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There are lots of ways to get about a 50% speed increase over an ST. Creating all of those tiny anonymous arrays isn't a speedy task. It does lead to rather simple and non-error-prone code, however.

One alternative that is as general purpose is to build a separate array of keys to sort on and then sort a list of indices from that:

my @sorted= do { my @sorton= map { get_date($_) } @data; my @indices= sort { $sorton[$a] cmp $sorton[$b] } 0..@data; @data[@indices]; };
Another alternative that can be slightly faster but is a bit harder to customize is to combine the key to sort on with the original data into a single string in a reversible manner and use:
my @sorted= map { restore_orig_data($_) } sort map { prepend_sort_key($_) } @data;
See also http://www.sysarch.com/perl/sort_paper.html or even http://www.perl.com/doc/FMTEYEWTK/sort.html.

        - tye (but my friends call me "Tye")

In reply to (tye)Re: The Ovidian Transform by tye
in thread The Ovidian Transform by Ovid

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