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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.
Test cases should probably use assertEquals instead expect, as they don't fail when incorrect value is returned.
That was a nice kata. Thanks!
Although you probably should block Number.parserInt() as well. I've managed to finish it, second time around, just using that function.
HTH.