Explain and apply Go interfaces, type assertions, and embedding.
npx skills add https://github.com/phant-app/phant --skill go-interfaces-phant-app
Please help me install this Agent Skill. Skill: go-interfaces Source: https://github.com/phant-app/phant/tree/main/.agents/skills/go-interfaces Command: npx skills add https://github.com/phant-app/phant --skill go-interfaces-phant-app
Go developers often struggle to design and reason about interfaces, type assertions, and embedding in Go. This skill clarifies how interfaces are satisfied implicitly, how to implement type switches, and how embedding enables composition.
Build a small example that defines an interface, implements it with a concrete type, and demonstrates embedding in a composite type.
High-intent search queries and answers about installing and using this skill.
Type assertions in Go extract the underlying concrete value from an interface, while type switches conditionally execute logic based on the specific runtime type held by the interface variable.
Embedding structs or interfaces in Go promotes their methods and fields to the composite type, enabling code reuse and flexible composition without traditional inheritance hierarchies.
Go requires consistency between pointer and value receivers to ensure method sets align correctly, preventing compilation errors when assigning values or pointers to interface variables.
Use a single type assertion in Go when checking for one specific underlying type, but use a type switch when you need to evaluate multiple potential runtime types within the same interface.
Yes, a single concrete struct in Go can implement multiple interfaces simultaneously if it defines all the methods required across those interfaces, satisfying each one implicitly.
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