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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.
It's really nice kata but c'mon - whole description is inconsistent (not even mention that tests are failing and boiler code is wrong). You are saying that there should be no literal hello world but putting it into comment also doesn't work. Probably it uses regex magic internally but it would be better to use some JS parser like Esprima or whatever and parse user source code.
Description modified, tanks!
Shouldn't it be somewhere noted that A that is mentioned in description is actually parameter n (at least in JS code it is named n)