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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.
best answer and easy to understnad! anyway i'm curious how is it that if length is given, u just take the array length -1 instead of using the length variable itself? i'm cracking my head wrapping this part :(