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About Kotlin

fun getGreeting(): String {
    return "Hello, World!"

88 coding exercises for Kotlin on Exercism. From Hamming to Change.

Get better at programming through fun, rewarding coding exercises that test your understanding of concepts with Exercism.

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Key Features of Kotlin



Kotlin is trying hard to be a modern language with great tooling support.

Statically Typed

Strong type-safety and null-safety features for building robust software.


Kotlin support both functional and mainstream OOP programming principles.

Platform Independent

Develop for Android, iOS, JVM, Node.js, browser and many native targets.

Garbage collected

Kotlin (as a modern generic-purpose language) does memory management for you.


Kotlin is fully open-source. Submit patches or suggest language improvements.

Get mentored the Kotlin way

Every language has its own way of doing things. Kotlin is no different. Our mentors will help you learn to think like a Kotlin developer and how to write idiomatic code in Kotlin. Once you've solved an exercise, submit it to our volunteer team, and they'll give you hints, ideas, and feedback on how to make it feel more like what you'd normally see in Kotlin - they'll help you discover the things you don't know that you don't know.

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Community-sourced Kotlin exercises

The Kotlin track on Exercism has 88 exercises to help you write better code. Discover new exercises as you progress and get engrossed in learning new concepts and improving the way you currently write.

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