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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.
I wrote the same code but for some reason my test kept insisting I always returned 0 xD I even tried just returning elements of the input but it still said 0 every time.
my code looked something similar to this, but I couldn't get "numbers == null" to identify a null array. I had to use: "numbers?.Any() != true"