How to respawn objects at random side and random alternately using factory?

Questions
4

So when an object goes outside the top of the screen it should be spawned at the bottom again?

function update(self, dt)
	local pos = go.get_position()
	-- move up 10 pixels/second
	pos.y = pos.y + 10 * dt
	-- if position is outside top edge of screen then move it to the bottom
	if pos.y > your_screen_height_here then
		pos.y = 0
	end
	go.set_position(pos)
end
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