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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

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

Time flies, and today we want to present a few more powerful features of Kotlin 1.4 for your preview. Learn what Kotlin 1.4-M2 has in store, try it, and enjoy its features before they are officially released in Kotlin 1.4. We thank all of you who tried our first preview of Kotlin 1.4, shared your feedback, and helped make Kotlin better! Also many thanks to those who have already tried Kotlin 1.4-M2’s standard library improvements announced in our previous post. In this post, we'll highlight the new features and key improvements available in 1.4-M2: Support for sharing code in several t

We keep working on Kotlin 1.4 and the next preview 1.4-M2 is just around the corner. Right now we’re ready to unveil some improvements from this preview; in this post, we’ll get you acquainted with the standard library changes. Here are some key improvements in the standard library in 1.4-M2: Changes to the existing API like updating signatures and introducing new constants More functions in the common library New functions for Arrays and Collections Property delegation improvements Even though Kotlin 1.4-M2 hasn’t been released yet, we’ve deployed its early version to the Kotlin pl

We're happy to announce the second milestone release for Kotlin 1.2. The primary focus of this release is concerned with stability and bugfixes in Kotlin compiler and tooling as well as improvements of Kotlin standard library. It also includes many of the tooling features available in the upcoming release of Kotlin 1.1.4. We appreciate your feedback regarding the new features or any problems that you may run into with this release. The complete changelog since 1.2 M1 can be found here with some major changes listed below. (more…)

We're excited to announce the start of the early access program for Kotlin 1.2: today its first milestone release 1.2-M1 is out. This release enables by default new language features that were previously available in 1.1.x releases under experimental 1.2 language version setting. Also in the standard library you can preview the new API. The complete though not so big list of changes in this release can be found in the changelog. (more…)

We are glad to present you the fourth milestone of the upcoming Kotlin release. We're wrapping up the development of the version 1.1, with the final release planned for Q1 2017. Most features are already in decent shape, so it is a good time to try it and give us your feedback. We will appreciate it a lot! As with other milestone releases, we give no backwards compatibility guarantees for new language and library features. Anything introduced in milestone releases of 1.1 is subject to change before the final 1.1 release. Please do share your feedback regarding the new features or any problem

We are pleased to announce the third milestone of the upcoming Kotlin 1.1. This release brings new language features as well as improvements and fixes in the JavaScript backend, compiler and IDEA plugin. The new release also includes all tooling features introduced in Kotlin 1.0.5, and is compatible with IntelliJ IDEA 2016.3 EAP and Android Studio 2.2 and 2.3. As with other milestone releases, we give no backwards compatibility guarantees for new language and library features. Anything introduced in milestone releases of 1.1 is subject to change before the final 1.1 release. Please do share

The Kotlin Blog

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Kotlin 1.7.20-Beta Released

Kotlin 1.4-M3: Generating Default Methods in Interfaces

Kotlin 1.4-M2 Released

First Look at Kotlin 1.4-M2: Standard Library Improvements

Kotlin 1.2 M2 is out

Early access program for Kotlin 1.2 has been started

Kotlin 1.1-M04 is here!

Kotlin 1.1-M03 is here!