typing about typing about types

As we make the push to handle Java 1.5 features in GWT (it's about time!) I'm having flashbacks to undergraduate Compilers. Perhaps this is unsurprising, considering what I'm working on. Part of the difficulty in the problem is that whether you're talking about types in the code that constitutes the compiler itself, types in the code that the user is going to put in, or types in the output code... we use the same word. Oh my. (much worse, I suppose, is the code you get with the Appel book, where half of the words on the screen are helpfully "ty" or "typ". Jebus.)

But! All of this means that by the next GWT release, you'll likely have some code that I touched in your hands. Woo.

python generators and more live coding music!

I just found out about the yield python keyword, which lets you produce generator functions. This came up, in a practical context, because I wanted a clean way to get n items at a time out of a list, and the Python Cookbook approach uses generator functions. They let you build an object that essentially contains a closure of the current environment, which can be iterated on. Sort of like lazy lists! Of course, the same behavior could be done with C-style static variables, but this is really pretty.

- yield keyword from the Python docs
- a discussion of generator functions over at IBM Developerworks.

Also! Brett alerts us to Impromptu, another live coding environment for making music and stuff! From their site:

Impromptu is an OSX programming environment for composers, sound artists, VJ's and graphic artists with an interest in live or interactive programming. Impromptu is a Scheme language environment, a member of the Lisp family of languages.

GWT and ChucK

So maybe two years ago, our good friend (noted security researcher and computing maven in general) Tim J had been kicking around an idea for developing web applications: he wanted to use a more general interface mechanism, say Swing or GTK, for laying things out, with some other layer figuring out how to express what you put together in terms of web languages. At the time, I didn't see the need...

But Google did, apparently! GWT lets you design webapps in terms of Java, running on your local machine for testing purposes. GWT then compiles them down to Javascript when you're ready to deploy for the rest of the world. I'm probably the last to find out. It's open source; you can go play with it if you want. Pretty crazy.

http://code.google.com/webtoolkit/

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Also; after rather a while of hearing my friends work with and develop the music-programming language ChucK, I finally took the time to go play with it. At first I tried to use the Audicle -- which is a really pretty IDE, all done up in OpenGL -- but it crashed on my Mac, so I tried miniAudicle instead. That worked just fine, with a nicely intuitive, minimal interface. After just a few minutes, I was making some interesting bleeping-and-booping noises. It was very satisfying! I think I like the square-wave generator best.

ChucK definitely warrants checking out, if you have any sort of urge to make cool noises, or even cheesy music. Graham Coleman, who wrote said cheesy music tutorial and has in recent months been performing live with ChucK in Atlanta, was just now on the radio, and he proceeded to rock the airwaves pretty hard. Hooray!