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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.
In JS, an array is more-or-less an object with numbers as keys. So this answer is doubly redundant.
I don't think so. This is a fundamentals 8 kyu kata and it can help to be more generous to the newcomers. At least the author did not spoil the whole answer.