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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.
before solving question give a good amount of time on understanding how the code works you will get better hope it helps
also checck for null and for length < or == 0
deeply equal means it should not change the original array or in tech terms not a shallow copy
start with very basic
can you provide the code