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- Subject: Re: new "empty" value/type in Lua?
- From: Coda Highland <chighland@...>
- Date: Mon, 1 Jul 2013 12:20:31 -0700
On Mon, Jul 1, 2013 at 12:16 PM, Hisham <email@example.com> wrote:
> On 1 July 2013 15:04, Roberto Ierusalimschy <firstname.lastname@example.org> wrote:
>>> Couldn't a lot of ambiguity and unexpected behavior avoided by keeping
>>> nil but introducing two new functions to the table library called
>>> "table.has(t,key)" and "table.delete(t,key,[to])" - and dropping the
>>> deletion via assigning nil?
>> At last something new and worth a discussion. Does anyone see problems/
>> incompatibilities/etc. with this?
> If I'm following correctly, code that uses t[k] = nil to clean up
> parts of a table would behave the same, but take up more memory,
> unless modified to use table.delete() ? If so, that would turn a
> "standard practice" into a compatible, but "bad practice"... I agree
> with Javier that this would be a major change. I don't know if I like
> the whole proposal or not, but this point I raised does sound like a
> problem to me.
> -- Hisham
This is a valid point and it makes me wonder if perhaps there needs to
be an opt-in mechanism similar to creating a weak table.