StateReducer

public protocol StateReducer

Generic State Machine Type

  • Events are effectful inputs from the outside world which the state reacts to, described by some data type. For instance: a button being clicked, or some network data arriving.

    Declaration

    Swift

    associatedtype InputEvent

  • Commands are effectful outputs which the state desires to have performed on the outside world. For instance: showing an alert, transitioning to some different UI, etc.

    Declaration

    Swift

    associatedtype OutputCommand

  • In response to an event, a state may transition to some new value, and it may emit a command.

    Declaration

    Swift

    mutating func handleEvent(event: InputEvent) -> OutputCommand

  • State machines must specify an initial value.

    Declaration

    Swift

    static var initialState: Self { get }