From: "Rob Dixon" <[EMAIL PROTECTED]>
> "Jenda Krynicky" <[EMAIL PROTECTED]> wrote in message
> 3E01E02F.17624.1ED52A1C@localhost">news:3E01E02F.17624.1ED52A1C@localhost...
> > From: "Perl" <[EMAIL PROTECTED]>
> > > This should work (but beware - it is untested :)
> > >
> > > Rob
> > >
> > > my @required = qw(head1 head6 head8);
> > > my $line;
> > >
> > > for (<DATA>)
> >
> > It's much better to use
> > while (<DATA>)
> >
> > This "for (<DATA>)" forces Perl to read the whole file into an array
> > in memory. (Well ... unless the optimizer is bright enough to change
> > the command to "while (<DATA>)". Not sure it is. You should not
> > depend on the optimizer.)
>
> I agree completely. Also the optimiser shouldn't translate this to a
> while() as optimisers aren't supposed to change code semantics at all.
I wonder what is the difference between a
for (<DATA>) { ... }
and
while (<DATA>) { ... }
from the code-inside-the-loop's point of view.
The only thing that comes to mind is the $. variable (current line
number in the file being read).
> > P.S.: Rob, could you change the comment part of your mail address?
> > It's kinda strange to see a post comming from "Perl". :-)
>
> Yes, my apologies for this. I used to receive and send the newsgroup
> posts as emails and just today set up the perl.org NNTP server -
> wrongly! Things should be correct now.
Yep, thanks :-)
Jenda
===== [EMAIL PROTECTED] === http://Jenda.Krynicky.cz =====
When it comes to wine, women and song, wizards are allowed
to get drunk and croon as much as they like.
-- Terry Pratchett in Sourcery
--
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
