Re: Select (Switch) Case statement

[Warren Merrifield <wmerrifield@...>]

True, that does look very cryptic, but if you wrap it all up with real
names, I think that it's not too odd, really. And learning to think
like this is a key to using Lua well, IMHO. I've used the foo["bar"]
syntax here, rather than foo.bar, as I think it's clearer in this
instance.

-- Example switch. I've put it inside it's own function for clarity.
function doswitch(case)
    -- I'll assert here, but you could default by calling another
    -- function if the case argument is nil.
    assert(type(case)=="string");

    local switch = {};
    switch["attack"] = function()
        -- Either write the attack behaviour in here, or refer to
        -- an external function library here.
    end

    switch["defend"] = function()
        -- Either write the defend behaviour in here, or refer to
        -- an external function library here.
    end

    return switch[case]();
end

-- Example usage
state = "attack";
action = doswitch(state);

On Wed, 1 Sep 2004 18:38:54 +0300, Asko Kauppi <asko.kauppi@sci.fi> wrote:
> 
> Face it, that looks really cryptical for the newcomer.
> 
> Personally, I would welcome select/case/default into the language, but
> then again, using lookups (in other ways than what you describe here)
> generally diminishes the need itself for a switch statement.  But it
> wouldn't hurt, either.
> 
> -ak
> 
> 1.9.2004 kello 18:00, David Given kirjoitti:
> 
> 
> 
> >  I may be being a killjoy, but:
> >
> > ({
> >       [0] = function ()
> >               print(0)
> >       end,
> >
> >       [1] = function ()
> >               print(1)
> >       end
> > }[value] or function ()
> >       print("default")
> > end)()
> 
>