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

fun add(a: Int, b: Int) { return a + b }

Answer

fun add(a: Int, b: Int) -> a + b

Answer

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

Question 2

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

Accepted Answer

65

Answer

A

Answer

1

Answer

Char

Question 3

Which of the following correctly uses string interpolation in Kotlin?

Accepted Answer

"Hello ${name}"

Answer

"Hello " + name

Answer

"Hello #name"

Answer

f"Hello {name}"

Question 4

What does `!!` do in Kotlin?

Accepted Answer

Non-null assertion that throws NullPointerException if null

Answer

Safe call on nullable

Answer

Double negation operator

Answer

Checks if a value is not null

Question 5

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

Accepted Answer

-128 to 127

Answer

0 to 255

Answer

-256 to 255

Answer

-32768 to 32767

Question 6

Which Kotlin keyword is equivalent to Java's `instanceof`?

Accepted Answer

is

Answer

typeof

Answer

as

Answer

instanceof