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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.
Recursive solutions aren't more "elegant" than iterative solutions. IMO this is misleading. In JavaScript it is very common to write iterative solutions in replacement of recursive solutions, for various reasons such as performance.
Why is it that (-7) is not considered a prime?