Hi! An other possible solution is using state monad from https://github.com/clojure/algo.monads
Greetings. Andrey 2014-03-05 0:48 GMT+01:00 Jean Niklas L'orange <jeann...@hypirion.com>: > Hello, > > > On Tuesday, March 4, 2014 10:47:12 PM UTC+1, 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. >> > > Just a heads up: laziness is dangerous when using I/O. In this case, > with-open will close the reader before all lines have been read, and throw > an IOException for trying to read from a closed reader. > > Add a `doall` to the end of the threading, and it should be safe. Or use > `slurp` to read the whole file, avoiding the problem to begin with. > > As another suggestion: You can use a for comprehension, if you consider it > more readable. It's relatively similar to your imperative version. > > (with-open [rdr (clojure.java.io/reader "/dev/errors-sunday.csv")] > (doall > (for [line (line-seq rdr) > :when (re-matches #"^[^,]+,[^,]+,FAIL,.*$" line)] > (second (string/split line #","))))) > > -- Jean Niklas > > -- > 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. > -- Andrey Antukh - Андрей Антух - <andrei.anto...@kaleidos.net> / <n...@niwi.be > http://www.niwi.be <http://www.niwi.be/page/about/> https://github.com/niwibe -- 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.
