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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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JavaScript Solution:
I think in second solution test for cubic polynomial answer is wrong. I cheked my solution with Riemann Calculator Online (https://calculator-online.net/riemann-sum-calculator/) and answer is -4.291875000000000 (how i expected) against -4.441875 of author's test.