Making Programs Faster

"Optimizations"

The world is full of dumbassed 'optimizations' and 'benchmarks'
We'll see several today
Here's one I found while researching the Schwartzian Transform
The goal here is to do a case-insensitive sort

        sort { lc $a cmp lc $b } @stuff;

Here's what was suggested:

        Date: Sat, 15 Mar 1997 00:55:47 GMT
        Subject: Re: Sorting help
        Message-Id: <3329eefd.140372364@news.oz.net>

        # The *drum roll* Schwartzian Transform!
        @sorted = map  {$_->[0]} 
                  sort {$a->[1] cmp $b->[1]} 
                  map {[$_, lc $_]} 
                  @stuff;

Boldface code is operations that were added