Unit type as void equivalent in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a function that returns Unit.

Kotlin

fun greet(): [1] {
    println("Hello!")
}

Drag options to blanks, or click blank then click option'

AUnit

Bvoid

CNothing

DInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'void' instead of 'Unit' in Kotlin.

Using 'Nothing' which means the function never returns.

In Kotlin, Unit is used to indicate a function returns no meaningful value, similar to void in other languages.

2fill in blank

medium

Complete the code to define a function with an explicit Unit return type.

Kotlin

fun printMessage(message: String): [1] {
    println(message)
}

Drag options to blanks, or click blank then click option'

AUnit

BInt

CString

DBoolean

Attempts:

3 left

💡 Hint

Common Mistakes

Using a return type like Int or String when the function does not return anything.

Omitting the return type and expecting it to be inferred.

The function explicitly returns Unit, meaning it does not return any meaningful value.

3fill in blank

hard

Fix the error in the function declaration to correctly use the Unit type.

Kotlin

fun showInfo(): [1] {
    println("Info displayed")
}

Drag options to blanks, or click blank then click option'

Avoid

BNothing

CUnit

DAny

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'void' which is not valid in Kotlin.

Using 'Nothing' which means the function never returns.

Kotlin does not have a 'void' type. Use Unit to indicate no meaningful return value.

4fill in blank

hard

Fill both blanks to create a function that returns Unit and prints a message.

Kotlin

fun display(): [1] {
    println([2])
}

Drag options to blanks, or click blank then click option'

AUnit

B"Hello, Kotlin!"

C"Welcome!"

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Using a return type other than Unit.

Printing the wrong message string.

The function returns Unit and prints the message "Hello, Kotlin!".

5fill in blank

hard

Fill all three blanks to define a function that returns Unit, takes a String parameter, and prints it.

Kotlin

fun showMessage(msg: String): [1] {
    println([2])
    return [3]
}

Drag options to blanks, or click blank then click option'

AUnit

Bmsg

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Returning null instead of Unit.

Not printing the parameter correctly.

The function returns Unit, prints the parameter msg, and returns Unit explicitly.