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(Ovid constants) Re: my $var; vs. use constant VAR = '';

by Ovid (Cardinal)
on Apr 27, 2001 at 01:08 UTC ( #75911=note: print w/replies, xml ) Need Help??

in reply to my $var = ''; vs. use constant VAR => '';

The second method is better defensive programming. However, what it does is pretty much equivalent to the following:
BEGIN { sub FILENAME() { '/path/to/file/to/munge' } }
Because FILENAME is actually a subroutine, it cannot be interpolated in quotes. In other words, the following are not synonymous:
my $filename = "/path/to/file/to/munge"; print "$filename"; use constant FILENAME => '/path/to/file/to/munge'; print "FILENAME";
The first example prints the filename, the second just prints "FILENAME".

That's a minor issue, but it does crop up from time to time (particularly when I'm writing an open X, Y or die statement).


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