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Modern SQL: With – Organize Complex Queries
The WITH clause adds named subqueries to SQL queries. WITH is also known as Common Table Expression (CTE).
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The latest blog posts to take off on Hacker News. 14,544 posts.
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Breaking the fourth wall with Minecraft
Update 23/11/2015 - I’ve got many requests about the WiFi bulbs. You can find them on dx.com. Enjoy! Recently I started playing Minecraft, again. I find vanilla Minecraft somewhat boring, so I always look out for modpacks. After searching for new modpacks, I stumpled upon FTB Horizons: Daybreaker. Looking at the…
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Using strace to figure out how Git push over SSH works
Yesterday I was curious about how git push works over SSH. I’m getting more used to using strace to figure this kind of thing out, so I gave it a shot. If I strace pushing to this site’s repository, this shows up:
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Covariance and Contravariance
Subtypes and supertypes are a common part of modern programming. Covariance and contravariance tell us where subtypes are accepted and where supertypes are accepted in place of the original type. This shows up frequently in most of the programming most of us do, but many developers are unaware of the concepts beyond a…
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Python's Hidden Regular Expression Gems
Some hidden features of the Python re module and the support machinery that drives it.
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Oh, Go Ahead, Overthink FizzBuzz (2008)
I gave the best programming interview answer I may have ever given last Friday. The interviewer hauled out FizzBuzz and asked me to solve it. It took me a minute to stop laughing. FizzBuzz is a brain-dead simple programming problem, used pretty much to tell if a developer has a pulse at all. It is…
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Python C API, PyPy and the road into the future
tl;dr; We are willing to commercially support CPython C API in PyPy, so if you want pypy to support library X, get in touch with me at fij...
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Anyone Can Learn to Code an LSTM-RNN (Part 1: RNN)
A machine learning craftsmanship blog.
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We need less powerful languages
We need languages and systems that are less powerful, not more powerful, and easy ways to create and use such languages.
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Breaking all the Eggs in C++
If you want to make an omelet, so the saying goes, you have to break a few eggs. Think of the omelet you could make if you broke not just a...
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Five years of Scala and counting: debunking some myths
I started using Scala 5 years ago instead of Java after starting (but never quite finishing) to read the first edition of Programming in Scala. First only present in tests, my first attempts at Scala code would quite soon invade small utility classes and before I knew it take over all of my projects. There are many…
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Teensy weensy crypto
As the UK's politicians continue to fail to understand what "strong cryptography" or "banning" even mean, I thought I would have a look at how simple strong cryptography can be.
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What MongoDB got right
MongoDB is perhaps the most-widely-mocked piece of software out there right now. While some of the mockery is out-of-date or rooted in misunderstandings, much of it is well-deserved, and it’s difficult to disagree that much of MongoDB’s engineering is incredibly simplistic, inefficient, and immature compared to…
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Finite state machines as data structure for representing ordered sets and maps
It turns out that finite state machines are useful for things other than expressing computation. Finite state machines can also be used to compactly represent ordered sets or maps of strings that can be searched very quickly.
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Bare Metal Rust 2: Retarget your compiler so interrupts are not evil
Random code snippets, projects and musings about software from Eric Kidd, a developer and occasional entrepreneur.
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Playing Fasttracker2 .XM files in JavaScript
Hit the play button above and it will play music; specifically, music composed with (or at least, compatible with) a program released in 1994 called FastTracker 2; this is a Javascript homage I wrote in a fit of nostalgia. The source code is on GitHub if you'd like to check it out.
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Counting Things in Python: A History
Sometimes the Pythonic way to solve a problem changes over time. As Python has evolved, so has the Pythonic way to count list items. Let’s look at...
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Divisibility by 7 is a Walk on a Graph (2009)
Mathematics, applications of mathematics to life in general, and my life as a mathematician.
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The category design pattern
A programming design pattern inspired by category theory
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Quasi-Polynomial Algorithm for Graph Isomorphism
Update (Dec. 14): The long wait is over! Here’s Laci’s paper on the arXiv. So far, I’ve read it only deeply enough to note that it contains the following sentence: A group G ≤ S…
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Browser Engines 2015: Commit Rates and Active Developer Counts
I used to work as a developer in the “core” group at Opera that developed thePresto web engine. During this period, I often wondered just how many developers...