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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.
It is stated in the kata that array is never empty
Yeah, that = is pointless
"You can assume, for the purpose of this kata, that the supplied array will not be empty"
we have this sentence in description.