How do I find matching expressions and return the match and the index of
the match?  Actually, I'd be happy with just the index.

Basically, I want the Ruby way to:
1) Given scalar s
2) Given array a1 = [] which monotonically increases (e.g.
[10,11,12,15,16,..])
3) Find the two elements in a1 who are nearest neighbors to the scalar
s.  I need the indices more than the values.

Clearly, I can find the nearest values with this:
>> [10,20,30,40,50].find_all{|item| item >= 25 }.first
=> 30
>> [10,20,30,40,50].find_all{|item| item <= 25 }.last
=> 20

How do I get the matched indices?  That is, without ugly loops.

R
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