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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.
And, of course, I know 0 === -0.
May be it's reason to tests work.
But a visual area has problem and users see -0.
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Sorry, but this code doesn't work if n === -2, for example.
We have -0, but we can't.
We need to write about it. If we have -0 return 0.