On Wednesday, May 2, 2012 7:24:04 AM UTC+3, Sean Neilan 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.
>
> Try doseq instead:
(doseq [x (files)]
(println x))
>
> 1. I can't use dorun because even though dorun doesn't realize the
> sequence, it can't execute a function on every element.
> 2. 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)))
> 3. 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
>
>
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