Kotlin Interview Questions and Answers

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Question - What is a motivation to make classes final by default in Kotlin? Do you agree with that decision?

Answer -

First Kotlin takes many ideas from the functional programming world and uses immutability as often as it can to avoid all the known problems with mutation. Also proper designing a class for inheritance requires an excruciating amount of work (and building at least 3 separate subclasses, to verify that you base class actually is useful). Most classes should be final. Extending them is probably a bad idea.

The second thought which comes to my mind is that inheritance is often missused. There is the principle "Favor composition over inheritance" as a guideline for better designs. So declaring every class as final by default forces the developer to at least stop for a moment and think about alternative ways to solve the problem instead of using inheritance for the wrong reasons.

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