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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.
Very well commented.
The instructions say return false if any argument is not a number but the tests require an argument of NaN to return NaN instead.
There is no clear instruction for how to treat an argument of 0. There are instructions for no arguments and for negative integer arguments and a reference to adding positive integers but nothing explicit for 0.
The fourth submit test case expects double line numbers "1:1: x" etc instead of "1: x" etc. This seems to be an error