Factory Method
Defines an interface for creating an object, but lets subclasses decide which class to instantiate.
Read more →Software Design Knowledge Base
Master Software
Design Patterns
From foundational GoF patterns to enterprise architecture — comprehensive guides with production-ready code examples in 11 programming languages.
23GoF Patterns
14Enterprise Patterns
5SOLID Principles
11Languages
Explore by Category
GoF Design Patterns
The classic 23 patterns from Design Patterns: Elements of Reusable Object-Oriented Software — every software developer's essential toolkit.
5 Creational7 Structural11 Behavioral
Browse all 23 patterns →Enterprise Architecture
Battle-tested blueprints for structuring large-scale systems: Clean Architecture, CQRS, Event Sourcing, Hexagonal Architecture, and more.
Clean ArchitectureHexagonal ArchitectureLayered ArchitectureOnion Architecture+10 more
Explore 14 patterns →SOLID Principles
Five foundational object-oriented design principles that make software more maintainable, flexible, and easy to extend.
SSRPOOCPLLSPIISPDDIP
Learn SOLID →Code Quality Principles
The rules that keep codebases clean, consistent, and easy to change — DRY, OAOO, SSOT, and KISS.
GoF Design Patterns
Search and filter all 23 classic patterns
Abstract Factory
Provides an interface for creating families of related or dependent objects without specifying their concrete classes.
Read more →Singleton
Ensures that a class has only one instance and provides a global point of access to it.
Read more →Builder
Separates the construction of a complex object from its representation.
Read more →Prototype
Creates new objects by copying an existing object (prototype).
Read more →Adapter
Allows objects with incompatible interfaces to work together.
Read more →Bridge
Splits a large class or set of closely related classes into two separate hierarchies.
Read more →Composite
Composes objects into tree structures to represent part-whole hierarchies.
Read more →Decorator
Attaches additional responsibilities to an object dynamically.
Read more →Facade
Provides a simplified interface to a complex subsystem.
Read more →Flyweight
Shares common state between multiple objects to save memory.
Read more →Proxy
Provides a surrogate or placeholder for another object to control access to it.
Read more →Chain of Responsibility
Passes a request along a chain of handlers until one handles it.
Read more →Command
Encapsulates a request as an object, allowing parameterization and queuing.
Read more →Interpreter
Defines a grammar and interpreter for a language.
Read more →Iterator
Provides a way to access elements of a collection sequentially.
Read more →Mediator
Reduces coupling between objects by centralizing their communication.
Read more →Memento
Captures and externalizes an object's state for later restoration.
Read more →Observer
Defines a one-to-many dependency between objects for automatic notifications.
Read more →State
Allows an object to alter its behavior when its internal state changes.
Read more →Strategy
Defines a family of algorithms and makes them interchangeable.
Read more →Template Method
Defines the skeleton of an algorithm, deferring some steps to subclasses.
Read more →Visitor
Separates an algorithm from the object structure it operates on.
Read more →