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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.
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Node v than 8.x should be enabled
Desperately missing tests with numbers that aren't integers.
Duplicate of http://www.codewars.com/kata/sum-of-all-arguments-1
This statement
If 1 number is provided as an argument that number must be returned
is redundant.It adds nothing to the Kata requirement, which already says
It has to return the sum of all numbers passed as arguments (however many are provided)