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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.
don't mutate the input array
Then for JS this is not a problem, and for other languages there are issues open below. Closing.
did you read the initial code though ?
In JS is an object, why would it be any of the other things you mention?
replaceAll requires Node v15, it's not supported in CW at this time, use another thing.