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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.
Yes, you are correct. But why the heck does it do that?
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Definitely the fewest lines of code, but getting all the permutations will slow dramatically as the number grows
Your range could be 1..15 instead of 1..16 (highest possible value of delta is 15 - 0)