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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.
Yes, it creates. But it drops input array setting copy of it to the numbers param. It possibly could also be considered as input array changing.
Did you mean to comment on a different solution? This one creates a copy.
Perhaps creating a copy of the array inside the function would have been better, correct?