On Dec 13, 3:05 pm, Stephen Compall <stephen.comp...@gmail.com> wrote: > On Mon, 2011-12-12 at 10:53 -0800, Michael Jaaka wrote: > > (defn conr[ col item ] > > (lazy-seq > > (if (seq col) > > (cons (first col) (conr (rest col) item)) > > (list item)))) > > > And now stick with it. > > All works as desired: > > > (conr (conr (conr '( 1 2 3) 4) 6) 7) > > Though you should note that, despite the `lazy-seq' wrapper around the > body, as soon as you force the outermost seq, you're forcing all the way > down.
Perhaps I don't understand what you're saying, but I disagree. For example: user> (first (conr (take 10 (map #(do (println "realizing" %) %) (iterate inc 0))) 'x)) realizing 0 0 user> (last (conr (take 10 (map #(do (println "realizing" %) %) (iterate inc 0))) 'x)) realizing 0 realizing 1 realizing 2 realizing 3 realizing 4 realizing 5 realizing 6 realizing 7 realizing 8 realizing 9 x As you can see, only as many elements are realized as are needed to satisfy the user's request. -- 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
