The new AWS SDK for Kotlin was announced at AWS re:Invent in December 2021. Using the SDK, you can build Kotlin applications that work with Amazon S3, Amazon EC2, DynamoDB, and more. The SDK is currently in preview and is expected to become stable soon. The SDK was designed from the ground up to support the Kotlin language and its best practices, providing Kotlin developers with a familiar and idiomatic experience for interacting with AWS. The SDK leverages Kotlin coroutines for asynchronous implementation, and there are plans to make it compatible with Kotlin multiplatform projects.

In this post, I’m going to walk you through my solution to the Advent of Code 2021 Day 1 task. Of course, I used Kotlin to solve it!  https://www.youtube.com/embed/76IzmtOyiHw The input for the task is a text file, where each line is a number that represents a measurement of the depth of the seafloor. The task is to count the number of measurements where the depth increases. For example: 199 (N/A - no previous measurement) 200 (increased) 208 (increased) 210 (increased) 200 (decreased) 207 (increased) 240 (increased) 269 (increased) 260 (decreased) 263 (increased) In the sam

Grouping and counting the characters in strings and collections is a very typical task given in coding interviews. Usually, the solutions for such tasks are quite simple. In this blog post, we learn about a few useful functions in Kotlin that make set operations really simple. The task: custom customs The task for the Advent of Code Day 6 challenge requires us to count the answers on customs declaration forms. We are provided with the results of the filled-in forms for different groups of people. Below is the original sample provided in the AoC Day 6 challenge: abc a b c ab ac

Kotlin was designed to be very similar to Java to make migration as smooth as possible. However, Kotlin was also designed to improve the developers' experience by providing a more expressive syntax and a more sophisticated type system. To take full advantage of the language and write more concise code, learning Kotlin idioms is a must. Without them, it is easy to fall back into old Java patterns. So, where do you begin? In this blog post, we would like to highlight some good places to start on the path to learning idiomatic Kotlin. (more…)

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.

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.

GitLive uses Kotlin Multiplatform to share code between IDE plugins (for all JetBrains IDEs and VSCode), as well as soon-to-be-released mobile applications for iOS and Android. A team of 5 working on the project have written over 12k lines of Kotlin code as a shared library used by 4 different platforms: Android, iOS, JVM and Node.JS. This shared library represents 75-85% of the total code written for each platform (the other 15-25% being platform specific, mostly UI code). As a result: Time to market is reduced because there’s less code and fewer bugs, and because code maintenance is simplif

It is quite common to use existing frameworks and libraries for backend application development. If we look at most of the popular frameworks in the Java ecosystem, many of them actually support Kotlin out of the box. There are a lot of Java libraries too. You can use these frameworks and libraries in your Kotlin programs thanks to Kotlin’s flawless Java interoperability. Kotlin is an excellent choice for server-side application development. Go to the Kotlin for server-side page to learn more! This blog post is partially based on presentation content from the Kotlin 1.4 Online Event. You ca

Kotlin was created as an alternative to Java, meaning that its application area within the JVM ecosystem was meant to be the same as Java’s. Obviously, this includes server-side development. We would love to hear about your experience with Kotlin for developing server-side applications and share your experience with the community! Tell us your story! Kotlin has experienced immense growth in the Android ecosystem in recent years. The adoption of Kotlin for server-side development is growing steadily as well. However, the question we often get from companies considering adopting Kotlin for

We’re pleased to announce the release of version 1.4.0 of the Kotlin Coroutines library. The highlights of the release are StateFlow and SharedFlow, which are being promoted to stable API. StateFlow and SharedFlow are designed to be used in cases where state management is required in an asynchronous execution context with Kotlin Coroutines.

In TeamCity, when we need to build something, we create a build configuration. A build configuration consists of the build steps and is executed in one run on the build agent. You can define as many build steps as you like in one build configuration. However, if the number of steps grows too large, it makes sense to examine what the build configuration is doing – maybe it does too many things! We can split the steps into multiple build configurations and use TeamCity snapshot dependencies to link the configurations into a build chain. The way TeamCity works with build chains enables quite a f