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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.
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I think this Kata needs a bit more explanation on the instructions, or to be 7th kyu... As a JavaScripter with little OOP experience it took me a long while to get it, and I'm still not super sure why it works the way it works... The lack of description about what is going on with the tests is quite frustrating. BUT this is an awesome topic that I wish I knew more about and Im glad I got this kata.