Note also that in the REPL the last three values returned are kept
available under *1, *2 and *3.
M.
On 2 May 2012 15:40, Allen Johnson wrote:
> My example included a use of `map`. It is lazy and will work but you
> have to be sure that you aren't using it in a way that would hold onto
> the he
My example included a use of `map`. It is lazy and will work but you
have to be sure that you aren't using it in a way that would hold onto
the head of the sequence.
When experimenting in a repl it might not seem that it is lazy since
the repl will attempt to print the result of calling map when t
On Wed, May 2, 2012 at 12:01 PM, Sean Neilan wrote:
> I don't think so.
Of course it is. The problem is not in laziness, but in holding on to the head.
Regards,
BG
--
Baishampayan Ghose
b.ghose at gmail.com
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Map IS lazy but it still returns the entire realized sequence, as expected.
On May 2, 2012 8:31 AM, "Sean Neilan" wrote:
> I don't think so.
>
> On Wed, May 2, 2012 at 1:22 AM, Stuart Campbell wrote:
>
>> On 2 May 2012 14:44, Baishampayan Ghose wrote:
>>
>>> You can't use `map` because `map` wi
I don't think so.
On Wed, May 2, 2012 at 1:22 AM, Stuart Campbell wrote:
> On 2 May 2012 14:44, Baishampayan Ghose wrote:
>
>> You can't use `map` because `map` will return a sequence of the same
>> size and that can blow your heap.
>>
>
> Isn't `map` lazy too?
>
> Regards,
> Stuart
>
> --
> Yo
On 2 May 2012 14:44, Baishampayan Ghose wrote:
> You can't use `map` because `map` will return a sequence of the same
> size and that can blow your heap.
>
Isn't `map` lazy too?
Regards,
Stuart
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To po
Wow!! Lots of responses!
The problem was that I was running the code inside of a jark repl. The jark
repl apparently causes head holding of some sort.
All the examples you guys provided (@Allen, @Jonas, @Baishampayan) work in
a regular project from lein run.
They also work from the leiningen rep
> The problems
>
> I can't use map as in (map println (file-seq (java.io.File.
> "/DirectoryWithMillionsOfFiles"))). Map realizes the sequence.
You can't use `map` because `map` will return a sequence of the same
size and that can blow your heap.
> I can't use for as in (for [x (files)] (println
Wow lot of active people in the early morning, all typing faster than me on
my phone... :-)
On May 2, 2012 6:36 AM, "László Török" wrote:
> You can also use doseq afaik, altough every element must realized at least
> once, you just have to make sure you don't hold onto the head of the
> sequence
You can also use doseq afaik, altough every element must realized at least
once, you just have to make sure you don't hold onto the head of the
sequence as you proceed.
It is not immediately apparent to me why that doesn't happen with your
loop-recur solution
On May 2, 2012 6:27 AM, "Sean Neilan"
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 wrote:
> I forgot to mention:
> (nth
Sean,
> 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 t
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 realize
I forgot to mention:
(nth (file-seq (java.io.File. "/DirectoryWithMillionsOfFiles/")) 20)
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 wrote:
> Hi,
>
> I'm sure this has bee
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