Hello people! I'm new with xCode - Swift and I wonder where I can find the explanations about the correct use of the functions or methods that are described in the documentation. For example, if I see the next: var rootViewController: UIViewController? { get set } or: func performSegue(withIdentifier identifier: String, sender: Any?) I'm seeing this functions in the documentation but I cannot understand how implement them, is there some documentation with examples and more detailed explanations? Thank you all. Ernesto Reides.

Hello people, I'm new in Swift and Xcode, I'm learning and until now everything is okay and fantastic, however I have an issue with the next exercise. Lab - Enumerations.playground-App Exercise - Swimming Workouts In the last part of the exercise is written the next: Inside save() write a switch statement that switches on the instance's stroke property, and appends self to the proper array. I don't understand what means "appends self to the proper array", I tried everything and can not found the solution, someone can explain in more detail what this mean? Thank you all in advance. Ernesto.