majiayu000/claude-arsenal
xiaohongshu
xiaohongshu
286 148
View 
GoF Design Patterns Reference
gof-patterns
Gang of Four design patterns reference. Use this skill when implementing, discussing, or choosing object-oriented design patterns. Auto-activates for architecture decisions, refactoring, and decoupling concerns. Comprehensive coverage of all 23 GoF patterns with pseudocode examples.
SKILL.md
Full skill instructions
GoF Design Patterns Reference
A comprehensive reference for the Gang of Four design patterns. This skill provides language-agnostic guidance with pseudocode examples that can be translated to any programming language.
When This Skill Activates
This skill automatically activates when you:
- Ask about or need to implement a design pattern
- Need to choose between patterns for a design problem
- Are refactoring code and considering structural improvements
- Discuss architecture, decoupling, or extensibility
- Mention specific patterns: factory, singleton, observer, decorator, etc.
Quick Pattern Reference
Creational Patterns (Object Creation)
| Pattern | Intent | Use When |
|---|---|---|
| Abstract Factory | Create families of related objects | Need platform/theme independence |
| Builder | Construct complex objects step-by-step | Object has many optional parts |
| Factory Method | Let subclasses decide which class to instantiate | Don't know concrete types ahead of time |
| Prototype | Clone existing objects | Object creation is expensive |
| Singleton | Ensure single instance | Need exactly one shared instance |
Structural Patterns (Composition)
| Pattern | Intent | Use When |
|---|---|---|
| Adapter | Convert interface to expected interface | Integrating incompatible interfaces |
| Bridge | Separate abstraction from implementation | Need to vary both independently |
| Composite | Treat individual and groups uniformly | Have tree structures |
| Decorator | Add responsibilities dynamically | Need flexible extension |
| Facade | Simplified interface to subsystem | Complex subsystem needs simple API |
| Flyweight | Share common state efficiently | Many similar objects needed |
| Proxy | Control access to object | Need lazy loading, access control, logging |
Behavioral Patterns (Communication)
| Pattern | Intent | Use When |
|---|---|---|
| Chain of Responsibility | Pass request along handler chain | Multiple handlers, unknown which handles |
| Command | Encapsulate request as object | Need undo, queue, or log operations |
| Interpreter | Define grammar and interpret sentences | Have a simple language to parse |
| Iterator | Sequential access without exposing internals | Need to traverse collections |
| Mediator | Centralize complex communications | Many objects communicate in complex ways |
| Memento | Capture and restore object state | Need undo/snapshot functionality |
| Observer | Notify dependents of state changes | One-to-many dependency |
| State | Alter behavior when state changes | Object behavior depends on state |
| Strategy | Encapsulate interchangeable algorithms | Need to swap algorithms at runtime |
| Template Method | Define skeleton, let subclasses fill in | Algorithm structure fixed, steps vary |
| Visitor | Add operations without changing classes | Need to add many operations to stable structure |
Decision Guide
See Pattern Selection Guide for help choosing the right pattern.
How to Use This Reference
- Choosing a pattern: Start with the decision guide or tables above
- Learning a pattern: Read the full documentation with examples
- Quick reminder: Use the tables above for at-a-glance reference
- Implementation: Follow the pseudocode, adapt to your language
Language Translation Notes
The pseudocode in this reference uses these conventions:
classfor type definitionsfunctionfor methods/functions->for method calls on objects//for comments- Type hints shown as
name: Type
Translate to your language:
- PHP:
class,function,->,//, type hints in docblocks or PHP 8+ - JavaScript/TypeScript:
class,function/arrow,.,//, TS types - Python:
class,def,.,#, type hints - Java/C#: Direct mapping with
new, generics
Based on concepts from "Design Patterns: Elements of Reusable Object-Oriented Software" by Gamma, Helm, Johnson, and Vlissides (Gang of Four), 1994.
More skills from majiayu000
majiayu000/claude-arsenal
technical-spec
technical spec
286 141
View majiayu000/claude-arsenal
product-ux-expert
product ux expert
286 133
View majiayu000/claude-arsenal
database-patterns
database patterns
286 119
View majiayu000/claude-skill-registry
agent-task-conductor
Conduct multi-agent task orchestration and workflow coordination.
663 1
View majiayu000/claude-skill-registry
conductor-setup
Initialize project with Conductor artifacts (product definition,
663 1
View majiayu000/claude-skill-registry
animation-designer
Expert in web animations, transitions, and motion design using Framer Motion and CSS
663 1
View majiayu000/claude-skill-registry
diagramming
Creates Mermaid and ASCII diagrams for flowcharts, architecture, ERDs, state machines, mindmaps, and more. Use when user mentions diagram, flowchart, mermaid, ASCII diagram, text diagram, terminal diagram, visualize, C4, mindmap, architecture diagram, sequence diagram, ERD, or needs visual docume...
663 1
View majiayu000/claude-skill-registry-data
h3-pg
PostgreSQL bindings for H3 hexagonal grid system. Use when working with H3 cells in Postgres, including spatial indexing, geometry/geography integration, and raster analysis.
23 1
View majiayu000/claude-skill-registry
conductor-development
Context-Driven Development skill for projects using Conductor. Use this skill when you detect a `conductor/` directory in the project, when working on tasks defined in a `plan.md` file, or when the user asks about tracks, specs, or plans. Automatically applies TDD workflow, tracks task completion...
663 1
View majiayu000/claude-skill-registry
conductor-status
Display project status, active tracks, and next actions
663 1
View majiayu000/claude-skill-registry
dockerization
Official Stakpak application containerization standard operating procedure, a step-by-step guidline to properly dockerize applications. This is a rule book curated by the Stakpak Team.
663 1
View Popular AI tools
Video
Kaiber
Generate, edit, and beat-sync AI video with leading models in one workspace.
Paid
View Productivity
Vimcal
The world's fastest calendar for remote work
Free
View Images
IMGCreator.ai
Transform Your Design with AI Designer by ImgCreator.ai
Freemium
View Content & writing
Akool AI
Revolutionizing Video Production with AI-Powered Creativity
Paid
View Images
Clipdrop Uncrop
Extend an image past the frame and let AI fill the new aspect ratio.
Freemium
View Security
StarByFace
Discover your celebrity doppelgänger with StarByFace!
Free
View C
Finance
ChainClarity
ChainClarity explains 700+ crypto whitepapers in plain English, with layered summaries, comparisons, research tools, alerts, and a $4.99 Pro plan.
Freemium
View Coding & apps
Opus Clip
Opus.ai: Revolutionize Your Web Experience
Free
View