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Functional programming abstractions for Elixir (Beta release: APIs may change before 1.0)

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funx lib monoid string_concat.ex
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lib/monoid/string_concat.ex 

defmodule Funx.Monoid.StringConcat do

  @moduledoc """

  A Monoid implementation for concatenating strings.



  This monoid uses binary string concatenation (`<>`) as its associative operation

  and `""` (empty string) as the identity element.

  """



  @type t :: %__MODULE__{value: String.t()}



  defstruct value: ""

end



defimpl Funx.Monoid, for: Funx.Monoid.StringConcat do

  alias Funx.Monoid.StringConcat



  @spec empty(StringConcat.t()) :: StringConcat.t()

  def empty(_), do: %StringConcat{value: ""}



  @spec append(StringConcat.t(), StringConcat.t()) :: StringConcat.t()

  def append(%StringConcat{value: a}, %StringConcat{value: b}) do

    %StringConcat{value: a <> b}

  end



  @spec wrap(StringConcat.t(), String.t()) :: StringConcat.t()

  def wrap(%StringConcat{}, value) when is_binary(value), do: %StringConcat{value: value}



  @spec unwrap(StringConcat.t()) :: String.t()

  def unwrap(%StringConcat{value: value}), do: value

end