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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.
And it should not, according to the condition of the task
The minus sign should not confuse you in any way. It has no effect on the algorithm.
Negative numbers do not need special attention, they need to be included in the output string, including their sign. The description includes (at least now) an example. Adding an example in sample tests in all languages would be a good suggestion (some languages don't like JS and CoffeeScript, but most others do), though with the current description this is not an issue anymore. Thanks to Chrono79 for completing the description. No reason to add parentheses.
Added to the kata's description. Parentheses were never mentioned tho.