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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.
Eval seems very slow:
http://jsperf.com/codewars-custom-kata-5296455e4fe0cdf2e000059f
That kind of is the point
this method is so sketchy