Why does this Perl function return a value?

   $hi = do_this('asdf');

   sub do_this
   {
       $blob{'f'} = {
          'k' => 'j'
      };
   }

   print $hi->{'k'};
   # prints j

since do_开发者_如何学Gothis doesn't return anything, how does it still print j?

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http://perldoc.perl.org/functions/return.html

In the absence of an explicit return, a subroutine, eval, or do FILE automatically returns the value of the last expression evaluated

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All Perl 5 subroutines return the last value of the last statement executed.