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- Subject: Re: Local and Global Variables
- From: Steve Litt <slitt@...>
- Date: Sat, 27 Apr 2013 05:08:11 -0400
On Sat, 27 Apr 2013 06:33:02 +0200
Dirk Laurie <firstname.lastname@example.org> wrote:
> 2013/4/26 Steve Litt <email@example.com>:
> > I can't think of any reason for a global variable's
> > existence to be conditional.
> That's because you are accustomed to having no distinction between
> nonexistent and nil-valued global variables. Highly convenient.
Under what circumstances would the distinction between nonexistant and
nil-valued globals be convenient?
> The main difference _in practice_ between a local and a global
> variable is that `local x` (which is syntax sugar for `local x=nil`)
> fixes the point on the main Lua stack where `x` will be stored. It
> uses up one of the precious 200 slots in the current stack frame that
> are available for the purpose.
LOL, the day I use 200 variables in one function, you should shoot me
and put me out of my misery. Long before I got to 200, just for the
wellbeing of my brain, I'd arrange them in data structures, which for
the purposes of Lua means tables suitably nested.
Steve Litt * http://www.troubleshooters.com/
Troubleshooting Training * Human Performance