let someString:String! = "this is the string";

let someString:String = "this is the string";

class MyView : UIView {
    @IBOutlet var button : UIButton!
    var buttonOriginalWidth : CGFloat!

    override func awakeFromNib() {
        self.buttonOriginalWidth = self.button.frame.size.width
    }
}

override func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell? { return nil }

var image : UIImage? = UIImage(named: "NonExistentImage")
if image != nil {
    println("image exists")
}
else {
    println("image does not exist")
}

class FileSystemItem {
}

class Directory : FileSystemItem {
    lazy var contents : [FileSystemItem] = {
        var loadedContents = [FileSystemItem]()
        // load contents and append to loadedContents
        return loadedContents
    }()
}

// These classes are buddies that never go anywhere without each other
class B {
    var name : String
    weak var myBuddyA : A!
    init(name : String) {
        self.name = name
    }
}

class A {
    var name : String
    var myBuddyB : B
    init(name : String) {
        self.name = name
        myBuddyB = B(name:"(name)'s buddy B")
        myBuddyB.myBuddyA = self
    }
}

var a = A(name:"Big A")
println(a.myBuddyB.name)   // prints "Big A's buddy B"

class MyViewController: UIViewController {

    var screenSize: CGSize?

    override func viewDidLoad {
        super.viewDidLoad()
        screenSize = view.frame.size
    }

    @IBAction printSize(sender: UIButton) {
        println("Screen size: (screenSize!)")
    }
}

if let value = optionalWhichTotallyHasAValue {
     println("(value)")
 } else {
     assert(false)
 }

println("(value!)")