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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.
index - 1 is what'd I'd go for in production. I used it here, because I wanted to move on to the next problem and didn't want to spend time adding -1 to every value.
That's the reason I didn't vote his as best practice.