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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.
+1
I feel the same way. The artificial constraints make this an anti-kata, or a lesson how not write Javascript.
Yes clever but for large intervals [1, 1e25] or long arrays of intervals, this is not the best practice. I think best practice should also be efficient.