Behavioural Patterns

Behavioural Patterns focus on how objects cooperate and pass work along, using techniques like commands or observers to reduce tight links and simplify testing.

• Chain of Responsibility Pattern: Leave Request Approval Chain

  Explains the Chain of Responsibility Pattern in C# using a leave approval analogy to show how requests are passed until someone handles them.

• Command Pattern: Voice Assistant (e.g. Alexa, Siri)

  Explains the Command Pattern in C# using the voice assistant analogy to show how requests are wrapped as objects and executed separately.

• Interpreter Pattern: Language Translator

  Explains the Interpreter Pattern in C# using the language interpreter analogy, showing how structured input can be evaluated using grammar rules.

• Iterator Pattern: Elevator Stopping at Each Floor

  Explains the Iterator Pattern in C# using the elevator and floor analogy to show how to move through collections without knowing their internal structure.

• Mediator Pattern: Air Traffic Controller

  Explains the Mediator Pattern in C# using an air traffic controller analogy, showing how to decouple objects by routing communication through a central mediator.

• Memento Pattern: Game Save Feature

  Explains the Memento Pattern in C# using the save game feature analogy, showing how to capture and restore object state safely.

• Null Object Pattern: Default Voicemail Greeting

  Explains how the Null Object Pattern avoids null checks using a default voicemail analogy.

• Observer Pattern: YouTube Subscriber

  Explains the Observer Pattern in C# using the YouTube subscription analogy, including how to implement subjects and observers.

• State Pattern: Phone Modes — Silent, Vibrate, Normal

  Explains the State Pattern in C# using the phone mode analogy, showing how internal state determines behaviour and how to isolate logic with state classes.

• Strategy Pattern: Navigation App Routes

  Explains the Strategy Pattern in C# using the navigation app analogy, showing how to swap interchangeable algorithms without changing business logic.

• Template Method Pattern: Baking a Cake from a Recipe

  Explains the Template Method Pattern in C# using the cake recipe analogy, showing how to define a structure with customisable steps.

• Visitor Pattern: Visitors at a Company Office

  Explains the Visitor Pattern in C# using a company visitor analogy, where different types of visitors interact with departments without modifying them.

• Specification Pattern: Club Entry Rules

  The Specification Pattern is a design approach in C# for defining business rules as modular, reusable objects that can be easily combined.

• Pipeline / Middleware Pattern: Assembly Line in a Factory

  The Pipeline (Middleware) Pattern is a flexible design approach in C# that allows data or requests to pass through a chain of reusable steps, where each step can modify, inspect, or terminate the flow.