I really dig the succinctness of your folding solutions. On Nov 27, 5:52 pm, rob levy <r.p.l...@gmail.com> wrote: > fwiw my folding solution above yields the expected result. > > > > > > > > On Sat, Nov 27, 2010 at 7:07 PM, Benny Tsai <benny.t...@gmail.com> wrote: > > > Subvec, however, isn't lazy. > > > That's true. I just realized there's another problem with my approach > > as well: it does not preserve elements before the first true index. > > > user=> (partition-when true? [false true]) > > ([true]) > > > When the result should probably be: > > > user=> (partition-when true? [false true]) > > ((false) (true)) > > > On Nov 27, 2:05 pm, Ken Wesson <kwess...@gmail.com> wrote: > > > Subvec, however, isn't lazy. This is: > > > > (defn split-when [pred coll] > > > (let [ipred (complement pred) > > > bits (iterate > > > (fn [[out coll]] > > > (let [[a b] (split-with ipred (rest coll))] > > > [(cons (first coll) a) b])) > > > [nil coll])] > > > (map #(first (first %)) > > > (take-while #(seq (second (second %))) (map vector (rest bits) > > bits))))) > > > > user=> (take 10 (split-when #(= 0 (rem % 3)) (iterate inc 1))) > > > ((1 2) > > > (3 4 5) > > > (6 7 8) > > > (9 10 11) > > > (12 13 14) > > > (15 16 17) > > > (18 19 20) > > > (21 22 23) > > > (24 25 26) > > > (27 28 29)) > > > -- > > 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<clojure%2bunsubscr...@googlegroups.com > > > > > For more options, visit this group at > >http://groups.google.com/group/clojure?hl=en
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