Generating infinite sequences in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an infinite sequence starting from 1.

Kotlin

val numbers = generateSequence([1]) { it + 1 }

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

A-1

B0

Cnull

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Starting from 0 or null will change the sequence start.

The sequence starts from 1, so the initial value must be 1.

2fill in blank

medium

Complete the code to generate an infinite sequence of even numbers starting from 2.

Kotlin

val evens = generateSequence([1]) { it + 2 }

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

A1

B0

C2

D-2

Attempts:

3 left

💡 Hint

Common Mistakes

Starting from 1 or 0 will not produce even numbers.

The sequence of even numbers starts at 2, so the initial value must be 2.

3fill in blank

hard

Fix the error in the code to generate an infinite sequence of odd numbers starting from 1.

Kotlin

val odds = generateSequence([1]) { it + 2 }

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

A0

B1

C2

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 or 2 as the start value will produce even numbers.

The sequence of odd numbers starts at 1, so the initial value must be 1.

4fill in blank

hard

Fill both blanks to generate the infinite sequence 1, 2, 5, 14, 41, … starting from 1.

Kotlin

val squares = generateSequence([1]) { it + [2] }

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

A1

B2

Cit * 2 - 1

Dit + 1

Attempts:

3 left

💡 Hint

Common Mistakes

Using a fixed increment like 2 will not generate the correct sequence.

The sequence starts at 1, and the next value is obtained by adding it * 2 - 1.

5fill in blank

hard

Fill all three blanks to generate an infinite Fibonacci sequence starting from 0 and 1.

Kotlin

val fibs = generateSequence(Pair([1], [2])) { Pair(it.second, it.first [3] it.second) } .map { it.first }

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

A0

B1

C+

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or wrong starting numbers will break the Fibonacci sequence.

The Fibonacci sequence starts with 0 and 1, and each next number is the sum of the previous two.