You're preaching to the converted. :) If you use -MO=Deparse, you'll see that the for(;;) gets compiled to a while with a continue block, the latter being where the massive performance difference weighs in. Considering that the for(@array) form eradicates fence post errors from the root, there's rarely any good reason to use for(;;) in Perl.

Update: I forgot. Depending on your version of B::Deparse you may need increase the exposition level with the -x switch in order to see what things really look like to Perl under the hood. 
$ perl -MO=Deparse,-x7 -e 'for($i=0;$i<=10;$i++){}'
$i = 0;
while ($i <= 10) {
    ();
}
continue {
    ++$i
}
-e syntax OK
$ perl -MB::Deparse -e' print "$B::Deparse::VERSION\n"'
0.6
$ perl -v

This is perl, v5.6.1 built for i386-linux

[...]

[download]

Makeshifts last the longest.

In reply to Re: Is for(@$array_ref) construct optimized? YES! by Aristotle
in thread Is for(@$array_ref) construct optimized? YES! by Weasel

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