Creational Patterns: Singleton, Factory Method, and Prototype

Abstract

Gang of Four (GoF) patterns are classified into three categories: creational, structural, and behavioral. In this chapter, you will begin by dissecting a few creational patterns. As the name suggests, creational patterns are design patterns that deal with creation of objects, or object instantiation. The C# language uses the new keyword to instantiate an object of a class. Typically, you use the new keyword wherever that object is being utilized. However, this means you must specify a concrete type name at that location. In certain real-world scenarios, as you will learn in this and the next chapter, it becomes necessary to isolate the object instantiation logic and code from the class that utilizes the object. That’s where creational patterns come into the picture.