OK, thanks all, got it. Hugh
On Thu, Jan 15, 2009 at 1:33 PM, redc...@gmail.com <redc...@gmail.com> wrote: > > by having a parameter named "fn" you are shadowing the global "fn" > so what is happening is the "(fn ...)" form inside the function is > trying to apply the function you passed in to the arguments. the > function > you passed in takes no arguments so you get the " Wrong number of args > passed to" > exception. > > On Jan 15, 11:12 am, "Hugh Winkler" <hwink...@gmail.com> wrote: >> I just encountered a surprise attempting to return a function from a >> function. In the below case, if the function parameter is named "fn", >> then calling the function throws an exception. If the function >> parameter is named "f", no problem. (Using svn as of yesterday) >> >> (defn no-problem[f] >> (fn [] (apply f []))) >> (no-problem #(prn 99)) ;; returns a function as expected >> >> (defn problem[fn] >> (fn [] (apply fn []))) ;; same code as above but renamed >> function parameter to "fn" >> >> (problem #(prn 99)) ;; prints out "99" and throws an exception : >> >> java.lang.IllegalArgumentException: Wrong number of args passed to: >> dispatch$eval--3402$fn (NO_SOURCE_FILE:0) >> [Thrown class clojure.lang.Compiler$CompilerException] >> >> Restarts: >> 0: [ABORT] Return to SLIME's top level. >> 1: [CAUSE] Throw cause of this exception >> >> Backtrace: >> 0: clojure.lang.Compiler.eval(Compiler.java:4179) >> 1: clojure.core$eval__3733.invoke(core.clj:1582) >> --more-- >> >> Regards, >> >> 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 -~----------~----~----~----~------~----~------~--~---
