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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.
While true, that would be non-euclidean chocolate, you cannot have a 1 dimension physical object.
Not to be overly pedantic, but (123) is not a valid area code, 0 and 1 are reserved first digits, both in 10 and 7 digit phone numbers.
The example in the description is not similar to what the test cases would be, nor are there any pre-submission test cases.
fizzBuzz[1] would be undefined, fizzBuzz()[x] or fizzBuzz = fizzBuzz(); would work, but that's not made obvious in the example.