Well, if it's golf... (use 'clojure.contrib.seq-utils)
(map first (partition-by identity [1 2 3 4 5 5 5 6])) On Feb 18, 9:34 am, Stuart Halloway <stuart.hallo...@gmail.com> wrote: > Rowdy's question asks for less than what core/distinct delivers--he > only wanted to remove *adjacent* duplicates. > > That said, core/distinct is a better demo of "how do I maintain state > across a lazy sequence without requiring any mutation?" > > Stu > > > Hi, > > > On Feb 18, 3:04 pm, Rowdy Rednose <rowdy.redn...@gmx.net> wrote: > > >> "Returns a lazy sequence of the items in coll for which (pred item) > >> returns true. pred must be free of side-effects." > > >> So that means I should not write a function like this: > > >> (defn unique [sc] > >> "Returns a lazy sequence with all consecutive duplicates removed" > >> (let [last (atom (Object.))] > >> (filter #(let [ok (not= @last %)] (reset! last %) ok) sc))) > > >> user=> (unique [1 2 3 3 4 5 5 6]) > >> (1 2 3 4 5 6) > > >> But in contrast to functions that can be retried (compare-and-swap > >> etc.), I don't immediately see why having side effects in filter > >> would > >> be bad. Can anybody enlighten me? And how should I do this instead? > > > Besides the other suggestions: clojure.core/distinct and its > > implementation. > > > Sincerely > > Meikel > > > -- > > 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 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
