vhart

class SomeDeserializer<T>: JsonDeserializer {
    private let deserializer: JsonDeserializer

    init<D: JsonDeserializer>(deserializer: D) where D.Response == T {
        self.deserializer = deserializer
    }

    func parse(json: [String : Any]) -> T {
        return deserializer.parse(json: json)
    }

vhart

class SomeDeserializer<T, D: JsonDeserializer>: JsonDeserializer {
    private let deserializer: D

    init<D: JsonDeserializer>(deserializer: D) where D.Response == T {
        self.deserializer = deserializer
    }

    func parse(json: [String : Any]) -> T {
        return deserializer.parse(json: json)
    }

vhart

class BaseJsonDeserializer<T>: JsonDeserializer {
    init() {
        guard type(of: self) != BaseJsonDeserializer.self
            else { fatalError("do not initialize this abstract class directly") }
    }

    func parse(json: [String : Any]) -> T {
        fatalError("Abstract class. Subclass must override")
    }
}

vhart

public enum Result<T, E: Error> {
    case success(T)
    case failure(E)
}

public enum NetworkError: Error {
    case invalidJson
    case badRequest
    case timeout
}

vhart

class IdentifiableDispatchQueue {
    let key = DispatchSpecificKey<UUID>()
    let id = UUID()

    let queue: DispatchQueue

    convenience init(label: String) {
        let queue = DispatchQueue(label: label)

        self.init(queue: queue)

vhart

import android.support.test.espresso.ViewAction
import android.support.test.espresso.ViewInteraction
import android.support.test.espresso.action.CoordinatesProvider
import android.support.test.espresso.UiController
import android.view.InputDevice
import android.view.MotionEvent
import android.os.SystemClock

class MultiTouchDownEvent : ViewAction {

vhart

//: Playground - noun: a place where people can play

import UIKit
import PlaygroundSupport

func setUpDemo() {
    let testContents = """
        This is a test
        Emojis follow:
        🚀

vhart

import UIKit

class ChatCell: UITableViewCell {
    lazy var iconImageView: UIImageView = {
        let imageView = UIImageView()
        let icon = UIImage(named: "icons8-Sheep on Bike")
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.backgroundColor = .clear
        imageView.layer.cornerRadius = 25
        imageView.contentMode = .scaleAspectFit

vhart

import UIKit

class PermaColorView: UIView {
    var color: UIColor = .clear {
        didSet {
            backgroundColor = color
        }
    }

    override var backgroundColor: UIColor? {

vhart

struct Filter<Object> {

    let path: PartialKeyPath<Object>
    let matcher: (Any) -> Bool

    init<Type>(keyPath: KeyPath<Object, Type>, matcher: @escaping (Type) -> Bool) {
        self.path = keyPath
        self.matcher = { value in
            guard let typedValue = value as? Type else { return false }
            return matcher(typedValue)