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Understanding contravariance
The concept of contravariance, contravariant functors, and the Contravariant typeclass defined in the ‘contravariance’ Haskell library.
Top posts
Every blog post that took off on Hacker News, ranked by the votes of its best submission. 4,419 posts.
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Scaling Your Static Site to a Global Market for a Fraction of the Cost on AWS
Migrating from a server-based solution to S3 static website resulted in increased performance and decreased costs
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Datomic: Look at all the things I'm not doing
A post by August Lilleaas, published April 20, 2018.
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Life as a GitHub Intern: What laser cutting taught me about contribution graphs
This post follows the story of a GitHub intern's experience laser cutting a contribution graph to creating an application that automates the process.
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Understanding Image Sharpness (2003)
The sharpness of a photographic imaging system or of a component of the system (lens, film, image sensor, scanner, enlarging lens, etc.) is characterized by a parameter called Modulation Transfer Function (MTF) , also known as spatial frequency response. We present a unique visual explanation of MTF and how it relates…
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The Strangest Book on the Theory of Computation (2009)
Based on the description of the book in the World Scientific Press catalogue, I asked my university library to order a book entitled Automat...
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Measuring the many sizes of a Git repository
Is your Git repository bursting at the seams? git-sizer is a new open source tool that can tell you when your repo is getting too big. git-sizer computes various Git…
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More fun with reactive-banana-automation
My house knows when people are using the wifi, and keeps the inverter on so that the satellite internet is powered up, unless the battery is too low. When nobody is using the wifi, the inverter turns off, except when it's needed to power the fridge.
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Consistency Models
Jepsen analyzes the safety properties of distributed systems–most notably, identifying violations of consistency models. But what are consistency models? What phenomena do they allow? What kind of consistency does a given program really need?
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The Costs of Programming Language Fragmentation
Robert O'Callahan. Christian. Kiwi. Software guy. All content human-authored unless otherwise noted.
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Electron 3.0.0
The Electron team is excited to announce that the first stable release of Electron 3 is now
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Some thoughts on security after ten years of Qmail 1.0
Some thoughts on security after ten years of qmail 1.0 Bernstein, 2007 I find security much more important than speed. We need invulnerable software systems, and we need them today, even if they ar…
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Master password in Firefox or Thunderbird? Do not bother
There is a weakness common to any software letting you protect a piece of data with a password: how does that password translate into an encryption key? If that conversion is a fast one, then you better don’t expect the encryption to hold. Somebody who gets hold of that encrypted data will try to guess the password…
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Dependent Haskell
Are dependent types the future of software development? Read more about our work on Dependent Haskell in this blog post.
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The cost of games
Yesterday I was in Anaheim giving a talk called “Industry Lifecycles.” (click here for slides and video).
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Swift: When Unused Code Is a Bug
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Yubico sent marketing email to address submitted for product replacement
You're probably reading this page because you've attempted to access some part of my blog (Wandering Thoughts) or CSpace , the wiki thing it's part of. Unfortunately you're using a browser version that my anti-crawler precautions consider suspicious, most often because it's too old (most often this applies to versions…
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How Old Are Successful Tech Entrepreneurs?
A definitive new study dispels the myth of the Silicon Valley wunderkind.
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Re-affirming Long-Term Support for Java in Amazon Linux
In light of Oracle’s recent announcement indicating an end to free long-term support for OpenJDK after January 2019, we re-affirm that the OpenJDK 8 and OpenJDK 11 Java runtimes in Amazon Linux 2 will continue to receive free long-term support from Amazon until at least June 30, 2023. We are collaborating and…
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An 8-tube module from a 1954 IBM 705 mainframe: it's a key debouncer
IBM's vacuum tube computers of the 1950s were built from pluggable modules, each holding eight tubes and the associated components. I recent...
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FoundationDB community highlights, two weeks in
In two weeks since open sourcing FoundationDB , we’ve had an outpouring of interest.
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