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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.
Enjoyed this kata. The difficulty for me was my unfamiliarity with ES6, but at least I knew that was where to look to reach the final solution.
It's part of the edge case testing. Maps shouldn't have to be rectangular in shape.