Question 1

True or false: Kotlin was first released in 2016, but its first stable version was in 2011.

Accepted Answer

False. Kotlin's first stable release (1.0) was in February 2016. It was first announced in 2011 but remained in development until then.

Question 2

True or false: Kotlin was named after Kotlin Island, near St. Petersburg, Russia.

Accepted Answer

True. JetBrains named Kotlin after Kotlin Island in the Gulf of Finland, continuing a tradition of using island names for their projects.

Question 3

True or false: The Elvis operator `?:` in Kotlin is named after Elvis Presley's hairstyle.

Accepted Answer

True. The operator's sideways resemblance to Elvis Presley's quiff (?:) inspired the name. It returns the left side unless null, then the right.

Question 4

True or false: Kotlin/Native can compile to WebAssembly, but not to iOS binaries.

Accepted Answer

False. Kotlin/Native compiles to native binaries for iOS, macOS, Linux, and WebAssembly, among other targets. iOS is one of its primary uses.

Question 5

True or false: Kotlin's coroutines are based on Java's native threads for concurrency.

Accepted Answer

False. Kotlin coroutines are lightweight, user-mode threads that use suspension, not OS threads. They're far more efficient than Java threads for async tasks.

Question 6

True or false: Kotlin's `when` expression can be used without arguments as a cleaner if-else chain.

Accepted Answer

True. `when {}` without an argument acts like a switch on boolean conditions, making complex if-else chains more readable and concise.

Question 7

True or false: Kotlin allows you to override `val` properties with `var` in subclasses.

Accepted Answer

False. You cannot override a `val` with a `var` because that would break immutability guarantees. Only `open val` can be overridden by another `val`.

Question 8

True or false: Kotlin's type system does not support union types like TypeScript does.

Accepted Answer

True. Kotlin lacks native union types; it uses sealed classes and `when` expressions to model similar behavior, but not as first-class union types.

Kotlin Trivia Questions