Adapter : Allows for two incompatible classes to work together by wrapping an interface around one of the existing classes.Singleton : Ensures only one instance of an object is created.Prototype : Creates a new object from an existing object.Factory Method : Creates objects without specifying the exact class to create.Builder : Uses to create complex objects.Abstract Factory : Allows the creation of objects without specifying their concrete type.Behavioral Patterns provide how these objects interact or communicate.Structural Patterns provide relationships between these objects.Creational Patterns provide different ways to create objects.The Gang of Four Design Patterns are broken into three categories : Design Patterns tell us how we should structure our classes and how these classes should talk to each other. What are Design Patterns?ĭesign Patterns are elegant solution to common repeating problems in software design. The four authors of the book : Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides, have since been dubbed “The Gang of Four”. Over 25 years ago the iconic computer science book “ Design Patterns: Elements of Reusable Object-Oriented Software” which consists of 23 design patterns was first published.
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