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Often one wishes to construct "unnamed" data structures or subroutines where one keeps track of them by reference as opposed to name
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This is natural with subroutines which return either a data structure or subroutine
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$arrayref = [1, 2, ['a', 'b', 'c'] ]; # $arrayref is a hard reference to a 2D array with 5 defined elements
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$arrayref->[2][1] will give value 'b' as will $$arrayref[2][1]
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$arrayref->[0][0] is 1; $arrayref->[0][1] is undef;
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$secretsub = sub { print "Support ECS\n" };
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executed by &$secretsub;
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