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An exploratory look into functors, applicatives, and monads for Elixir.

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control lib data writer.ex
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lib/data/writer.ex 

defmodule Data.Writer do

  import Control.Monoid



  @type t :: %__MODULE__{

    value: nil,

    log: []

  }



  defstruct value: nil,

            log: []



  def log(%__MODULE__{} = writer, log) do

    writer

    |> Map.update!(:log, &(&1 |> mappend([log])))

  end



  def value(value) do

    __MODULE__

    |> struct(value: value)

  end

end