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No personal data shared with us will be given to any third party, under any circumstances. Your data will also never be used by us for any purpose without specific permission.

The app engages in no ad targeting, data mining, or other activities that may compromise your privacy, and we do not affiliate ourselves with any third parties that do so.

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import Cocoa
import CoreImage
import CoreImage.CIFilterBuiltins

let nextButtonImage = NSImage(named: "next button")!
let startGameButtonImage = NSImage(named: "start game button")!

computeImageDifference(inputImage: nextButtonImage, inputImage2: startGameButtonImage)

// MARK: -

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import UIKit

class MyViewController: UIViewController {
  var name: String = "" {
    didSet {
      print("name = \(name)")
      testLabel.text = name // 2
    }
  }

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  // Put this in a UITableViewCell or UICollectionViewCell subclass.
  // Returns nil if point is not within the specified subviews.
  override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
    let subviews = [imageView, titleLabel, detailLabel, downloadButton]
    for view in subviews {
      if view.convert(view.bounds, to: self).contains(point) {
        return super.hitTest(point, with: event)
      }
    }
    return nil

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  let layout = UICollectionViewCompositionalLayout(sectionProvider: {
    (sectionIndex: Int, layoutEnvironment: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection? in

    let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
                                          heightDimension: .estimated(30))
    let item = NSCollectionLayoutItem(layoutSize: itemSize)

    let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
                                           heightDimension: .estimated(30))

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  let layout = UICollectionViewCompositionalLayout(sectionProvider: {
    (sectionIndex: Int, layoutEnvironment: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection? in

    let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
                                          heightDimension: .fractionalHeight(1.0))
    let item = NSCollectionLayoutItem(layoutSize: itemSize)

    // (1) setting widthDimension to half of collectionView size
    let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(0.5),
                                           heightDimension: .absolute(50))

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import Foundation

class APIClient {

  // 1 - Error enum
  enum APIClientError: Error {
    case dataTaskFailed(Error)
    case noHTTPURLResponse
    case badHTTPStatusCode(HTTPURLResponse)
    case noData

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import Foundation
import UIKit

// From an example view hierarchy...
// 1 -> 2 -> 3 -> 4 -> 5
//      |
//      ---> 6
// Find the least common ancestor of 2 views.

// Input

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find /Applications -name "*.app" -user old-user -maxdepth 1 | tr \\n \\0 | xargs -0 sudo chown -R $USER

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import Foundation

// Allows defining CodingKey from String
struct DynamicCodingKey: CodingKey {
  var intValue: Int?
  var stringValue: String

  init?(intValue: Int) {
    assertionFailure("Not implemented")
    return nil