/ Design Patterns / Catalog Creational Design Patterns Creational design patterns are responsible for efficient object creation mechanisms, which increase the flexibility and reuse of existing code. Factory Method Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses. Abstract Factory Provide an interface for creating families of related or dependent objects without specifying their concrete classes. Builder Separate the construction of a complex object from its representation so that the same construction process can create different representations. Prototype Specify the kinds of objects to create using a prototypical instance, and create new objects by copying this prototype. Singleton Ensure a class has only one instance, and provide a global point of access to it.