What does “1;” mean in Perl?

Question

I have come across a few Perl modules that for example look similar to the following code:

package MyPackage;

use strict;
use warnings;
use constant PERL510         


        

Answer 1

From the documentation for require:

The file must return true as the last statement to indicate successful execution of any initialization code, so it's customary to end such a file with 1; unless you're sure it'll return true otherwise. But it's better just to put the 1; , in case you add more statements.