(def *forty-two* 42) (defn impure-add42 [n] (+ n *forty-two*))
(impure-add42 1) => 43 (binding [*forty-two* 23] (impure-add42 1)) => 65 On Sun, Jul 18, 2010 at 12:57 AM, Laurent PETIT <laurent.pe...@gmail.com> wrote: > Hi, > > 2010/7/17 Paul Richards <paul.richa...@gmail.com> >> >> The "Programming Clojure" book states: "Functions that use dynamic >> bindings are not pure functions.." (P2.0, page 174). >> >> I do not understand why this must be the case, can someone explain why? > > Because then the result of the function does not *only* depend on its input > arguments. > >> >> PS. I tried to post this on the discussion page for the book >> (http://forums.pragprog.com/forums/91), but I could not register and >> login correctly. >> >> -- >> Paul Richards >> @pauldoo >> >> -- >> 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 -- Moritz Ulrich Programmer, Student, Almost normal Guy http://www.google.com/profiles/ulrich.moritz -- 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
