フィボナッチ数列の50番目をとるやつ　For Elixir

fibo.exs

defmodule Memorize do
  def fib(0), do: 0
  def fib(1), do: 1
  def fib x do
    case Agent.get(__MODULE__, &Map.get(&1, x)) do
      nil ->
        f = fib(x - 1) + fib(x - 2)
        Agent.update(__MODULE__, &Map.put(&1, x, f))
        f
      f -> f
    end
  end

  def start_agent do
    Agent.start_link &Map.new/0, name: __MODULE__
  end
end

Memorize.start_agent
Memorize.fib(50)
|> IO.inspect

fibo100000.exs

defmodule Memorize do
  def fib 0 do
	0
  end

  def fib 1 do
	1
  end

  def fib x do
	case Agent.get(:fib_memo, &Map.get(&1, x)) do
	  nil ->
		v = fib(x - 1) + fib(x - 2)
		Agent.update(:fib_memo, &Map.put(&1, x, v))
		v

	  v -> v
	end
  end

  def start_agent do
	Agent.start_link &Map.new/0, name: :fib_memo
  end
end


Memorize.start_agent
IO.inspect Memorize.fib 100000

fibobo.exs

defmodule Fib do
  def fib(0), do: 0
  def fib(1), do: 1
  def fib(n), do: fib(n - 1) + fib(n - 2)
end

Fib.fib(50)
|> IO.inspect