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A dependency-free utility library containing 100+ useful functions.

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moar lib tuple.ex
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lib/tuple.ex 

defmodule Moar.Tuple do

  # @related [test](/test/tuple_test.exs)



  @doc """

  Converts a list of tuples to a single tuple where the first element is the first element of the first tuple,

  and the second element is a list of the second elements of each tuple.

  Raises if the first element in each tuple is not homogeneous.



  ```elixir

  iex> Moar.Tuple.from_list!([{:ok, :a}, {:ok, :b}])

  {:ok, [:a, :b]}



  iex> Moar.Tuple.from_list!([{:a, 1}, {:a, 2}, {:a, 3}])

  {:a, [1, 2, 3]}



  iex> Moar.Tuple.from_list!([{:a, 1}, {:b, 2}, {:a, 3}])

  ** (RuntimeError) Expected all items in the list to have have the same first element, but got: [:a, :b]

  ```

  """

  @spec from_list!([any()]) :: {any(), [any()]}

  def from_list!(list) do

    {keys, values} = Enum.unzip(list)



    case Enum.uniq(keys) do

      [key] -> {key, values}

      keys -> raise "Expected all items in the list to have have the same first element, but got: #{inspect(keys)}"

    end

  end

end