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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.
I think their point was that you shouldn't do one-liners like this for redability reasons (also, isn't it better to just use the function directly, in real code, instead of redeclaring it just to... Rename it?)
But from a solution standpoint, this is amazing
How is using the standard library instead of reinventing the wheel not best practice?