Do you have example code that is failing?
You should be able to use some of the items you listed as "problems".
Try something like this:
(->> (file-seq (io/file "/some/dir"))
(map println)
(dorun))
AJ
On Wed, May 2, 2012 at 12:26 AM, Sean Neilan <s...@seanneilan.com> wrote:
> I forgot to mention:
> (nth (file-seq (java.io.File. "/DirectoryWithMillionsOfFiles/")) 200000)
> works great because nth doesn't realize the sequence!
>
> For now, I'll look at nth's source code to see how it iterates.
>
> On Tue, May 1, 2012 at 11:24 PM, Sean Neilan <sneil...@gmail.com> 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
>>
>> I can't use map as in (map println (file-seq (java.io.File.
>> "/DirectoryWithMillionsOfFiles"))). Map realizes the sequence.
>> I can't use for as in (for [x (files)] (println x)). For realizes the
>> sequence.
>> I can't use dorun because even though dorun doesn't realize the sequence,
>> it can't execute a function on every element.
>> 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)))
>> 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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