Maps aren't ordered so this isn't a good idea anyway. The reason first/second work is because they call seq on the collection.
(key (nth (seq {:a 1 :b 2 :c 3}) 1)) -> :b On Mon, Apr 20, 2009 at 2:51 PM, hughw <hwink...@gmail.com> wrote: > > Hi all, > > Why should 'first and 'second work on maps, but not 'nth? > > user> (key (first {:a 1 :b 2 :c 3})) > :a > user> (key (nth {:a 1 :b 2 :c 3} 0)) > ; Evaluation aborted. > > java.lang.UnsupportedOperationException: nth not supported on this > type: PersistentArrayMap (NO_SOURCE_FILE:0) > [Thrown class clojure.lang.Compiler$CompilerException] > > Thanks, > Hugh > > > > --~--~---------~--~----~------------~-------~--~----~ 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 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 -~----------~----~----~----~------~----~------~--~---