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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.
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In JS, an array is more-or-less an object with numbers as keys. So this answer is doubly redundant.
I don't think so. This is a fundamentals 8 kyu kata and it can help to be more generous to the newcomers. At least the author did not spoil the whole answer.
I would suggest removing the hint in the description
Maybe. But you still need to create whole data of days
So I think it just one of the way to do this
it would not shorten the answer or make it run faster i think
Would an array be more appropriate compared to using an object with numbers as it's key?
Wouldn't for .. of be functionally identical (And slightly easier to read)?