From: Ilmari Heikkinen <kig@...>
Date: 2005-01-21T03:01:02+09:00
Subject: Re: Confused about variable "declarations"


On 20.1.2005, at 19:31, Robert Klemme wrote:

>
> "Mark Hubbart" <discordantus@gmail.com> schrieb im Newsbeitrag
> news:de63abca050120090877cc9971@mail.gmail.com...
>> On Thu, 20 Jan 2005 21:01:01 +0900, Graham Nicholls
>> <graham@rockcons.co.uk> wrote:
>>> No worries, and thanks, but I think that the problem was that offset
> is
>>> being set inside an iterator (they still confuse me - any pointers to
> a
>>> good explanation would be nice!), which means that it is out of scope
>>> outside the iterator.
>>
>> A short explanation: Blocks have a sort of "leaky scope", where
>> variables from outside the scope can leak in and out, but those that
>> are from the inside don't leak out. for example:
>
> While I completely agree with your explanation the word "leaky" 
> strikes me
> as odd as it seems to suggest  uncommon or defective behavior: it's 
> very
> common in programming languages, that variables are visible in nested
> scopes but not surrounding scopes:
>

This may be the leaky case:

x = 10
arr = (x..100).map{|x| x*2}
x #=> 100

:)

--
Ilmari Heikkinen