Hi, Am 12.11.2012 um 22:01 schrieb JvJ:
> Metadata is a really useful feature, and it's been helping me a lot. It > seems like a flash of genius on the part of Mr. Hickey. I'm wondering if > similar concepts exist in other programming languages that inspired it, or if > it's unique to Clojure. Just a matter of curiosity, really. I think Perl has a specialised kind of metadata in form of “taintedness.” When you received an input from the user the variable becomes tainted. And certain operations will complain when fed from a tainted variable. A tainted variable is infectious. So the status is passed around with the value. You have to special validate the value and officially pronounce it clean. This was of use when working with CGI scripts to prevent code injection and such. Gros oversimplification from dark memories of distant past. Kind regards Meikel -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
