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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.
Not an issue.
I'd guess JavaScript. The tests aren't broken though; make sure you're not modifying the original input with something like
splice,shiftorpop.Check out this kata to get a better understanding of why.
(TLDR: The tests are working on the same array you are. If you modify it, the tests receive a different input than you did)
the random tests are broken.