o You often want to speed up sort comparators

August 1999

Perl Hardware Store

Slide #33

You often want to speed up sort comparators
The slow part of this one is the calls to to_number:

         sub compare_dates {
           to_number($a) <=> to_number($b);
         }

We replaced 17,500 calls to split with 17,500 calls to to_number
Instead of using Memoize, we'll inline the memoization, like this:

Copyright © 1998 M-J. Dominus