From: Daniel DeLorme <dan-ml@...42.com>
Date: 2008-09-30T09:14:24+09:00
Subject: Re: ruby1.9 block scope

namekuseijin wrote:
> On Sep 29, 12:23 pm, Daniel DeLorme <dan...@dan42.com> wrote:
>> Yukihiro Matsumoto wrote:
>>> My vague idea for the issue is that when you see the reference to a
>>> local variable inside of the block, the scope of the variable would be
>>> upgraded to the level of the reference.
>> Do you mean upgrade the scope of the variable dynamically? Is that even
>> possible? I thought that all local vars had their scope pretty much set
>> in stone at the lexical level. But if you could upgrade their scoping
>> level dynamically... that would be nifty indeed!
> 
> Yeah, that would be so... 1970's!
> 
> Even javascript seems to finally have abandoned dynamic scoping in
> favor of friggin' *ALGOL*'s lexical scoping... I wonder why would ruby
> insist on sloppy programming by opening this old can of worms...

Hehe, you have somewhat of a point. Local variables and proper isolation 
  of scope are pretty important to structured programming. But we 
weren't talking about a free-for-all opening of all scopes, just about 
the scope of local variables within *blocks*. I wouldn't much like my 
method-local variables to creep into the global scope just because I 
forgot to define them with "var", no thank you.

--
Daniel