I like this one

At first at thought the same! But re-reading the description I understood that's not the case.

It's not asking much, only a possible outcome from a fixed King/Knight position.
7 kyu seems correct to me at least.

So simple, I like it!

Nice!!!

I didn't know about MIN_SAFE_INTEGER.
Also like that you didn't resort to "sort()"

Avoiding sort, nice!

Nice, I like this one.

That's a good point, however the solution it's OK, it passes the Kata... Right?

Maybe open up a suggestion to add that test case?

Nice!
This is what I wanted to see.

I see.

I'll read again about how to log the failed test.

Thank you.

But as far as I understand, 1st test case is supposed to return "true", like my code is; not "false".

From de default test cases:

assert.isTrue(isValidWalk(['n','s','n','s','n','s','n','s','n','s']), 'should return true');

Nice!

I tried to go down this route, but couldn't figure out where to put the $ sign