12 Design Patterns You Must Know 1. Factory Pattern 🏭 Imagine a factory that produces different products. Similarly, this pattern creates objects without specifying their exact class, making code flexible and easy to extend. 🧩 2. Observer Pattern 🔍 Like subscribing to updates! Objects (observers) register to watch changes in a subject. When the subject changes, observers are notified automatically. 📡🔔 3. Singleton Pattern 🕊️ The one and only! Ensures a class has only one instance globally accessible. Useful for managing shared resources like databases. 🌐🔒 4. Builder Pattern 🛠️ Building complex objects step by step. Think of it as assembling Lego bricks to create something intricate without the mess! 🧱🏗️ 5. Adapter Pattern 🌉 Bridging the gap! Converts the interface of one class into another interface clients expect. Makes incompatible components work together. 🔌🔌 6. Decorator Pattern 🎈 Like adding toppings to your pizza! Dynamically adds responsibilities to objects without changing their code. A flexible alternative to subclassing. 🍕✨ 7. Proxy Pattern 🕶️ Virtual representative! Controls access to an object, acting as a stand-in with additional functionality, like lazy loading. 🔒🔍 8. Strategy Pattern 🎯 Switching strategies seamlessly! Allows selecting algorithms during runtime. Useful when you want to provide multiple ways to accomplish a task. 🎮🔄 9. Command Pattern ⌨️ Encapsulates requests as objects, allowing parameterization of clients with different requests and queuing of requests. Think of it as a to-do list for your program. 📋📌 10. Template Pattern 📄 Standardized process steps! Defines the structure of an algorithm, letting subclasses override specific steps. Ideal for reusable workflows. 📊📈 11. Iterator Pattern 🔄 Tour guide for collections! Provides a way to access elements of a collection without exposing its underlying representation. 🚶‍♂️🗺️ 12. State Pattern 🚦 Like a traffic light! Allows an object to change its behavior when its internal state changes. Keeps your code organized as states pile up. 🚥🔄 #Coding #SoftwareEngineering #SoftwareDeveloper