in reply to The Drivel is in the Details
Why is the -> necessary in $source->{$node}
Because $source is a (hash) reference and it needs to be dereferenced.
and why the %$ and @$ symbols instead of just % and @?
Because the symbols are still simply % and @, but now you're using them to dereference something that is held in a scalar, which is prefixed by the $ sigil: this is another method for dereferencing, and in its full blown form it should be:
%{ $hashref }
But in this simple case the curlies can be omitted. In more complex contructs, they cannot.
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