From: Pat Maddox <pergesu@...>
Date: 2007-10-15T02:00:53+09:00
Subject: Re: Parameter in a block is not local?

On 10/14/07, SpringFlowers AutumnMoon <summercoolness@gmail.com> wrote:
> I thought a iterator with a block is like an nameless function call...
> so if it is a function call, the parameter is local.
> but for the following, the output is surprising:
>
> a = 1
> p a
>
> 1.upto(10) {|a| p a}
>
> p a
>
> --------------
>
> E:\>ruby test_iterator.rb
> 1
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> 8
> 9
> 10
> 10
>
> a is changed!
>
> but is it true that the "a" is not global to begin with....
> but then, isn't the "a" inside the block more local than the "a"
> outside?
>
> like in Pascal, i think there can be nested functions and therefore,
> there will be local and then "local that is more local" than the outer
> local.
> --
> Posted via http://www.ruby-forum.com/.
>
>


This seems to me along the same lines as

a = 1
if true
  a = 10
end
p a  # => 10

Which certainly is not surprising or unwelcome.

Pat