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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.
sumis not an array, but a function. Because it's called twice on each comparison during sorting, you may end up with some numbers having their sum calculated multiple times.Why? As I understand it, the sums for each number are only calculated once. During the compare the sum array is only referenced.