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Elegant error/exception handling in Elixir, with result monads.

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ok lib foo.ex
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lib/foo.ex 

defmodule Foo do

  import OK, only: ["~>>": 2]



  def double(a) do

    {:ok, 2 * a}

  end



  def foo(num) do

    # num = 3

    {:ok, num}

    ~>> double() # <<< complains on this line <<<<



    {:ok, 1}

    ~>> double() # <<< does NOT complain about this

  end

end