this doesn't work: user=> (defn if-a [a b] (if (a) (str a) (str b))) #'user/if-a user=> (if-a nil "b") java.lang.NullPointerException (NO_SOURCE_FILE:0) user=> (if-a "a" nil) user=> java.lang.ClassCastException: java.lang.String cannot be cast to clojure.lang.IFn (NO_SOURCE_FILE:0)
this does work: user=> (defn if-a [a b] (if (identity a) (str a) (str b))) #'user/if-a user=> (if-a nil "b") "b" user=> (if-a "a" nil) "a" why is the identity function is needed? thanks -- 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
