You showed 2 9x9 mazes

Personally, I find loops harder to read and just as error prone as regular expressions. And it's a nice opportunity to practice them regexes :)

Grids are always square. This is not one grid.

In the update for Node 18.x I have also improved the tests output. This won't happen after that is approved.

That would certainly be more cerebral.

However, where do you draw the line? Writing you own upperCase, min, max, etc functions? If the language supports it, out of the box, then it's out there to be used.

I'm stuck with this kata for 3 days and then this :,c

it can, if its printed by two separate tests.

even if you print only once, but your solution is called twice, then two mazes will be printed.

print some additional separator after each maze and see if this changes anything.

Are you sure its a one maze, and not two mazes printed one after another?

I now have an idea how to do this, thank you for the comment ! Are there any good resources you would recommend that treat this subject ?

I think my code broke this kata

No, you just hardcoded the answer

The goal of the kata is very simple and straightforward.

Define omniBool so that it returns true for the following:

omniBool == true && omniBool == false

That is all that is required and the tests are sufficient for this purpose.

That happens when there aren't random tests (I've created an issue 3 years ago, it's still open).

Individual letters' case matters:

1. "a" turns caps on
2. "b" becomes "B" (lowercase + caps = uppercase)
3. "A" turns caps off
4. "B" stays "B" (uppercase = uppercase)
5. "a" turns caps on
6. "B" becomes "b" (uppercase + caps = lowercase)
7. etc.