A code that creates n processes

chain.exs

# How does it work? 
# $ elixir -r chain.exs -e "Chain.run(1000)" to have one thousand processes.
defmodule Chain do 

	def counter(next_pid) do 
		receive do 
			n -> send next_pid, n + 1
		end 
	end

	def create_processes(n) do 
		last = Enum.reduce 1..n, self, 
				fn (_,send_to) -> 
					spawn(Chain, :counter, [send_to])
				end 

		send last, 0

		receive do 
			final_answer when is_integer(final_answer) -> "Result is #{inspect(final_answer)}"	
		end
	end

	def run(n) do 
		IO.puts inspect :timer.tc(Chain, :create_processes, [n])
	end

end