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Scala 3 slowed us down?

(kmaliszewski9.github.io)
261 points kmaliszewski | 1 comments | 07 Dec 25 15:08 UTC | HN request time: 0s | source
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derriz ◴[07 Dec 25 16:56 UTC] No.46183103[source]▶
I was involved in a Scala point version migration (2.x) migration a few years ago. I remember it being painful. Although I recall most of the pain was around having lots of dependencies and waiting for libraries to become available.

At the time Scala was on upswing because it had Spark as its killer app. It would have been a good time for the Scala maintainers to switch modes - from using Scala as a testbed for interesting programming-language theories and extensions to providing a usable platform as a general commercially usable programming language.

It missed the boat I feel. The window has passed (Spark moved to Python and Kotlin took over as the "modern" JVM language) and Scala is back to being an academic curiosity. But maybe the language curators never saw expanding mainstream usage as a goal.

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hylaride ◴[07 Dec 25 17:07 UTC] No.46183190[source]▶
Outside of Android work, has Kotlin really taken over? My understanding is that Java added a lot of functional programming and that took a lot of wind out of Scala's sails (though Scala's poor tooling certainly never helped anything).
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esafak ◴[07 Dec 25 17:25 UTC] No.46183338[source]▶
Java's new features are always going to be on paper. The ecosystem, with all its legacy code, is always going to be a decade behind. And if you are starting a new project, why would you pick Java over Kotlin?
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1. spicybbq ◴[08 Dec 25 15:41 UTC] No.46193538{3}[source]▶
> And if you are starting a new project, why would you pick Java over Kotlin?

I've written multiple production services in Kotlin Spring Boot. Now, we're building a new system and using Java 21 (25 soon).

Why? Kotlin the language is great, but there are corresponding tradeoffs in interop. Meanwhile, Java the language has improved to the point that it's good enough, and Java feels like it's headed in the right direction. In my opinion, AI models are better at Java than Kotlin. If you prefer a weaker claim, the models are trained on more Java code than Kotlin code.

Finally, from an enterprise perspective, it is a safer long-term investment for a Java shop to own an application written in Java rather than in Kotlin.