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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.
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Everyone knows this is wrong, right?
I'd like to live in your world. What if there are hundreds of rows? Extra columns?
True, but I think the exercise was to deal with the data as given. Consider if it came from a database.
Fails for squares(2,0), should return empty array.
You just taught me Infinity.