ExpressiveJava: Rewriting simple Scala interpreter – JDK17 code nearly identical

I wanted to share this little project I found. The author has been writing Java re-implementations of the same Scala interpreter over the years as newer JDK versions & features are released.

With JDK17 and the introduction of Record types, sealed classes/interfaces, and pattern-matching the implementation can come close to ver-batim mirroring the Scala 2 one:

https://github.com/Randgalt/expressive-java/blob/master/java...

  > NOTE: Pattern-matching for switch is in second preview for JDK17, so not all features used are stable

Unfortunately, the Scala org website is down right now, so the original/target code can be viewed here for the moment:

https://web.archive.org/web/20200103022853/https://www.scala...

The final feature that is needed to really seal the deal, is part of JEP 405 for destructuring + binding to values in patterns ("Deconstruction patterns"):

https://github.com/Randgalt/expressive-java/issues/3

https://openjdk.java.net/jeps/405