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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.
I gave it a suggested ranking of 6, but the person who approved it ranked it a 7 :/ Nothing I can do about it, unfortunately.
Fixed the tests code so you mutating the input doesn't matter anymore. Your code isn't right if you use the same values for 2 coordinates, you could go 5 blocks north and 5 east and your code returns true.
It seems you're mutating the input there.