🚀 Day 60: Bridge Pattern 🎉.Split your abstractions (Car, SUV, Sedan) from implementations (ElectricEngine, PetrolEngine, DieselEngine) to avoid n×m subclasses. Mix & match at runtime:.🔗 #BridgePattern #DesignPatterns #Day60.

🚀 Day 59: Pluggable Payment Gateway 💳.• Strategy: PaymentGateway interface per provider.• Factory: GatewayFactory.getGateway().• Adapter: BankingSystem hides SDKs.• Facade: PaymentService orchestrates validate→initiate→confirm.🔗#SystemDesign #D59.

🚀 Day 58: Chain of Responsibility 🛠️.Requests flow through handlers—each can handle or pass on. ATM example: Thousand → FiveHundred → Hundred notes. • Extensible.• Single-responsibility.• Runtime flexibility.🔗 #Systemdesign #lld #Day58OfLearning.

🚀 Day 57: Proxy Pattern 🛡️.Use a surrogate to control access to real objects:.1️⃣ Virtual – lazy-load heavy resources.2️⃣ Protection – enforce permissions.3️⃣ Remote – hide RPC/HTTP details.🔗 #ProxyPattern #DesignPatterns #Day57OfLearning.#LearnInPublic.

🚀 Day 56: Template Method Pattern 🛠️.• Abstract run() = load → preprocess → train → evaluate → save.• Concrete subclasses override only the variable steps.• Use Case: ) with UPI, Card, Wallet variants.🔗 #DesignPatterns.

🚀 Day 55: Composite Pattern 🌳.Treat files & folders uniformly with one interface:.• FileSystemItem { ls(); openAll(); getSize(); }.• File = leaf, Folder = composite (delegates to children)Benefits: uniform API, easy extension, cleaner client code. 🔗

🎶 Day 54: Scalable Music Player Architecture 🎶.• Singletons for managers.• Strategy for sequential/shuffle/custom play.• Adapter to unify Bluetooth, wired, headphone APIs.• Factory to instantiate device adapters.• Facade as a single play() API.🔗

🚀 Day 53: Facade Pattern .Problem: Booting a PC needs power, cooling, CPU init, memory tests, HDD spin-up, BIOS, OS—every caller juggling these is a nightmare.Solution: ComputerFacade.startComputer() hides all that! Clients see one simple.🔗 #Day53.

X (Twitter).🚀 Day 52: Adapter Pattern in 280 chars 🚀.• Problem: Client expects getJsonData(), but only getXmlData() exists. • Solution: Wrap XmlDataProvider in an Adapter implementing IReports. Read🔗 #AdapterPattern #SystemDesign #Day52 #LearnInPublic.

🚀 Day 51: Command Pattern in 280 chars 🚀. • Command = object with execute()/undo(). • RemoteControl holds commands → pressButton() calls execute(). • LightCommand: execute() = light.on(), undo() = ). 🔗#SystemDesign #Day51.

🚀 Day 50: Designing a Flexible Notification System🔔.•Observer Pattern: Push updates to subscribers instead of polling.•Decorator Pattern: Wrap base notifications to add timestamps, signatures.•Strategy Pattern: Swap delivery methods without changing logic.#SoftwareDesign.

🚀 Day 49: Decorator Pattern 🎨.Key Points:.• IComponent: getAbilities().• Decorator: holds IComponent, adds extra logic.• Concrete Decorators: chainable, append new behavior.Learn more 👉 #DecoratorPattern #SystemDesign #Day49OfLearning #LearInPublic.

🚀 Day 48: Observer Design Pattern 🔔.• One-to-many relationship: when an Observable changes, all Observers get notified automatically. • YouTube Example: Channel (Observable) pushes new-video alerts to Subscribers (Observers)—no polling needed! 🎥➡️📲.#DesignPatterns #Day48.

🚀 Day 47: Designing “Tomato” Food-Delivery App 🍅.• Search → Cart → Checkout → Notify.• Singleton Managers (RestaurantManager, OrderManager).• OrderFactory (Now vs. Scheduled).• PaymentStrategy (UPI, Card, NetBanking).Full details 👉 #SystemDesign.

🚀 Day 46: Singleton Pattern 🔒.• Lazy (not thread-safe): create on first call.• Synchronized: ensure only one thread enters getInstance().• Double-Checked Locking: minimize locking with volatile.Read more 👉 #DesignPatterns #Singleton #Day46OfLearning.

🚀Day 45: Factory Pattern.• Simple Factory: One class picks which subclass (e.g., BurgerFactory).• Factory Method: Subclasses decide which object to create at runtime.• Abstract Factory: Build families of related objects (e.g., Burger + Bread).Read :

🚀Day 44: Strategy Pattern.Avoid monster inheritance—encapsulate behaviors (talk, walk, fly) in separate strategy classes and inject at runtime. • Swap algorithms without changing Robot.• Real-world: UPI/Card/Bank payment strategies.Read 👉 #Systemdesign.

🚀 Day 43: Google Docs LLD ✍️.Bad: One giant Editor → breaks SRP & OCP.Good:.• DocumentElement → Text, Image, Video….• Persistence → File, DB, Cloud.• Document + Editor orchestrateFollows SRP, OCP, LSP, ISP & DIP .Read more 👉 #Day43OfLearning.

🚀 Day 42: OOP & UML Refresher 🔄.• Pillars: Abstraction, Encapsulation, Inheritance, Polymorphism.• UML: Class + Sequence diagrams.Boost your design skills .read more 👉 #OOP #UML #SoftwareDesign #Day42OfLearning.

🚀 Day 40: SOLID Principles 🔧.S SRP: One class, one responsibility.O OCP: Extend without editing.L LSP: Subclasses honor contracts.I ISP: Split fat interfaces.D DIP: Depend on abstractions.Build clean, scalable code! 🚀.Read 👉 #SOLID #Day40OfLearning.