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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.
Description is awful, the logic for the failing examples doesn't follow the maths for actually calculating a triangle, gave up...
Struggled to understand the question, I think this needs clarification otherwise I feel a lot of people (myself included) will pass on this one.
Yeah I think I messed something up copy/pasting from my editor... My bad, apologies!
It was in JavaScript
The starting function name is makeNumberNegative(), however the test requires makeNumber() ...