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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.
this is very readable though
The best solution that I've seen so far
This comment is hidden because it contains spoiler information about the solution
I think this is a maximal complexity when it is still readable.
One more loop or expression would make this less readable, but now it is perfect.
Oneliner is not automatically the "best practice", readability is more important