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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.
No need to be, every solution (unless it's absolute garbage like you YandereDev style developer) is alright tbh
Not much of a best practice; hard to read and understand whole thingy (since there are easier ways), but i'd say it's clever for sure.
kinda clever but it also has super shitty readability. I'd rather stay with some longer yet simpler solutions to this problem.