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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.
Yes, maybe there is lack of definition..
I thought the expectation was the very last element, even deeply...
So..
last([123,40],[125,40],[125,39],[123,39]) // would output 39
last('test1','test2') // would output '2'
Passed the tests, but indead, I can't think of a real world application...