Re: Question about use of local and Lua 5.2 optimization

[Francisco Olarte <folarte@...>]

On Thu, Jun 1, 2017 at 11:24 PM, Martin <eden_martin_fuhrspam@gmx.de> wrote:
> On 05/31/2017 06:11 PM, Andrew Starks wrote:
...
>> An upvalue is a local that has been declared in a parent scope and not
>> covered over by a local declaration:

> Function parameters are upvalues too. This looked quite strange to me.
> local f =
>   function(a)
>     return
>       function()
>         a = a + 1
>         return a
>       end
>   end
> local counter = f(0)
> print(counter(), counter())

Doesn't look weird to me. a is local to f, the outer function, (
parameters act like automagically initialized locals in many languages
) , so it is an unconvered local in the parent scope ( which is the
outer function body ) of the inner function.

Francisco Olarte.