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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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