Re: Question about 5.0 for loop

[Tom Wrensch <twrensch@...>]

Thanks, I'd misread "explist" as just the function. You'd think I'd notice
the "list" part! It makes a lot more sense now.

  - Tom

On Thu, 6 Jun 2002, Roberto Ierusalimschy wrote:

> > But I don't see any way _s could ever be modified
> 
> It is not. Maybe the name "state" is misleading. Actually, there are two
> "states": _s and `var1'. _s is fixed (e.g. the table or the file you are
> traversing), while `var1' varies.
> 
> Notice that we start with
> 
> >          local _f, _s, var_1 = explist
> 
> so we do have a way to assign a value to _s. nexti(t), for instance,
> returns a function *and* `t' ;-)
> 
> For several simple iterations such state is enough (e.g. traversing tables,
> reading the lines of a file, etc.). For more complex ones, you can
> either use a closure or put a table in _s (and as much state as you want
> inside the table).
> 
> -- Roberto
>