Swift Interview Questions and Answers

Question 15 : What are Instance properties and type properties in swift?

Answer 15:  Instance properties belong to the instance of a type ,for better understanding one can say that they belong to the object instance of a Class type. With every new instance a new copy of instance properties is made which is a different entity from same property of different instance.

Type properties on other hand are associated with a type they are common to all instance of a type.Type properties are defined using static keyword

class SomeClass {
    static var storedTypeProperty = "Some value."   //type property
    var storedInstanceProperty:String? // instance property   
}

Question 16 : What is defer statement? Why are they used?