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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.
I'm in agreement with you; I think passing back a partitioned array would be significantly closer to ideal here. Note that you asked if we were interested in "higher order functions" in addition to "functional programming", so maybe it would fit better there.
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