Agent skill · software engineering · thebushidocollective
Swift Protocol-Oriented Programming
Use when protocol-oriented programming in Swift including protocol extensions, default implementations, protocol composition, associated types, and designing flexible, reusable abstractions that favor composition over inheritance.
Why this skill is useful
Provides specific patterns and techniques for protocol-oriented programming in Swift that the AI wouldn't reliably generate on its own.
What it needs
About 9k tokens when loaded. Last updated 2026-07-19. 187 stars on the source repository.
What this skill does
Swift Protocol-Oriented Programming Introduction Protocol-oriented programming (POP) is Swift's paradigm for building flexible, composable abstractions without the rigid hierarchies of class inheritance. Protocols define interfaces that types can adopt, while protocol extensions provide default implementations and capabilities to multiple types simultaneously. This approach offers the flexibility of composition, the performance of static dispatch, and the ability to extend value types like structs and enums. POP is foundational to Swift's standard library and enables powerful patterns for code reuse, testing, and API design. This skill covers protocol design, extensions, associated types, composition, and practical patterns for building protocol-oriented architectures. Protocol Basics and Design Protocols define contracts that types must fulfill, specifying required properties, methods, and initializers without providing implementations. Well-designed protocols are focused and cohesive, defining a single responsibility rather than mixing unrelated requirements. Protocol Extensions Protocol extensions provide default implementations to all adopting types, enabling code reuse without inheritance and retroactive modeling of existing types. Protocol extensions enable retroactive modeling—adding protocol conformance to types you don't own, including standard library types. Associated Types Associated types create generic protocols, allowing conforming types to specify concrete types that satisfy protocol requirements. Associated types enable protocol-based generic programming, providing flexibility while maintaining type safety and performance. Protocol Composition Protocol composition combines multiple protocols into a single requirement, enabling precise type constraints without creating protocol hierarchies. Protocol composition creates precise constraints without the fragility of deep inheritance hierarchies or the overhead of creating new protocols. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills thebushidocollective/swift-protocol-oriented