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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 had the same problem like yours...no clue
:)
OK, I've just solved it in R. 63 feels appropriate. There are even multiple solutions: with JavaScript-like golfing techniques or with an R-specific feature.
You may be right; I didn't write the R solution myself (I don't know R); the person who did had just learned it and spent an hour or so Googling around for tricks to code golf in R.
Were you able to get it in JS?