How to convert map keys from strings to atoms in Elixir

Question

What is the way to convert %{\"foo\" => \"bar\"} to %{foo: \"bar\"} in Elixir?

Answer 1

There's a library for this, https://hex.pm/packages/morphix. It also has a recursive function for embedded keys.

Most of the work is done in this function:

defp atomog (map) do
    atomkeys = fn({k, v}, acc) ->
      Map.put_new(acc, atomize_binary(k), v)
    end
    Enum.reduce(map, %{}, atomkeys)
  end

  defp atomize_binary(value) do 
    if is_binary(value), do: String.to_atom(value), else: value
  end

Which is called recursively. After reading @Galzer's answer I'll probably convert this to use String.to_existing_atom soon.