How to get values out of a nested map

Again for sake of completeness, it seems as if you could use Map.get/3 here too.

defmodule Geocoder.Bounds do
  defstruct [:bottom, :left, :right, :top]
end

defmodule Geocoder.Location do
  defstruct [
    :city,
    :country,
    :country_code,
    :formatted_address,
    :postal_code,
    :state,
    :street,
    :street_number
  ]
end

defmodule Geocoder.Coords do
  defstruct [:bounds, :lat, :location, :lon]
end

defmodule Test do
  alias Geocoder.{Bounds, Location, Coords}

  def new() do
    b = %Bounds{bottom: 43.19, left: -86, right: -86, top: 43}

    l = %Location{
      city: "abc",
      country: "usa",
      country_code: "usa",
      formatted_address: "",
      postal_code: "49444",
      state: "Michigan",
      street: "Amsterdam",
      street_number: nil
    }

    {:ok, %Coords{bounds: b, lat: 43.1, location: l, lon: -86.2}}
  end

  def get_lat() do
    g = new()
    elem(g, 1) |> Map.get(:lat)
  end

  def get_lon() do
    g = new()
    elem(g, 1) |> Map.get(:lon)
  end
end

Although I think @dogbert's approach is better, I offer this again just to offer a potential alternative.

BTW, I know I didn't use all the same values as your sample code but I was getting tired of copy/pasting the code from your example. And the differences in that shouldn't be salient anyway.