A modern programming language that makes developers happier.

kotlinlang

I don’t say that this is never be implemented (union types is better solution than `dynamic`), but for now I think it’s too big feature that cannot be easily supported on jvm

scala 3.0 will have union types, so I think this is not really an argument :wink:

Also, Scala don’t have such level of compatibility with Java as Kotlin
A lot of Scala features just impossible to use from Java

Check for example Ceylon, also has union types and big problems with compatibility with Java, so, I suppose this is one of the reason why Kotlin won (because Ceylon is actually closest competitor)