Advent 2022, day 19.

In order not to have to keep reinventing the wheel, it is useful to create your own functions that can be called up again and again as subprograms.

0:00 - opening credits
0:14 - What are functions?
0:46 - Pass values
2:05 - Application example
3:07 - The first custom function
4:18 - Function with return value