Sebastian Boldt SebastianBoldt

## Operators.swift
fileprivate func < <T : Comparable>(lhs: T?, rhs: T?) -> Bool {
  switch (lhs, rhs) {
  case let (l?, r?):
    return l < r
  case (nil, _?):
    return true
  default:
    return false
  }
}

## optional_switch.swift
// Won't work
let x: String? = nil
let y: String? = "Hello Optional"
switch (x,y) {
   case .some(let a),.some(let b): print("Optional has an value of \(unwrappedX)")
   case .none: print("nothing stored inside the enum")
}

## switch_optional.swift
let x: String? = "Hello Optional"
switch x {
  case .some(let value): print("Optional has an value of \(value)")
  case .none: print("nothing stored inside the enum")
}

## optional-pattern.swift
let x: String? = "Hello Optional"
let y: String? = "Hello Optional"
switch (x,y) {
    case let (x?,y?): print("Values: \(x) & \(y)")
    default: print("Error")
}

## multicast.swift
import Foundation

internal final class MulticastDelegate<T> {
	private var delegates = [Weak]()

	func add(_ delegate: T) {
		if Mirror(reflecting: delegate).subjectType is AnyClass {
			let weakValue = Weak(value: delegate as AnyObject)
			guard delegates.index(of: weakValue) == nil else {
				return

## modalPresentationStyles.csv

          
            UIModalPresentationStyle
             iPhone
             iPad

            
              .fullScreen
               YES
               YES

            
              .pageSheet
               YES
               NO

            
              .formSheet
               YES
               NO

            
              .currentContext
               YES
               YES

            
              .custom
               NO
               NO

            
              .overFullScreen
               NO
               NO

            
              .overCurrentContext
               NO
               NO

            
              .blurOverFullScreen
               only on tvOS - N/A
               N/A

            
              .popover
               YES
               NO

## CellProvider.swift
let cellProvider: (UICollectionView, IndexPath, Item) -> UICollectionViewCell? = { collectionView, indexPath, item in
  let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
  cell.backgroundColor = item.color
  return cell
}

## DiffableDataSource_DataModels.swift
enum Section {
  case section1
  case section2
}

struct Item: Hashable {
  let name: String
}

## ViewController.swift
class ViewController: UIViewController {
    @IBOutlet var collectionview: UICollectionView!
    override func viewDidLoad() {
       super.viewDidLoad()
    }
}

## DataSource.swift
class ViewController: UIViewController {
    @IBOutlet var collectionview: UICollectionView!
    lazy var dataSource = UICollectionViewDiffableDataSource<Section, Item>(collectionView: self.collectionview,
                                                                            cellProvider: self.cellProvider)
    lazy var cellProvider: (UICollectionView, IndexPath, Item) -> UICollectionViewCell? = { collectionView, indexPath, item in
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
        cell.backgroundColor = item.color
        return cell
    }
	fileprivate func < <T : Comparable>(lhs: T?, rhs: T?) -> Bool {
	switch (lhs, rhs) {
	case let (l?, r?):
	return l < r
	case (nil, _?):
	return true
	default:
	return false
	}
	}
	// Won't work
	let x: String? = nil
	let y: String? = "Hello Optional"
	switch (x,y) {
	case .some(let a),.some(let b): print("Optional has an value of \(unwrappedX)")
	case .none: print("nothing stored inside the enum")
	}
	let x: String? = "Hello Optional"
	switch x {
	case .some(let value): print("Optional has an value of \(value)")
	case .none: print("nothing stored inside the enum")
	}
	import Foundation

	internal final class MulticastDelegate<T> {
	private var delegates = [Weak]()

	func add(_ delegate: T) {
	if Mirror(reflecting: delegate).subjectType is AnyClass {
	let weakValue = Weak(value: delegate as AnyObject)
	guard delegates.index(of: weakValue) == nil else {
	return
UIModalPresentationStyle	iPhone	iPad
.fullScreen	YES	YES
.pageSheet	YES	NO
.formSheet	YES	NO
.currentContext	YES	YES
.custom	NO	NO
.overFullScreen	NO	NO
.overCurrentContext	NO	NO
.blurOverFullScreen	only on tvOS - N/A	N/A
.popover	YES	NO
	let cellProvider: (UICollectionView, IndexPath, Item) -> UICollectionViewCell? = { collectionView, indexPath, item in
	let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
	cell.backgroundColor = item.color
	return cell
	}
	enum Section {
	case section1
	case section2
	}

	struct Item: Hashable {
	let name: String
	}
	class ViewController: UIViewController {
	@IBOutlet var collectionview: UICollectionView!
	override func viewDidLoad() {
	super.viewDidLoad()
	}
	}
	class ViewController: UIViewController {
	@IBOutlet var collectionview: UICollectionView!
	lazy var dataSource = UICollectionViewDiffableDataSource<Section, Item>(collectionView: self.collectionview,
	cellProvider: self.cellProvider)
	lazy var cellProvider: (UICollectionView, IndexPath, Item) -> UICollectionViewCell? = { collectionView, indexPath, item in
	let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
	cell.backgroundColor = item.color
	return cell
	}