woooow)

yes i did that ^^

Thank you very much for your reply ;)

It's a bitwise OR operator which in this case (against 0) essentially cuts of all non integers. Here it's used as a somewhat crude and hacky way to avoid Math.floor() or parseInt().

My advise would be to be careful using it in your projects. The | 0 is easily overlooked and can leave your future you searching forever where your math doesn't add up. Math.floor() does a better job at being self-explanatory. Since the example above is very short, the | 0 doesn't hurt for the simple purpose it serves.

Also look at stanleyvarga's comment. He also makes a solid point not to use it everywhere.

What means this "|" in Javascript ?

_ is often used as a variable that's unused (Other than in Lodash), it's just a variable name that doesn't really have a name.

Hiii...
What is the use of _ in (_,i)? Please explain.

This doesn't work with n = 0 but the tests aren't testing it.

With arguments [1,2,3,4,5] and 0, this returns [NaN: NaN], so I'm a bit confused how this passed.

const out = new Array(n).fill(0); //is more sleek

using modulus at the index: i%n is a good idea!

Cheating, it doesn't work for any m >= 200. :-/

Hey!

I can assure you that I have no intentions of offending anyone. The comment is just a play on a very well known quote from the movie Titanic as well as an internet meme.

please change that 'code me like a French girl' comment – it's offensive