Related InterviewSolutions

• class A {     var name:String     init(name:String) {         self.name = name     } } class B:A {     var id : String     init(name:String, id : String){         self.id = id         super.init(name: name)     }     convenience init (id:String) {         super.init(name: "unknown")         self.id = id     } }
• Please look at the code segment below. If we compile it what happens? Explain
• What is the exact difference in the view model in MVVM and controller in MVC? Which pattern is preferable keeping in mind the code unit test coverage?
• Consider a scenario where I have two different system storage which requires IDs in different data types. One system will deal int values only and others in string values only. Create a generic protocol with a single property “ids” ( holds an array of ids) and a function to add id, that will be used for two systems.
• We want to test cover the function of physicsBooks.  Test the logic if it identifies the physics books from different data sets. Redesign this classes to test cover the method.
• enum BookType {     case biology     case physics     case maths     case unknown } class Book {     var name:String?     var type:BookType = .unknown } class BookStorage {         func fetchAllBooks() -> [Book] {             // return all available books         }   } class BooksManager {         func physicsBooks() -> [Book] {             let books = BookStorage().fetchAllBooks()             // identify the physics book and return those             let physicsbooks …             return physicsbooks         } }
• Please consider the following code: (Advanced)
• class Employee4 {     var name:String     var  id:Int     init(name:String, id:Int) {         self.name = name         self.id = id     } } func testAssignment() {     let emp1 = Employee4(name: "Sam", id: 1)     let emp2 = Employee4(name: "John", id: 2)     let emp3 = Employee4(name: "Robert", id: 3)     var employees = [emp1,emp2]     let employees2 = employees     employees[0].name = "Sam Smith"     employees.append(emp3)     for emp in employees2 {         print("name \(emp.name)")     } }
• Please look at the code below. If we run method ., what will be the output and why?
• What is the use of the dump function? Explain with example.