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Going back to my attitude when I was a C programmer: It pays to know how your compiler thinks. (Needs adjustment for application to modern use of Perl, but the sentiment is the same.)

Adding/replacing these three lines into my original script above:

use Encode qw( encode_utf8 ); my $x = chr(1 << 63); my @Unsorted = ( 'Dog', 'Cat', 'Bird', undef, $x, 'Elephant', undef, ' +Lizard' );

Yields:

S:\Steve\Dev\PerlMonks\P-2017-06-12@0734-sort-undef>perl .\sort011.pl ---------------------------------------------------------------------- +--------- Original: ---------------------------------------------------------------------- +--------- Dog Cat Bird (undef) Wide character in print at .\sort011.pl line 58. Elephant (undef) Lizard ---------------------------------------------------------------------- +--------- ---------------------------------------------------------------------- +--------- Custom Sort: ---------------------------------------------------------------------- +--------- Bird Cat Dog Elephant Lizard (undef) (undef) Wide character in print at .\sort011.pl line 58. ---------------------------------------------------------------------- +--------- S:\Steve\Dev\PerlMonks\P-2017-06-12@0734-sort-undef>

A string of chr(255)bytes longer than the longest item in the original array still fails to sort to the bottom; knowing that Unicode characters are stored differently than old-fashioned ASCII strings empowers the Perl programmer to make a better choice.

Thank you for the information!

I'd upvote the post, but there isn't any point, as it's Anonymous Monk.


In reply to Re^6: Sort undef by marinersk
in thread Sort undef by Anonymous Monk

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