It could have been nice to create our own class Fighter, as I wanted to create a method Attack(Fighter defender) that would return true if the other died on that hit...

It's non sensical when it's not specified. ;)

I cannot edit the kata for now (7 days delay)

Doing something in place and returning it isnt that nonsensical, js does it with sort to support chaining. If you feel something isnt as perfect as you need it, change it, this is an old kata and Im not active on here anymore.

It's not tested, it's indeed just a hint.

NOTE: Array should be reversed in place!

Is that tested in javascript? Or is it just a suggestion/hint to avoid the timeout?

That returns a new array tho. It doesn't reverse it in place.

If you failed one, then your code is wrong and it didn't pass all the random tests.

Without more info there's nothing we can do.

My code runs successsfuly in my code editor my it ain't working here even the output is the in same order