OK it's not going to take much to sort this out, all I would have to do to pass your test case is to replace the 0 in the array to 1 and ignore the map function as javascript will does the necessary conversion in the reduce part. I am not sure how long ago I wrote this solution but I am sure I was new to the language, but thank you for highlighting the shortcomings with this solution thank you. Now if you can check the outs I have done that would be appreciated

Yes, it is working. Because cata has bad tests :)
Okay, n is always positive, so it would never be 0.

But you can try something else, for example - 40585.

// 4! = 24
// 0! = 1
// 5! = 120
// 8! = 40320
// 5! = 120

Correct => 24 + 1 + 120 + 40320 + 120 = 40585
In your case => 24 + 0 + 120 + 40320 + 120 = 40584 (wrong...)

This solution is fine for the kata requirements, because the n is always positive, so it would never be 0.

Oh OK the solution works so I am not bothered really. I can't remember how long ago I wrote this tbh. It still managed to get 6 best practice recommendations and 5 clever so I am cool with it

Yes, it is a comment on your solution.

I am confused is this comment regarding my solution

Wrong, try strong(0). It will return 'STRONG!!!!', but 0! = 1, so 0 != 1...
Also, the map is not necessary