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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.
To me this one looks really nice and clean.
It probably means that your solution doesn't work with integer string values as described in the problem description. Your solution returns [1.0, 2.0, 3.0] for parameter array ["1", "2", "3"] whereas it should return [1, 2, 3]. The test set seems to be a bit lacking as they are not testing this case.
Don't understand question :(
What about integers?