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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.
OP solved it, closing.
For your question, reassigning an array will modify its original memory address, hence the test checker will detect the original
itemsinstead of the modified one... Though doing so is a bad practice in real-life applications.