#Swiftlang pub quiz: identify the file that will crash; bonus points if you can identify the most memory-friendly file.

Code File 1

import UIKit

class ViewController: UIViewController {
    var a:Foo? = Foo()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        var b = a!.myFunc
        a = nil
        println(b())
    }


}

class Foo {
    var bzz = "bzz"
    lazy var myFunc:()->() = {print(self.bzz)}
    
    var szz:String?  {
        return self.bzz
    }
    
    deinit {
        println("deinit \(bzz)")
    }
    
}

Code File 2

import UIKit

class ViewController: UIViewController {
    var a:Foo? = Foo()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        var b = a!.myFunc
        a = nil
        println(b())
    }

}

class Foo {
    var bzz = "bzz"
    lazy var myFunc:()->() = {[unowned self] in print(self.bzz)}
    
    var szz:String?  {
        return self.bzz
    }
    
    deinit {
        println("deinit \(bzz)")
    }
    
}

Code File 3

import UIKit

class ViewController: UIViewController {
    var a:Foo? = Foo()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        var b = a!.myFunc
        println(b())
        a = nil
    }

}

class Foo {
    var bzz = "bzz"
    lazy var myFunc:()->() = {[unowned self] in print(self.bzz)}
    
    var szz:String?  {
        return self.bzz
    }
    
    deinit {
        println("deinit \(bzz)")
    }
    
}