Original link: The State of Scala & Clojure Surveys: How is functional programming on JVM doing / JVM weekly.
(I will skip Clojure and focus on Scala)
Projects are typical 3-11 years old. That sounds very plausible as Scala was hot for new projects 10 years ago, but not so much today.
Most used libraries: Typelevel 42%, Akka 35%, ZIO 23%, Play 16%, Spark 8%. I think the high Akka percentage is a good indication of Scala's niche status. It is far from 35% in the general industry that use an actor framework.
Most use IntelliJ IDEA. No surprise since Eclipse support is way behind in both Eclipse and Scala version!
Most build with sbt. No surprise since sbt is Scala's own build system.
They use old Scala versions: 2.11 - 3%, 2.12 - 13%, 2.13 - 55%, 3.x - 29%. Which is probably due to older projects and Scala 3.x not being fully compatible with 2.x.
They have a hiring problem. 57% don't know where to get new developers and 41% says that Scala slow down onboarding. No surprise - Scala is a very difficult language to master.