Some final words on our EmuDevz JavaScript emulator, which is finally finished, and then on to the next challenge...writing an NES emulator in Haskell!
If you want to skip the introductory remarks about the JavaScript code and get straight to the Haskell, skip to around 3:45.
Thumbnail painting: "Napoleon Crossing the Alps", by Jaques Louis-David (1801).
New video: "A Wave of Monads"
https://www.youtube.com/watch?v=8GwEGKfbqFg
Thumbnail print: "The Great Wave of Kanagawa", by Hokusai (1831).
In problem set 13b we get more practice with monads. I try to consciously explore my mistakes deeply so people can follow along as I get lost and then find my way.
Monads (or as I like to call them, sequenceables) aren't magic! In Set 13a of the MOOC at haskell.mooc.fi, we get more practice with them.
The title image is by John William Waterhouse, "The Sorceress" (1911)