Why should I 'accept interfaces and return structs'?

This is a core Go philosophy covered by the skill; it maximizes flexibility for the caller by not forcing a specific implementation while providing a clear concrete type for the return value.

How does this skill help with Go testing?

It provides patterns for dependency injection and mock implementations, allowing you to isolate components and write more effective unit tests by defining clear behavioral contracts.

What design patterns are included?

The skill covers several structural and behavioral patterns including Strategy, Adapter, and the Fluent Builder pattern, all tailored for Go's interface system.

Does it explain nil interface issues?

Yes, it specifically addresses the 'nil interface vs nil pointer' pitfall, explaining why an interface containing a nil pointer is not itself nil.

Does it cover the 'any' type in Go?

Yes, it includes guidance on using the empty interface (interface{}) and the modern 'any' syntax introduced in Go 1.18, including type assertions and switches.

Go Interface Patterns & Design

Name: Go Interface Patterns & Design
Author: TheBushidoCollective

byTheBushidoCollective

•

API Development

Master Go's interface system to create decoupled, flexible, and testable software architectures using implicit implementation.

This skill empowers Claude with comprehensive knowledge of Go's unique interface system, enabling the design of robust APIs through duck typing and composition patterns. It provides actionable guidance on implementing structural design patterns like Strategy, Adapter, and Fluent Builders while emphasizing Go-specific best practices such as keeping interfaces small and accepting interfaces while returning concrete structs. Whether you are refactoring legacy code for better testability or architecting a new service from scratch, this skill ensures your abstractions are idiomatic, maintainable, and highly decoupled.

Key Features

01Idiomatic guidance on implicit interface implementation and duck typing

0239 GitHub stars

03Techniques for interface composition to build flexible API abstractions

04Best practices for dependency injection and mocking in test environments

05Structural pattern templates including Strategy, Adapter, and Builder

06Detailed troubleshooting for common pitfalls like nil interface comparisons

Use Cases

01Designing decoupled service layers and API contracts in Go applications

02Implementing unit tests with mock repositories using dependency injection

03Refactoring monolithic components into modular, interface-driven systems

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add thebushidocollective/han go-interfaces

For use in Claude.ai and ChatGPT

Download Skill