The additional bonus of List::Util::first() is that it is compiled, so you will get performance akin to grep.

I wrote a myfirst using for that shortcircuits like List::Util: 

          Rate   myfirst   first
myfirst  875/s       --     -83%
first   5236/s      498%     --

[download]

More interesting, possibly, is a comparison of grep and first solutions - does the slight overhead of calling first (a compiled, but still user, function) out-weight the benefit? 

my ( $res ) = grep { $array[$_] =~ m/foo/ } 1..$#array;
# versus
my $res = first { $array[$_] =~ m/foo/ } 1..$#array;

__END__

       Rate  grep first
grep  227/s    --  -59%
first 556/s  144%    --

[download]

I used 1000 item lists created in each loop with a random item set to foo each time. Obviously the smaller the list, the smaller the return, but even down at a listsize of 10, there was a 7-12% gain...

Okay, it turned out not to be that interesting.

In reply to Re^2: finding index number in an array by fishbot_v2
in thread finding index number in an array by Anonymous Monk

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