On Feb 11, 9:09 pm, Norbert Melzer <timmel...@googlemail.com> wrote:
> Hello everybody!
>
> I have a problem with an Hash of Arrays.
>
> ruby-1.9.2-p136 :001 > x = Hash.new Array.new
> => {}
> ruby-1.9.2-p136 :002 > x["test"] << "test"
> => ["test"]
> ruby-1.9.2-p136 :003 > x
> => {}
> ruby-1.9.2-p136 :004 > x.keys
> => []
> ruby-1.9.2-p136 :005 > x["test"]
> => ["test"]
> ruby-1.9.2-p136 :006 >
>
> Why is keys empty?
>
because you've never actually done x["test"]= ...
(all you're doing is modifying the hash's default value)
Fred
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