From: Suraj Kurapati <snk@...>
Date: 2008-10-02T05:29:23+09:00
Subject: Re: ruby1.9 block scope

Brian Candler wrote:
>   def my_find(a)
>     # res=nil not needed!
>     a.each { |e| res = e if e =~ /foo/ }
>     res
>   end

IMHO, the res=nil is necessary to preserve the semantics of a closure:

A lambda/closure should *enclose* the variables around it into a neat 
package.  It should *not* emit new variables into its surroundings! 
Otherwise, it would be something like an "opener" instead of a 
"closure".

> I still think the current rule ("tmp is part of the closure if it is 
> assigned to earlier in the method") is much more sane than the suggested 
> alternative ("tmp is part of the closure if it is assigned to earlier 
> *or later* in the method")

I agree wholeheartedly and I hope Ruby does not change in this regard.
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