Kotlin
A concise multiplatform language developed by JetBrains
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                Fibers and Actors in Kotlin with Quasar
In the previous post we mentioned that the Quasar library now supports Kotlin, providing awesome support for fibers (lightweight threads), Go-like channels, Erlang-like actors, and other asynchronous tools.
Our friends from Parallel Universe have published a blog post that dives into details of using Quasar with Kotlin. Even in the unlikely case that multithreading doesn’t concern you much, Quasar/Kotlin integration is a great example of a “DSL” library written in Kotlin, it uses
- data classes
 - top-level functions
 - lambdas
 - annotated expressions
 when-expressions- inline functions
 
to build a natural-looking and efficient API, and the blog post explains it very well.
Enjoy!