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Limitations of Simple Factory Pattern The Simple Factory pattern successfully separates object creation from business logic, but it violates the Open-Closed Principle. This principle states that software entities should be open for extension but closed for modification. Consider a scenario where you need to add a new monster type called Beast. ...

In our previous discussion of the Simple Factory pattern, we created a single factory that produced different types of products. Today, we'll explore how this evolves into the Factory Method pattern. Imagine our business has grown, and instead of having one factory that produces multiple types of vehicles, we now want specialized factories, eac ...

Behavioral patterns define how objects interact and ditsribute responsibilities. The Strategy pattern encapsulates algorithms within interchangeable objects, enabling runtime selection of difefrent behaviors. Pattern Components The Strategy pattern consists of three core elements: Strategy Interface: Defines the common contract for all algorit ...

The Chain of Responsibility pattern is a behavioral design pattern that decouples the sender of a request from its receiver by giving multiple objects a chance to handle the request. These objects are linked into a chain, and the request travels along this chain until one of the handlers processes it. This approach allows you to add or modify h ...

The Observer pattern establishes a one-to-many dependency between objects. When the state of a single "subject" (the observable) changes, all registered "observers" are notified and updated automatically. This decoupling allows the subject to broadcast changes without needing to know the specific implementation details of it ...

Flyweight Pattern Concept The Flyweight pattern addresses memory efficiency by sharing common data across multiple objects rather then storing duplicate information. This approach is particularly valuable when dealing with systems that require numerous fine-grained objects with significant overlapping attributes. Consider an e-commerce shipping ...

Moving into an unfurnished apartment requires adding flooring, lighting, and furniture to make it livable. Over time, you might swap pieces or introduce new amenities without rebuilding the walls. Software objects often face a similar need: capabilities must be layered onto core behavior at runtime without altering the underlying structure. The ...

Instantiation logic often becomes tightly coupled with business requirements when objects are created directly using the new keyword. Modifying these dependencies later requires widespread code changes, violating the Open/Closed Principle. Creational design patterns abstract the object creation process, centralizing initialization logic and enh ...

Background In object-oriented systems, certain objects may be expensive to create, or some operations require security checks. Directly accessing such objects can introduce complications. One solution is to introduce an intermediate layer—the proxy layer. This is the essence of the Proxy Pattern. The Proxy Pattern, one of the 23 classic design ...

Understanding the Builder Pattern The Builder design pattern aims to separate the construction of a complex object from its representation. This allows the same construction process to create different representations. It is primarily useful when an object's creation involves multiple steps, complex logic, or many components. Core Concept and B ...