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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.
That is a good way to solve it if you are doing the same excercise in JS or any other language. But you should try using contains, and the best part is that it si going to return true or false