Also remember that `mapv` is not lazy and will force the map to run right away, which helps if side-effecty things like `println` are a part of the function.
On Thu, Feb 7, 2019 at 10:54 AM Justin Smith <noisesm...@gmail.com> wrote: > also do note that clojure.core/run! is designed for two-arg map when > it's only run for side effects, and clojure.core/doseq is designed for > nested side-effecting iteration > > On Thu, Feb 7, 2019 at 3:33 AM Pierpaolo Tofani > <pierpaolo.tof...@gmail.com> wrote: > > > > Thanks ! Your diagnosis is correct. With two dorun works fine. > > > > Il giorno giovedì 7 febbraio 2019 12:19:40 UTC+1, Orestis Markou ha > scritto: > >> > >> Without having ran your code, it seems that the inner map is not > wrapped in a doall, so while the outer lazy-seq is forced, the inner is not. > >> > >> This might be of interest to you: > http://clojure-doc.org/articles/language/laziness.html > >> > >> If you only want to do map for side effects, you could use dorun > instead of doall. > >> > >> On 7 Feb 2019, at 12:04 PM, Pierpaolo Tofani <pierpaol...@gmail.com> > wrote: > >> > >> Hi > >> i am new in clojure sorry. > >> In the snippet of code i used two map functions only to produce side > effects on two ref. > >> Even using doall no affect is produced on ref aaa and zzz, seems that > the sequence is still lazy. > >> But if i remove the final :done , and the repl show me the sequence > produced (that i don't care) the ref aaa and zzz are affected.Thanks in > advance. > >> PS The two map are in effect doing a for. > >> > >> (def aaa (ref 0)) > >> (def zzz (ref 0)) > >> (def s1 [1 2 3 4 5]) > >> (def s2 [1 2 3 4 5]) > >> (defn make-side [] > >> (do > >> (doall > >> (map > >> (fn [x] > >> (map > >> (fn [y] > >> (dosync > >> (alter aaa inc) > >> (alter zzz dec) > >> ) > >> ) > >> s2)) > >> s1) > >> ) > >> :done > >> ) > >> ) > >> > >> > >> -- > >> 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 > >> --- > >> 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/d/optout. > >> > >> > > -- > > 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/d/optout. > > -- > 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/d/optout. > -- 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/d/optout.
