From: Tom Gilbert <tom@...>
Date: 2002-07-24T20:35:44+09:00
Subject: Re: Eval question

* Justin Johnson (justinj@mobiusent.com) wrote:
> I've got a question about 'eval'.  In the following example (which doesn't
> work by the way) where does 'val' live?
> 
> class MyClass
>   def tryIt( str )
>     eval str
>     p val
>   end
> end
> 
> a = MyClass.new
> a.tryIt( "val = 10" )
> 
> I was initially thinking that 'val' would be treated as a local to 'tryIt'.
> Maybe 'eval' works a little differently to how I thought it might?

It's local to the scope of the string being eval'd. Try this:

class MyClass
  def tryIt( str )
    val = eval str
    p val
  end
end

a = MyClass.new
a.tryIt( "val = 10" )

Tom.
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