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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.
For JavaScript version...when the input array is null, returning an empty array ( [] ) does not satisfy the tests. Instead, I am told "wrong return value." Am I misunderstanding something, or is there an issue with the kata?
The instructions DO state that. They say to return false if the number is not a positive integer.