Thanks! On Sun, Jul 29, 2012 at 9:22 AM, Moritz Ulrich <[email protected]>wrote:
> Also, take a look at `partition'. > > On Sun, Jul 29, 2012 at 3:19 PM, Mark Rathwell <[email protected]> > wrote: > > In your has22 definition, (by-pairs [a]) should be (by-pairs a) > > > > On Sun, Jul 29, 2012 at 9:07 AM, John Holland <[email protected]> > wrote: > >> I'm doing some exercises in coding that are meant for Java but I'm doing > >> them in Clojure. I'm stuck on this one. The goal is > >> to return true if an array of ints contains two consecutive 2s. I > figured > >> I'd use Stuart Halloway's by-pairs function to turn the sequence > >> into pairs of numbers and check for a pair that is 2,2. This code in > has22 > >> below works if pasted into the REPL and evaluated but as a > >> function it always returns false. If anyone can explain my error to me > it'd > >> be great. > >> > >> > >> > >> > >> > >> > >> > >> ( defn by-pairs [coll] (let [take-pair (fn [c] > >> (when (next c) (take 2 c)))] > >> (when-let [pair (seq (take-pair coll))] > >> > >> (lazy-seq > >> > >> (cons pair (by-pairs (rest coll))))))) > >> > >> (defn has22 [a] (if (some true? (map #(= 2 (first %) (nth % 1)) > (by-pairs > >> [a]))) true false)) > >> > >> > >> > >> user> (some true? (map #(= 2 (first %) (nth % 1)) (by-pairs [1 2 2 2 > ]))) > >> true > >> > >> > >> user> (has22 [1 2 2 2]) > >> false > >> > >> > >> John Holland > >> > >> -- > >> You received this message because you are subscribed to the Google > >> Groups "Clojure" group. > >> To post to this group, send email to [email protected] > >> Note that posts from new members are moderated - please be patient with > your > >> first post. > >> To unsubscribe from this group, send email to > >> [email protected] > >> 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 post to this group, send email to [email protected] > > Note that posts from new members are moderated - please be patient with > your first post. > > To unsubscribe from this group, send email to > > [email protected] > > 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 post to this group, send email to [email protected] > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- ______________________________________ Note new email address [email protected] -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to [email protected] Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/clojure?hl=en
