Expressions are fun. In the .NET world we have an Expression library that behaves -almost- like S-Expressions. I'd say some things (i.e. currying) are simplifi

Expressions are fun. In the .NET world we have an Expression library that behaves -almost- like S-Expressions. I'd say some things (i.e. currying) are simplified but for the most part it's the same concept. You can look at every part of an expression and do whatever you want based on it. We often see it used either for advanced reflection, or, for Dynamic Method Generation. But, having written a few different parsers around it (and writing more LISP than I'd care to admit) I think anyone who is poo-pooing this has just never had the literal pleasure of writing a meaningful expression parser. EDI transforms and XSLTs don't count, folks. S-Expressions are dead simple