Elixir fibonacci #1

fib.exs

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

IO.puts Fib.fib(10)

defmodule Fibonacci do
  def find(n) do
    list = [1, 0]
    fib(list, n)
  end
  
  def fib(_list, n) when n < 0 do
    []
  end

  def fib(_list, 0) do
    [0]
  end

  def fib(list, 1) do
    list
  end

  def fib(list, n) do
    [first_elem, second_elem | _] = list
    fib([first_elem + second_elem | list], n - 1)
  end
end

10 |> Fibonacci.find() |> IO.inspect()

defmodule Fib do
    def run(a, b, n) do
        case n do
            1 ->
                b
            _ ->
                run(b, a + b, n - 1)
        end
    end
end

Fib.run(0,1,10) |> IO.puts()