1. Schwartzian Transform

   ---

   • We can get an easy speed improvement here:

     • Replace hashes { NAME => $_, DATE => -M $_ }

     • ...with arrays [ $_, -M $_ ]

   • Also, we usually eliminate the temporary variables:

         @sorted_names = 
           map { $_->[0] }
           sort { $b->[1] <=> $a->[1] } 
           map { [ $_, -M $_ ] } 
           readdir D;

• This is the Schwartzian Transform

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Copyright © 2002 M-J. Dominus