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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.
There are no JavaScript example test cases written for this, and in the "attempt" test cases I am not being shown what's being tested. I had to write my own tests to make sure my preliminary attempts worked before checking the final result, which was a good exercise in writing tests, but I'm not sure that's what the purpose of this site is for.