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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.
No edge case tests with undefined
No random tests
User is allowed to modify input, while description requests to return a new object.
No edge case tests
No random tests
Initial code doesn't compile.
Trivial map/filter/reduce is not a novel kata idea.