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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.
Switch Expression and Pattern Matching
I think this kind of problem became more readable when C# got switch expression and pattern matching.
Ref.
Switch Expression
Pattern Matching
@Kartoffelsalat Could you explain what is happening here?