From: "Hal E. Fulton" <hal9000@...>
Date: 2001-09-27T02:45:37+09:00
Subject: [ruby-talk:21743] Re: scope in {} and do-end

----- Original Message -----
From: ts <decoux@moulon.inra.fr>
To: ruby-talk ML <ruby-talk@ruby-lang.org>
Cc: <ruby-talk@ruby-lang.org>
Sent: Wednesday, September 26, 2001 12:31 PM
Subject: [ruby-talk:21742] Re: scope in {} and do-end


> >>>>> "H" == Hal E Fulton <hal9000@hypermetrics.com> writes:
>
> H> I thought that braces introduced a new scope
> H> but do-end didn't.
>
>  No, no
>
> H> Has this changed? Was it ever the case?
>
>  it was always the case
>
> H> Both these fragments tell me x is undefined.
>
>  normal
>
> Guy Decoux

I have been searching for where I first read about this.

It is in the 1.4 reference. Am I misunderstanding something?

Hal

================
The difference between do and braces are:

Braces has stronger precedence. For example:
 foobar a, b do .. end # foobar will be called with the block.
 foobar a, b { .. } # b will be called with the block.

Braces introduce the nested local scopes, that is newly declared local
variables in the braces are valid only in the blocks. For example:
 foobar {
   i = 20  # local variable `i' declared in the block.
   ...
 }
 print defined? i # `i' is not defined here.
 foobar a, b { .. } # it is not valid outside of the block