I waited 4 years for this Scala feature...

Jakub Kozłowski experiments with the experimental tracked keyword in Scala case classes to see how it improves modularity.

Tracked vals are here! "`F[_]` around and find out" is my series of videos made "in the moment", which are more exploratory than explanatory. We jump into a safe playground to experiment in hopes of reaching a goal, and sometimes we succeed (sometimes we don't). This is a callback to episode 1 of the series - the feature I was missing is finally here! (the `tracked` keyword in case classes, currently available as experimental). In fact, it's been here since Scala 3.5.0, I just didn't realize until now at 3.7.2. If you enjoyed this video, please like and subscribe, and hit the bell icon so you don't miss another one ;) Links: - Source code github.com/kubukoz/videos/tree/main/faround3 - Kacper Korban's talk from ScalaDays about this scaladays.org/editions/2025/talks/on-track-with-tracked - Docs: scala-lang.org/api/3.7.2/docs/experimental/modularity.html I'm on X: x.com/kubukoz on GitHub: github.com/kubukoz sometimes stream on Twitch: twitch.tv/kubukoz And you can buy me a coffee if you want: ko-fi.com/kubukoz Chapters: 00:00 - Introduction 01:19 - Project setup 01:55 - The tracked keyword 05:09 - A practical usecase 09:24 - Why this is cool 10:09 - Summary, parting words