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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.
In my opinion it's a great way to learn the Ruby Core API as I'm new to Ruby.
For the first some katas I coded in Java style, but after I saw some really good and compact solutions I started to read more carefully the Ruby doc :)