by the way, how can you put syntax color on Clojure code? in this email, very nice syntax colorized code is displaying.
thank you. On Monday, March 26, 2012 7:49:27 AM UTC+9, Dustin Getz wrote: > > first a quesiton about idiomatic code: > > ;; provided by book Fogus & Houser, Joy of Clojure > (defn index [coll] > (cond > (map? coll) (seq coll) > (set? coll) (map vector coll coll) > :else (map vector (iterate inc 0) coll))) > > ;; book gives this as idiomatic code > (defn pos [needle coll] > (for [[i val] (index coll) > :when (= needle val)] i)) > > ;; usage > (let [coll [:0 :1 :2 :3 :4 :5 :4]] > (pos :4 coll)) ;-> (4 6) > > ;; how can i make this alternate version better, and why provide :when, given > filter? > ;; is it possible to get the destructuring elegance above without `for` ? > ;; is this sequencing property of for (operate on individual values that will > end up in a seq) > ;; the reason `for` exists? is not not possible to do have nice syntax > wtihout for (or seq-monad)? > (defn pos2 [needle coll] > (let [pairs (filter (fn [[i val]] (= val needle)) > (index coll))] > (for [[i val] pairs] i))) ; can't destructure nicely without for, or > seq-monad, i think > > > meta question: where is the best place to ask noob questions like this, > and also more long-form discussion questions? stackoverflow frowns on > questions like this. i could slam in a couple of these a day, that doesn't > seem appropriate here. > -- 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
