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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.
He deleted const in function parameter, so he doesn't have to create a new string.
Second he is passing x by reference '&', so when he doubled x the value in array values changes.