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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.
That shouldn't make a difference? Array.Length is a property with O(1) constant lookup time.
Better practice would be to declare an int equal to x.Length before the for loop and compare it to that, so x.Size only gets called once
What if x.length == 0 ?