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How to write a toy JVM
Exploring JVM specification and trying to write a little code to interpret a Java class like a real JVM.
New
The latest blog posts to take off on Hacker News. 1,508 posts.
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Building binary deb packages: a practical guide
How to ship your apps on Debian and derivatives.
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Guide to Python Debugging
<p> Even if you write clear and readable code, even if you cover your code with tests, even if you are very experienced developer, weird bugs will inevitab...
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Overview of Python dependency management tools
I briefly describe each tool (pip, venv, pip-tools, pyenv, conda, pipenv, poetry and Docker), why it’s created and the problems it’s tackling. You can find a table summarizing all the information and the usual setups people use.
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A Nix terminology primer by a newcomer
Maybe I just haven't been paying attention before, but in the last year or so, there seems to have been an increase in discussion around the Nix package manager. This is also what got me to finally try it, and I'm very happy with the results, even if the road is a little bumpy.
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Embedded Rules of Thumb (2018)
26 April 2018 by Phillip Johnston • Last updated 10 June 2021You may call them guidelines, heuristics, or rules of thumb. No matter, the purpose is the same: to provide a reasonable approximation of the truth. These rules of thumb can help guide your understanding of the systems you work on, focus you toward the ……
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A simple way to get more value from tracing
A lot of people seem to think that distributed tracing isn't useful, or at least not without extreme effort that isn't worth it for companies smaller than FB. For example, here are a couple of public conversations that sound like a number of private conversations I've had. Sure, there's value somewhere, but it costs…
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Xfce switches to GitLab
Starting today, May 1, we’re switching from our cgit/gitolite setup to GitLab. Our old server, git.xfce.org, is now a ready-only in-sync mirror (so you can still pull code). Our new server is gitlab.xfce.org.
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Finding secrets by decompiling Python bytecode in public repositories
Cache rules everything around me. `pyc` files can contain secrets and should not be checked in to source control. Use the standard Python [.gitignore](https://github.com/github/gitignore/blob/master/Python.gitignore).
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I wrote a beginners guide to Kubernetes
In this multi-part series of articles I'll try and capture everything I think someone who wants to learn and work with Kubernetes should know about. If you h...
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Hoare’s Rebuttal and Bubble Sort’s Comeback
Editor’s note: For this blog entry I welcome my friend and colleague Gerben Stavengaas a guest author.
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A Visual Guide to React Mental Models: UseState, UseEffect and Lifecycles
I love mental models. They’re crucial to understanding complex systems, allowing us to intuitively grasp and solve complex problems.
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Deno Is a Browser for Code
Explaining the different mental model Deno has about managing dependant code.
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Android Studio 4.0
News and insights on the Android platform, developer tools, and events.
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What's in a Parser Combinator? (2016)
Simplex Sigillum Veri
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Hypermodern Python
A guide to modern Python tooling with a focus on simplicity and minimalism.
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How I made a game played in Notepad
Play games made by Sheepolution
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The use of `class` for things that should be simple free functions
For those who only read above the fold: I don’t say that all object-orientation is bad! OOP, especially classical polymorphic OOP, has a well-deserved place in real code. I’m going to talk about a very specific antipattern that I see with some frequency: the use of class for things that should be simple free functions.
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REPL Driven Design
If you follow me on facebook you know that I’ve been publishing daily CoronaVirus statistics. I generate these statistics using the daily updates in the Johns Hopkins github repository .
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Regexes vs. Combinatorial Parsing (2019)
Recently, I’ve been working on a music app that needs to get a musical sequence (like a melody) from the server to the client. To do this, we use a format called ABC. (You can read about how ABC music notation works here .) We chose ABC because it’s more readable than MIDI, it’s pretty concise, and it’s a standard, so…