.WithDiscount(0.3f);
Order discountedOrder = order.ReplaceLine(apple, discountedApple);
discountedOrder.Lines.ToList().ForEach((c) => Console.WriteLine(c.Discount));
}
public Order RemoveLine(OrderLine value)
{
return WithLines(Lines.Remove(value));
}
public Order AddLine(OrderLine value)
{
return WithLines(Lines.Add(value));
}
public Order ReplaceLine(OrderLine oldValue, OrderLine newValue)
{
return oldValue == newValue
? this
: WithLines(Lines.Replace(oldValue, newValue));
}
