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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.
When expecting non-null (
!null forgiving) you can useFirst()instead ofFirstOrDefault(). That expects at least one element in the enumeration, and won't return a null-default-type. (Consequential difference: If it were null with!it would throw aNullReferenceException, withFirst()it would throw aInvalidOperationException.)