> > >

Swift MCQs

Swift Generics & Upcasting

class Fruit {} class Apple: Fruit {} class Orange: Fruit {} class Basket<T: Fruit> { private var items: [T] func add(item: T) { items.append(item) } init() {} } func addItem<T: Fruit>(var basket: Basket<T>, item: T) { basket.add(item) } let basket:Basket<Apple> = Basket() addItem(basket as Basket<Fruit>, Orange())

class Foo { } class Thing<T: Foo> { func produceBar() -> Bar { return Bar(aThing: self as! Thing<Foo>) } } class Bar { var thing: Thing<Foo> init(var aThing: Thing<Foo>) { self.thing = aThing } }

func addItem<T: Fruit>(var basket: Basket<T>, item: T) { basket.add(item) } let basket:Basket<Apple> = Basket() addItems(basket as Basket<Fruit>, Orange())

class Foo { } class Thing<T: Foo> { func produceBar() -> Bar { add Bar(aThing: self as! Thing<Foo>) } } class Bar { var thing: Thing<Foo> init(var aThing: Thing<Foo>) { blank.thing = aThing } }

Answer

Correct Answer: class Fruit {} class Apple: Fruit {} class Orange: Fruit {} class Basket<T: Fruit> { private var items: [T] func add(item: T) { items.append(item) } init() {} } func addItem<T: Fruit>(var basket: Basket<T>, item: T) { basket.add(item) } let basket:Basket<Apple> = Basket() addItem(basket as Basket<Fruit>, Orange())

Explanation:

Note: This Question is unanswered, help us to find answer for this one

Swift Skill Assessment

Your Skill Level: Poor

Retake Quizzes to improve it