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Re: Re: Find a file in a list of directories

by demerphq (Chancellor)
on May 06, 2002 at 16:50 UTC ( #164382=note: print w/replies, xml ) Need Help??


in reply to Re: Find a file in a list of directories
in thread Find a file in a list of directories

IMO in general grep and map shouldn't be chained together, map can do greps job without having retraverse the array.
return (map{-e "$_/$target" ? "$_/$target" : ()} @dir)[0];
And frankly why bother with map and grep at all? This is much more efficient.
sub FileFinder { my $target=shift; -e "$_/$target" && return "$_/$target" foreach @_; undef }
Oh and before the premature optimization police arrest me, remember that we are searching a filesystem (possible remote etc) here. That call to -e could take a while and if we have to do more of them than we really need to then we could end up wasting a lot of time.

Adjust the file test to your taste ;-)

Yves / DeMerphq
---
Writing a good benchmark isnt as easy as it might look.

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[Discipulus]: LA use Perl: traversing a dir tree is simple; foreach file mp3 $sec+= use Mp3::Info
[Lady_Aleena]: Discipulus, I was able to get the sum of the seconds on the command line using awk. Then I ran the result through a perl script and got the result. It came bach with 4 days, 9 hours, 56 minutes, 43 seconds.
[Lady_Aleena]: s/bach/back/;
[Discipulus]: gired anyway is the intermediate state between hired and fired (and vice versa;)
[Lady_Aleena]: Discipuluis, I don't know if I want to fight with File::Find. File::Find and I are not friends.
[Discipulus]: 4 day Bach is too muche even for me
[Discipulus]: LA you know who is paco?
[Lady_Aleena]: Disc, nope.
[Discipulus]: ahi ahi ahi!!

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