重构30-Return ASAP（尽快返回）

该话题实际上是诞生于移除箭头反模式重构之中。在移除箭头时，它被认为是重构产生的副作用。为了消除箭头，你需要尽快地return。

public class Order {
    public Customer Customer;//getter setter

    public Double CalculateOrder(Customer customer, List<Product> products, Double discounts) {
        Customer = customer;
 
        Double orderTotal = 0d;
        if (products.size() > 0) {
            orderTotal = sum(products);
            if (discounts > 0) {
                orderTotal -= discounts;
            }
        }
        return orderTotal;
    }
}

该重构的理念就是，当你知道应该处理什么并且拥有全部需要的信息之后，立即退出所在方法，不再继续执行。

public class Order {
    public Customer Customer;//getter setter

    public  Double CalculateOrder(Customer customer, List<Product> products,  Double discounts) {
        if (products.size() == 0){
            return 0d;  
        }
        Customer = customer;
         Double orderTotal = sun(products);
        if (discounts == 0)
            return orderTotal;
        orderTotal -= discounts;
        return orderTotal;
    }
}

来自为知笔记(Wiz)