Adrian and David are suggesting how to work functionally, which is best when appropriate. Berlin, if you really need state modified over time, Clojure does this differently from most languages. Values never change, only references to values and only in controlled ways. Maybe what you want is a ref, see http://clojure.org/refs
Something like this: (def x (ref 0)) (dosync ... (alter x inc)) (println @x) -Mike On Thu, Jun 11, 2009 at 11:21 AM, Berlin Brown <berlin.br...@gmail.com>wrote: > > > > On Jun 11, 12:16 pm, Daniel Lyons <fus...@storytotell.org> wrote: > > On Jun 11, 2009, at 9:25 AM, BerlinBrown wrote: > > > > > > > > > I do this a lot but can't figure out to change the UPDATEABLE_VALUE, I > > > am using some pseudo code because I don't have a clojure solution yet. > > > > > SET UPDATEABLE_VALUE = 0 > > > (loop [line (.readLine reader)] > > > (if (or (empty? line) (> line-num max-num)) > > > SET UPDATEABLE_VALUE = UPDATEABLE_VALUE + (SOME_FUNC) > > > (recur (.readLine reader)))) > > > > In general it's going to be something like this: > > > > (loop [line (.readLine reader) UPDATEABLE_VALUE 0] > > (if (or (empty? line) (> line-num max-num)) > > (recur (.readLine reader) (+ UPDATEABLE_VALUE (SOME_FUNC))))) > > > > Whenever you would have modified a local variable before, in FP you > > establish a new binding instead. > > > > — > > Daniel Lyonshttp://www.storytotell.org-- Tell It! > > I can modify the value within the loop, but what is a good approach > for accessing the value outside of the loop. For example (pseudo code > with a mix of procedural logic). > > ;; Init updateable value outside of 'loop' > SET UPDATEABLE_VALUE = 0 > (loop [line (.readLine reader)] > (if (or (empty? line) (> line-num max-num)) > SET UPDATEABLE_VALUE = UPDATEABLE_VALUE + (SOME_FUNC) > (recur (.readLine reader)))) > ;; Now outside of the loop, use UPDATEABLE_VALUE with the mutated > value > (println UPDATEABLE_VALUE) > > > > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
