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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 using a comparator. Given 'a' (8) and 'b' (2), if "a - b" is POSITIVE, then 'a' MUST be LARGER than 'b'. Therefore, we want 'b' to appear first. if "a - b" is negative then 'a' is SMALLER than 'b', so we want 'a' to appear first. The only thing we care about in "a-b" is the sign of the difference, not the result itself. if the result is = 0, then a = b and we do not care which appears first.