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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 the author did a very good job with readability. The solution is over-engineering at its finest, but it also highlights the spirit of world-building. The code is telling a story of the "snail" and his mission to explore the world of "array" as it collapses behind him into a pit of fire.
Can anyone explain this?