Kotlin Kotlin Basics 3

Question 1

Which range expression creates an inclusive range from 1 to 10 in Kotlin?

Accepted Answer

1..10

Answer

The `..` operator creates an inclusive range, so `1..10` includes both 1 and 10.

Question 2

What is the result of `"Hello" + 42` in Kotlin?

Accepted Answer

Hello42

Answer

Kotlin converts the integer to a string and concatenates it, producing "Hello42".

Question 3

How do you check if a variable is of a specific type in Kotlin?

Accepted Answer

is

Answer

The `is` operator in Kotlin checks whether an expression is an instance of a given type, similar to Java's `instanceof`.

Question 4

What is smart casting in Kotlin?

Accepted Answer

Automatic type casting after an `is` check

Answer

After a successful `is` type check, Kotlin automatically casts the variable to the checked type without an explicit cast.

Question 5

What does `Unit` represent in Kotlin?

Accepted Answer

The absence of a meaningful return value, similar to Java's void

Answer

`Unit` in Kotlin corresponds to Java's `void`, indicating that a function does not return a meaningful value.

Kotlin Practice Test