From: "Mauricio Fernández" <batsman.geo@...>
Date: 2002-10-08T17:43:04+09:00
Subject: Re: Specifying local and external block parameters (that old chestnut)

On Mon, Oct 07, 2002 at 12:01:41AM +0900, ts wrote:
> >>>>> "M" == MikkelFJ  <mikkelfj-anti-spam@bigfoot.com> writes:
> 
> M> := assigns to local block scope,
> 
>  := assign to a variable which is always local to the block, even if a
>  variable with the same name exist in an outer block. For example
> 
>    b = 12
>    1.times { b := 2 }
> 
>  `b := 2' will create a new block variable which shadow the previous
>  variable  `b' 

matz said previously that in
	(0...10).each { |x| ... }
the values would be assigned to x with ':=', that is, 
	x = ...
inside the block would use the local. Put otherwise, this is the same as
the "make them all local" solution w.r.t. block parameters!

 
> M> = assigns to outside the local block scope.
> 
>   = has the same meaning than actually, if a previous variable exist ruby
>   use this variable otherwise it create a variable local to the block
>

Isn't this much stranger than what we have now?

i = 0
x = 'some value'
(0...10).each do |i|
 x := 'surprise!' if i == 2
 x = i # uses local after the := is run
end

x => 1

Having 'x = ...' meaning completely different things depending on the
"execution context" makes me feel unsecure.
>
> M> What happens with nested scopes.
> 
>  same
> 

-- 
Mauricio Julio Fernandez Pradier