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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.
when you remove, what happens to this.left.right node of the removed node?
Ah yes, this is a great iterative Dynamic Programming example. This would also suffice for my part two kata looking for a DP approach. http://www.codewars.com/kata/58d82486ba7462035000005f/train/javascript
nice! I will soon have a part two up that requires storing state