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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.
Nope, totally readable to me; this is pretty much (I think) the standard way to populate a 2D array with specific values.
If you're using JS then you shouldn't be expecting to read for loops and C-like constructs all the time; that's why you're writing in JS and not C, right? (Just like in Ruby you abuse all the aliases because they're here :D)
When I'm writing code that has to be maintained, I don't golf. I mean, seriously, even I can barely read this, and it wasn't that long ago.
I'd probably use something boring, like
forloops. Lame.