For when you know you're gonna get to something, but right now you have other priorities. This lets incomplete code compile, so you can get to what really matters at this moment.
import UIKit
public class MyViewController: UIViewController {
    
    public var value: Int
    
    
    init(initialValue: Int) {
        self.value = initialValue
        super.init(nibName: nil, bundle: nil)
    }
    
    
    init(coder: NSCoder) {
        TODO("Eventually this should be codable")
    }
}