From: "Peña, Botp" <botp@...>
Date: 2007-10-19T13:59:09+09:00
Subject: Re: combinations listing

From: mortee [mailto:mortee.lists@kavemalna.hu] 
# However, I'd ask why are you using class variables
# (ones starting with @@)? At least in its current form, 
# your solution seems quite procedural, so it seems like
# simple local variables would suffice.

nope. outside locals wont be visible inside methods.

> x=1
=> 1
> def test
>   p x
> end
=> nil
> test
NameError: undefined local variable or method `x' for main:Object

> @@x=1
=> 1
> def test
>   p @@x
> end
=> nil
> test
1
=> nil


# You only need @@ if you want some value to be shared by all
# instances of a given class.

sometimes i use it in place of constants or globals (since constants give warnings and globals are... gloables :)

kind regards -botp