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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.
My code was incomplete, it passed the attempt after checking that negative numbers can be sorted too. Check your code
I'm having the same issue with JS but for me it's a little different:
expected [ Array(14) ] to deeply equal [ Array(14) ]