Hello Rich & all! I am digging into behavior of function 'empty': user=> (doc empty) ------------------------- clojure.core/empty ([coll]) Returns an empty collection of the same category as coll, or nil
(empty [1 2]) => [] (empty (seq [1 2])) => nil (empty '(1 2)) => () (empty (seq '(1 2))) => () ; ok because of: (seq '(1 2)) => (1 2) (class (seq '(1 2))) => clojure.lang.PersistentList (class '(1 2)) => clojure.lang.PersistentList One trouble is with nil: (empty nil) => java.lang.NullPointerException (NO_SOURCE_FILE:0) Would it make sense to return nil? (empty nil) => nil Thank you, Frantisek --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
