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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.
I passed the tests with JavaScript using code that will return 5 for this array..arr = [5, "5"]. Should return undefined. Need better tests. Needs to be fixed. Refactored my solution.