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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 can help if you write what exactly you do not understand and what you understood from the description )
Js tests work fine, the problem is in your code. Your loop condition is wrong.