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Mixins for Elixir namespaces and Misc utility functions

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kitchen_sink lib kitchen_sink list index_by.ex
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lib/kitchen_sink/list/index_by.ex 

defmodule KitchenSink.List.IndexBy do

  @moduledoc false



  @doc """

  creates and indexed list from a list of maps using a key_function or

  a path. if a path is given then the access module will be used.



  This function is very similar to group_by, however the values will

  not be grouped. there should be a 1-to-1 mapping for the key_fun to

  item in the list. if it's possible that you could have a different

  mapping ratio, dupe keys will be dropped, according to Map.new logic

  """

  def index_by(list, key_fun) when is_function(key_fun) do

    indices = Enum.map(list, key_fun)

    Enum.zip(indices, list) |> Map.new()

  end

  def index_by(list, path) do

    index_path = List.wrap(path)

    indices = get_in(list, [Access.all() | index_path])

    Enum.zip(indices, list) |> Map.new()

  end

end