Rails - Jan 2009 - ruby array detect non linear data

Is there a way to detect in an array of say 1..500,  if some of the
numbers may be missing from the set.
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If you have an array of 1 to 500 called ''a'' and you wanted to
know if
any were missing you could do:

a.uniq.size and if that doesn''t equal 500 you are missing some.

If you need to know which ones are missing you could create a new
array of 1 to 500 and subtract the original

b = (1..500).to_a

b - a

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