From: mortee <mortee.lists@...>
Date: 2007-10-15T10:46:44+09:00
Subject: Re: Parameter in a block is not local?

mortee wrote:
> SpringFlowers AutumnMoon wrote:
>> [1,2,3,4,5].each {|a| p a}
>>
>> is equivalent to
>>
>> for a in [1,2,3,4,5]
>>   p a
>> end
>>
>> so the "for" version clearly doesn't have a new scope for "a".
>>
>> But in the newest Ruby 1.9, they are not equivalent any more?
>>
> 
> No, they aren't the same even in Ruby 1.8.x either. With the do...end or
> {...} syntax, any variables assigned in the block, but inexisting at the
> point of the definition of the block, are actually local to the block.

I should have pointed out specifically the difference to the for ... in
... end syntax: any local variable created (assigned to) in the latter
construct become part of the enclosing context, so you can actually
create new local variables in such a loop for later use.

mortee