The function basically returns 0 if the keys are equivalent, or -1 otherwise.
It satisfies a comparator, see http://docs.oracle.com/javase/7/docs/api/java/util/Comparator.html#compare(T,%20T) Thanks, Ambrose On Sat, Jul 26, 2014 at 7:52 AM, Geoff Little <fifos...@gmail.com> wrote: > Thanks so much Ambrose! I know that function is simple, but I don't > understand how it provides the functionality I'm after. Do you mind > explaining what's going on? I'm playing with it now in my repl. > > Thanks!! > > > On Friday, July 25, 2014 6:48:06 PM UTC-4, Ambrose Bonnaire-Sergeant wrote: > >> Hi Geoff, >> >> You probably want a sorted-map-by: >> >> user=> (sorted-map-by (fn [a b] (or (when (every? coll? [a b]) (when (= a >> (reverse b)) 0)) -1)) [1 2] 42 [2 1] 42) >> {[1 2] 42} >> >> Thanks, >> Ambrose >> >> >> On Fri, Jul 25, 2014 at 9:52 AM, Geoff Little <fifo...@gmail.com> wrote: >> >>> I'm attempting to proxy PersistentHashmap so that "get"ting an existing >>> key or its reverse returns the same value. >>> >>> Here's the code that I have >>> >>> (defn sym-key-hash-map [] >>> (proxy [clojure.lang.PersistentHashMap] [nil 0 nil false nil] >>> (valAt [key] >>> (or (proxy-super valAt key) >>> (proxy-super valAt (reverse key)))))) >>> >>> (let [key (list 1 2)] >>> (get (assoc (sym-key-hash-map) key "sweet") >>> (reverse key))) >>> >>> But unfortunately, the test code returns nil instead of "sweet". >>> >>> Does anyone with knowledge of proxy and PersistentHashmap know how to >>> solve this? >>> >>> Thanks. >>> >>> -- >>> 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.
