> is not The Driver for Scala to interact with Apache Spark ? A gateway drug? Perhaps. A driver? Perhaps. The only driver? Nope. For example Scala is used a lo

> is not The Driver for Scala to interact with Apache Spark ? A gateway drug? Perhaps. A driver? Perhaps. The only driver? Nope. For example Scala is used a lot for regular Web servers. > Secondly, it seems from comments here that Scala -> JS is a thing, so that is used for .. ? * For the frontend of Web applications, notably because it allows reuse of code across client and server; * For CLI applications based on Node.js (better startup time than with the JVM); * For server apps based on Node.js (for people who like the Node.js ecosystem better than the JVM's, or who have an existing codebase to integrate with); * For AWS Lambda apps (again, better startup time than the JVM); * For mobile apps through React Native; * For embedded applications, in cases where a JavaScript engine is available but no JVM; * For browser extensions; * For integration with any other kind of application that provides hooks in JavaScript (e.g., Google Sheets, see https://medium.com/@antoine.doeraene/make-your-google-spreadsheets-scala-ble-5695d9dd784f https://medium.com/@antoine.doeraene/make-your-google-spread...) * etc. > Third, is it the case that Scala 3 is taking the wind out of Scala 2 improvements, and the dev community is small enough such that, that is visible as 'not much happening' with Scala 2x ? No it is not the case. There are as many core contributors to Scala 2.x now than there were before the Scala 3 effort was launched. And there are many more external contributors, with numbers growing every year.