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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.
The statement doesn't say what to do for this case.
No need to 'use undefined'. It works perfectly if in the arrayShiftToEnd for loop the end condition is modified to i < array.length - 1
:)
No problem since you have exactly my solution.