Re: just a little question about the lua way :)

[Andreas Stenius <kaos@...>]

-- try this to get tail call
function sumofn( sum, x, ... )
	if not x then return sum end
	return sumofn( sum + x, ... )
end

-- or the 5.0 version
function sumofn( sum, x, ... )
	if not x then return sum end
	return sumofn( sum + x, unpack(arg) )
end

But for this I would use the for-loop..

Asko Kauppi wrote:
> Going for it myself:
>
> -- Returns the sum of all given values (using tail recursion)
> --
> function sumofn( a,b, ... )
>     --return b and sumofn(a+b,...) or a or 0    -- not proper tail call  
> (but works)
>     return (not b) and (a or 0) or sumofn(a+b,...)    -- proper tail call
> end

Since the above wasn't proper tail calls after all (acording to Roberto)