Kotlin Kotlin Basics and Syntax 2

Question 1

How do you write a single-expression function in Kotlin?

Accepted Answer

fun add(a: Int, b: Int) = a + b

Answer

Kotlin allows single-expression functions using the `=` syntax, omitting the curly braces and `return` keyword.

Question 2

What is the output of `'A'.code` in Kotlin?

Accepted Answer

65

Answer

The `.code` property on a `Char` returns its Unicode code point as an `Int`; for 'A' that is 65.

Question 3

Which of the following correctly uses string interpolation in Kotlin?

Accepted Answer

"Hello ${name}"

Answer

Kotlin uses `${}` for string interpolation, embedding expressions directly inside string literals.

Question 4

What does `!!` do in Kotlin?

Accepted Answer

Non-null assertion that throws NullPointerException if null

Answer

The `!!` operator asserts that the value is non-null and throws `KotlinNullPointerException` if the value is null.

Question 5

What is the range of the Kotlin `Byte` type?

Accepted Answer

-128 to 127

Answer

Kotlin's `Byte` type is a signed 8-bit integer with a range of -128 to 127.

Kotlin Practice Test