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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.
@JohanWiltink - This was only added to the kata description in response to NekoDanuki's comment
Yes you are correct. If n is smaller than 0, then array[n] would return undefined and Math.pow(undefined, n) will return NaN. However, none of the test cases include negative values of n, so this will not occur.
I kept coming back to this Kata over and over again, but each time I couldn't solve it... I eventually Googled 'popular dice games' and immediately found the rules of the game. After that, it wasn't difficult to code a solution. It was very satisfying to finally solve this one!