Something Carmack calls out but the OP doesn't is that if you can break out logic with no side effects into its own function that's usually a good idea. I thin

Something Carmack calls out but the OP doesn't is that if you can break out logic with no side effects into its own function that's usually a good idea. I think the left side would have benefited from pizza.Toppings = get_pizza_toppings(order.kind) in this case to keep the mutation of the pizza front and center in the main function here.