Design Patterns
State Pattern
You’ve probably written code where an object’s behavior depends on some status or mode field — and then watched a simple if turn into a giant nested if/else or switch as features …
Observer Pattern
Any time you subscribe to something — a newsletter, a Twitch stream, a weather app — you’re living in the world of the Observer pattern. Observer is a behavioral design pattern …
Memento Pattern
Sometimes you just want to hit undo and pretend the last few minutes never happened — in your editor, not in life (unfortunately). That’s exactly the kind of problem the Memento …
Chain of Responsibility Pattern
The Chain of Responsibility pattern is what you reach for when you want to send a request into a pipeline and let whoever can handle it, handle it. It’s a behavioral pattern that …
Singleton Pattern
The Singleton pattern is likely the most famous—and most abused—creational pattern. It restricts a class to a single instance and exposes a global way to access it. Used carefully, …
Prototype Pattern
The Prototype pattern is what you reach for when “just call the constructor again” is too expensive—or too painful to configure repeatedly. Instead of creating new instances from …
Factory Method Pattern
The Factory Method pattern is the one you use when you want to say “give me a transport,” not “new Truck()” or “new Ship()”. It defines an interface for creating objects but lets …
Builder Pattern
The Builder pattern is what you reach for when a constructor has become a small novel of parameters and optional flags. It’s a creational pattern that lets you construct complex …
Abstract Factory Pattern
The Abstract Factory pattern is one of those tools that quietly keeps large systems from turning into a mess of if (platform == ...) checks. It’s a creational pattern that provides …
What Are Design Patterns
Design patterns are one of those topics that sound academic until the day you recognize one in a gnarly codebase and realize, “Oh, this is just a badly implemented …