From: "Iñaki Baz Castillo" <ibc@...>
Date: 2008-08-13T06:25:42+09:00
Subject: Re: Ruby 1.9: What to Expect by Sam Ruby @ OSCON 2008 Slide Deck Adapted S6/S9 (Single-Web Page) Version

El Martes, 12 de Agosto de 2008, Jeremy Kemper escribió:
> On Tue, Aug 12, 2008 at 1:36 PM, Iñaki Baz Castillo <ibc@aliax.net> wrote:
> > El Martes, 12 de Agosto de 2008, Gerald Bauer escribió:
> >> * Block Variables Now Shadow Local Variables
> >
> > What does it mean? For example, in Ruby 1.8 and 1.9 the following code
> > returns the same:
> >
> > ----------
> > kk=123;
> > puts "KK out of block = #{kk}";
> > 1.upto(3) { puts "KK in block = #{kk}"; kk=999 };
> > puts "KK out of block = #{kk}"
> > ----------
> >
> > KK out of block = 123
> > KK in block = 123
> > KK in block = 999
> > KK in block = 999
> > KK out of block = 999
>
> $ irb-1.8
>
> >> a = 1
>
> => 1
>
> >> [2].each { |a| }
>
> => [2]
>
> >> a
>
> => 2
>
> $ irb-1.9
>
> >> a = 1
>
> => 1
>
> >> [2].each { |a| }
>
> => [2]
>
> >> a
>
> => 1
>
> So the block arg 'a' no longer clobbers the local var 'a'.
>
> jeremy

No sure if I understand you. Please lok at this code:


~# irb1.8
irb(main):001:0> a=1
1
irb(main):002:0> [2].each { a=3 }
[2]
irb(main):003:0> a
3


~$ irb1.9
irb(main):001:0> a=1
1
irb(main):002:0> [2].each { a=3 }
[2]
irb(main):003:0> a
3



the result is the same (but true, if I run your code in 1.8 and 1.9 result is 
different, but I don't understand which is the difference between your code 
and mine).



-- 
Iñaki Baz Castillo