Elixir: rename_keys

Elixir equivalent of Clojure rename_keys()

  @doc """
  Returns the map with the keys in kmap renamed to the values in kmap.
  """
  def rename_keys(map, kmap) when is_map(map) and is_map(kmap) do
    for {key, value} <- map,
        into: %{},
        do: if(new_key = Map.get(kmap, key), do: {new_key, value}, else: {key, value})
  end