⚡ Design Patterns under 1 min

Quick-reference guide to software design patterns with concise Dart examples.

🏗️ Creational

All about object instantiation.

Pattern	Description
🏭 Abstract Factory	Create families of related objects based on context
🧱 Builder	Construct complex objects step by step
🔨 Factory Method	Let subclasses decide which class to instantiate
♻️ Object Pool	Reuse expensive objects instead of recreating them
🐑 Prototype	Clone existing objects instead of building from scratch
1️⃣ Singleton	Ensure a class has only one instance

🧩 Structural

All about composing classes and objects.

Pattern	Description
🔌 Adapter	Make incompatible interfaces work together
🌉 Bridge	Decouple abstraction from implementation
🌳 Composite	Treat individual objects and groups uniformly
🎀 Decorator	Add behavior dynamically without subclassing
🏛️ Facade	Simplify a complex subsystem with one interface
🪶 Flyweight	Share common state to save memory
📦 Module	Encapsulate code with controlled public API
🔒 Private Class Data	Restrict write access to class attributes
🛡️ Proxy	Control access via a surrogate object

🎭 Behavioral

All about communication between objects.

Pattern	Description
⛓️ Chain of Responsibility	Pass requests along a handler chain
📝 Command	Encapsulate actions as objects with undo support
🔤 Interpreter	Evaluate sentences in a language grammar
🔄 Iterator	Access collection elements sequentially
📡 Mediator	Centralize complex communication between objects
💾 Memento	Capture and restore object state
🚫 Null Object	Provide a do-nothing default to eliminate null checks
👀 Observer	Notify dependents when state changes
🔀 State	Change behavior when internal state changes
🎯 Strategy	Swap algorithms at runtime
📋 Template Method	Define algorithm skeleton, let subclasses fill in steps
🚶 Visitor	Add operations to classes without modifying them