testfile.clj

;; http://pragprog.com/magazines/2012-03/comparing-java-and-scalas-expressiveness
;; first attempt for impl in clojure.. a lot to be improved! :)

(let [lines (map #(clojure.string/split % #" ")
                 (line-seq (clojure.java.io/reader (clojure.java.io/file "textfile.txt"))))
      grouped  (group-by #(second %) lines)
      parse-long (fn [log] (Long/parseLong (first log)))
      diff-times (fn [longs] (for [x (range (count longs)) :let [ts (nth longs x)] ] 
                              (if (= 0 x) ts
                                  (- ts (nth longs (- x 1))))))
      times (map (comp diff-times #(map parse-long %)) (vals grouped))]
  
  (print (zipmap (keys grouped) times)))

for sure, the Java version can be a lot better.
but C#'s LINQ is the best for now https://gist.github.com/2007893 :)

I've been using google collection/lambdaj/totallylazy/lazyrecords in the java situation to help too

…

On Fri, Mar 9, 2012 at 5:08 PM, Pedro Henriques dos Santos Teixeira ***@***.*** wrote: for sure, the Java version can be a lot better. but C#'s LINQ is the best _for now_ https://gist.github.com/2007893  :) --- Reply to this email directly or view it on GitHub: https://gist.github.com/2008267