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