Currently I’m staying at copenhagen at the GR8Conf (Grooy, Grails and Griffon confernence). In the talk of the day by Guillaume Laforge about DSLs he showed the following code:

[sourcecode language=”groovy”]
class CurrencyAmount {
Number amount
String currency
String toString() { "$amount $currency" }
}

Number.metaClass.getEuros {->
new CurrencyAmount(amount:delegate, currency:"EUR")}

10.euros
//Output: 10 EUR
[/sourcecode]

It is really interesting to see where in the java world the language evolvement happend. It’s a bit similiar (I’m careful here, because I do not know groovy very well) to the extension methods in .Net.

For me groovy and grails are very interesting technologies, so I will stay up to date.