Re: lexical scoping
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- Subject: Re: lexical scoping
- From: Edgar Toernig <froese@...>
- Date: 2001年9月08日 03:41:05 +0200
RLake@oxfam.org.uk wrote:
>
> > for k, v in tab do
> > local v = v
>
> I think this means I have to go through a bunch of my code, adding
> local x=x
> wherever I find %x.
Hmm... there are two other possible solutions:
a) just define that the iteration variables of the for-loop are
instantiated for each iteration of the loop. That way you always
get the behavior as if a "local k,v = k,v" is present. Or,
b) just keep the %-syntax for upvalues to get the value the names
had at function declaration time.
> I actually quite liked the fact that Lua does functional (in the
> functional programming sense) closures. I'll miss it -- but I guess
> I'm in the minority.
The upvalues have some nice properties. But if Roberto gets full
featured closures without performance sacrifices I would prefer them.
They are much more powerful.
Ciao, ET.