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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 is a minor task i think, so way he solved it is the best instead of split toString and etc etc etc. I im not really sure that his solution can be useful in commercial development, but in this case - good solution, very clever!