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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 is easy to read if you understand it.
Not correct. Lets imagine that you go north 5 and then west -5, then your "begin" will be 0, but you will be not at your starting point. Here direction has 2 vectors, not 1.
Just one line of code with excelent performance.