> learn Kotlin (or Scala or Groovy or Clojure or whatever) on the side Scala's in a different league to Kotlin, Clojure, or Apache Groovy. None of those 3 lang

> learn Kotlin (or Scala or Groovy or Clojure or whatever) on the side Scala's in a different league to Kotlin, Clojure, or Apache Groovy. None of those 3 languages are in, say, the TIOBE Top 50 this month, whereas Scala's listed with almost 1% of the share, compared to Java's 12.7%.