From: Tim Wolak <tim.wolak@...>
Date: 2008-05-14T00:24:21+09:00
Subject: Re: hash merge

Thanks for the post guys. My problem is this:

a = { 54540 => 10345, 55550 => 30555 }
b = { 54540 => 11000, 55550 => 40556 }

I need to merge these into one hash where the keys are the same so that 
is fine, I need to subtract the values and the difference will be the 
new key.

So I'm not sure this line is doing that I think it should do, I'm pretty 
sure I may have the wrong syntax.

@sktyfuta.merge(@sktyfutb) { |key, old_value, new_value| old_value - 
new_value }

Tim
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