[bgrins]

Hey Matthew, great job on this! I had fun learning this algorithm, too. My implementation is here: https://github.com/bgrins/javascript-astar/blob/master/astar..., and I have a demo here: http://briangrinstead.com/files/astar/

I have added in a few optimizations: in my first run at it (https://github.com/bgrins/javascript-astar/blob/master/astar...) I used a standard array for the open and closed lists, and I found it slowed down quite a bit as the graph size got larger. I switched the implementation to a binary heap, which made it much faster for larger graphs. Try the original demo then the new one at 100x100 to see what I mean :)