> On Mon, 12 Oct 2009 23:16:12 +0200
> André Ericsson <
eandre@gmail.com> wrote:
>
>> local LOCAL_ToStringAllTemp = {};
>> function tostringall(...)
>> -- etc...
>
> That's rather ugly.
>
> I've learned that recursion isn't a dirty word in Lua, so it's not at
> all difficult to write a 'map' function
>
> function map(f,...)
> if select('#',...) == 0 then return end
> return f((...)),map(f,select(2,...))
> end
>
> Which could be optimized to use local variables only. However, that does
> demonstrate one thing about Lua that I didn't expect. This...
>
> return something, F()
>
> ... isn't a tail-call. I thought it would be, but the comma operator is
> enough to prevent the optimization. I think it would be a worthwhile
> change to the VM to allow a tail-call in this case.
>
> A function that I think is better done in C than Lua is a
> complement to 'select', which could be called 'shift'.
> shift(n,...) returns the values that select(n+1,...) skips over.
>
> -- tom
>
telliamed@whoopdedo.org
>
