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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.
#Taking about JavaScript
It's an extremely bad practice to declare properties/methods on Builtin Objects such as Array.
The author of this Kata should correct this detestable part.