[jmaker]

My experience is diagonally opposite. I haven’t written Scala for a while now, I guess a year or two by now, and just a few days ago got back to it because the logic I wanted to express was hard to fit in to Java, Kotlin, C#, Go. I have certain performance and correctness requirements and most stuff is JVM based. So I thought like okay, I can isolate it in a service and invoke from another JVM, but let me just try to express my type families and the algos the easy way around, and whoosh I see Scala compile and give me the correct results on my first attempt.

That was a bit of a surprise - I’d forgotten how expressive Scala is. I didn’t need any “advanced” type system features. But my time to market was literally a couple hours instead of days like with C#, Java, Kotlin, Go, bending to fit the logic into the confines of their type systems. Kotlin is just awesome and very expressive. But it turns out, to me, Scala is somehow very natural - just write what you think, and it works.

Interestingly, that was also my experience many years ago when I first exposed myself to Scala in a numerical analysis class just to avoid Java, and it just worked right away. I recall well that surprised feeling. So I’m kinda happy to move back to Scala now. But I’ll also try to implement the same in F#, right after delivering the next feature set.