Release

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

The newest release of IntelliJ IDEA, version 2021.1, comes with the improved Kotlin plugin. Enjoy an improved developer experience with faster code completion and highlighting, change signatures with better IDE support, benefit from better debugging experience for evaluating properties, and more. Here is what you’ll get by installing the new plugin: Faster code completion and highlighting Evaluation of custom getters right in the Variables view Change Signature refactoring with better IDE support Code completion for type arguments Class diagrams for your Kotlin code Othe

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

Kotlin 1.4.30 is now available. This is the last 1.4 incremental release, so we have lots of new experimental features that we plan to make stable in 1.5.0. We would really appreciate it if you would try them and share your feedback with us. We hope you enjoy testing out all these new updates, and please let us know what you think. What's changed in this release: Language features and compiler The new JVM backend went to Beta. Value classes, JVM records, and sealed interfaces update. Build tools Configuration cache support in Kotlin Gradle Plugin. Kotlin/Native Compilation time improveme

We’re planning to add new language features in Kotlin 1.5, and you can already try them out in Kotlin 1.4.30: Stabilization of inline value classes Experimental support for JVM records Experimental support for sealed interfaces and other improvements for sealed classes To try these new features, you need to specify the 1.5 language version. The new release cadence means that Kotlin 1.5 is going to be released in a few months, but new features are already available for preview in 1.4.30. Your early feedback is crucial to us, so please give these new features a try now! Stabilization

(Updated) The new backend is Stable and is itching to be made the new default. We need each of you to start adopting it, testing it, and giving us feedback so we can give it a final polish, let's look at how you can start using it. What is IR backend? After the compiler frontend is done analyzing the code, the backend generates the executables. We have three backends: Kotlin/JVM, Kotlin/JS, and Kotlin/Native. The first two were historically written independently and didn’t share much code. When we started Kotlin/Native, it was based on a new infrastructure built around an internal representat

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

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