From: Kristof Bastiaensen <kristof@...>
Date: 2004-04-23T23:04:09+09:00
Subject: Re: [NEWBIE] Extract all occurences from a text

On Fri, 23 Apr 2004 13:52:10 +0000, gabriele renzi wrote:

> il Fri, 23 Apr 2004 15:43:24 +0200, Kristof Bastiaensen
> <kristof@vleeuwen.org> ha scritto::
> 
>>On Fri, 23 Apr 2004 05:08:00 -0700, David Alan Black wrote:
>>
>>>> 
>>>> you could simply do:
>>>> 
>>>> lines=[]
>>
>>This line has no effect, the Array will be discarded
>>at the next expression
>>
>>>> open(filename) do |f|
>>>>  lines= f.grep your_regexp
>>>> end
>>> 
> 
> just try it ;P
> 
> If you do not initialize a variable outside of a block it will be
> discarded when the block ends. 
> 
> This will change in ruby2 and work like you expect (I expect the
> behaviour it has ATM)

Of course you are right.  Maybe initializing it to nil would
be less expensive and make the purpose more clear.