On Tue, 15 Jun 2004 07:47:06 +0900, you wrote:

>testing whether diff is defined won't work in ruby anyway. Any time you 
>have an expression like this:

>   foo = 23 if expression

>foo ends up being automagically defined anyway. After running that 
>code, if expression is false, foo == nil.

yeah, like i said undef would be great :)

>So, as Sean says, it would probably be better to use nil, unless 
>Delta_DHMS might return nil itself.

that was just one method from an external perl module, and i when
successful returns an array...not sure if it can return a null or
not...either way it's just as easy to use defined/undef in perl...