Doesn't "for" always automatically localize "$_" like in this example?
my @list = qw(I Like tacos);
for (@list) {
print "A:".$_."\n";
for ("Hello") {
print "B:".$_."\n";
}
print "C:".$_."\n";
}
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[d/l] |
It is good that you considered that type of problem, but in this case, it is harmless.
My rule of thumb is that when using a for/foreach loop, you do not need to localize $_, but if you are using a while(<>) loop, you must localize it.
This is because the for/foreach loop is already doing the local step for you, but it is the only time that this happens. | [reply] |
You are indeed correct. I've just gotten into the habit of localizing globals when I'm about to alter them, and I want to be sure I didn't sabotage someone else up the line.
I tend to assume that someone else reading the code might not think about $_ being global, alter the code so that $_ would get clobbered, and then be confused. If I've localized $_, and also commented why I've done it, it makes it easier to maintain. And I'm all about maintaining.
I suppose the Right Thing would be to not localize and comment that the for loop does it for me. :)
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