Chapter 2: Code Missing Under "Implementing a Swift Protocol"

[ccocchiaro]

In Chapter 2 (page 38 of the Extreme Mobile PDF) under "Implementing a Swift Protocol", the code sample should include defining the protocol as well as implementing it. The downloaded code itself is correct, only the book contains the oversight:

import UIKit

protocol DisplayableViewController {
    func instantiateRootViewController(configuration: Dictionary<String, Any>) -> UIViewController
}

public class RecordingsProtocol: DisplayableViewController {
    public init() {}
    
    public func instantiateRootViewController() -> UIViewController {
        let storyboard = UIStoryboard(name: "RecordingsUI", bundle: Bundle(for: RecordingsTVC.self))
        let vc = storyboard.instantiateViewController(withIdentifier: "RecordingsNC")
        return vc
    }
}