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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.
Clever - Maybe because your solution was the obvious one and this has fewer lines of code and leverages already available methods?
Best practice? Eh, maybe not, if I were using large data sets this obviously isnt ideal, but for small values of n like this challenge, it doesn't make a lick of difference.
If I wanted something more efficient I would have used a different approach, but it's a kata, not a time sensitive app.