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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.
Your code is wrong, not a kata issue, select Node v8 to see which test your code is failing. Read the error message and add some console.log to help you debug it. The reason it didn't fail somewhere else is you didn't test it there with the same input that makes your code fail here.
That's a problem with your code, not a kata issue. See which sample test fails and fix your code.
That test expects true, your code fails the next test:
Not a kata issue.