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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.
Nice! Mine was similar, but could've been made more simple with += and -= like you have.
I'm not sure what the technique for accessing it is called, but it's just how you access a multidimensional array...or a "nested" array.
This might not be helpful at all, but "nested array" is the term that got Google to help me figure this out the other night on a different kata that had a nested array. shrugs
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I feel silly for using charAt...lol