From: Jeremy Kemper <jeremy@...>
Date: 2008-08-13T06:09:06+09:00
Subject: Re: Ruby 1.9: What to Expect by Sam Ruby @ OSCON 2008 Slide Deck Adapted S6/S9 (Single-Web Page) Version

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