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c:\@Work\Perl\monks>perl -wMstrict -le
"use Data::Dump qw(dd);
...
["", "foo", "", "", "bar", ""]

indices of empty elements: 0 2 3 5

c:\@Work\Perl\monks>perl -wMstrict -le
"use Data::Dump qw(dd);
...
{ "0" => "", "1" => "foo", "2" => "", "3" => "", "4" => "bar", "5" => 
+"" }

keys of empty values: 3 0 2 5