Kotlin quiz

Test your Kotlin knowledge with a free interactive quiz — 50 questions with answers and explanations. No signup needed to play.

Which loop iterates over a range of integers `1..10`?

1. Which loop iterates over a range of integers `1..10`?
2. How does Kotlin's `when` differ from Java's `switch`?
3. What does `object MyService { … }` declare?
4. What is a `companion object`?
5. What is an `init` block?
6. What is the `!!` operator?
7. Which auto-generated members does `data class` provide?
8. What is the difference between `val` and `var` in Kotlin?
9. What does the Elvis operator `?:` do?
10. What is the result type of `if/else` used as an expression?
11. What is the difference between `let` and `apply` scope functions?
12. What is an extension function?

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