Design Patterns

Reference for 26 design patterns organized by intent (creational, structural, behavioral), with implementations in PHP, Python, Java, C++ and others, UML guidance, and practical use cases.

Pattern Index

Creational Patterns

• Abstract Factory - Produce families of related objects without specifying their concrete classes → reference
• Builder - Assemble complex objects through a step-by-step process → reference
• Factory Method - Declare an interface for object creation, letting subclasses determine the concrete type → reference
• Prototype - Duplicate existing objects without coupling to their concrete classes → reference
• Singleton - Guarantee that a class has exactly one instance → reference
• Object Pool - Recycle expensive-to-create objects for repeated use → reference