On 10 Apr 2006 17:55:24 -0700, Randal L. Schwartz <[email protected]> wrote:
> >>>>> ""Charles" == "Charles K Clarkson" <[EMAIL PROTECTED]> writes:
>
> "Charles> Dr.Ruud wrote:
> "Charles> : Bryan R Harris schreef:
> "Charles> :
> "Charles> :: for (1..9) { <>; }
> "Charles> :
> "Charles> : while (<>)
> "Charles> : {
> "Charles> : next if $. < 10;
> "Charles> : ...
> "Charles> : }
>
> "Charles> So a billion line file will require a billion tests
> "Charles> instead of 9. That doesn't seem like a good idea.
>
> If the cost of comparing $. to 10 is significant compared to the
> rest of your loop, you're in the wrong programming language.
>
> However, having said that:
>
> my $meat;
> $meat = sub {
> $meat = sub { real body of loop here } if $. >= 9;
> };
>
> $meat->() while <>;
>
> There. Happy? No more tests. And now you'll complain about the
> subroutine call. :)
Just to muddy the waters a little more (and hopefully answer a
question I've had for a while): how does the "flip-flop" operator
function here:
while (<>) {
next if 1..9;
# the rest of the code
}
Is '1..9' just shorthand for '$. <= 9'? Or does the flip-flop become a
no-op once it flips?
(I honestly has had no idea that was going to turn into bad perl
poetry when I wrote it. Sorry.)
Thanks,
--jay
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