From: The Higgs bozo <higgs.bozo@...>
Date: 2008-10-28T04:12:53+09:00
Subject: Re: Quick Scope Question

David A. Black wrote:
> On Tue, 28 Oct 2008, Daniel Malcolm Webb [dbw] wrote: 
>> Q_txt = res_q[0][1]
>>  (0..10).each do |qt|
>>    question_text = q_txt.scan(/\w+/)[qt]
>>  end
>>
>> when I access question_text after, obviously it's out of scope what am I
>> missing here?
> 
> Blocks have a kind of one-way valve local scope. Variables that
> already exist before the block will exist in the block. Variables that
> are created in the block do not survive past the block.

This is one reason I prefer {...} instead of do...end for blocks, since 
for me the curly braces shout "new scope".  while...end, for...end, 
until...end, if...end, unless...end do not introduce new scopes, yet 
do...end does.

Though class...end, module...end, def...end also give new scopes, there 
is little room for confusion because those are not control structures.
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