The somewhat awkwardly named Sort::Half::Maker is a pretty interesting little chunk of code. A one-off developed by the author to dump data with important keys first, it allows you to "sort by example" as in our code sample which yields:
Other uses for it might be to ensure that in a sorted list of contestants, those who placed sort accordingly, while everyone else sorts alphabetically; perhaps with no-shows or disqualified individuals bringing up the rear. This would require a multi-step sort where placed contestants are sorted by rank into a start, whose results are then referenced by the ½ maker.
1 use Sort::Half::Maker 'make_halfsort'; 2 3 #Hooray for tuples 4 my @order = (Dasher=>Dancer, 5 Prancer=>Vixen, 6 Comet=>Cupid, 7 Dunder=>Blixem); 8 9 #…and a Rudy to lead! 10 unshift @order, 'Rudolph'; 11 12 13 #Pseudo-random order 14 my @data = qw/Dunder Blixem Dasher Dancer Prancer Vixen 15 Rudolph Comet Cupid Olive Chet/; 16 17 $sub = make_halfsort(start => \@order); 18 print join(',', sort $sub @data), "\n";
Sort::ByExample - without end, but with fallback, transmogrification and dependencyitis