Re: [Q] newbie questions about timestamp, character code, ..

["Makoto Kuwata" <kwa@...>]

Thanks all,

* I'm trying luafilesystem
* I use 'string.byte("x")'
* It is not able to set nil into table as 'valid' value. It is a rule of Lua.

I appreciate your helps.

--
regards,
kwatch


On 2/9/07, Philippe Lhoste <PhiLho@gmx.net> wrote:
> Jerome Vuarand wrote:
> > Gergo Szakal wrote:
> >> if table[key] then ... end
> >>
> >> means that if the given key in the table is non-nil, then...
> >
> > Note that false is a valid table value, and in that case the test above
> > will fail. To be sure a key is not used check explicitly against nil.
>
> Yes, that's a bad habit from C (or older Lua versions...).
> I always test explicitly against nil, even when there is no ambiguity,
> and use the if foo then only with variables I know being booleans.
> Idem in other languages, whatever their tolerance for this idiom.
> Just a personal policy, of course.
>
> --
> Philippe Lhoste
> --  (near) Paris -- France
> --  http://Phi.Lho.free.fr
> --  --  --  --  --  --  --  --  --  --  --  --  --  --