Destructuring in collection iteration in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to destructure each pair in the list and print the key.

Kotlin

val pairs = listOf("a" to 1, "b" to 2)
for (([1], value) in pairs) {
    println([1])
}

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

Akey

Bfirst

Citem

Delement

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'key' or 'item' which are not the default names for Pair components.

In Kotlin, when destructuring a Pair, the first element is commonly named 'first'.

2fill in blank

medium

Complete the code to destructure map entries and print both key and value.

Kotlin

val map = mapOf("x" to 10, "y" to 20)
for (([1], value) in map) {
    println("Key: $[1], Value: $value")
}

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

Aentry

Belement

Cindex

Dkey

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'entry' or 'index' which are not valid destructuring names for map entries.

When iterating over a map, destructuring uses 'key' and 'value' to access entries.

3fill in blank

hard

Fix the error in destructuring a list of triples to print all three elements.

Kotlin

val triples = listOf(Triple(1, "a", true), Triple(2, "b", false))
for ((first, [1], third) in triples) {
    println("$first, $[1], $third")
}

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

Asecond

Bmiddle

Cvalue

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'middle' or 'value' which are not valid component names for Triple.

Triple destructuring uses 'first', 'second', and 'third' as component names.

4fill in blank

hard

Fill both blanks to destructure a list of pairs and print their sum.

Kotlin

val pairs = listOf(1 to 2, 3 to 4)
for (([1], [2]) in pairs) {
    println([1] + [2])
}

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

Afirst

Bsecond

Ckey

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'key' and 'value' which are for map entries, not pairs.

Pairs are destructured into 'first' and 'second' components in Kotlin.

5fill in blank

hard

Fill all three blanks to destructure a list of triples and print a formatted string.

Kotlin

val triples = listOf(Triple("John", "Doe", 30), Triple("Jane", "Smith", 25))
for (([1], [2], [3]) in triples) {
    println("Name: $[1] $[2], Age: $[3]")
}

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

Afirst

Blast

Cthird

Dsecond

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'last' instead of 'second' for the middle element.

Triple destructuring uses 'first', 'second', and 'third' to access elements in order.