All classes in Kotlin inherit from which superclass?

You have written a function, sort(), that should accept only collections that implement the Comparable interface. How can you restrict the function? fun sort(list: List): List { return list.sorted()}

Kotlin classes are final by default. What does final mean?

You have created an array to hold three strings. When you run the code bellow, the compiler displays an error. Why does the code fail? val names = arrayOf(3) names[3]= "Delta"

If a class has one or more secondary constructors, what must each of them do?

When you can omit constructor keyword from the primary constructor?

This code does not print any output to the console. What is wrong? firstName?.let { println("Greeting $firstname!")}

The function typeChecker receiver a parameter obj of type Any. Based upon the type of obj, it prints different messages for Int, String, Double, and Float types; if not any of the mentioned types, it prints "unknown type". What operator allows you to determine the type of an object?

You are attempting to assign an integer variable to a long variable, but Kotlin compiler flags it as an error. Why?

You have started a long-running coroutine whose job you have assigned to a variable named task. If the need arose, how could you abort the coroutine? val task = launch { // long running job}

You are writing a console app in Kotlin that processes test entered by the user. If the user enters an empty string, the program exits. Which kind of loop would work best for this app? Keep in mind that the loop is entered at least once