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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.
Several languages (JavaScript, Python, COBOL, probably others) test explicitly the original list has not been mutated and the tests fail if it has. So no. It's part of the requirements of the kata, it is explicitly stated in the description, and it teaches good practices.