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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.
checks for negative numbers
Read this: https://www.codewars.com/kata/515decfd9dcfc23bb6000006/discuss#638a55bb60d8280027719bf8
It's not exactly the same, one of tests has trailing space.
for this case it won't matter if you use == or ===
This often means you're missing a closing bracket