When expression as powerful switch in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to return the correct day type using a when expression.

Kotlin

fun dayType(day: String): String {
    return when(day) {
        "Saturday", "Sunday" -> [1]
        else -> "Weekday"
    }
}

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

A"Weekend"

B"Holiday"

C"Workday"

D"Funday"

Attempts:

3 left

💡 Hint

Common Mistakes

Returning a wrong string like "Holiday" instead of "Weekend".

The when expression returns "Weekend" for Saturday and Sunday, else "Weekday".

2fill in blank

medium

Complete the code to return the number of letters in the color name using when.

Kotlin

fun colorLength(color: String): Int {
    return when(color) {
        "Red" -> 3
        "Blue" -> 4
        else -> [1]
    }
}

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

Acolor.size

Bcolor.count()

Ccolor.length()

Dcolor.length

Attempts:

3 left

💡 Hint

Common Mistakes

Using color.length() which is invalid in Kotlin.

color.length returns the number of characters in the string color.

3fill in blank

hard

Fix the error in the when expression to correctly match the number 1.

Kotlin

fun numberName(num: Int): String {
    return when(num) {
        [1] -> "One"
        2 -> "Two"
        else -> "Other"
    }
}

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

A"1"

B1

Cone

D'1'

Attempts:

3 left

💡 Hint

Common Mistakes

Using "1" or '1' which are strings or chars, not integers.

The when expression matches the integer 1, so the correct case is 1 without quotes.

4fill in blank

hard

Fill both blanks to return "Positive", "Negative", or "Zero" using when with condition.

Kotlin

fun numberSign(num: Int): String {
    return when {
        num [1] 0 -> "Positive"
        num [2] 0 -> "Negative"
        else -> "Zero"
    }
}

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

A>

B<

C==

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using == for positive or negative checks.

num > 0 means positive, num < 0 means negative, else zero.

5fill in blank

hard

Fill all three blanks to create a when expression that returns the season based on month number.

Kotlin

fun season(month: Int): String {
    return when(month) {
        in 1[1]2 -> "Winter"
        in 3[2]5 -> "Spring"
        in 6[3]8 -> "Summer"
        else -> "Fall"
    }
}

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

A..

Buntil

CrangeTo

DdownTo

Attempts:

3 left

💡 Hint

Common Mistakes

Using until which excludes the end value.

The .. operator creates ranges like 1..2, 3..5, and 6..8 for Winter, Spring, and Summer respectively.