Scala is a pretty great language on its own.<p>Have a look at the adoption of Scala.js.
The ecosystem of Scala.js is larger than the &quot;compile-to-js&quot; ecosystems of &quot;rust, Haskell, go, c++&quot; combined.<p>One of main strengths of Scala is that people get things done. It&#x27;s the only language of the ones you mentioned which has reasonable support across three vastly different platforms.