Refactor your Kotlin Career

Kotlin Programming course with Dave Leeds

Kotlin Illustrated - Now in Course Format

My new Kotlin Programming course is now available! It's based on the popular book, Kotlin: An Illustrated Guide, and includes exercises and solution videos. Over 10 hours of content!

Latest Videos

New!

When Flows Won't Cut It

Channels are mysterious for many Kotlin developers. While they power a lot of the higher-level coroutine APIs, there are also times when it makes sense to use them directly!

Say Goodbye to Callbacks

Got a callback-based library in your Kotlin code? Don't litter your main project code with them! Instead, just create a thin adapter layer that converts them to coroutines. I'll show you how.

We've Been Looking Forward to This One...

Kotlin 2.4 finally introduces Collection Literals, so that we can declare our collections with brackets instead of manually calling functions. And when we put them together with the new name-based destructuring feature, we end up with a particularly cool effect.

Latest Chapters and Articles

How to Prevent Race Conditions in Coroutines

Techniques for managing shared mutable state in Kotlin coroutines, without getting race conditions.

Coroutine Essentials

Discover the power of coroutines in Kotlin and learn how to make your applications perform tasks concurrently and in parallel. Join Rusty and his construction crew as they streamline construction projects – and see how you can apply these same techniques to your Kotlin code!

Generic Variance

Create subtypes from your parameterized types using Kotlin's generic variance. In this chapter, we'll learn about covariance, contravariance, and how they can be applied in declaration-site variance and use-site variance, based on three simple rules of subtypes.

Generics

Perk up your understanding of generics in Chapter 18 of Kotlin: An Illustrated Guide! Through the engaging examples of Jennifer's bakery café and its ever-evolving beverage menu, you'll learn all about generics, type parameters, type arguments, upper-bound constraints, and lots more.

Handling Runtime Exceptions

Catch the details about exception handling with Chapter 17 of 'Kotlin: An Illustrated Guide.' In this chapter, we'll look at how we can deal with problems that arise while our Kotlin code is running.

Sealed Types

In Kotlin, we can used sealed interfaces and sealed classes to make the compiler even more helpful! In this chapter, we'll learn how to get exhaustive matching with sealed types.