Cool to know these operators do stuff in JS.

really "Best Practices"

yes finally someone who knows about f strings

I just checked the input with print() and the answer is yes. There are so many trash data with other types

A correct solution can be very simple. Maybe you're just making it too difficult.

Ranks are pretty much set in stone on approval, can vary between languages for the same task, and are subjective. Your 4 ranking is a major outlier. 8 people ranked it between 5 and 8, with an average of 6.

Reranking approved kata can only be done by an admin ( not even a mod ). The kata's own discourse is not the place to complain. If you really are serious, raise an Issue on https://github.com/codewars/content-issues, where it will probably be promptly closed without action, unless the approved rank was wildly out of sync with the community average rank ( it was not, here ).

If you read only one thing from the above, let it be this:

The kata's own discourse is not the place to complain.

I agree. Makes no sense to me.

Not 4kyu at all, the description is just awful...

It's alright, but know that this is generally frowned upon. At best, you lose face. At worst, you might get punished.
Yes, my solution was indeed very awesome. Like me. :D

You would be surprised how many people failed to come up with the solution. The fact something is basic for you doesn't mean it's basic for everyone.

It's much more difficult than 6 kyu~

5 or 4!

Thanks! it does help a lot~

think of it as 2 panes by 2 panes

so for example N=1 would be like
-----
|.|.|
|-+-|
|.|.|
-----
and N = 2 would be like
-------
|..|..|
|..|..|
|--+--|
|..|..|
|..|..|
-------

and N= 4 would be
-----------
|....|....|
|....|....|
|....|....|
|....|....|
|----+----|
|....|....|
|....|....|
|....|....|
|....|....|
-----------

The window will always be 2 x 2.

what does this mean? can any help? thanks~

maybe we need more examples, like N = 1 and N = 2... only N = 3, is too hard to guess what to do....