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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.
For me this is very familiar with Linq in C#. I like this style and I think it is way better then writing two returns. Using lambda is so easy and clear to read, in my opinion.