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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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.
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