sssbohdan

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

import Foundation

extension TimeInterval {

sssbohdan

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.

sssbohdan

import UIKit
import RxSwift
import RxCocoa

let requiredUserNameLength = 5
let requiredPasswordLength = 5

let limitUserNameLength = 20

class ValidationViewController: UIViewController {

sssbohdan

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

sssbohdan

//MARK: From https://mikeash.com/pyblog/friday-qa-2015-11-20-covariance-and-contravariance.html

import UIKit

//MARK: TYPE VARIANCE LESSON

//First we explore supertypes and subtypes

class Thing {}
class Vehicle: Thing {}

sssbohdan

UIFont: family Thonburi
UIFont:   font Thonburi-Bold
UIFont:   font Thonburi
UIFont:   font Thonburi-Light
UIFont: family Khmer Sangam MN
UIFont:   font KhmerSangamMN
UIFont: family Snell Roundhand
UIFont:   font SnellRoundhand-Black
UIFont:   font SnellRoundhand-Bold
UIFont:   font SnellRoundhand

sssbohdan

#import <Contacts/Contacts.h>

@implementation ContactsScan

- (void) contactScan
{
    if ([CNContactStore class]) {
        //ios9 or later
        CNEntityType entityType = CNEntityTypeContacts;
        if( [CNContactStore authorizationStatusForEntityType:entityType] == CNAuthorizationStatusNotDetermined)