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The Proxy Design Pattern is a structural design pattern that provides a placeholder or surrogate for another object to control access to it. A proxy can be used to add additional functionality such as lazy initialization, access control, logging, or caching before or after a request reaches the original object. This post explains the Proxy Pattern with simple real-world examples like payment methods and ATM interactions based on the detailed tutorial. What is the Proxy Design Pattern? The Proxy Pattern involves a proxy object that implements the same interface as the original object and holds a reference to it. The proxy controls access, managing when or how the real object is accessed and manipulated. Real-World Example: Payment System When making payments, one might pay using different methods like cash, credit card, or UPI. These payment modes act as proxies to the actual cash system, adding convenience and flexibility while controlling access to real cash transactions. ...

The Facade Design Pattern is a structural design pattern that provides a simplified interface to a complex system such as a library, framework, or a set of classes. It hides the complexities of the system and provides the client with an easier way to access functionalities. What is the Facade Design Pattern? The Facade Pattern offers a unified interface to a set of interfaces in a subsystem. It defines a higher-level interface that makes the subsystem easier to use by encapsulating the interactions with multiple classes behind a single facade class. Real-World Analogy: Food Delivery App Consider a food delivery app like Zomato. The app serves as a facade that simplifies interactions between customers, restaurants, delivery teams, and delivery partners. Instead of customers interacting separately with all these entities, the app provides a single interface to place an order, which internally manages the complex processes like order preparation, assignment of delivery persons, a...

The Decorator Design Pattern is a structural design pattern that allows behavior to be added to individual objects dynamically without affecting other objects from the same class. It works by wrapping the original object inside special wrapper objects that add the new behavior. This approach is especially useful when there are many possible combinations of behaviors, and subclassing for each variation is not feasible. What is the Decorator Design Pattern? Decorator pattern lets you attach additional responsibilities to an object at runtime. Instead of creating many subclasses for every possible combination, decorators allow behaviors to be composed automatically in a flexible and reusable way. Real-World Analogy: Pizza Toppings Think about ordering a pizza. You start with a base pizza and then add various toppings like extra cheese, jalapenos, mushrooms, etc. Instead of creating a subclass for every topping combination, each topping acts as a decorator that wraps the pizza, ...

The Bridge Design Pattern is a structural design pattern that decouples an abstraction from its implementation, allowing them to vary independently. This pattern is especially useful when dealing with complex class hierarchies that would otherwise lead to an explosion of subclasses. This post explains the Bridge Pattern using a practical example of video streaming platforms and video quality options, demonstrating how to avoid excessive subclassing through composition. What is the Bridge Design Pattern? Instead of using inheritance to combine abstraction and implementation, the Bridge Pattern uses composition to separate these concerns into different class hierarchies. This approach prevents subclass explosion and provides more flexibility in combining behaviors at runtime. Problem Illustration Consider video streaming platforms like YouTube and Netflix offering various video qualities such as HD, 4K, and 8K. A naive design would create subclasses for every combination (e.g....

The Adapter Design Pattern is a structural design pattern that allows objects with incompatible interfaces to work together. It acts as a bridge, converting the interface of a class into another interface clients expect, enabling collaboration despite incompatibility. In this post, we will explore the Adapter Pattern with practical real-world examples, including how it helps adapt different data formats or object interfaces. What is the Adapter Design Pattern? Adapter Pattern allows wrapping an incompatible object with an adapter so that it matches the expected interface. This is commonly used when integrating third-party libraries, legacy code, or systems with varying data formats. Real-World Example: Swiggy Food & Grocery Delivery Imagine the Swiggy app initially supports only food items from restaurants. With the pandemic, it needs to support grocery items from stores, which have a different interface. Using the Adapter Pattern, grocery items are adapted to the existi...

The Prototype Design Pattern is a creational design pattern that involves creating new objects by copying existing ones, known as prototypes. It is especially useful when object creation is costly or complex, and there is a need to avoid the overhead of recreating objects from scratch. In this post the Prototype Pattern is explained with practical examples including object cloning and registry of prototypes. What is the Prototype Design Pattern? The Prototype Pattern allows objects to create copies of themselves. This eliminates the need for the client to know the details of object creation and helps in duplicating objects efficiently. When to Use Prototype Pattern When the cost of creating a new object is expensive or complex. When you want to avoid subclasses for object creation. When objects need to be created dynamically at runtime. Key Components Prototype Interface: Declares a method for cloning itself, typically a clone() method. Concrete Prototype...

The Builder Design Pattern is a creational design pattern that helps construct complex objects step-by-step. It separates the construction of an object from its representation, allowing the same construction process to create different representations. In this post, we will dive into the Builder Pattern, and explore how it simplifies object creation, especially when dealing with many optional parameters or complex objects. What is the Builder Design Pattern? The Builder Pattern provides a way to build complex objects incrementally. It is particularly useful when an object requires many parameters for its construction, some of which might be optional or have default values, making the constructor calls unwieldy. Real-World Analogy Think of assembling a meal at a restaurant. You might want to customize the burger with or without cheese, add extra toppings, choose a side, and select a drink. Instead of creating separate meal classes for all combinations, a builder helps you asse...

The Abstract Factory Design Pattern is a powerful creational design pattern that provides an additional layer of abstraction over the basic Factory Pattern. It helps create families of related or dependent objects without specifying their concrete classes. In this post, we will explore the Abstract Factory Pattern in detail, based on the tutorial from Daily Code Buffer, and understand its application through a practical example involving UI components for different operating systems. What is the Abstract Factory Pattern? The Abstract Factory Pattern defines an interface for creating related or dependent objects without explicitly specifying their classes. It is sometimes described as a 'factory of factories' because it returns one of multiple factories that generate families of objects. Real-World Analogy Imagine creating applications for different operating systems like Windows and Mac. Each operating system has its own proprietary UI components such as buttons, chec...