From: Quintus <sutniuq@...>
Date: 2010-08-03T18:46:59+09:00
Subject: Re: Block variable & Local variable

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Am 03.08.2010 11:02, schrieb Eugen Ciur:
> Look here
> http://svn.ruby-lang.org/repos/ruby/tags/v1_9_1_0/NEWS
> 
> Since v 1.9.1 block arguments (in our case |num|)  are  always local,
> i.e in 'each' block |num| will not conflict
>  with outer 'num' variable. In your machine you have 1.9.1 version.
> 

Additionally, if you run ruby with warnings enabled, you get notified:

marvin@ikarus:~$ ruby -w
array = [1,2,3,4,5]
x = 1
num = 1
array.each{|num| puts num*20 + x}
- -:4: warning: shadowing outer local variable - num
puts num
21
41
61
81
101
1
marvin@ikarus:~$ ruby -v
ruby 1.9.1p429 (2010-07-02 revision 28523) [x86_64-linux]
marvin@ikarus:~$

Marvin
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