this is smart... amazing

Nice!

It's clever for sure. But usually clever != best practice.

-12 + (-18) = -30; the target is '6 - (-12) = 18' or '6 - (-18) = 24';

There is quite good solution, but it isn't consider values such as:

• for s = 6
• v1 = -12
• v2 = -18

So, 6 can be found by (-12 - -18) for example...

Practice. Don't listen to negative responses.

wow!

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 ?

pure gold as is

no bro :(

Your problem comes from the concept of proximity. The description says that we sould return the pair with the lowest last element's index. It means that in [10, 5, 2, 3, 7, 5] the answer is [3,7]. In [10, 5, 2, 3, 5, 7] the answer is [5,5] because the last 5 has an index lower than 7.

If you see what I have been trying to do in 3 days, you will advice me to quit.