How do you use (...) with a function?

Variadic arguments
Is it okay if I bring friends?

The ... signifies that the function can take multiple arguments, which get stuck into a tuple represented by the varargs ... variable. There are several ways to use this:

• To unpack them into variables

function vari(arg1, ...)
	local arg2, arg3, arg4 = ...
end

• To iterate through them

function vari(...)
	local args = {...} -- Pack into a table
	for k,v in next, args do -- Iterate
		print(k,v)
	end
end

• To pass them on to another function

function vari(...)
	print("Banana cupcakes:", ...)
	print(...)
end

"Where did I see it?"
The code probably looks a little like this:

local deb = false;
function debounce(f,...)
	if deb then return end;
	deb = true;
	local ret = {f(...)};
	deb = false;
	return unpack(ret)
end

Which debounces a function and returns everything from it. If you're interested, unpack also returns a tuple similar to ...