Here's a tribute to the tutorial as such, independent of the topic: After having consumed thousands of tutorials, I found this one exceptionally lucid and inst

Here's a tribute to the tutorial as such, independent of the topic: After having consumed thousands of tutorials, I found this one exceptionally lucid and instructive. Kudos to the author! His approach of stepwise expansion and refinement lets him introduce feature after feature without the whole thing looking stilted or shopping-list cluttered. For each feature, he shares an itch with the reader and then scratches it. This keeps the reader interested and motivated. Here, at least in my opinion, is a style and an approach that other tutorials would do well to emulate.