From: Joel VanderWerf <vjoel@...>
Date: 2008-05-18T05:19:33+09:00
Subject: Re: Easy way to use "self" in Proc

Leon Bogaert wrote:
> I thought I understood the block/proc thing. Guess not...
> 
> I thought when I proc is converted to a block, the code gets evaluated.
> So (I thought) when Proc.call() is, euhm, called, the proc gets 
> converted to a block and is getting evaluated in that context.

The block keeps the original context ("lexical scoping"), including 
local vars, self, and constants:

class C
   class D; end
   def foo
     local = 1
     proc { [local, self, D] }
   end
end

class D; end
local = 2
p [local, self, D]

p C.new.foo.call

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407