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Things to check out

May 27, 2008 under links

A roundup of the latest links from del.icio.us/pdubroy:


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One fine day at meshU

May 20, 2008 under design, programming

I just got back from meshU, a one-day conference focused on design and development for the web. I went on a bit of a whim; the student tickets were only 30 bucks, and there were lots of interesting speakers. Well, it was a good decision — the three talks I saw were well worth the price.

(As an aside, I see that I’ve been added to Patrick Mueller’s Planet OTI aggregator. OTIers, read on! Today’s post contains at least two OTI connections.)

Avi Bryant: Turning the Tables: Moving Beyond Relational Storage

The first talk I attended was by Avi Bryant of Dabble DB fame. Avi talked about why how not to use a RDBMS. There’s been a lot of interest lately in alternatives to the relational database — CouchDB, Amazon SimpleDB, and Google BigTable being the most famous examples.

Avi mentioned that there are two main cases where it’s advantageous to have something other than a relational database. First, if your dataset is massive, as with Google. In this case, it’s just not feasible to use a RDMS. The second case is if your dataset is really just many small, independent datasets, in which case it might be simpler and more scalable to use an alternative technique.

At the end of the talk, Avi demoed MagLev, which is a Ruby interpreter built on top of a Smalltalk VM (OTI connection #1). This was really cool, not just because it’s Ruby running on top of Smalltalk. It was cool because MagLev can transparently persist heap objects to disk, and distribute them to other VMs, either locally or running on other machines. For example, you can define a function in one VM, and then call it from another VM. Wow. As far as I know this was the first time MagLev has been shown in public, but there’s going to be a talk at RailsConf 2008.

Daniel Burka: Iterative Design Strategies

The second talk I attended was by Daniel Burka (OTIers probably know Daniel’s brother Peter). Daniel is the lead designer for Digg and a co-founder of Pownce. Daniel gave a great talk on iterative design strategies. You can check out the slides here.

It was really interesting to hear some of Daniel’s stories from Digg. He said that one of the times that they redesigned the comments, they were getting a lot of negative feedback from users. But they also noticed that under the new system, stories were getting more comments than ever before. So although there was a vocal minority who weren’t happy with the design, it was an overall success. The moral of the story is that you need to look at the implicit feedback as much as the explicit feedback.

Another thing I took away from Daniel’s talk was that I should read How Buildings Learn by Stewart Brand. I’ve had this recommended to me enough times that I’ve finally decided to buy it.

John Resig: Building Interactive Prototypes with jQuery

John Resig is the creator of jQuery, “the write less, do more Javascript library”. This talk was pretty timely for me. I just started using jQuery a few weeks ago for a Firefox extension that I’m writing, and I’m pretty much in love with it. So it was practically guaranteed that I would like this talk, since it was further demonstration of all that is awesome about jQuery. I did learn one new thing from the talk — I’d never heard of the jQuery Form Plugin before, and it is really cool as well.

I’m not sure what more I can say about this one. If you’re a web developer, or a designer who codes a little, you should seriously check jQuery out.


So that was my day. $30 well spent at meshU. Thanks to the organizers: Mark, Mathew, Rob, and Stuart.


Sugar leaves the One Laptop per Child nest

May 16, 2008 under usability, hci, olpc

Sugar Labs logo

It’s been an interesting 24 hours for anyone who follows the One Laptop per Child project. Yesterday, OLPC announced that they have teamed up with Microsoft to make Windows XP available on the XO. Then it was announced that Walter Bender, OLPC’s former president of software and content, is forming a new organization called Sugar Labs to spearhead development of the Sugar user interface.

This is an interesting development. I started working on OLPC-related projects a few months ago, doing some work on the user interface for the built-in graphics tablet. Back in January, I wrote about how cool I think the Sugar UI is. I really hope that Sugar can gain some momentum on its own, instead of constantly being overshadowed by the political and ethical issues of the One Laptop per Child project as a whole.

I’ve been thinking about buying myself some kind of ultra-portable laptop, and since I find it almost impossible to type on the XO keyboard, I’m currently eying the Asus Eee PC. I don’t think it makes sense to use a conventional desktop environment on that kind of machine, and I think that the current Sugar UI is a really promising alternative. Now that Sugar is being developed separately from the OLPC project, it will be interesting to see if it can develop into a useful general-purpose desktop shell.


This is my brain on Twitter

May 7, 2008 under meta

In case you just can’t get enough of me on this blog, I’m pleased to announce the following:

Since all my other plans fell through, I decided to show up to the Twitter party (fashionably late, of course). You can get your Dubroy fix in bite-sized chunks at http://twitter.com/dubroy. Hope to see you there!

And from time to time, I bookmark things that strike my fancy at http://del.icio.us/pdubroy. Most of the links are relevant to this blog, so I try to post a link roundup here every now and then.


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If this is Object Calisthenics, I think I’ll stay on the couch

May 6, 2008 under programming

Via Raganwald, I saw this post by Andrew Birnstock: Perfecting OO’s Small Classes and Short Methods. The post is a summary of an essay by Jeff Bay called Object Calisthenics, from the new Pragmatic Programmers book The ThoughtWorks Anthology.

“Object Calisthenics” is supposedly an exercise to get you to write better object-oriented code. Reading through the suggestions, I couldn’t decide if the article was serious or not. From Andrew’s summary:

  1. Use only one level of indentation per method. If you need more than one level, you need to create a second method and call it from the first. This is one of the most important constraints in the exercise.

  2. Don’t use the ‘else’ keyword. Test for a condition with an if-statement and exit the routine if it’s not met. This prevents if-else chaining; and every routine does just one thing. You’re getting the idea.

  3. Wrap all primitives and strings. This directly addresses “primitive obsession.” If you want to use an integer, you first have to create a class (even an inner class) to identify it’s true role. So zip codes are an object not an integer, for example. This makes for far clearer and more testable code.

From what I can tell, this really is serious. These are supposed to be the object-oriented equivalent of chin-ups, designed to whip you into shape to write better OO code.

This strikes me as so bogus, I can’t even begin to describe it.

I’m not against OO: I’m a huge fan of Smalltalk, and I cut my programming teeth at one of the oldest object-oriented development shops. In fact, I keep thinking of something that Steve Northover used to say to me when I was on my first work term at OTI:

“That which obscures my code is bad.”

If you’ve ever seen a large body of code that adheres to The One True OO StyleTM — like say, Smalltalk class libraries — you’ll understand that almost every step you take towards “true OO” is just another way of obscuring the meaning of your code. If you break your code up into 10 different methods, then that’s 10 different places I have to look to figure out what is going on. You’re just writing spaghetti code by a different name. If you’re building a very large library, then maybe, just maybe, the additional flexibility is worth it.

I think Paul Graham sums it up best in his essay Why Arc Isn’t Especially Object-Oriented:

My own feeling is that object-oriented programming is a useful technique in some cases, but it isn’t something that has to pervade every program you write. You should be able to define new types, but you shouldn’t have to express every program as the definition of new types.