Enum entries iteration in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print all enum entries using a for loop.

Kotlin

enum class Color { RED, GREEN, BLUE }

fun main() {
    for (color in Color.[1]) {
        println(color)
    }
}

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

Avalues()

Bentries()

Call()

Dlist()

Attempts:

3 left

💡 Hint

Common Mistakes

Using entries() which does not exist for enums in Kotlin.

Trying to call all() or list() which are not valid enum functions.

The correct way to iterate over all enum entries in Kotlin is to use the values() function.

2fill in blank

medium

Complete the code to get the number of entries in the enum.

Kotlin

enum class Direction { NORTH, SOUTH, EAST, WEST }

fun main() {
    val count = Direction.[1].size
    println("Number of directions: $count")
}

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Alist()

Ball()

Centries()

Dvalues()

Attempts:

3 left

💡 Hint

Common Mistakes

Using entries() which is not a Kotlin enum function.

Trying to get size directly from the enum class.

The values() function returns an array of all enum entries, so you can get the size from it.

3fill in blank

hard

Fix the error in the code to iterate over enum entries correctly.

Kotlin

enum class Status { ON, OFF }

fun main() {
    for (s in Status.[1]) {
        println(s)
    }
}

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Aall()

Bvalues()

CgetValues()

Dentries

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting parentheses after values.

Using entries or all which are not valid.

The correct function to get all enum entries is values(), with parentheses.

4fill in blank

hard

Fill both blanks to create a map of enum names to their ordinal values.

Kotlin

enum class Level { LOW, MEDIUM, HIGH }

fun main() {
    val map = Level.[1].associateBy([2]) { it.ordinal }
    println(map)
}

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Avalues()

Bname

Cit.name

Dentries()

Attempts:

3 left

💡 Hint

Common Mistakes

Using entries() which is not valid.

Using name instead of it.name inside the lambda.

Use values() to get all entries, and it.name to get the name of each enum entry.

5fill in blank

hard

Fill all three blanks to filter enum entries with ordinal greater than 0 and print their names.

Kotlin

enum class Mode { BASIC, ADVANCED, EXPERT }

fun main() {
    val filtered = Mode.[1].filter { it.ordinal [2] 0 }
    for (m in filtered) {
        println(m[3])
    }
}

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Avalues()

B>

C.name

Dentries()

Attempts:

3 left

💡 Hint

Common Mistakes

Using entries() which is invalid.

Using < instead of > in the filter.

Printing m instead of m.name.

Use values() to get all entries, filter with > 0, and print the name property.