When without argument in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the correct message based on the number using a when expression without argument.

Kotlin

val number = 2
when {
    number == 1 -> println("One")
    number == [1] -> println("Two")
    else -> println("Other")
}

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

A2

B3

C0

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using a value other than 2 in the condition.

Trying to use when with argument syntax here.

The when expression without argument uses conditions. Here, number == 2 matches the second case.

2fill in blank

medium

Complete the code to print the correct message for the character using when without argument.

Kotlin

val ch = 'a'
when {
    ch.isUpperCase() -> println("Uppercase")
    ch == [1] -> println("Lowercase a")
    else -> println("Other")
}

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

A'a'

B'b'

C'z'

D'A'

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase 'A' instead of lowercase 'a'.

Using double quotes instead of single quotes.

The condition checks if ch is equal to lowercase 'a'.

3fill in blank

hard

Fix the error in the when expression without argument to correctly check if the number is positive.

Kotlin

val num = -5
when {
    num [1] 0 -> println("Positive")
    num == 0 -> println("Zero")
    else -> println("Negative")
}

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

A==

B>

C<

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of >.

Using equality operator == incorrectly.

The condition num > 0 checks if the number is positive.

4fill in blank

hard

Fill both blanks to create a when expression without argument that prints if a number is even and positive.

Kotlin

val x = 4
when {
    x [1] 0 && x [2] 2 == 0 -> println("Even and positive")
    else -> println("Other")
}

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

A>

B==

C%

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > for positivity.

Using == instead of % for even check.

The first condition checks if x > 0 (positive), and the second uses x % 2 == 0 to check evenness.

5fill in blank

hard

Fill both blanks to create a when expression without argument that prints if a string is empty, blank, or has content.

Kotlin

val text = "  "
when {
    text.[1]() -> println("Empty")
    text.[2]() -> println("Blank")
    else -> println("Has content")
}

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

AisEmpty

BisBlank

Clength

DisEmptyOrBlank

Attempts:

3 left

💡 Hint

Common Mistakes

Using length() as a function instead of property.

Confusing isEmpty() and isBlank().

isEmpty() checks if the string has zero length, isBlank() checks if it contains only whitespace, and length is not a function but a property, so it is a distractor here.