test elixir `with` syntax #elixir

foo.iex

defmodule Foo do
  def foo(a,b) do
    with {:ok, dob} <- a,
      {:ok, name} <- b
    do
      %{dob: dob, name: name}
    else
      # nil -> {:error, ...} an example that we can match here too
      # err -> err
      _ -> :err
    end
  end
end