Death to
use constant! I've never seen the appeal of
use constant, and with modern Perls, it's completely unnecessary.
You can't easily interpolate 'constants' as they lack the sigil, and because of that, they also get auto-quoted on the left of a fat arrow, or if it's the only thing in a hash index. Furthermore, if you see:
my $variable = ALL_CAPS + 1;
does that mean that
$variable becomes one more than the constant ALL_CAPS, or does
$variable get the result of
ALL_CAPS(1)?
Luckely, there's Readonly.pm:
use Readonly;
Readonly my $PI => 4 * atan2(1, 1);
Readonly my $DEBUG => 0;
Much better, IMO.
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