Interestingly, the results are different for me. ; SLIME 2010-05-01 user> (def *forty-two* 42) #'user/*forty-two* user> (defn impure-add42 [n] (+ n *forty-two*)) #'user/impure-add42 user> (impure-add42 1) 43 user> (binding [*forty-two* 23] (impure-add42 1)) 24
On Jul 18, 7:14 am, Moritz Ulrich <ulrich.mor...@googlemail.com> wrote: > (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
