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 <[email protected]> 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
>
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