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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 true. Per StackOverflow,
(map head . group . sort)is a stand-in fornubwhich is less direct but might compute things faster.Edit: I read a bit farther on the page I linked. This does impose a restriction that the list elements are
Ord.first time encountering "nub" thanks for the lesson.