LH17

// Protocol
protocol Fruit {
    func getPrice() -> String
    func getCount() -> Int
}

// Implements Fruit Protocol
class Orange: Fruit {
    func getPrice() -> String {

LH17

// Abstract Factory
protocol FurnitureFactory {
    static func createTable() -> Table
    static func createChair() -> Chair
}

// Abstract product Table
protocol Table {
    func count() -> Int

LH17

// protocol  for creating a product
protocol ShoeShop {
    func produceShoe()
}

// class that conforms to ShoeShop protocol
class Nike: ShoeShop {
    func produceShoe() {
        print("Shoe Produced")

LH17

// Singleton class Vehicle
class Vehicle {
    static let sharedInstance = Vehicle()
    // private initialser
    private init() {}
    
    func getName() -> String {
        return "Car"
    }

LH17

enum Level: Int {
    case state = 1
    case national = 2
    case international = 3
}

class Sports {
    var level: Level
    

LH17

protocol Command {
    func execute()
}

class ConcreteCommand: Command {
    var colorReceiver: ColorReceiver
    
    init(colorReceiver: ColorReceiver) {
        self.colorReceiver = colorReceiver

LH17

struct MyBestFilms: Sequence {
    let films: [String]
    
    func makeIterator() -> MyBestFilmsIterator {
        return MyBestFilmsIterator(films)
    }
}

struct MyBestFilmsIterator: IteratorProtocol {

LH17

protocol Receiver {
    var name: String { get }
    func receive(message: String)
}

protocol Sender {
    var teams: [Receiver] { get set }
    func send(message: String, sender: Receiver)
}

LH17

import UIKit

typealias MementoType = [String: Any]

protocol Memento: class {
    var key: String  { get set }
    var state: MementoType { get set }
    
    func save()

LH17

protocol Observable {
    func add(customer: Observer)
    func remove(customer : Observer)
    func notify()
}

protocol Observer {
    var id: Int { get set }
    func update()