Right now (last []) => nil (last [nil]) => nil
So there is no way to differentiate these two (except with some emptiness checking). In my opinion (last []) should throw an exception, because that's when last does not apply. From another point of view, there are two cases: 1. The local semantics requires the collection not to be empty. Throwing an exception here will remove the burden of manual checking. 2. The local semantics allows the collection to be empty, in that case the caller needs to do (when-not (empty? c) (last c)). case 1 is the "normal case" with higher probability, so the burden of checking should be on the second case. Your opinion? Note this is rather academic because it probably is too late do anything about it at this stage. But it may help future cases. -- 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
