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- Subject: Re: functions and upvalues
- From: "Will Leshner" <will.leshner@...>
- Date: Thu, 31 May 2007 12:53:07 -0700
On 5/31/07, Wesley Smith <wesley.hoke@gmail.com> wrote:
What I'd like is f1's val upvalue to refer to constructor's local
variable val. Is this possible somehow through environments?
It looks like you are expecting dynamic scoping, but I believe Lua
uses static scoping (which is actually a really good thing as upvalues
and closures wouldn't work at all with dynamic scoping).
Wikipedia appears to have a pretty good page describing the difference
between dynamic and static scope, and there's even an example they use
to compare the two that looks a lot like your example. The page in
question is here:
<http://en.wikipedia.org/wiki/Scope_(programming)>
