nixzhu

import Foundation

typealias CancelableTask = (cancel: Bool) -> Void

func delay(time: NSTimeInterval, work: dispatch_block_t) -> CancelableTask? {

    var finalTask: CancelableTask?

    var cancelableTask: CancelableTask = { cancel in
        if cancel {

nixzhu

import UIKit

extension UIDevice {

    enum ScreenModel {
        case Classic
        case Bigger
        case BiggerPlus
    }

nixzhu

import PlaygroundSupport
import SwiftUI

struct DetailView: View {
  @Environment(\.isPresented) var isPresented: Binding<Bool>?
  @State var count = 0

  var body: some View {
    VStack(spacing: 20) {
      Text("Count: \(count)")

nixzhu

struct StateMachine<State, Action> {
  private(set) var state: State
  private let transition: (State, Action) -> State?

  init(startState: State, transition: @escaping (State, Action) -> State?) {
    self.state = startState
    self.transition = transition
  }

  mutating func apply(action: Action) -> Bool {