On Tue, Dec 10, 2013 at 11:46 PM, Cedric Greevey <cgree...@gmail.com> wrote: > On Tue, Dec 10, 2013 at 6:29 PM, Vincent Chen <noodle...@gmail.com> wrote: >> >> Try this (not tested, might be missing parens and whatnot): >> >> (defn slice [x s n] >> (loop [[h & tail] x, s s, n n, acc []] >> (cond >> (zero? n) acc >> (zero? s) (recur tail s (dec n) (conj acc h)) >> :else (recur tail (dec s) n acc)))) >> >> Few notes: >> - When trying for tail recursions, use an accumulator. The accumulator >> carries the eventual result, which is returned at the base case. >> - Since we're destructuring into head and tail, I used vectors. conj >> will push to the end of the vector. >> - In Clojure, vectors tend to be more natural than lists. Accumulating >> into lists usually requires a reverse in the base case. > > > If you're going to go with vectors, why not go transient as well? > Ah. I've read about them, but have never used them before myself. Thanks.
By the way, my reply wasn't directed at you. I didn't know that you had already answered his questions until after I had sent mine :) -- -- 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/groups/opt_out.
