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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.
If n was type of number, spread operator would not work with it (would throw error). Spread operators only work with arrays and string.
BTW, your solution was clever and simple