From: Eric Mahurin <eric_mahurin@...>
Date: 2005-09-29T00:59:01+09:00
Subject: Re: creating independent lambdas in loops

--- Eric Mahurin <eric_mahurin@yahoo.com> wrote:
> I'm talking about specifically block arguments (the only
> variables in a block that can be local to the block).

Sorry, the above statement is wrong.  After doing some irb
experiments I was thinking that only block arguments made local
variables.  My mistake was that I assumed that the code in a
for/in statement was just like a block.  Even though it uses
#each, I guess the block it gives to each is a different beast:

[1,2,3,4].each do |x| y = x end
p x # undefined local variable or method
p y # undefined local variable or method

for x in [1,2,3,4]; y = x; end
p x # -> 4
p y # -> 4

[1,2,3,4].each do |x| y = x end
p x # -> 4 # for loop defined x before this each loop
p y # -> 4 # for loop defined y before this each loop

It still seems like there should be a way to controll variable
locality in blocks better.  Making the variable local just
based on whether the variable already exists in the outer scope
doesn't cut it.



		
__________________________________ 
Yahoo! Mail - PC Magazine Editors' Choice 2005 
http://mail.yahoo.com