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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.
The extra test scenarios are not needed, but if they can't ever happen it should be added to the Description.
Why would a limit of the array matter? I am sure it will be ok as long as it fits in a
Int32which is up in the billions.What the array can contain, well objects of course. If you wanna make sure you only check strings you can if each element is of type string before checking the element further.
So yeah I agree that the Kaka's Description could be a lot better, but the Kata itself is fine as it is.
For a good example of a simple but good description I will suggest you look at my Kata Highest and Lowest, never had much in the form of misunderstandings with that.