The Optional Data Type

Int, String, UIButton, AnyObject

Exclamation!
declare -var x:Int!
unwrap -x!

let w = Int("123")
w * 2

class BetterViewController: UIViewController {
	//var myButton: UIButton
}

import UIKit

class ViewController: UIViewController {
	var button:UIButton!

	override func viewDidLoad(){
		super.viewDidLoad()
		var title = button.titleForState(UIControlState.Normal)
	}
}

import UIKit

class Beverage {
	var category:String
	init (category: String){
		self.category = category
	}
}

class HotDrink: Beverage {
	var pairing:String

	init(category: String, pairing: String){
		self.pairing = pairing
		super.init(category: category)
	}
}

class ColdDrink: Beverage {
	var vessel:String

	init (category: String, vessel: String){
		self.vessel = vessel
		super.init(category: category)
	}
}