Your welcome! I just realized that, in this case, filter and map are good enough, but the general answer for threading state through the processing of a sequence is to use `reduce`. Coming from another language, it takes a while to realize how often the answer is to use reduce.
-Jason On Tue, Mar 4, 2014 at 4:07 PM, Dean Laskin <wdlas...@gmail.com> wrote: > Awesome, thanks Jason! It looks much cleaner. > > Dean > > > On Tuesday, March 4, 2014 4:47:12 PM UTC-5, Jason Felice wrote: > >> Something like >> >> (with-open [rdr (clojure.java.io/reader "/dev/errors-sunday.csv")] >> (->> (line-seq rdr) >> (filter #(re-matches #"...")) >> (map #(nth (string/split % #",") 1)))) >> >> Will do what you want. It's laziness to the rescue. >> >> >> On Tue, Mar 4, 2014 at 3:21 PM, Dean Laskin <wdla...@gmail.com> wrote: >> >>> I'm comparing two large files based on specific fields in the files. Is >>> there a functional way of accumulating the results without atoms? (And >>> since I'm a newbie, any other advice is appreciated!) >>> >>> (let [sun (atom []) fri (atom [])] >>> (with-open [rdr (clojure.java.io/reader "/dev/errors-sunday.csv")] >>> (doseq [line (line-seq rdr)] >>> (when (re-matches #"^[^,]+,[^,]+,FAIL,.*$" line) >>> (swap! sun conj (nth (string/split line #",") 1))))) >>> (with-open [rdr (clojure.java.io/reader "/dev/errors-friday.csv")] >>> (doseq [line (line-seq rdr)] >>> (when (re-matches #"^[^,]+,[^,]+,FAIL,.*$" line) >>> (swap! fri conj (nth (string/split line #",") 1))))) >>> (println (nth (data/diff (set @fri) (set @sun)) 1)) >>> ) >>> >>> Thanks, >>> Dean >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Clojure" group. >>> To post to this group, send email to clo...@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+u...@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 unsubscribe from this group and stop receiving emails from it, send >>> an email to clojure+u...@googlegroups.com. >>> >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >> >> -- > 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 unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
