iThinker

protocol DomainEvent {
    
    typealias Subscription = (Self) -> Void
    
    static var notificationName: Notification.Name { get }
    
}

let DomainEventKey = "DomainEventKey"

iThinker

    class TrackSelectionStrategy {

        static let straight: TrackSelectionStrategy = Straight()
        static let shuffle: TrackSelectionStrategy = Shuffle()

        fileprivate init() {}

        func nextItem(_ sender: AudioPlayerImpl) -> AudioPlayerItem? {
            return self.nextItemIndex(sender).map({ sender._items[$0] })
        }

iThinker

class Trulean<T> {
    class Empty: Trulean<T> {
        override func onFalse(_ eval: @autoclosure () throws -> T) rethrows -> T {
            return try eval()
        }
    }

    class Full: Trulean<T> {
        let _value: T

iThinker

class LinkedList<T>: Collection {

    typealias Element = T
    typealias Index = Int
    typealias Iterator = IteratorImpl
    
    final class IteratorImpl: IteratorProtocol {
        typealias Element = T
        
        private var cursor: Node?

iThinker

import UIKit

class PathBuilder {
    private var components: [String] = []
    private var pathBase: String
    
    init(pathBase: String) {
        self.pathBase = pathBase
    }