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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.
You're right, there's no need to call that a second time. Thank you!
You are calling toLoweCase twice: first time on the whole text, then again in the filter function. What's the point in calling again toLowerCase() in filter function?