I'm pretty sure the OP is experimenting to see when items are realized, and wants to know why it's "peeking ahead" one item. Most likely map is seeing if the next part is empty.
On Wed, Aug 28, 2013 at 5:39 AM, Christian Sperandio < christian.speran...@gmail.com> wrote: > In fact, you mix the output in the REPL and the result of the map > function. > The result of the map call is (1 2 3 4 5), but you have the print display > is managed by the repl and is done when is done :) > > If you want as result a string with the negative value, you must do: > > (map #(str "-" %) '(1 2 3 4 5)) > > > > 2013/8/28 <ljcppu...@gmail.com> > > Hi >> >> user=> (def r (map #(do (print "-") %) '(1 2 3 4 5))) >> #'user/r >> user=> (println r) >> (--1 -2 -3 -4 5) >> nil >> >> On Wednesday, August 28, 2013 4:57:49 PM UTC+8, Christian Sperandio wrote: >> >>> Hi, >>> >>> Try just one thing: >>> >>> (def r (map #(do (print "-") %) '(1 2 3 4 5))) >>> >>> And after, do (println r) >>> >>> What do you get? >>> >>> >>> >>> >>> >>> >>> >>> 2013/8/28 <ljcp...@gmail.com> >>> >>>> Hi >>>> >>>> (map #(do (print "-") %) '(1 2 3 4 5)) >>>> I think the result should be (-1 -2 -3 -4 -5), but it is (--1 -2 -3 -4 >>>> 5), it's difficult to understand, >>>> Can someone give answer? >>>> >>>> -- >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Clojure" group. >>>> To post to this group, send email to clo...@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+u...@**googlegroups.com >>>> >>>> For more options, visit this group at >>>> http://groups.google.com/**group/clojure?hl=en<http://groups.google.com/group/clojure?hl=en> >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "Clojure" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to clojure+u...@**googlegroups.com. >>>> >>>> For more options, visit >>>> https://groups.google.com/**groups/opt_out<https://groups.google.com/groups/opt_out> >>>> . >>>> >>> >>> -- >> -- >> 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 unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- > -- > 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 unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
