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Section

defmodule Fib do
  @doc ~S"""
    Calculate Fibonacci

    ## Examples
      iex> Fib.fib(0)
      0

      iex> Fib.fib(1)
      1

      iex> Fib.fib(2)
      1

      iex> Fib.fib(3)
      2
  """

  def fib(0), do: 0
  def fib(1), do: 1

  def fib(n) do
    Process.sleep(:timer.seconds(1))
    fib(n - 1) + fib(n - 2)
  end
end

R = 3,
S = 1,

Add = fun(A,B) -> A + B end,

Add(R,S).

binding()

add.(r, s)