In fact, it depends on the module in question. But, if the module uses Exporter
, the second option only imports is_valid
into the current namespace. All other functions still exist under their fully qualified names, so the memory should not matter. But, if the module exports a subroutine called "all" or something similarly simple, you can avoid a clash with your own "all" subroutine. The qw
way keeps your namespace clean and under better control.
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