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Extension of the Elixir standard library focused on data stuctures, data manipulation and performance

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aja lib helpers custom_maps.ex
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lib/helpers/custom_maps.ex 

defmodule A.Helpers.CustomMaps do

  @moduledoc false



  @compile {:inline, get_and_update: 3, get_and_update!: 3, do_get_and_update: 4}



  @doc false

  def get_and_update(%map_module{} = custom_map, key, fun) do

    current = map_module.get(custom_map, key)



    do_get_and_update(custom_map, key, fun, current)

  end



  @doc false

  def get_and_update!(%map_module{} = custom_map, key, fun) do

    current = map_module.fetch!(custom_map, key)



    do_get_and_update(custom_map, key, fun, current)

  end



  defp do_get_and_update(%map_module{} = custom_map, key, fun, current) do

    case fun.(current) do

      {get, update} ->

        {get, map_module.put(custom_map, key, update)}



      :pop ->

        {current, map_module.delete(custom_map, key)}



      other ->

        raise "the given function must return a two-element tuple or :pop, got: #{inspect(other)}"

    end

  end

end