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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.
Only because of the exponent = 3
Otherwise, you could do a arr.length-1 and it would easily work for EVERY instance you could throw at it up to memory limits.