Understanding Design Patterns
Adam Freeman · Apress eBooks · 2014
Design patterns are insurance policies for software development. Insurance policies work by trading a little cost now to avoid the possibility of a lot of cost later. The premium you pay to insure a car against theft, for example, costs a few percent of the value of the car, but when the car is stolen, your overall costs are minimized. You still have to go through the inconvenience of having your car stolen, but at least you don’t have to bear the financial loss as well.