From: Jason Lillywhite <jason.lillywhite@...>
Date: 2008-11-05T15:53:51+09:00
Subject: replace values in hash

how would I iterate over a hash, such as

x = { 'a' => "hi", 'b' => nil, 'c' => "do"}

and replace nil values with 'foo' then return the hash again?
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