Implement OpenSet as a Priority Queue

[meiamsome]

In order to achieve the best performance, a priority queue should be used for OpenSet. ( O(1) lookup for finding the minimum and O(log(n)) for removing it)

As javascript has no built in priority queues, it would have to be implemented or externally included

(I would like to see Dan program and explain that!)

[shiffman]

This is a great suggestion for a follow-up video potentially.