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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 can try console.log if JS or test it in Google Console. Try identify the input before and after your method filter. And you'll do this challenge. Have fun.