On Jul 15, Randy W. Sims said:
[I see this a lot on these groups. I know most of the time it is just used for examples, but I thought I would point out that it is a bad habit.]
Anytime you make a direct assignment to the special variable $_, you should local-ize it. This code demonstrates the problem:
I have "better" code that demonstrates the problem:
Thanks. That's a much better and less contrived example.
Using the <FH> operator implicitly assigns to $_, without localizing it. Therefore, if you're going to use 'while (<FH>)', please local()ize $_ first.
That's got me wondering: are there any more operators or constructs that clobber $_ ? A few experiments show that C<for>, C<map> all localize $_. Am I missing any?
Not that I ever run into this anyway as I generally use an explicit variable:
foreach my $elem (@array)
or my version of the while (<FH>) in your example would probably be something like:
while (defined( my $line = <FH> ))
Randy.
-- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] <http://learn.perl.org/> <http://learn.perl.org/first-response>
