Given this plain array, one would obtain a hash by array slice easily.

use Data::Dumper;
my @array = ( 0, 1, 2, 3, 4, 5 );

my %uniq;
@uniq{@array[1..$#array]} = ();

print Dumper \%uniq;
[download]

Yielding:

$VAR1 = {
          '4' => undef,
          '1' => undef,
          '3' => undef,
          '2' => undef,
          '5' => undef
        };
[download]

But how can one achieve the same result, if what we have is AoA. I tried the following but doesn't work:

use Data::Dumper;
my %uniq;
my @aoa = ( ['foo',0],  # Changed from 'AoA' to 'aoa'. Thanks to bobf.
            ['foo',1],
            ['foo',2],
            ['foo',3],
            ['foo',4], 
            ['foo',5],);

@uniq{ @aoa[ 1 ... $#aoa ]->[-1] } = ();
print Dumper \%uniq;
[download]

Which prints the wrong:

$VAR1 = {
          '5' => undef
        };
[download]

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