On Jul 18, 2014, at 5:45 AM, Brian Craft <craft.br...@gmail.com> wrote:
> => (empty [:foo 5]) > [] > => (first (mapv identity {:foo 5})) > [:foo 5] > => (empty (first (mapv identity {:foo 5}))) > nil => (class (first (mapv identity {:foo 5}))) clojure.lang.MapEntry => (class (first (mapv (fn [[k v]] [k v]) {:foo 5}))) clojure.lang.PersistentVector => (empty (first (mapv (fn [[k v]] [k v]) {:foo 5}))) [] by mapping identity over the map you're returning a vector of MapEntries (which print/deconstruct like a two element array). Cheers, Bob > > What just happened there? Is this expected? In the second and third cases the > type of the vector is clojure.lang.MapEntry, which I expect is the root of > the behavior, but this seems very inconsistent. Is there a way to get the > behavior one would expect? Should clojure.core/empty be avoided? > > -- > 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 > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- 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 --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.