curtclifton

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

import UIKit

class VC {
    var dataSource: DataSource?
    
    func viewDidLoad() {
        let items = dataSource?.numberOfItemsIn(section: 9) ?? -1
        print("There are \(items) items")

curtclifton

//
//  NetworkIndicatorManager.swift
//  Indicator
//
//  Created by Curt Clifton on 5/17/16.
//  Copyright © 2016 curtclifton.net. All rights reserved.
//

import Foundation
import UIKit

curtclifton

//: Mutually recursive protocols?

protocol State {
    typealias EventType: Event // error: type may not reference itself as a requirement
    mutating func transitionWithEvent(event: EventType)
}

protocol Event {
    typealias StateType: State // error: type may not reference itself as a requirement
    var action: (StateMachine<StateType, Self>) -> () { get }

curtclifton

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

import UIKit

var str = "Hello, playground"

struct Foo {
    private(set) var bar: String
    let baz: String
    

curtclifton

//: Zippers, based on http://learnyouahaskell.com/zippers

import UIKit

enum FileSystemItem {
    case File(name: String, data: String)
    case Folder(name: String, contents: [FileSystemItem])
    
    var name: String {
        switch self {

curtclifton

import Foundation

// Add a typealias for the child type so different implementors can be specific about the types of their children.
protocol NodeRepresentedObject {
    typealias Child
    var children: [Child]? {get}
}

protocol EmailMessage: NodeRepresentedObject {
}

curtclifton

//
//  JSONShape.swift
//  TypedJSON
//
//  Created by Curt Clifton on 2/7/15.
//  Copyright (c) 2015 curtclifton.net. All rights reserved.
//

import Foundation

curtclifton

protocol Counter {
    var value: Int { get }
    func moveTowardZero()
}

func makeCounterStartingAt(value: Int) -> Counter {
    // Since this class declaration is nested in the generator function, the returned value is only accessible via the Counter protocol
    class CountImplementation: Counter {
        var value: Int