You can't have a hash key point at an array, but you can have a hash key point at an arrayref.

my @array = (1,2);
my %hash;
$hash{X} = \@array;
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or you could do it like this:

my %hash = (
    X => [ 1,2 ],
);
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Generally, though, you can look at the perldsc man page for help on this subject.