Html/js is good for some UI parts of an app but eventually makes one yearn for native threading/locking, queueing, posting notifications, for that last 10-20% of code.
Its fine. Downloaded the pdf. Its straightforward. Good examples. The topic of graphs is so interesting. Its more fun, as you read, to think about how this can describe real world networks like facebook friends, traffic patterns on a gmap, internet routers, world trade patterns.