Depends. Readonly is slow, and not everyone can use Readonly::XS. The following code takes 48 seconds:
use Readonly;
Readonly $C1 => 1;
my $t0 = time();
my $a = 2;
for (1 .. 10000000) {
if ($a ++ == $C1) {
;
}
}
print time() - $t0;
When this takes 4 second:
use constant C1 => 1;
my $t0 = time();
my $a = 2;
for (1 .. 10000000) {
if ($a ++ == C1) {
;
}
}
print time() - $t0;
If performance is important, use constant.
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