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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.
I have similar situation with javascript. My own test cases all pass, but I get
pageIndex returned incorrect valueerror during final submission. I wish there were more details to help me understand whether my code is actually broken or there is an issue in test cases..