Kotlin Design Patterns and Best Practices - Third Edition

Assessments

Chapter 1, Getting Started with Kotlin

Question 1

What’s the difference between var and val in Kotlin?

Answer

The val keyword is used to declare an immutable reference, which means the value it holds cannot be changed once it’s assigned. On the other hand, the var keyword declares a mutable reference, allowing the value it holds to be reassigned multiple times.

Question 2

How do you extend a class in Kotlin?

Answer

To extend a class, you specify a colon followed by the superclass name and its constructor. If the superclass is a regular class, it must be declared as open, as, by default, Kotlin classes are final and cannot be extended unless explicitly allowed using the open keyword.

Question 3

How do you add functionality to a