variable existence checking

[Thorsten Haude]

Hi,

* Tony Balinski wrote (2007-05-29 15:02):
>Another route would be to allow undefined as a pseudo-value in variables (an
>actual value in simple variables, possibly just a sign of a missing index in
>arrays) that you could pass to functions etc, test against and assign using.
>This would move things a little closer to Perl, say, where undefined values do
>more than cause failure.

We had a lengthy discussion about this attached to one of TK's patches
for exactly this. I don't mind much either way if we introduce a -w
parameter along with it, that's what I always use in Perl.


Thorsten
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