The language is said to be very concise, safe in terms of error frequency, interoperable with Java and also offers many features that enable functional programming, writing type-safe DSLs and much more. Nevertheless, it's an open source language, which can be found on GitHub. Kotlin is being developed by JetBrains, who are responsible for the most famous IDEs out there, most notably IntelliJ IDEA. One special reason is that it experienced a lot of attention in the Android community after Google made Kotlin an official language for Android development. Kotlin has become one of the most popular JVM languages in the past few months. The problem in this portion of the tutorial was to take this Java code and rewrite as Kotlin code.Disclaimer: This reference has originally been published as a DZone Refcard. Of course, I wanted to do the exercise myself so that I can get the hang of writing Kotlin code. I thought this was incredibly slick because it gave me the change to see the differences between Java and Kotlin. You can see in the video that IntelliJ just did the work of taking the Java code that I copied and pasted into my Kotlin class. When you copy and paste Java code into the IDE, it will offer to translate it to Kotlin for you.

It was IntelliJ’s support of Kotlin that blew me away. It wasn’t that I was super impressed with the language itself. When I moved onto part two of the tutorial, I was really impressed. Nevertheless, I decided to continue with the Kotlin tutorial found at. After doing the first tutorial on Kotlin, I was impressed, but let’s face it, anyone can do a simple “hello world” style program.

Kotlin koans online