Hi,
I am relatively new to Elixir and need a support from more advanced users.
I try to do a simple thing → Flatten Map
But Elixir and functional programming in general is a bit new to me.

I found online a solution, but it looks overcomplicated.
I wonder if maybe there is a solution out of the box provided by the language.
I tried to find something like Map.flatten(%{a: 1, %{b: 2}}) but with no success.

It would be great if you could advice that is the best practice ?

Meanwhile, I found the solution online, please see the code below.

defmodule Json do
  def flatten(%{} = json) do
    json
    |> Map.to_list()
    |> to_flat_map(%{})
  end
  def flatten(%{} = json) when json == %{}, do: %{}

  defp to_flat_map([{_k, %{} = v} | t], acc), do: to_flat_map(Map.to_list(v), to_flat_map(t, acc))
  defp to_flat_map([{k, v} | t], acc), do: to_flat_map(t, Map.put_new(acc, k, v))
  defp to_flat_map([], acc), do: acc
end

%{id: "1", foo: %{bar: %{qux: "hello world"}, baz: 123}}
|> Json.flatten()
|> IO.inspect()

# %{baz: 123, id: "1", qux: "hello world"}

Currently, due to a lack of knowledge I can’t evaluate this solution.

I would highly appreciate if someone could comment on the above code and mention good and bad points ?