Kotlin 1.4.20 is here with new experimental features for you to try. Being open to community feedback is one of the Kotlin team’s basic principles, and we need your thoughts about the prototypes of the new features. Give them a try and share your feedback on Slack (get an invite here) or YouTrack. Here are some of the key highlights: Support for new JVM features, like string concatenation via invokedynamic. Improved performance and exception handling for KMM projects. Extensions for JDK Path: Path("dir") / "file.txt". We are also shipping numerous fixes and improvements

It is quite common to use existing frameworks and libraries for backend application development. If we look at most of the popular frameworks in the Java ecosystem, many of them actually support Kotlin out of the box. There are a lot of Java libraries too. You can use these frameworks and libraries in your Kotlin programs thanks to Kotlin’s flawless Java interoperability. Kotlin is an excellent choice for server-side application development. Go to the Kotlin for server-side page to learn more! This blog post is partially based on presentation content from the Kotlin 1.4 Online Event. You ca

Andrey Breslav is stepping down as the Project Lead for Kotlin. Roman Elizarov is the new Project Lead.

Kotlin was created as an alternative to Java, meaning that its application area within the JVM ecosystem was meant to be the same as Java’s. Obviously, this includes server-side development. We would love to hear about your experience with Kotlin for developing server-side applications and share your experience with the community! Tell us your story! Kotlin has experienced immense growth in the Android ecosystem in recent years. The adoption of Kotlin for server-side development is growing steadily as well. However, the question we often get from companies considering adopting Kotlin for

Welcome to Kotlin Heroes 5: ICPC Round!

Today, we are excited to present the first milestone release of Jetpack Compose for Desktop, a modern UI framework for Kotlin that makes building performant and beautiful user interfaces easy and enjoyable. We invite you to take this technology preview out for a test drive, and we eagerly await your feedback! Visit the Compose for Desktop landing page Delightful desktop UI development Compose for Desktop provides a declarative and reactive approach to creating user interfaces with Kotlin, with an API inspired by other modern frameworks like React and Flutter. At its core, Compose for Desktop

The Kotlin 1.4 Online Event materials are available for you to watch any time. Recordings of the talks, and Q&As are available on the event web page, along with slides. You can watch the recordings in order using the Kotlin 1.4 Online Event playlist Kotlin 1.4 talks At the time of writing, the recordings from the Kotlin 1.4 playlist have been viewed more than 120 thousand times in total. The five most viewed talks are: New Language Features by Svetlana Isakova A Look Into the Future by Roman Elizarov State of Kotlin in Android by Florina Muntenescu Coroutines Update by Vsevolod Tolstopya

We’re pleased to announce the release of version 1.4.0 of the Kotlin Coroutines library. The highlights of the release are StateFlow and SharedFlow, which are being promoted to stable API. StateFlow and SharedFlow are designed to be used in cases where state management is required in an asynchronous execution context with Kotlin Coroutines.

TL;DR From now on, we will release Kotlin 1.X every six months. These releases will be date-driven, not feature-driven. The Kotlin IDE plugin will be released simultaneously with Kotlin, and on top of that — every time IntelliJ IDEA is released. Major IDE features will arrive in releases synchronized with IntelliJ IDEA. Why the new cadence? Since Kotlin 1.0 came out in 2016, we’ve built our release schedule around new key features in the language. This meant that until big language features were ready we would not release anything at all. As a consequence, we delivered changes and improveme

We are happy to share with you the release of version 1.0 of our multiplatform serialization library, kotlinx.serialization. As the first stable version of the library, we can finally consider it production-ready! Whether you are writing Android apps, using Kotlin Multiplatform Mobile, creating server-side services, or building web frontends with Kotlin/JS – kotlinx.serialization comes with a simple but powerful pure-Kotlin API, which makes it effortless to parse JSON into type-safe Kotlin objects, and vice versa. To celebrate this release, we want to provide a brief overview of some of the p

Today, we're excited to announce the public roadmap for Kotlin. This document describes the biggest projects our team is working on right now. It has a 6-month time frame and will be updated every 3 months. Each item on the roadmap represents a project with a linked YouTrack ticket. If you have a question about a specific project, feel free to post it in the corresponding issue. You are also welcome to join the #kotlin-roadmap channel in the Kotlin Slack (click here to request an invite), where you can ask questions about the current plans for Kotlin and share your feedback on the contents of

Compiling a lot of code fast is a hard problem, especially when the compiler has to perform complex analyses such as overload resolution and type inference with generics. In this post, I’ll tell you about a huge and largely invisible part of Kotlin which makes it compile much faster on relatively small changes that happen a lot in an everyday run-test-debug loop. Also, we are looking for Senior Developers to join the team at JetBrains working on fast compilation for Kotlin, so if you are interested, look at the bottom of this post. (more…)