How to check if an object is an instance of a certain type in Swift?

Hi! I started learning Swift and ran into a problem. I have a class hierarchy: a base class `Vehicle` and two subclasses `Car` and `Bicycle`. I create an array of type `[Vehicle]` containing different instances. Now I need to iterate through the array and perform different actions depending on the specific type of the object. For example, for `Car` print the number of doors, and for `Bicycle` print the number of gears. In Objective-C I would use `isKindOfClass:`, but this doesn't work in Swift. I tried writing like this: ```swift class Vehicle { var name: String init(name: String) { self.name = name } } class Car: Vehicle { var doors: Int init(name: String, doors: Int) { self.doors = doors super.init(name: name) } } class Bicycle: Vehicl