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   let arr = [1, 2, 3]
   var iterator = arr.makeIterator()
   while let num = iterator.next() {
      //
   }

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public protocol IteratorProtocol {
  associatedtype Element
  mutating func next() -> Self.Element?
}

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import Foundation
import AVFoundation

protocol AudioRecorder {
  func checkPermission(completion: ((Bool) -> Void)?)
  
  /// if url is nil audio will be stored to default url
  func record(to url: URL?)
  func stopRecording()
  

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func quickSort<T: Comparable>(arr: [T]) -> [T] {
    if arr.count <= 1 {
        return arr
    } else if arr.count == 2 {
        return arr[0] > arr[1] ? [arr[1], arr[0]] : arr
    } else if arr.count == 3 {
        let firstIndex = arr[0] <= arr[1] && arr[0] <= arr[2] ? 0 : arr[1] <= arr[2] ? 1 : 2
        let secondIndex = (arr[0] <= arr[1] && arr[0] >= arr[2]) || (arr[0] >= arr[1] && arr[0] <= arr[2])
            ? 0

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//
//  debounce-throttle.swift
//
//  Created by Bohdan Savych on 19/12/18.
//  License: MIT
//

import Foundation

extension TimeInterval {

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for family in UIFont.familyNames {
    print("\(family)")

    for name in UIFont.fontNames(forFamilyName: family) {
        print("   \(name)")
    }
}

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Copy and paste the swift code below into a playground to experiment.

This is a very close emulation of Functor and Monad typeclasses in swift. However, it is very fragile (i.e. easy to crash the compiler).

For example, instance methods of fmap will run fine, but attempting to use a globally defined fmap that acts on Functor types will cause a crash. Similarly for bind. Unfortunately this means we cannot define the nice infix operator versions of these functions.

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//
//  SideShadowLayer.swift
//  Rolique
//
//  Created by Bohdan Savych on 10/5/17.
//  Copyright © 2017 Rolique. All rights reserved.
//

import UIKit

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//
//  ConstraintsSettings.swift
//  Rolique
//
//  Created by Bohdan Savych on 9/29/17.
//  Copyright © 2017 Rolique. All rights reserved.
//

import UIKit

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import UIKit
import RxSwift
import RxCocoa

let requiredUserNameLength = 5
let requiredPasswordLength = 5

let limitUserNameLength = 20

class ValidationViewController: UIViewController {