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

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funx lib monoid pred_all.ex
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lib/monoid/pred_all.ex 

# credo:disable-for-this-file



defmodule Funx.Monoid.Predicate.All 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%2Fpred_all.livemd)



  A Monoid implementation for combining predicates using logical AND.

  """

  defstruct value: &Funx.Monoid.Predicate.All.default_pred?/1



  def default_pred?(_), do: true

end



defimpl Funx.Monoid, for: Funx.Monoid.Predicate.All do

  alias Funx.Monoid.Predicate.All



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



  def append(%All{} = p1, %All{} = p2) do

    %All{

      value: fn value -> p1.value.(value) and p2.value.(value) end

    }

  end



  def wrap(%All{}, value) when is_function(value, 1) do

    %All{value: value}

  end



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

end