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Protocol function that returns the Self type


We may find situations in which we want a protocol function to return the current type, here the metatype Self can come in handy. In these situations rather than just returning the protocol type, we likely want to return the type that conforms to the protocol. An associated type can be added to the protocol that defaults to Self to achieve this. Pretty handy!

protocol ChatThreadsRobot {
    associatedtype ChatThreadsType: ChatThreadsRobot = Self

    func tapCreateThread() -> ChatThreadsType

extension ConnectionThreadsRobot: ChatThreadsRobot {
    func tapCreateThread() -> ConnectionThreadsRobot {
        return self

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Andrew Lord

A software developer and tech leader from the UK. Writing articles that focus on all aspects of Android and iOS development using Kotlin and Swift.

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