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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.
This is great for training your code skills, finding the solution to a simple problem without using the native functions that Javascript provide us. Of course is not the best way to solve the problem because you are using too much time and resources, but is amazing for training purpose.