Argl... just forgot one of the "basic rules" ;)
On Sat, Nov 29, 2008 at 3:33 PM, Randall R Schulz <[EMAIL PROTECTED]> wrote: > > On Saturday 29 November 2008 06:27, Ralf Bensmann wrote: > > Thanks for clarification. But I am wondering about a function can > > return nil: > > > > user=> (fn [] ((+ 1 2) nil)) > > #<user$eval__63$fn__65 [EMAIL PROTECTED]> > > > > But "just returning nil" is not ok? > > user=> (fn [] (nil)) > > You're not returning nil, you're trying to apply nil (as if it were a > function) to an empty argument list. > > > > java.lang.NullPointerException (NO_SOURCE_FILE:24) > > user=> (fn [] ((nil))) > > java.lang.NullPointerException (NO_SOURCE_FILE:25) > > Now you're trying to apply the result of applying nil to an empty > argument list to an empty argument list. Naturally, it fails at the > same point, which is the inner attempt. > > > It's just simpler than you're trying to make it: > > user=> ((fn [] nil)) > nil > > > > > Thanks > > -Ralf > > > Randall Schulz > > > > --~--~---------~--~----~------------~-------~--~----~ 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 [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
