Early Access Program

To make sure that all scenarios and project types are tested with the new Kotlin version, we’re starting the EAP Champions program – we invite you to join!

The Kotlin 1.7.20-Beta release is out! Here are some highlights from this preview version of Kotlin: The new Kotlin K2 compiler supports all-open, no-arg, Parcelize, and other compiler plugins.We introduced the preview of the ..< operator for creating open-ended ranges.The new Kotlin/Native memory manager is enabled by default.We introduced a new experimental feature for JVM: inline classes with generic underlying type. Learn more about these features and how to enable them in What’s new in Kotlin 1.7.20-Beta. For the complete list of changes, refer to release notes on GitHub. Ins

The first preview of the 1.7.0 release is out. Introducing Kotlin 1.7.0-Beta! This preview includes: - Changes to builder inference. - The return of the min() and max() collection functions. - Stabilizing of definitely non-nullable types. - Updates for the new Kotlin/Native Memory Manager.

The first preview of the 1.6.20 release is out! Introducing Kotlin 1.6.20-M1! This preview includes: Defining context-dependent declarations in Kotlin/JVM with the prototype of context receivers.Faster builds with parallel compilation of a single module in the JVM IR backend.Faster development with incremental compilation in Kotlin/JS IR.Easier code sharing with hierarchical structure of multiplatform projects.Kotlin/Native performance improvements. Install 1.6.20-M1 to try out these features and report any issues you find to help us improve Kotlin 1.6.20. Try new features Prototyp

The 1.5.30 release is approaching, and now we’re presenting the release candidate with the updated opt-in requirements, Kotlin/JS IR backend in Beta, support for Java toolchains in the Gradle plugin, improvements to the Regex and Duration API in the standard library, and more. Try it and report any issues you face to help us prepare the final release. We’ve unveiled the first set of Kotlin 1.5.30 features with the 1.5.30-M1 preview. In this post, we’ll briefly describe some more of the new features that you can try with Kotlin 1.5.30-RC: Updated opt-in requirement mechanism, more consist

Be the first to try the new features and improvements coming in Kotlin 1.5.30: native Apple silicon support, an improved Kotlin DSL for Cocoapods configuration, the ability to share custom native libraries across platforms in multiplatform applications, a better debugging experience for applications with the Kotlin/JS IR backend, and more. These features are available as part of an early access preview of 1.5.30. Install 1.5.30-M1 to get your hands on them. For the Kotlin Early Access Preview, we ship a few milestone builds before every release. You can install these builds and try feat

Kotlin 1.5.0-RC is available with all the features planned for 1.5.0 – check out the entire scope of the upcoming release! New language features, stdlib updates, an improved testing library, and many more changes are receiving a final polish. The only additional changes before the release will be fixes. Try the modern Kotlin APIs on your real-life projects with 1.5.0-RC and help us make the release version better! Report any issues you find to our issue tracker, YouTrack. Install 1.5.0-RC In this post, we’ll walk you through the changes to the Kotlin standard and test libraries in 1.5.0-RC: S

Kotlin 1.5.0-M2 is the last milestone release for Kotlin 1.5.0, which is coming this spring. So this is the last chance to make sure that your projects will successfully work with Kotlin 1.5.0. Install 1.5.0-M2 If you migrate your projects now, you can save yourself time and energy in the future, when Kotlin 1.5.0 comes out, and you can help us provide urgent fixes before the release. For example, if you try the new JVM IR backend, which is becoming the default in 1.5.0, and discover any issues now, we’ll try to deliver fixes before the release. You can report any issues you encounter to our i

We continue to highlight the upcoming changes in 1.4 release. In this blogpost, we want to describe a couple of important features related to coroutines: New functionality to conveniently debug coroutines The ability to define deep recursive functions These changes are already available for you to try in the 1.4.0-RC release! Let’s dive into details. Debugging coroutines Coroutines are great for asynchronous programming (but not only for that), and many people already use them or are starting to use them. When you write code with coroutines, however, trying to debug them can be a real pain.

We’re almost there! We're happy to unveil Kotlin 1.4.0-RC – the release candidate for the next major version of our programming language. Read on to learn about what has changed in Kotlin 1.4.0-RC, and make sure to try its new features before they are officially released with Kotlin 1.4.0. A special thanks to everyone who tried our milestone releases (1.4-M1, 1.4-M2, and 1.4-M3), shared their feedback, and helped us improve this version of Kotlin! This post highlights the new features and key improvements that are available in Kotlin 1.4.0-RC: Improved *.gradle.kts IDE support, with explicit

In Kotlin 1.4, we’re adding new experimental ways for generating default methods in interfaces in the bytecode for the Java 8 target. Later, we’re going to be deprecating the @JvmDefault annotation in favor of generating all the method bodies in interfaces directly when the code is compiled in a special mode. Read more details of how it currently works and what will change, below. In Kotlin, you can define methods with bodies in interfaces. It works if your code runs on Java 6 or 7, even before support for the default methods appeared on the JVM. interface Alien { fun speak() = "W

Today we’re glad to present the last milestone preview of Kotlin 1.4 – 1.4-M3. In this post, we’ll guide you through the changes this preview brings to the Kotlin standard library. Other components are also getting updates in M3; we’ll cover them soon in another blog post with the release candidate version (1.4-RC), which will finalize the scope of Kotlin 1.4. The standard library changes in 1.4-M3 include: JVM libraries now come with the module-info descriptor Functional interfaces are added to the standard library New collection operations to cover real-life cases @Throws annotation in the