Yes, the programming languages course on Coursera! Yes, you're right, Scala is a lot more prevalent mostly because of Spark. I work on Spark occasionally but mostly use pySpark. But I'm fascinated by the world of functional programming. I think I tried setting up Elixir on my Mac a couple of years ago and it didn't work for some reasons and I almost forgot about it after that. I'm a bit interested in F# as a lot of finance companies use it. It's not that popular. I learned a bit from a Udemy course and I really liked the language even thought I'm not a fan of Microsoft. And it works perfectly on Macs! :)
