From: Robert Klemme <bob.news@...>
Date: 2003-06-24T17:04:10+09:00
Subject: Re: Block Scope Statement in the Pickaxe


"Joel VanderWerf" <vjoel@PATH.Berkeley.EDU> schrieb im Newsbeitrag
news:3EF7E177.4060808@path.berkeley.edu...
> I think this is just the distinction between #instance_eval and calling
> a block directly. With instance_eval, the binding of self in the block
> is changed to the receiver of instance_eval. Hope this example says it
> better:

Thanks!  That cleared the fog from my eyes. I thought the *eval family of
methods would only work on strings.

I came up with this condensed example:

class Foo
  def foo; yield; end
  def bar(&b); instance_eval(&b); end
end

f = Foo.new

f.foo {p self}  # -> main (in IRC)
f.bar {p self}  # -> <Foo...

Cheers

    robert