Kotlin 1.5.0 – the First Big Release of 2021

This blog post continues from the previous one about how we measure IDE performance and what results we’ve already achieved. We want to give you a few tips on what to do if you are still experiencing poor performance and show you how best to approach us with issues that bother you. Features to useUseful tipsMaking us aware of IDE performance issues (more…)

The recordings of our 1.5.0 release celebration event are out and available for you on the Kotlin YouTube Channel. 🔔 Subscribe to the channel updates and stay up to date with the Kotlin future events! Recordings and slides  Our amazing hosts – Svetlana Isakova and Sebastian Aigner – gave a talk about the 1.5.0 updates, and Roman Elizarov presented on the future of Kotlin. Af

The performance of your tools, and especially your IDE, has a significant impact on your development experience. For a long time, performance was a pain point for Kotlin developers, especially those who worked with large codebases or with complex code structures. This is why for the past year we've been focusing on improving this experience for you. Our goal is to make sure working with our tools

More desktop UI goodies are coming your way! Milestone 4, the latest version of Compose for Desktop, comes packed with features to help you build even better Kotlin desktop applications with modern, declarative user interfaces based on Google’s modern toolkit. Visit the website In this post, we’ll walk you through some of the highlights of this release. They include: A new, experiment

Announcing a new series of webinars about Kotlin for server-side! These will take place between May 27 and June 17. Join the live sessions or watch the recordings later! In this five-webinar series, our speakers will host step-by-step live coding sessions to show you what kinds of benefits you can get from Kotlin for server-side and its rich ecosystem. Each webinar will include a Q&A sessio

We continue our series of Kotlin for server-side webinars. Between February 18 and March 18 we will host 4 webinars to explore applied software development with Kotlin on server-side through live-coding sessions. Speakers from JetBrains, VMware, Confluent, and Oracle will cover reactive programming, asynchronous applications with the Ktor framework, building microservices with Helidon, and other a

Like most startups, at the beginning of its journey Faire was looking for an efficient solution to base its tech stack on. Here is their story of starting with Java and migrating to Kotlin in a year.

Expedia adopted Kotlin because of its null-safety compiler guarantees, the conciseness of the language, and its full Java interoperability. Interoperability with Java made a gradual Kotlin integration possible without having to fully rewrite applications.

Since the release of Kotlin Multiplatform Mobile about 9 months ago, more and more developers have decided to give it a try and start to share their code between mobile platforms. Some do this in their free time while working on pet projects. Some integrate KMM into existing apps. And some even base their brand new applications on the KMM technology. The technology is already helping many dev

Kotlin Multiplatform Mobile (KMM), an SDK for cross-platform mobile development, went Alpha in August 2020. Over the past 9 months, the KMM ecosystem has been rapidly evolving: Each new Kotlin version comes with features and improvements that enhance the multiplatform development experience.KMM development tools, such as the KMM Plugin for Android Studio, are constantly receiving updates to mak

Nabil Hachicha, Android Engineer, from MongoDB Realm shares their story of creating a pure Kotlin-first SDK for use by developers. Realm is an open-source, easy-to-use local database that helps mobile developers to build better apps faster. It launched 8 years ago with the release of the Realm Java SDK, and since then we've worked to make sure our API is always improving to reflect what mobile de

Alec Strong from Cash App shares their story of adopting KMM and benefiting from shared code across their mobile platforms. Cash App is the easiest way to send money, spend money, save money, and buy cryptocurrency. We believe in providing everyone with access to important financial services so they can fully participate in the economy. The app launched in 2013 as a simple peer-to-peer payment app

KotlinDL 0.2 is available now on Maven Central with a variety of new features. New layers, a special Kotlin-idiomatic DSL for image preprocessing, a few types of Datasets, a great Model Zoo with support for the ResNet and MobileNet model families, and many more changes are now receiving a final polish.

This update of the Kotlin kernel for Jupyter Notebook primarily targets library authors and enables them to easily integrate Kotlin libraries with Jupyter notebooks. It also includes an upgrade of the Kotlin compiler to version 1.5.0, as well as bug fixes and performance improvements. pip installConda install The old way to add library integrations As you may know, it was already possible to inte

We have released Preview 2 of Kotlin for Apache Spark. First of all, we’d like to thank the community for providing us with all their feedback and even some pull requests! Now let’s take a look at what we have implemented since Preview 1? Scala 2.11 and Spark 2.4.1+ support The main change in this preview is the introduction of Spark 2.4 and Scala 2.11 support. This means that you can now run jobs

You can understand a lot about data from metrics, checks, and basic statistics. However, as humans, we grasp trends and patterns way quicker when we see them with our own eyes. If there was ever a moment you wished you could easily and quickly visualize your data, and you were not sure how to do it in Kotlin, this post is for you! Today I’d like to talk to you about Lets-Plot for Kotlin, an open-

Kotlin Coroutines 1.5.0 delivers GlobalScope that is now marked as a delicate API, extensions for JUnit, the refined Channel API, and stabilized reactive integrations.

Today we’re exploring kotlinx-datetime 0.2.0 — a new version of the Kotlin library for working with dates and times.

kotlinx.serialization 1.2 is out! The latest version of our multiplatform serialization library brings a number of improvements – here are the highlights: JSON serialization is faster than ever before. Version 1.2 is up to twice as fast as previous versions when parsing JSON into type-safe Kotlin objects and turning Kotlin objects into their text representations. Kotlin 1.5 type system additi

Introducing viktor viktor is an open-source Kotlin library developed by JetBrains Research that aims to make array calculations more efficient. We achieve this by avoiding nested arrays, delegating expensive operations to JNI + SIMD, and providing built-in support for arithmetics on logarithmically-stored numbers. This post is in celebration of the 1.1.0 release. We will discuss what the library d