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Structural Patterns
Introduction
Adapter Pattern
Bridge Pattern
Composite Pattern
Decorator Pattern
Facade Pattern
Flyweight Pattern
Proxy Pattern
Summary
Behavioral Patterns
Introduction
Chain of Responsibility Pattern
Command Pattern
Iterator Pattern
Mediator Pattern
Memento Pattern
Observer Pattern
State Pattern
Strategy Pattern
Template Method Pattern
Visitor Pattern
Summary
Summary
For quick reference, the following table offers a thorough analysis of the distinctive characteristics, applicability, examples, benefits, and drawbacks of each creational design pattern.
| Pattern Name | Distinctive Feature | Applicability | An Example | Pros | Cons |
|---|---|---|---|---|---|
| Singleton | Ensures only one instance of a class exists. | When a single instance is required to handle several processes, such as configuration management or resource pooling. | Managing a single database connection pool. | - Global access to instance - Ensures a single instance is initialized. | - Can hinder unit testing - Can introduce hidden dependencies. |
| Factory Method | Defines an object creation interface where the type is decided by the subclasses. | When you want to assign object creation to subclasses for more flexibility. | Creating different document types (PDF, Word, etc.) using a common Document class. | - Supports open-closed principle - Decouples creator and products. | - Increases the number of classes - Subclasses must be implemented. |
| Abstract Factory | Provides a way to create groups of related objects without defining concrete classes. | When you want to abstract object creation, you need to make sure that newly formed objects are compatible within a family. | Creating GUI elements in different OS themes (Windows, macOS) using related factories. | - Ensures product compatibility - Supports open-closed principle. | - Can be complex to implement - Extending with new products can be challenging. |
| Builder | Separates construction of complex objects from their representation. | When you need to create complex objects step by step and control the process. | Building a custom meal at a fast-food restaurant. | - Allows step-by-step construction - Supports different representations. | - Can be verbose for simple objects - Requires a Director (optional). |
| Prototype | Creates new objects by copying an existing object. | When creating objects is more complex than copying existing ones or objects have similar structures. | Cloning a complex object, like a customized car configuration. | - Simplifies object creation - Reduces subclassing. | - Deep copying can be complex - Some languages lack built-in support for cloning. |
Prototype Pattern
Introduction
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