Protocol
Asked on 06/16/2025
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A protocol in Swift is an abstract set of requirements for a type. It provides a way to define a blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality. A type conforms to a protocol by implementing all of the required methods and properties. Protocols can be used to build abstractions that work equally well with both value and reference types. For example, the Swift standard library uses protocols to abstract over collection types like arrays, dictionaries, and sets.
In the session titled "A Swift Tour: Explore Swift’s features and design," protocols are discussed as a way to build abstractions and are highlighted for their flexibility in working with different types. You can find more about protocols in the A Swift Tour: Explore Swift’s features and design session starting at the "Protocols" chapter.
A Swift Tour: Explore Swift’s features and design
Learn the essential features and design philosophy of the Swift programming language. We’ll explore how to model data, handle errors, use protocols, write concurrent code, and more while building up a Swift package that has a library, an HTTP server, and a command line client. Whether you’re just beginning your Swift journey or have been with us from the start, this talk will help you get the most out of the language.
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