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System Design
Mediumsoftware-architecture

18 Key Design Patterns Every Developer Should Know

30 minsdesign patternssoftware development
30 mins
1 sections
design patterns, software development

Overview

Patterns are reusable solutions to common design problems, resulting in a smoother, more efficient development process. They serve as blueprints for building better software structures. These are some of the most popular patterns:

  • Abstract Factory: Family Creator - Makes groups of related items.
  • Builder: Lego Master - Builds objects step by step, keeping creation and appearance separate.
  • Prototype: Clone Maker - Creates copies of fully prepared examples.
  • Singleton: One and Only - A special class with just one instance.
  • Adapter: Universal Plug - Connects things with different interfaces.
  • Bridge: Function Connector - Links how an object works to what it does.
  • Composite: Tree Builder - Forms tree-like structures of simple and complex parts.
  • Decorator: Customizer - Adds features to objects without changing their core.
  • Facade: One-Stop-Shop - Represents a whole system with a single, simplified interface.
  • Flyweight: Space Saver - Shares small, reusable items efficiently.
  • Proxy: Stand-In Actor - Represents another object, controlling access or actions.
  • Chain of Responsibility: Request Relay - Passes a request through a chain of objects until handled.
  • Command: Task Wrapper - Turns a request into an object, ready for action.
  • Iterator: Collection Explorer - Accesses elements in a collection one by one.
  • Mediator: Communication Hub - Simplifies interactions between different classes.
  • Memento: Time Capsule - Captures and restores an object's state.
  • Observer: News Broadcaster - Notifies classes about changes in other objects.
  • Visitor: Skillful Guest - Adds new operations to a class without altering it.
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