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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.
Nice kata. Only comment, and the reason I didn't rate it as ready, is error messages. You test a couple of cases, the messages could be better.
Otherwise, had fun implementing Dijkstra in JS.