Packages

funx

0.2.0
0.8.8 0.8.7 0.8.6 0.8.5 0.8.4 0.8.3 0.8.2 0.8.1 0.8.0 0.7.1 0.7.0 0.6.1 0.6.0 0.5.0 0.4.2 0.4.0 0.3.0 0.2.3 0.2.2 0.2.1 0.2.0 0.1.7 0.1.6 0.1.5 0.1.4 0.1.3

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

HexDocs

Current section

Files

Jump to
Readme
26 Versions
1 Dependency
Dependants
Files
Activity
funx lib monoid list_concat.ex
Raw

lib/monoid/list_concat.ex 

defmodule Funx.Monoid.ListConcat do

  @moduledoc """

  A Monoid implementation for concatenating lists.



  This monoid uses list concatenation as its associative operation

  and `[]` as the identity element.

  """



  @type t :: %__MODULE__{value: list()}



  defstruct value: []

end



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

  alias Funx.Monoid.ListConcat



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

  def empty(_), do: %ListConcat{}



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

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

    %ListConcat{value: a ++ b}

  end



  @spec wrap(ListConcat.t(), list()) :: ListConcat.t()

  def wrap(%ListConcat{}, value) when is_list(value), do: %ListConcat{value: value}



  @spec unwrap(ListConcat.t()) :: list()

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

end