> your apply will end up doing sometihng like this: > (#(println %1) "stu" "mary" "lawrence") > > since apply takes @visitors as a collection and passes each item as an > argument to the function you give it.
In other words, apply essentially unpacks the collection and passes the items as individual arguments to the specified function. str takes any number of arguments, so it works well with apply in your case. Your anonymous function is a one-argument function, but apply sends all items in your collection as arguments, and if your collection contains more than one element then that will be the wrong number of arguments. map is mapping the specified function to each element in the collection, one at a time, and returning a collection of the results. apply is calling the function once, but with all elements in the collection as the arguments and returning the result of that one function call. On Tue, Jul 17, 2012 at 2:35 PM, Jack Moffitt <j...@metajack.im> wrote: > > > So far, everything is working as I thought. But I also thought that apply > > let me run a function on everything in a sequence. Other than "str", I could > > not get this to work: > > > > user> (apply #(println %1) @visitors) > > I think you are looking for direct invocation: > > (#(println %1) @visitors) > > your apply will end up doing sometihng like this: > (#(println %1) "stu" "mary" "lawrence") > > since apply takes @visitors as a collection and passes each item as an > argument to the function you give it. > > jack. > > -- > 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 -- 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
