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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.
Impressive, you solved it in an immutable way quite elegantly
I'm not a Scala programmer. Your solution is interesting.
Not Scala style
You should use vals instead of mutable vars