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

Kotlin Multiplatform Mobile (KMM) is an SDK that allows you to use the same business logic code in both iOS and Android applications. Today KMM goes Alpha, and you can start sharing business logic in your mobile apps with it right away. It includes the new KMM Plugin for Android Studio, which allows you to write, run, test, and debug shared code in the same IDE. Join such great teams as VMWare, Autodesk, and Yandex who are sharing code in their mobile apps using Kotlin. Reusing code between mobile platforms has never been so easy! What is Kotlin Multiplatform Mobile? Kotlin Multiplatform Mobi

Today we’re releasing Kotlin 1.4.0! Over the past years, we’ve been working hard on making Kotlin a programming language that is fun, enjoyable, and productive to work with. To continue our pursuit of this goal with this version of Kotlin, we put a lot of energy and effort into improving the performance and quality of Kotlin and its tooling. We are also excited to announce support for several new language features, including the long-awaited SAM conversions for Kotlin interfaces.

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 spea

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

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 ta

We are happy to announce the first preview version of the new major release: Kotlin 1.4-M1. A few months ago, we published an announcement of what to expect in Kotlin 1.4. As the release approaches, we're offering you a preview in which you can try some of the new things for yourself. In this post, we'll highlight the following new features and key improvements available in 1.4-M1: A new, more powerful type inference algorithm is enabled by default. Contracts are now available for final member functions. The Kotlin/JVM compiler now generates type annotations in the bytecode for Java 8+ targe

Today we're happy to present to you the latest version of Kotlin – 1.3.70. This incremental release doesn’t provide any major new features. However, we've tried our best to improve the existing functionality, fix issues, and even add experimental things for you to try. Here are the highlights of Kotlin 1.3.70: New functions and classes for Kotlin collections in the standard library. Various improvements in the IntelliJ Kotlin plugin: improved *.gradle.kts support, testing, debugging, completion, and so on. The Kotlin/JVM compiler now generates type annotations in the bytecode for Java 8 a

Ktor 1.3 was released recently, and we’re happy to share the details with you in this blog post. Ktor consists of two parts: the server engine and a flexible asynchronous HTTP client. The current release focuses mainly on the HTTP client. Here you can find the complete changelog for this release. The client is a multiplatform library that supports JVM, JS, Android, and iOS and is now often used in cross-platform mobile applications. Our main goal for the next releases is to make the server engine multiplatform, too. The other areas we’re going to work on are: Improving integration w

We’re happy to present the new release today, Kotlin 1.3.60. In addition to the quality improvements, this version focuses on: Optimizing the comparison of inline classes. Tooling improvements for debugging, J2K converter, and Gradle scripts written in Kotlin. Support for more Kotlin/Native platforms/targets. Improving the Kotlin/MPP IDE experience. For Kotlin/JS, adding support for source maps and improving the platform test runner integration. Preview for some already implemented features of Kotlin 1.4. You can find the complete list of changes in the change log. As always, we’re really