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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.
This was my answer except I got an error for not having the ? after n, and I couldn't figure out how to fix it. Thank you!
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if Concat already concats the array, then how is there an array for Join to concat?
is it because GroupBy creates another array/IEnumerable?
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Yeah for c# the top-voted solution doesn't appear to add MyPoints to the average. I'm new so I'm not sure if there is a mistake here or if I'm missing something.