I am surprised with the description of Kotlin.
It should be noted that it can be used for web development (increasing in popularity) and for embedded systems with kotlin native as well, not just mobile. It is a very young language that made it into the list in record time. It offers the JVM but with a much more pleasant experience for developers, and at the same time with extra security checks on your code thanks to nullability and mutability support. Increasing in popularity, a worth language to learn for your career
I actually work using Kotlin for webdev on large, non-trivial projects. It's good - and it's definitely not just for Android.
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