On Tue, Apr 6, 2010 at 07:16, Alex Osborne <a...@meshy.org> wrote: > Mark Engelberg <mark.engelb...@gmail.com> writes: > >> filter works just as well with a function that returns true and false, >> so that's not a particularly good example. > > Calling the set as if it is a fn is a short-hand for "get", that is > retrieving an element from the set. Why would you want to do this, when > to look it up you need to know what element is?
Since you asked: canonicalization. I've wanted this on occasion (in Java) when canonicalizing (i.e. interning) values. The obvious alternative is to use a map where each such value maps to itself. This is no real bother. So, I'm happy that Clojure sets behave as they do. Being able to use a set as a predicate directly is very handy. // ben -- 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
