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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.
the direction was to write the factorial function not to import the existing one
Indeed. Check ternary operator for more examples
Elegant return statement
embedded tests looks buggy. it passes all tests on local machine