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@dynamicMemberLookup
class Person {
  let name: String
  let age: Int
  private let details: [String: String]
  
  init(name: String, age: Int, details: [String: String]) {
    self.name = name
    self.age = age
    self.details = details

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extension NSObjectProtocol where Self: NSObject {
	func observe<Value>(_ keyPath: KeyPath<Self, Value>, onChange: @escaping (Value) -> ()) -> NSKeyValueObservation {
		return observe(keyPath, options: [.initial, .new]) { _, change in
			// TODO: change.newValue should never be `nil`, but when observing an optional property that's set to `nil`, then change.newValue is `nil` instead of `Optional(nil)`. This is the bug report for this: https://bugs.swift.org/browse/SR-6066
			guard let newValue = change.newValue else { return }
			onChange(newValue)
		}
	}

	func bind<Value, Target>(_ sourceKeyPath: KeyPath<Self, Value>, to target: Target, at targetKeyPath: ReferenceWritableKeyPath<Target, Value>) -> NSKeyValueObservation {

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import UIKit
import PlaygroundSupport

enum CoreError: Error, LocalizedError {
    case unknown

    var errorDescription: String? {
        switch self {
        case .unknown:
            return "Unknown error occured"

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import UIKit
import PlaygroundSupport

public class InfinityLoader: UIView {

    let anim = CAAnimationGroup()

    //// Drawing Methods

    lazy var path: UIBezierPath = {

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import Foundation

struct LocationData: Codable {
    var city: String
    var country: String
    var address: String?
}

struct Item: Codable {
    var name: String

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var fetchedResultsProcessingOperations: [NSBlockOperation] = []

private func addFetchedResultsProcessingBlock(processingBlock:(Void)->Void) {
	fetchedResultsProcessingOperations.append(NSBlockOperation(block: processingBlock))
}

func controller(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) {
	
	switch type {
	case .Insert:

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import UIKit
import RxSwift
import RxCocoa
import RxDataSources

class ViewController: BaseCollectionViewController {
    
    ...
    
    typealias Section = AnimatableSectionModel<String, CellStyle>

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#set the shell to /bin/sh
TAGS="TODO:|FIXME:"
find "${SRCROOT}" \( -name "*.swift" \) -type f -print0 | xargs -0 egrep --with-filename --line-number --only-matching "($TAGS).*\$" | perl -p -e "s/($TAGS)/ warning: \$1/"

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import RxSwift

// -- View Model
struct LoginViewModel {

    var username = Variable<String>("")
    var password = Variable<String>("")

    var isValid : Observable<Bool>{
        return Observable.combineLatest( self.username, self.password)

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class MyCustomView : UIView {

    var sink : AnyObserver<SomeComplexStructure> {
        return AnyObserver { [weak self] event in
            switch event {
                case .next(let data):
                    self?.something.text = data.property.text
                    break
                case .error(let error):
                    self?.backgroundColor = .red