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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.
You probably already know this, but for others looking at solutions, shifting an array takes O(n) time because it requires updating the index values of every element in the array, where as poping the end of an array takes constant O(1) time. So it is best to pop vs shift whenever possible.
Cheers!