// magic functions to get the CoreData context and entity's instance
let context = getContext()
let entity = getEntity()

// nil out the binary blob, so CoreData erases the file in _EXTERNAL_DATA
entity.setValue(nil, forKey: "image")
context.save()

// then actually save your new blob
entity.setValue(blob, forKey: "image")
context.save()

class GNLOutlineView: NSOutlineView {
  override func makeView(withIdentifier identifier: NSUserInterfaceItemIdentifier, owner: Any?) -> NSView? {

    // intercept disclosure button creation
    if identifier == NSOutlineView.disclosureButtonIdentifier {
      // then create our custom button
      let myView = super.makeView(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "MyDisclosureButton"), owner: owner) as! NSButton
      
      // we need to change the identifier so that the outline view knows to use this view as the disclosure button
      myView.identifier = identifier      
      return myView
    }

    // for everything else, use the default function
    return super.makeView(withIdentifier: identifier, owner: owner)
  }
}

// get the original disclosure button
let originalButton = super.makeView(withIdentifier: identifier, owner: owner) as! NSButton

myView.target = originalButton.target
myView.action = originalButton.action

internal var selectedIndex: AnyObject! {
    didSet {
        let oldIndex = oldValue as? Int
        let newIndex = selectedIndex as? Int
        print("selectedIndex didSet, old: \(oldIndex), new: \(newIndex)")
    }
}

popUpButton.selectItem(at: 2)

// App 1
if let defaults = UserDefaults(suiteName: "com.gietal.sandbox.group") {
    defaults.set(123, forKey: "myKey")
}

// App 2
if let defaults = UserDefaults(suiteName: "com.gietal.sandbox.group") {
    let value = defaults.value(forKey: "myKey")
    print("value: \(value)")
}

// this no longer works
let a: String! = "asd"
let b: String = "asd"
switch a {
case b: // error: expression pattern of type 'String' cannot match values of type 'String!'
    break
default:
    break
}

window.collectionBehavior.remove(.fullScreenPrimary)
window.collectionBehavior.insert(.fullScreenAuxiliary)

public extension FileManager {
  public func foo() throws -> URLRelationship {
    return URLRelationship.other
  }
}

public extension FileManager {
  public func foo() -> URLRelationship {
    return URLRelationship.other
  }
}

let reversed = names.sorted(by: { 
    (s1: String, s2: String) -> Bool in 
    return s1 > s2 
})

let reversed = names.sorted(by: >)