Today at the O’Reilly Open Source Awards 2019, we were honored to hear that Kotlin has won the prestigious Breakout Project of the Year award, this award recognizes a project that has started “breaking out in a big way” over the past year, which we are really happy about. We want to say a massive thank you to O’Reilly OSCON for this recognition, but more importantly, we want to take a minute to thank the incredible Kotlin community who have brought the project to where it is today. Since our first commit to the GitHub repository on the 7th of November, 2010, we have watched in awe as the open

With all the exciting recent events, we had to postpone the publication of the Future Features Survey results. Sorry about that. Better late than never, this blog post summarizes what we learned from the survey. To recap, the Future Features Survey ran in April and got about 850 replies. We would like to thank everyone who took part in the survey! Survey results The raw (anonymized) data for the survey are available here. The questions asked were: The most expected feature 1, The most expected feature 2, The most expected feature 3 Nominate one feature that you would like to be banned (

We are happy to announce the first Technology Preview of Kotlin/Native that compiles Kotlin directly to machine code. The Kotlin/Native compiler produces standalone executables that can run without any virtual machine. It is not a fully functional release yet, but you can already play with the technology and take a look at its source code here. The compiler is available under the Apache 2 OSS license. (more…)

Congratulations! Today Kotlin 1.1 has reached Beta, and this means that it's time to try it out, there's still time to give us your feedback (and we really need it!), the release is coming fairly soon. We've seen a lot of interest in Kotlin over the past year, and would like to thank all our users, contributors and supporters. Special thanks to early adopters of new features for their bravery and feedback to our EAP builds! (more…)

While Kotlin 1.0.X releases keep delivering incremental updates and tooling features, we are working on the new language features in Kotlin 1.1. Today we are presenting the first preview version of 1.1, it's far from Beta, but the brave and curious ones can play with new exciting things (and hopefully give us their invaluable feedback). Compatibility This is not a stable version of Kotlin, and no compatibility guarantees are given here: in the future previews of 1.1, syntax, APIs, command-line switches and anything else may be changed. If you need a stable version of Kotlin, please stay on

It's been a month since we released Kotlin 1.0, and while our user base roughly doubled during this time, we prepared the first bugfix update. Kotlin 1.0.1 starts a series of 1.0.X versions delivering safe bug fixes and performance improvements to the language (as well as other parts of the project), and new features to our tools and integrations. This time it's only relatively small IDE features, but bigger things are on the horizon for 1.0.2 and later. Changes in 1.0.1 Please find the full change log here. Some numbers and highlights: it's 47 fixes in the compiler, library and Gradle pl

This is it. 1.0 is here! It's been a long and exciting road but we've finally reached the first big 1.0, and we're celebrating the release by also presenting you with the new logo: See discussions on Reddit and Hacker News (more…)

Finally, Kotlin has graduated the Beta and we are happy to present the Release Candidate Build! NOTE: as we announced earlier, RC requires all code to be recompiled to make sure no code compiled with older versions is kept around (please recompile even if you were on the EAP version!). This blog post gives an overview of the changes made since Beta 4. Library changes are the biggest in this build. Also, some bugs have been fixed. Full list of changes is available here. See the discussions on Hacker News and Reddit. (more…)

We are glad to present another update of Kotlin 1.0 Beta. We are working towards finalizing the standard library and getting rid of old deprecated constructs in the language, as well as bug fixes, performance improvements and future-proof checks. Full list of changes is available here. See closed issues here. (more…)

The first update to our Beta is here! We are stabilizing, so it's mostly bug-fixing and changes to the standard library. Language changes We are now enforcing single-instantiation inheritance constraint on type parameters: the same T can not have both List<Int> and List<String> as its upper bounds. This has been always forbidden for classes, now the same check applies for type parameters. (more…)

We are extremely pleased to present Kotlin 1.0 Beta for JVM and Android! To recap: Kotlin is a modern programming language that JetBrains has been working on for quite some time now. This post gives an overview of where we are and what’s coming next. Changes in this version are listed here. The story behind Kotlin Kotlin was conceived in 2010. Ten years of Java development led us to feeling that our productivity at JetBrains could be improved significantly by using a modern JVM language alongside Java. Having evaluated other available options, we decided that a new language was needed ther

We are happy to present Kotlin Beta Candidate. An official 1.0 Beta will be out soon. By now, the binary format is finalized, no major language changes are planned, and only a few changes in the standard library are coming. In this post we describe the changes since M14, including imports from objects, new safer collection interfaces, inlining for Java constants, better support for Java statics, and more. (more…)