thing.ex

defmodule MonadExample do
  def call_me(x) do
    {:ok, 3}
    >>= pow(2) # This does 3^2; 9. :(
    
    {:ok, p} = {:ok, 3}
    pow(2, p) # This does 2^3; 8. :)
    
    go_monads do
      p <- {:ok, 3}
      pow(2, p)
    end
    
    {:ok, p} = {:ok, 3}
    {:ok, b} = {:error, "haha"}
    do_something(p, b) # => Kaboom! MatchError
    
    go_monads do
      p <- {:ok, 3}
      b <- {:error, "haha"}
      do_something(p, b)
    end # => {:error, "haha"}
  end

  def pow(power, base), do: :math.pow(base, power)
end