I don't think this is truly resolved. For the first tranche ("Trailing zeroes of") of tests in JavaScript, the parameters are always (num: 6, base: 16)

Can I hint others to 3 katas to solve before this one?

The first kata is already in the description

The second kata is about base conversion

The third kata is about primes

Those 3 katas would help a lot before solving this one

And thanks again for your help

Thanks a lot. I really appreciate this kata.

I found another thing that would help in understanding this kata

Do you mind if I shared 3 hints to solve this kata?

2 of them are already provided, the first is the kata in the details of solving this kata

The second kata is here in this comment

And I got a rough idea on how to solve this kata

so I have a third kata that could be solved before this because the 3 of these katas contribute to solving this kata

Solve this as well if you haven't already, this is just a generalised version of that.

The one I linked relates because you'll want arbitrary base conversion code for figuring out this one.

Thanks I solved that kata after you suggested it,
but didn't really understand how to relate it with this kata.

If you haven't implemented base conversion before then you should start with that first.

Here is a kata that might help you with that.

Is there any software that I can use to calculate a number to a different base, so that I can spot differences?

And is there any hint one could give to understand the problem

Chai+assert+bigints for JS

JS tests should use BigInt and be un-nerfed compared to Python.

JS tests are fine.

I think something broke with the basic test in JS, they all want 1 as output when random tests work fine

Fixed

Fixed

15! in base 12 is 191529600000, which has 5 trailing zeroes.