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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.
Where you have copied the array with the line, let s = signature you are mutating the original array, which in many cases may not be what you want and can be a source of bugs in your code. You would be better off using something like let s = [...signature]; or let s = Array.from(signature); so anything you now do to s does not affect signature.