Competitive programming is a fantastic way to sharpen your problem-solving skills in a programming language that you already know, or to explore new programming languages. The Kotlin Heroes contest is the perfect platform for that! Whether you’re a beginner or an experienced coder, Kotlin Heroes gives you the opportunity to challenge yourself, master or learn ..read more

To all students and recent graduates: The Kotlin Foundation is excited to announce the launch of the Kotlin Multiplatform Contest! Showcase your creativity and coding skills by building a cross-platform project using Kotlin Multiplatform and win a trip to KotlinConf 2025, the largest Kotlin event of the year.  Take part Kotlin Multiplatform allows you to ..read more

Kotlin DataFrame and Kandy are two powerful tools for data analysis in Kotlin. Kotlin DataFrame simplifies data manipulation and processing, while Kandy allows you to create visualizations directly within your Kotlin projects. In this post, we’ll show you how these tools can be used together within Kotlin Notebook to analyze the star history of GitHub ..read more

The Kotlin 2.0.20 release is out! This version includes performance improvements and bug fixes for Kotlin 2.0.0, where we announced the Kotlin K2 compiler as Stable. Here are some additional highlights from this release: For the complete list of changes, refer to What’s new in Kotlin 2.0.20 or the release notes on GitHub. How to ..read more

Welcome to this special edition of Kotlin Roundup, where we shine the spotlight on Ktor, our framework for building asynchronous servers and clients in connected systems!  This issue is packed with the latest updates, insightful news, and exciting developments in the Ktor ecosystem, appealing to everyone from seasoned Ktor enthusiasts to those just getting started ..read more

The latest release of Amper, version 0.4.0, is now available! In this release, we’re introducing a clear definition for the project root and providing a first look at settings tracing in Amper, alongside bug fixes and other improvements. To get support for Amper’s latest features, use Fleet 1.38 and IntelliJ IDEA 2024.2 (or later versions ..read more

The countdown to KotlinConf 2025 has officially begun, and we’re excited to announce that tickets are now on sale for this premier event, which will take place from May 21–23, 2025, in Copenhagen, Denmark! Organized by JetBrains, this is the largest Kotlin event in the world. Starting today, you can secure your spot at KotlinConf ..read more

Introduction The Kotlin DataFrame library makes extracting values from structured data an easy task. As discussed in our documentation, there are four separate APIs that can be used for this purpose, with the optimal choice depending on your individual situation and requirements.  To demonstrate, let’s read in a JSON document containing information about users: val rawUserData = DataFrame.read("https://dummyjson.com/users") .getFrameColumn("users") .first() rawUserData.select { cols(0..2) }.head(3) The final line selects the first three columns from the first three rows (for illu ..read more

You can now find all of the session recordings from KotlinConf’24 on the conference website! Sessions are also being added to the Kotlin YouTube channel: Photos and slides from some of the sessions are also available – click on a talk and select “Download slides” for the latter. Don’t miss these additional materials from the conference: A roundup of the highlights from the keynote in this blog post. KotlinConfersations, interviews with speakers and attendees hosted by Huyen Tue Dao. KotlinConf 2024 was held in Copenhagen, Denmark, from May 22–24, drawing over 2,000 attendees, speakers, and ..read more

This special edition of the Kotlin Roundup is dedicated exclusively to KotlinConf 2024, which took place last week. At the opening keynote, Egor Tolstoy, Michail Zarečenskij, Ekaterina Petrova, Sebastian Aigner, Vsevolod Tolstopyatov, and Svetlana Isakova announced a plethora of exciting updates, addressing JetBrains’ recent work on the Kotlin language. Meanwhile, our guest keynote speakers, Jeffrey van Gogh (Google), Julie Gunderson (Amazon Web Services), and Eve Matthaey (Meta), shared the latest news from their respective companies. Join us as we delve into the vibrant Kotlin ecosystem and ..read more