> perhaps keys also worked that way
No, it means you can write
#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };
use Syntax::Construct qw{ keys-array }; # More explicit than 5.012.
my @array = qw( abc def );
my @keys = keys @array; # 0, 1
my @values = values @array; # abc, def
while (my ($index, $value) = each @array) {
say "$index $value"; # 0 abc, 1 def
}
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]
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