The more I learn, the more I'm convinced that there's nothing that can't be learned.

Joseph Grosso posted a very thorough (and glowing!) review of my book, "The Ray Tracer Challenge": https://t.co/NN0U5GB0aZ -- includes tips for troubleshooting and optimizing your renderer!

Sentinel Comics RPG is an amazing system. I made a random character generator for it: https://t.co/0O6BJapkla (repo: https://t.co/PJviHe7f9r).

BASIC was developed in 1964. 31 years later, in 1995, Java came out. Here we are now, 30 years since Java's release, and it occurs to me that Java is now the BASIC of any language being developed today. 🤯

17 years?!?!

Playing with maze generation in Swift & SwiftUI, with the great book "Mazes for Programmers" by @jamis!

Generating mazes with the help of @jamis book "Mazes for Programmers". I am trying to re-create an oldie that I used to play in the 90s: Alcazar the Forgotten Fortress on the #MSX. I am doing it on the the #playdate

Just finished converting an ancient cvs repo of mine to git, finally. Thread on BlueSky:

Today, my wife and I are celebrating 10,000 days since we were married! We’ve ordered a few Lego(-ish) sets with a combined total of at least 10k pieces to celebrate. Feel free to do likewise :)

I’m very excited to be speaking at RubyConf next month, with Adviti Mishra. We’ll be talking about how we used fibers in a non-concurrent context to fix a stack overflow error caused by recursion. Come say hi!

At @MongoDB, they wanted to add a tighter integration between #Rails and #Mongoid (their ODM), so they created their our own CLI tool that extends the Rails CLI, adding the additional functionality they sought. Join former Rails core alumnus and Capistrano-creator @jamis at

The forums for my ray tracer book are back up, after a hiatus of some months. #embarrassing --

Rubygems' security page hints at discussions occurring on a mailing list, on IRC, and on a wiki, but in all three cases the discussions are more than a decade old. Are there any more recent (ideally, *current*) discussions around Rubygems security (and specifically gem signing)?

I'm excited to be in Toronto in September, for Rails World! I'll be speaking about some of the work I've been doing at MongoDB, extending the Rails CLI to work with our Ruby ODM, Mongoid, and showing how you can do the same. See you there!

My daughter asked https://t.co/yqPhPderPk to "imagine tony stark on a tiny stork" 😂

I think we're all glad David was not swayed by my enthusiasm :) and even though I cringe at what I thought was a great idea at the time, it is fun to remember what a wild time that was to be involved with Rails.

I also wrote https://t.co/XaWunx7yLZ about the same time, which eventually culminated in https://t.co/L3vWO1Ix7S (just a month before I was hired by 37signals).

I was kind of high on the possibilities of this DI framework, and David asked me to write something up describing how Rails might benefit from DI. The first draft was

This was about 4 months before I was hired by 37signals. I was fresh from meeting @dhh at the 2004 RubyConf, where I'd given a presentation about (cringe) a Dependency Injection framework for Ruby, called Copland. After the conference I wrote a "better" one, called Needle.

Going through some old files on my server, I stumbled upon this bit of history:

Remember when programming used to be fun? You were starting to program, making code do things, draw things, and solve puzzles. Playing with ideas, just thinking, it's the best medicine for programmer’s block, burn-out, and the grayest of days. @jamis https://t.co/QN7JjHJZ1F