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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.
Details mention "or undefined in Javascript." but this kata only available in Ruby. Please update details text.
whats the " :+ " do? in other words, what does the second paramter take??? never seen nothing like this inject