Downvoting isn't deterministic, each one has its own sensibility and culture.
In this particular case, I did not downvote your reply but I was a bit upset for your response. If you already knew some fields of interest in the differences between arrays and hashes, you could tell them in your original question, without waiting for responses and marking them as "ok, this is what I expected".
Moreover, your original post sounds like "I don't know when I should use one or another", so you got lots of replies pointing you to the basic documentation (and they were kind not to tell you RTFM). On the contrary, your reply springs up an interest into spatial efficiency, which is not a "newbie" issue, but a deeper one - this, I think, contributed to upset some monks.
Anyway, XP is just a number :)
Flavio
Don't fool yourself.
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