Hi, It means that some of the maps can be nil, but at least one of them has to be non-nil. "some" requires a predicate, but since nil is logical false, we can just use "identity". Here's the behavior:
user> (merge nil nil nil) nil user> (merge {:a 1} nil {:b 2}) {:b 2, :a 1} -Stuart Sierra On Jan 22, 7:16 pm, wubbie <sunj...@gmail.com> wrote: > Hi, > > Here is def of merge: > > (defn merge > > [& maps] > (when (some identity maps) > (reduce #(conj (or %1 {}) %2) maps))) > > How can I interpret when (some identity maps)? > > Thanks > -sun --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---