note
LanX
From what I can see from the source of [MOD://Algorithm::LUHN] nothing is exported by default:
<c>
@EXPORT = qw//;
@EXPORT_OK = qw/check_digit is_valid valid_chars/;
</c><P><P>
so if you wanna import <C>is_valid</C> you need to tell explicitly.<P><P>
see also [doc://Exporter#How-to-Export]<P><P>
<H5> EDIT<P></H5><P>
<I>> Is it somehow better to use the second statement if I use only "is_valid" method in my code? Maybe, memory issues or something?</I><P><P>
No! No significant memory problems, importing is a kind of aliasing between namespaces.<P><P>
But you have to care about potential <i>namespace polution</i>, see [doc://Exporter#Selecting-What-To-Export].<P><P>
Please note that you don't necessarily need to import <C>is_valid</C>, otherwise can also address <C>Algorithm::LUHN::is_valid</C> directly.
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<p>Cheers Rolf
</div></div>
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