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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.
Yes, it is, and it is probably the best way to do things like this. I could've added a constraint to the generic parameter (
A extends ReadonlyArray<unknown>) but chose not to because it would've made the recursive solution a lot more annoying. Do you have any test cases you want me to add?