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Hi,

I have an active record collection and I need to 'eval' a string against
each row from the collection. Instead of processing the 'eval' for each
row, I was thinking to 'cache' the eval into a Proc to for reuse, ie:

irb(main):001:0> @a = 1
=> 1
irb(main):002:0> @b = 7
=> 7
irb(main):003:0> c = %q{ @a + @b }
=> " @a + @b "
irb(main):004:0> d = Proc.new { eval c }
=> #<Proc:0x02ad1240@(irb):4>
irb(main):005:0> d.call
=> 8
irb(main):006:0> @a = 2
=> 2
irb(main):007:0> d.call
=> 9
irb(main):008:0>

Is my assumption that eval is relatively expensive, and that a Proc call
is fast correct?
Any suggestions on how to do this better?

Thanks 

Nev

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