LH17

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

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

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

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

LH17

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

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

LH17

// Protocol
protocol Fruit {
    func set(price: String?)
    func clone() -> Fruit
}

// Class Apple which implements the protocol
class Apple: Fruit {
    var count: Int

LH17

precedencegroup UnionOperatorPrecedence {
    associativity: left
    higherThan: IntersectionOperatorPrecedence
}

LH17

precedencegroup IntersectionOperatorPrecedence {
    associativity: left
}

infix operator ∩: IntersectionOperatorPrecedence

func ∩<T: Equatable> (left: [T], right: [T]) -> [T] {
    var intersection: [T] = []
    for value in left {
        if right.contains(value) {

LH17

precedencegroup UnionOperatorPrecedence {
    associativity: left
}

infix operator ∪: UnionOperatorPrecedence

func ∪ <T:Equatable>(lhs: [T], rhs:[T])->[T] {
    var result = lhs
    for element in rhs {
        if !lhs.contains(element) {

LH17

class StateViewController: UIViewController {}

extension StateViewController: ViewStateProtocol {
	@objc func handleTap(_ sender: UIView) {
		// for showing the loader
		addView(withState: .loading)

		// for showing the error message
		addView(withState: .error)

LH17

class StateManager {
  
    static let sharedInstance = StateManager()
    var viewStore: [String: UIView] = [:]
    
    // Associates a view for the given state
    public func addView(_ view: UIView, forState state: String, superview: UIView) {
        viewStore[state] = view
        superview.addSubview(view)
    }