From: Wayne Vucenic <nightphotos@...>
Date: 2006-12-26T02:57:35+09:00
Subject: Re: Help with a ruby idiom

Hi Devin,

On 12/23/06, Devin Mullins <twifkak@comcast.net> wrote:
> (Though, I tend to use the ||= idiom most often with instance/class
> variables, who don't raise NameError like locals do.)

Not to be picky, but class variables do raise NameError:

C:\>ruby -e "puts @@a"
-e:1: uninitialized class variable @@a in Object (NameError)

C:\>ruby -v
ruby 1.8.2 (2004-12-25) [i386-mswin32]

Personally, the way I remember this is that if there's an even
number of prefix characters before the variable name
(like a or @@a) it raises NameError, but if there's an odd
number (like @a or $a), it doesn't.

Merry Christmas!

Wayne

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Wayne Vucenic
No Bugs Software
Ruby, C# and Erlang Agile Contract Programming in Silicon Valley