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import UIKit

class MyView: UIView {
  fileprivate var myPreviewInteraction: Any? = nil
  
  init() {
    super.init(frame: CGRect.zero)
    
    if #available(iOS 10.0, *) {
      myPreviewInteraction = UIPreviewInteraction(view: self)

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/// Throws error if ALL localizable files does not have matching keys
///
/// - Parameter files: list of localizable files to validate
func validateMatchKeys(_ files: [LocalizationStringsFile]) {
    print("------------ Validating keys match in all localizable files ------------")
    guard let base = files.first, files.count > 1 else { return }
    let files = Array(files.dropFirst())
    files.forEach {
        guard let extraKey = Set(base.keys).symmetricDifference($0.keys).first else { return }
        let incorrectFile = $0.keys.contains(extraKey) ? $0 : base

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extension UIImage {
  func load(image imageName: String) -> UIImage {
    // declare image location
    let imagePath: String = "\(NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])/\(imageName).png"
    let imageUrl: URL = URL(fileURLWithPath: imagePath)

    // check if the image is stored already
    if FileManager.default.fileExists(atPath: imagePath),
       let imageData: Data = try? Data(contentsOf: imageUrl),
       let image: UIImage = UIImage(data: imageData, scale: UIScreen.main.scale) {

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if (resourceIsAvailable) {
  resourceIsAvailable = false
  useResource()
  resourceIsAvailable = true
} else {
  // resource is not available, wait or do something else
}

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let gifts = [ "partridge in a pear tree", "Two turtle doves",       "Three French hens",
              "Four calling birds",       "Five golden rings",      "Six geese a-laying",
              "Seven swans a-swimming",   "Eight maids a-milking",  "Nine ladies dancing",
              "Ten lords a-leaping",      "Eleven pipers piping",   "Twelve drummers drumming" ]

let nth = [ "first",   "second", "third", "fourth", "fifth",    "sixth",
            "seventh", "eighth", "ninth", "tenth",  "eleventh", "twelfth" ]

func gifts(for day: Int) -> String {
  var result = "On the \(nth[day-1]) day of Christmas, my true love sent to me:\n"

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internal func shortestPath(source: Vertex, destination: Vertex) -> Path? {
    var frontier: [Path] = [] {
        didSet {
            frontier.sortInPlace()
        }
    }
    
    var finalPaths: [Path] = [] {
        didSet {
            finalPaths.sortInPlace()

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struct Path: Comparable {
    let cumulativeWeight: Int
    let lastNode: Node
    let previousPath: Path?
  
    init(toNode: Node, viaConnection: Connection?=nil, viaPath: Path?=nil) {
        if let
            previousPath = viaPath,
            lastConnection = viaConnection {
                self.cumulativeWeight = lastConnection.weight + previousPath.cumulativeWeight

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func ==(x: Path, y: Path) -> Bool {
    return x.cumulativeWeight == y.cumulativeWeight
}

func <(x: Path, y: Path) -> Bool {
    return x.cumulativeWeight < y.cumulativeWeight
}

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init(toNode: Node, viaConnection: Connection?=nil, viaPath: Path?=nil) {
    if let
        previousPath = viaPath,
        lastConnection = viaConnection {
            self.cumulativeWeight = lastConnection.weight + previousPath.cumulativeWeight
    } else {
        self.cumulativeWeight = 0
    }
    
    self.lastNode = toNode

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struct Path {
    let cumulativeWeight: Int
    let lastNode: Node
    let previousPath: Path?
}