I wouldn't bother investing a lot of time into Groovy. It's a decent language, I used it in a port of about 10k LoC of Coffeescript Node.js code we had at the

I wouldn't bother investing a lot of time into Groovy. It's a decent language, I used it in a port of about 10k LoC of Coffeescript Node.js code we had at the end of last year, and it's fit our use case pretty well since it has good support for coffeescript idioms. But it's not very different. For me that was a selling point, but it's not super widely used nor will it teach you a lot (unless you've never worked with the JVM, in which case you will learn about the JVM with some nicer syntax than Java).