Wow lot of active people in the early morning, all typing faster than me on my phone... :-) On May 2, 2012 6:36 AM, "László Török" <ltoro...@gmail.com> wrote:
> You can also use doseq afaik, altough every element must realized at least > once, you just have to make sure you don't hold onto the head of the > sequence as you proceed. > > It is not immediately apparent to me why that doesn't happen with your > loop-recur solution > On May 2, 2012 6:27 AM, "Sean Neilan" <s...@seanneilan.com> wrote: > >> I forgot to mention: >> (nth (file-seq (java.io.File. "/DirectoryWithMillionsOfFiles/")) 200000) >> works great because nth doesn't realize the sequence! >> >> For now, I'll look at nth's source code to see how it iterates. >> >> On Tue, May 1, 2012 at 11:24 PM, Sean Neilan <sneil...@gmail.com> wrote: >> >>> Hi, >>> >>> I'm sure this has been discussed to death but I can't figure it out. >>> >>> I've got a file-seq sequence from >>> (file-seq (java.io.File. "/DirectoryWithMillionsOfFiles/")) that will >>> cause an out of memory error if realized. >>> >>> I want to call a function such as println on every element in the >>> sequence. >>> >>> I understand that naming the sequence will cause it to be realized. >>> >>> The problems >>> >>> 1. I can't use map as in (map println (file-seq (java.io.File. >>> "/DirectoryWithMillionsOfFiles"))). Map realizes the sequence. >>> 2. I can't use for as in (for [x (files)] (println x)). For realizes >>> the sequence. >>> 3. I can't use dorun because even though dorun doesn't realize the >>> sequence, it can't execute a function on every element. >>> 4. I can't use loop recur because it also realizes the >>> sequence: (loop [a (files) b (first a)] (println b) (recur (rest a) >>> (first >>> a))) >>> 5. I can't use refs because even though they provide state, they >>> can't save the state of the sequence without realizing the sequence. >>> >>> My question >>> *Should I try the new stream library?* >>> * >>> * >>> Thank you for your time. >>> >>> -Sean >>> >>> >> -- >> 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
