I just finished the first day and a half of OSCON - in the Scala Summit. And contrary to my anti-social nature, I even went to a Scala meetup last night.
As I've written before, I'm quite intrigued with the Scala programming language. It runs on the JVM and interfaces well with Java. It combines functional and object-oriented programming. It has actors for concurrency. And it has a rich type system that is probably Turing complete, like C++ templates.
Scala seems to be attracting a lot of attention. Of course, the Scala Summit attendees are all keen, but there were also several other language developers (like Charles Nutter of jRuby) interested in borrowing ideas from Scala.
Programming in Java is like driving a truck. It's not fast or fuel efficient or fun to drive or comfortable. But it gets the job done without a lot of problems and it can haul just about anything.
Why do people like to drive a fast car? It's not like they regularly need go from 0 to 60 in 5 seconds, or hit 200 km/hr. But they like to know that if they "need" to, they could.
Similarly, I think people like to know their language "has a lot of power under the hood", even if they never use it. And it gives lots of potential for books and conference talks that keep people excited.
And like you could use C++ simply as a better C, you can use Scala as a better Java. This lets less sophisticated users get involved as well.
The funny part is that it's very reminiscent of C++. There were all kinds of talks and articles and books about all the cool stuff you could do with templates and other fancy C++ features. Now, all you hear are negative comments about C++, too complicated, too hard to use, etc. I start to think I'm the only person that liked C++.
But there are differences too. Scala didn't try to be backwards compatible with Java the way C++ was backwards compatible with C. And Java already had object-oriented programming, so Scala isn't as big a jump as C++ (in that respect).
If nothing else, it's made me really want to spend some more time with Scala. It will sound crazy, but I'm very tempted to rewrite jSuneido in Scala. Thankfully, that's something that could be done gradually. I think it would let me make the code much smaller and cleaner. I think it would also make it easier to switch back and forth with Suneido coding, since Scala has things like named and default arguments, optional semicolons, and type inference that make the code much more similar to Suneido code.