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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.
I've changed the tests a bit try now.
My apologies for not having replied yet,could you please clarify how many tests you pass before the error occurs.
Please use three backticks to mark code:
Otherwise it's kind of hard to read your comments. That being said, the JavaScript tests have been changed lately. Did you try again? Also, if you're completely stuck, you can add your current solution as a spoiler in a comment.
It seems to me that your code has both problems in computing the right numbers and giving it the right sign (+/-); for the latter, see my reply below to Neoslide comment.