Best practice

Using Enum.map_join/3 is more efficient than using Enum.map/2 |> Enum.join/2.

Calendar.ISO.day_of_week/3 is already deprecated. Please use Calendar.ISO.day_of_week/4 instead.

Using Enum.into/3 is more efficient than using Enum.map/2 |> Enum.into/2.

The syntax use Bitwise is already deprecated. Please use import Bitwise instead.

The bitwise operator (^^^) is already deprecated. Please use Bitwise.bxor($LEFT, $RIGHT) instead.

The bitwise operator (^^^) is already deprecated. Please use Bitwise.bnot($VAL) instead.