Welcome to our tour of Kotlin! | Kotlin

Quickly learn the essentials of the Kotlin programming language through our tours, which will take you from beginner to intermediate level. Each chapter contains:

• Theory to introduce key concepts of the language with examples.

• Practice with exercises to test your understanding of what you have learned.

• Solutions for your reference.

Start with our beginner tour to grasp the fundamentals:

Beginner tour contents

• Variables

• Basic types

• Collections

• Control flow

• Functions

• Classes

• Null safety

If you're ready to take your understanding of Kotlin to the next level, take our intermediate tour:

Intermediate tour contents

• Extension functions

• Scope functions

• Lambda expressions with receiver

• Classes and interfaces

• Objects

• Open and special classes

• Properties

• Null safety

• Libraries and APIs

28 April 2025