Generating infinite sequences in Kotlin - Mini Project: Build & Apply

Generating infinite sequences

📖 Scenario: Imagine you want to create a never-ending list of numbers that you can use one by one, like counting forever. This is useful when you want to generate numbers on demand without storing them all at once.

🎯 Goal: You will build a Kotlin program that creates an infinite sequence of numbers starting from 1 and then prints the first 10 numbers from it.

📋 What You'll Learn

Create an infinite sequence starting at 1

Use a variable to hold the starting number

Generate the sequence using Kotlin's generateSequence function

Print the first 10 numbers from the sequence

💡 Why This Matters

🌍 Real World

Infinite sequences help when you want to generate data on demand without using too much memory, like counting events or generating IDs.

💼 Career

Understanding sequences and lazy evaluation is useful for jobs involving data streams, reactive programming, or efficient data processing.

1

Create the starting number

Create a variable called start and set it to 1.

Kotlin

// Create a variable called start and set it to 1
// Your code here

Need a hint?

Use val to create a variable that does not change.

2

Create an infinite sequence starting from start

Create a variable called numbers and assign it an infinite sequence starting from start using generateSequence that adds 1 to the previous number.

Kotlin

val start = 1
// Create an infinite sequence called numbers starting from start
// Your code here

Need a hint?

Use generateSequence(start) { it + 1 } to create the sequence.

3

Take the first 10 numbers from the sequence

Create a variable called firstTen and assign it the first 10 numbers from numbers using the take(10) function.

Kotlin

val start = 1
val numbers = generateSequence(start) { it + 1 }
// Take the first 10 numbers from numbers and assign to firstTen
// Your code here

Need a hint?

Use take(10) to get the first 10 items from the sequence.

4

Print the first 10 numbers

Use println to print firstTen.toList() so the numbers show as a list.

Kotlin

val start = 1
val numbers = generateSequence(start) { it + 1 }
val firstTen = numbers.take(10)
// Print the firstTen list
// Your code here

Need a hint?

Convert the sequence to a list before printing to see all numbers.