Does RBXLua have factorials?

Hey guys,

I was in the middle of writing a code until I realised that I needed to use factorials (x!) to carry out a calculation. I noticed that the Wiki didn't help much. Does anyone know how to use factorials in Lua?

If you're unsure by what I mean with "factorial", it is a mathematical operation where x is continuously multiplied by x-1 until x=1

Example:

(4! = 4 x 3 x 2 x 1 = 24) and (5! = 5 x 4! = 5 x 24 = 120 (or 5 x 4 x 3 x 2 x 1))

While other answer works just fine, I'm not sure why would you complicate it like that, and make it slower.

This function does exactly same, but is faster and simpler:

function fact( n )
	local ret = 1
	
	-- Simply loop through all the numbers, and multiply them together
	for num=1, n do
		ret = ret * num
	end

	return ret
end

Here is both function comparision: https://repl.it/CAUb

I don't believe Lua comes with such a function, but a quick search came up with this:

    function fact (n)
      if n == 0 then
        return 1
      else
        return n * fact(n-1)
      end
    end

Which you can just use like so:

print(fact(5)) -- Prints '120'

Also, I have now been educated on factorials. I guess that's good?