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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.
Don't just tell us. Enforce it. Otherwise, people will anyway. ( So their solutions will be shorter, less prone to bugs, more readable and more maintainable than yours .. )
This is basically https://www.codewars.com/kata/sum-all-the-arrays without the "ignore non-number" part. So it's a duplicate.
Needs random tests.