with-sad-path

sad_path.ex

some_map = %{foo: "bar", ping: "pong", ding: "dong"}
    
with :error <- Map.fetch(some_map, :nope),
     :error <- Map.fetch(some_map, :nada),
     :error <- Map.fetch(some_map, :nilch) do
      "default value"
    else
      {:ok, value} -> value
    end
    
#> "default value"

with :error <- Map.fetch(some_map, :nope),
     :error <- Map.fetch(some_map, :nada),
     :error <- Map.fetch(some_map, :ping) do
      "default value"
    else
      {:ok, value} -> value
    end
#> "pong"