Rob Kinyon wrote:
On 5/18/05, Stuart Cook <[EMAIL PROTECTED]> wrote:$rod == none(@Larry), and therefore just because I think it should be that way, doesn't mean it is that way.
To summarise what I think everyone is saying, -reducing an empty list yields either:
1) undef (which may or may not contain an exception), or 2) some unit/identity value that is a trait of the operator,
depending on whether or not people think (2) is actually a good idea.
I would think that the Principle of Least Surprise points to (1),
given that the standard explanation of the [EMAIL PROTECTED] is eval join( '+', @x
But the "eval join" way of looking at it does seem to be consistent with what I've seen discussed previously, and would provide a useful way to remember the effects of edge cases.
-- Rod Adams