Introduction to Design Patterns

Design patterns are reusable solutions to common software design and development problems. They provide a template to common scenarios. 23 design patterns were introduced in the Design Patterns: Elements of Reusable Object-Oriented Software book.

In this section, each design pattern’s core idea, where it is used, and how it is implemented is explained.

3 types:

  • Creational
    • Builder Pattern
    • Singleton Pattern
    • Factory Pattern
    • Abstract Factory Pattern
    • Prototype Pattern
  • Structural
    • Adapter Pattern
    • Bridge Pattern
    • Composite Pattern
    • Decorator Pattern
    • Facade Pattern
    • Flyweight Pattern
    • Proxy Pattern
  • Behavioral
    • Chain of Responsibility Pattern
    • Command Pattern
    • Interpreter Pattern
    • Iterator Pattern
    • Mediator Pattern
    • Momento Pattern
    • Observer Pattern
    • Strategy Pattern
    • State Pattern
    • Template Method Pattern
    • Visitor Pattern
Written by October 7, 2026 1 min read
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