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Code colocation is king
A simple principle to help structure code better
Topics /
Software Engineering
The most popular blog posts about software engineering on Hacker News. 14,540 posts.
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Provide agents with automated feedback
Back pressure for agents You might notice a pattern in the most successful applications of agents over the last year. Projects that are able to setup structure around the agent itself, to provide it with automated feedback on quality and correctness, have been able to push them to work on longer horizon tasks. This…
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Having, a less understood SQL clause
Understanding how the group by and having clauses work can help us write more efficient SQL. I want to demonstrate this with an example…
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The Story Of Mel
This was posted to Usenet by its author, Ed Nather ( < nather@astro.as.utexas.edu > ), on May 21, 1983.
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Let's talk about joins
An review of horizontal and vertical joins with examples from education research.
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I rewrote a Clojure tool in Rust
About two years ago, I wrote a quite complicated diff tool in Clojure. It was complicated enough that I struggled to fit the algorithm in my head and the inputs were large enough that I had to make some efforts to improve performance.
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What's in the Box?
Here’s a sentence I find myself saying several times a week: …or we could just box it. There’s two remarkable things about this sentence. The first, is that the advice is very rarely heeded, and in...
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A railroad simulation using discrete event simulation
In our previous post, we introduced how to utilize Discrete Event Simulation (DES) in PicoLisp. Now, let's explore another application: a railroad model…
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Building bots to mend badges, or how to get your GitHub account suspended
TL;DR: Many badges were broken since they were using the shuttered pypip.in site. I wrote a bot that could fix these and automatically submit pull requests with the changes. And then I had my GitHub account suspended. Do not make automatic unsolicited pull requests. Disclaimer This post discusses the design...
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Emacs’s Builtin Elisp Cheat Sheet
Emacs now has a builtin cheat sheet for a large swathe of common elisp functions. If you can't remember exactly how to do something, then this is a great place to look for it first.
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Two Objects Not Namespaced by the Linux Kernel (2017)
Covers two Linux primitives that are not namespaced by the current set of Linux kernel namespaces.
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The pull request hack is fucking magic
I don't have time to keep up with all the daft Open Source projects I release. I wish my skill and my energy was as wide as my ambition. Several years ago, I came across Felix Geisendörfer's Pull Request Hack. The premise is simple - if people are making decent Pull Requests to your project then you should give them…
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Hiding messages in x86 binaries using semantic duals
This is a quick writeup of a steganographic tool that I threw together: steg86 . It uses a quirk of the x86 instruction encoding format to hide messages in pre-existing binaries with no size or performance overhead.
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On the Cleverness of Compilers
The “Sufficiently Clever Compiler” has become something of a trope in the Lisp community: the mythical beast that promises language and interface designers near-unlimited freedom, and leaves their output in a performance lurch by its non-appearance. A few years ago, I was young enough to join a research project to…
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The State of Vacuum in Postgres
In a recent blog post , I talked about why every system that implements MVCC needs some scheme for removing old row versions, and how VACUUM...
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Machine Learning in JavaScript
I love machine learning algorithms. I've taught classes and seminars and given talks on ML. The subject is fascinating to me, but like all skills fascination simply isn't enough. To get good at something, you need to practice! I also happen to be a PHP and JavaScript developer.
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Intuiting Pratt Parsing
You already know that a + b * c + d is calculated as a + (b * c) + d. But how do you encode that knowledge precisely enough for a machine to act on it?
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How to Print Integers Really Fast
Paul Khuong's personal blog. Some Lisp, some optimisation, mathematical or computer.
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Chinchilla’s death
“With more careful calculations, one can win; with less, one cannot” — Sun Tzu, The Art of War .
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Linux Raw Sockets
Recently I did a userspace implementation of the Host Identity Protokoll (HIPv2, RFC 7401) with the upcoming Diet Exchange (HIP DEX, IETF draft 6) . Doing so, I've learnt a lot about raw socktet programing under Linux and here I want to share a few things with you.
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Creating a bash completion script
Lazarus Lazaridis’ personal blog with posts mostly related to programming and opensource. And cats.
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Code Review from the Command Line
I do the bulk of my code reviews from the command line, especially when reviewing larger changes. I've built up a number of tools and config settings that help me dig into the nuances of the code I'm reviewing, so that I can understand it better than if I were just browsing online.
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Reminder: "Broken gets fixed, but shitty lasts forever"
A while back, it came to my attention that ruby's net/https implementation had an insecure default: not verifying TLS certificates (OpenSSL::SSL::VERIFY_NONE). I wrote an article about it for RubyInside, and helped @geemus fix the issue in his excon gem. Despite this being an incredibly serious security issue, nobody…