Coding at 6am isn't fun (Advent of Code days 2-5)

Advent of Code is still going strong!
This episode is my attempts at solving the tasks from days 2-5. Enjoy!

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Chapters:
0:00 - Introduction
0:16 - Day 2 part 1
1:49 - Day 2 part 2
2:23 - Day 2 refactoring
3:08 - Day 3 part 1
5:31 - Day 3 part 2
9:49 - Day 3 refactoring
15:40 - Day 4 part 1
21:25 - Day 4 part 2
22:28 - Day 4 refactoring
28:02 - Day 5 part 1
32:25 - Day 5 part 2
34:16 - Day 5 refactoring
37:48 - Outro

Relevant links:

[avalagum]

Again, your video reminds me of a feature that I never used: case s"down $n" => Down(n.toInt)
I really like the format of this video: your typing is fast-forwarded (i.e. I don't have to watch you type each character).
Then I get lost when monad is introduced :(
Anyway, I think this is a very good video. Thank you very much.

[ZegarekOszczypa]

Hi Jakub! I would like to ask you a question about the solution to day 4th. What happens underneath that calling 'E.raise' with the winning board immediately interrupts traversing the list with called numbers. Does it have something to do with the Stateful type class?

[benkio]

I would suggest going to sleep at 9pm so you will be fresh at 6am :D Good job

[henryomarm]

what generates that auto error message like the one in @31:06