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

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funx lib monoid max.ex
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lib/monoid/max.ex 

defmodule Funx.Monoid.Max do

  @moduledoc """

  [![Run in Livebook](https://livebook.dev/badge/v1/black.svg)](https://livebook.dev/run?url=https%3A%2F%2Fgithub.com%2FJKWA%2Ffunx%2Fblob%2Fmain%2Flivebooks%2Fmonoid%2Fmax.livemd)



  A Monoid implementation for maximum values.

  """



  defstruct value: nil, ord: Funx.Ord.Protocol

end



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

  alias Funx.Monoid.Max



  def empty(%Max{value: min_value, ord: ord}) do

    %Max{value: min_value, ord: ord}

  end



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

    %Max{value: Funx.Ord.max(a, b, ord), ord: ord}

  end



  def wrap(%Max{ord: ord}, value) do

    %Max{value: value, ord: Funx.Ord.to_ord_map(ord)}

  end



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

end