Terminal operations trigger execution in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to trigger execution of the sequence with a terminal operation.

Kotlin

val numbers = sequenceOf(1, 2, 3, 4)
numbers.[1]()

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AtoList

Bmap

Cfilter

Dtake

Attempts:

3 left

💡 Hint

Common Mistakes

Using intermediate operations like map or filter which do not trigger execution.

The toList() function is a terminal operation that triggers the execution of the sequence and collects the results into a list.

2fill in blank

medium

Complete the code to print the first element of the sequence, triggering execution.

Kotlin

val seq = sequenceOf("a", "b", "c")
println(seq.[1]())

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Afirst

Bmap

Cfilter

Ddrop

Attempts:

3 left

💡 Hint

Common Mistakes

Using intermediate operations like map or filter which do not trigger execution.

The first() function is a terminal operation that triggers execution and returns the first element.

3fill in blank

hard

Fix the error in the code by choosing the correct terminal operation to trigger execution.

Kotlin

val seq = sequenceOf(10, 20, 30)
val sum = seq.[1] { acc, i -> acc + i }

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Amap

Breduce

Cfilter

Dtake

Attempts:

3 left

💡 Hint

Common Mistakes

Using intermediate operations like map or filter which do not trigger execution.

The reduce function is a terminal operation that aggregates the sequence elements and triggers execution.

4fill in blank

hard

Fill both blanks to collect even numbers from the sequence into a list, triggering execution.

Kotlin

val seq = sequenceOf(1, 2, 3, 4, 5)
val evens = seq.[1] { it % 2 == 0 }.[2]()

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Afilter

Bmap

CtoList

Dtake

Attempts:

3 left

💡 Hint

Common Mistakes

Using only intermediate operations without a terminal operation.

filter selects even numbers (intermediate operation), and toList collects them into a list (terminal operation) triggering execution.

5fill in blank

hard

Fill all three blanks to transform, filter, and collect sequence elements, triggering execution.

Kotlin

val seq = sequenceOf("apple", "banana", "cherry")
val result = seq.[1] { it.length }.[2] { it > 5 }.[3]()

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

Amap

Bfilter

CtoList

Dtake

Attempts:

3 left

💡 Hint

Common Mistakes

Using terminal operations too early, or missing the terminal operation.

map transforms strings to their lengths, filter selects lengths greater than 5, and toList collects results, triggering execution.