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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.
or extract "pure" factorial method, which can be made recursive
The site hasn't been working for about the last 4 hours. Its not just you.
JavaScript does not have this problem.
C# apparently does.
There is a difference between an empty and an array with 1 element of 0. The description and unit tests do not tie up.
checking a number each time to throw an exception is wasted overhead just use a loop.