Interesting and entertaining interview with Neal Ford of ThoughtWorks fame. He has lots of nice things to say about Groovy and Ruby.
The only point I disagree with is his assertion that in Groovy you can only do 80% of what you can do in Ruby in terms of DSL programming. I've never seen a Ruby DSL that couldn't be done in Groovy with a similar conciseness in the syntax. It would be nice if Neal could elaborate on this point.
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Actually, I show exactly that in my No Fluff, Just Stuff presentation this year on "Building DSLs in Static and Dynamically Typed Languages". Once you get to the far edge of what you can do with syntax, Groovy is still hampered by its interaction with Java. Unless I'm missing something, you can't do a true open class on an existing Java class (like Integer) without a category (i.e., you can't use an Expando for that). That means you have to have the Category closure block around something like this (which is one of the DSLs I show in my talk):
2.days.from.today.at(4.pm)
which needs an Integer open class. Also, Groovy limits you with property vs. method calling semantics. You can also do lots of meta-programming tricks in Ruby that simply aren't possible (yet) in Groovy (like creating stateful method attributes). There's going to be a lot of this stuff in the book I'm working on with co-authors on building DSLs in Ruby.
Believe me, I'm not casting stones at Groovy. I love it! It's the best way to code the JVM. But, it was never designed to be as flexible as Ruby.
Actually you can do that. It just isn't in Groovy core at the moment, but will be in 1.1. I implemented it for Grails and it is being migraded to Groovy for 1.1. It is called ExpandoMetaClass. Take a look here:
http://graemerocher.blogspot.com/2007/02/grails-041-out-groovy-just-got-more.html
Nevertheless, I await your book on Ruby DSLs, but I still maintain my stance: I have never seen a Ruby DSL that cannot be done in Groovy.
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