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Learning these patterns helps unexperienced developers to learn software design in an easy and faster way.
As per the design pattern reference book Design Patterns - Elements of Reusable Object-Oriented Software , there are 23 design patterns which can be classified in three categories: Creational, Structural and Behavioral patterns.
Wherever possible, apply the pattern in a way the will reduce the amount of cutting. Putting it in the middle would mean having to cut both top and bottom out.
They were instituted during WWII because so many mail clerks had been drafted and zones made it easier for the new, inexperienced clerks to sort mail.These authors are collectively known as Gang of Four (GOF).