Jim Fisher
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Vidrio
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Developer of Vidrio, the future of presentation. Other topics include C, UNIX, and networking. Also find me on GitHub, Stack Overflow, LinkedIn, Twitter, Instagram, Keybase. Find my old blogs: Wordpress (2010-12), Medium (2013-15).

Summary of ‘Zero to One’, Chapter 7: Follow the money (2018-09-23)
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Summary of ‘Zero to One’, Chapter 6: You are not a lottery ticket (2018-09-19)
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Summary of ‘Zero to One’, Chapter 5: Last mover advantage (2018-09-17)
Summary of ‘Zero to One’, Chapter 4: The ideology of competition (2018-09-16)
Summary of ‘Zero to One’, Chapter 3: All happy companies are different (2018-09-15)
Summary of ‘Zero to One’, Chapter 2: party like it’s 1999 (2018-09-14)
Don’t say ‘simply’, at Write the Docs 2018, Prague (2018-09-13)
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How is the Redis sorted set implemented? (2018-04-22)
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The dots do matter: how to scam a Gmail user (2018-04-07)
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A summary of Managing Oneself by Peter Drucker (2018-04-01)
What are /dev/stdout and /dev/stdin? What are they useful for? (2018-03-31)
Rounding up to the next power of two in C (2018-03-30)
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What is HTTP keep-alive? What is HTTP request pipelining? (2018-03-27)
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How to create an SSH certificate authority (2018-03-16)
A lambda calculus interpreter in Haskell (2018-03-15)
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Hello world in Linux x86-64 assembly (2018-03-10)
Writing a parser in Haskell (2018-03-09)
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An interpreter in Haskell (2018-03-06)
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Creating a UDP connection with netcat (2018-03-04)
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How does network address translation work? (2018-03-02)
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What does Linux do with a lost TCP connection? (2018-02-27)
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Sun
What are TCP sequence numbers? (2018-02-24)
Running tcpdump on a TCP connection (2018-02-23)
How does swapping stdin and stderr work? (2018-02-22)
Wed
Hello world in C inline assembly (2018-02-20)
How to make a system call in C (2018-02-19)
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Diary writing prompts (2018-02-17)
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Wed
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What is the routing table in Linux? (2018-02-12)
How does an IP address get translated to a MAC address? (2018-02-11)
What is a subnet? (2018-02-10)
How does reverse DNS lookup work? (2018-02-09)
Run-length encoding in C (2018-02-08)
How does ping work? (2018-02-07)
What is DHCP? (2018-02-06)
Don’t use nscd (2018-02-05)
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What does getaddrinfo do? (2018-02-03)
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What is tcpdump? (2018-02-01)
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Don’t say “simply”, at Write The Docs London (2018-01-23)
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A hex compiler in C (2018-01-21)
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Bootstrapping a C compiler (2018-01-11)
What is a random oracle? (2018-01-10)
How to hash multiple values (2018-01-09) Diary: 185 words
Diary: 304 words
Diary: 940 words
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Diary: 675 words
Diary: 531 words
Making a stream cipher (2018-01-01)
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osquery: UNIX as a SQL database (2017-12-11)
What is open addressing? (2017-12-10)
What is a TTY? (2017-12-09)
What is modular arithmetic? (2017-12-08)
Inline quizzes (2017-12-07)
Linking to external posts from Jekyll (2017-12-06)
Nativité 2017: creating a Facebook Messenger bot (2017-12-05)
How less works: the terminal’s alternative buffer (2017-12-04)
An encrypted diary using OpenSSL (2017-12-03)
The sorry state of OpenSSL usability (2017-12-02)
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What is ASN.1? (2017-11-30)
UNIX free: used does not mean what you think it means (2017-11-29)
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Diff views in GitHub-Flavored Markdown (2017-11-27)
Nativité, a pastoral Christmas game (2017-11-26)
DNS resolution procedure (2017-11-25)
Adding blog tags (2017-11-24)
Diff views as instructions (2017-11-23)
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What is Swift’s @NSApplicationMain annotation? (2017-11-13)
Moving pictures (2017-11-12)
SaaS price models: cost-based pricing vs. value-based pricing (2017-11-11)
Adding a blog header (2017-11-10)
How PHP and Composer find your code (2017-11-09)
I hate telephones (2017-11-08)
A JavaScript Promises implementation (2017-11-07)
How do I release a PHP Composer package? (2017-11-06)
What are promises in JavaScript? (2017-11-05)
Adding Open Graph meta tags to jameshfisher.com (2017-11-04)
Asymmetric encryption with the Web Cryptography API (2017-11-03)
Symmetric encryption with the Web Cryptography API (2017-11-02)
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Signing a string with HMAC using the Web Crypto API (2017-10-31)
Hashing a string with the Web Cryptography API (2017-10-30)
Guest writers (2017-10-29)
Guest post by Luís Fonseca: WebGL shading: both diffuse and specular (2017-10-28)
Forward secrecy with hash ratchets (2017-10-27)
The Three Ts of Time, Thought and Typing: measuring cost on the web (2017-10-26)
Group chat with end-to-end encryption (2017-10-25)
Web Push API in Firefox (2017-10-24)
Giant Game of Life (2017-10-23)
Game of Life implemented with a fragment shader (2017-10-22)
Drawing a cube in WebGL (2017-10-21)
Generated normal-mapped ripples (2017-10-20)
GLSL varying variables (2017-10-19)
Generating a normal map in WebGL (2017-10-18)
Multiple textures in WebGL (2017-10-17)
WebGL shaders with color (2017-10-16)
One-dimensional Perlin noise (2017-10-15)
macOS OpenGL hello world using GLFW (2017-10-14)
WebAssembly hello world (2017-10-13)
WebGL shading: diffuse vs. specular (2017-10-12)
WebGL Lambertian shading (2017-10-11)
WebGL matrix visualization (2017-10-10)
WebGL clipspace point visualization (2017-10-09)
WebGL canvas size vs. CSS size vs. viewport vs. clipspace vs. world space (2017-10-08)
Drawing a clock face with WebGL (2017-10-07)
How to load an image in WebGL (2017-10-06)
WebGL fragment shader animation (2017-10-05)
Textures in WebGL shaders (2017-10-04)
WebGL shader uniforms (2017-10-03)
WebGL fragment shader (2017-10-02)
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Drawing a triangle with WebGL (2017-09-30)
Unicode is only for plaintext (2017-09-29)
Where is the Unicode feed icon? (2017-09-28)
WebGL hello world (2017-09-27)
IndexedDB hello world (2017-09-26)
lldb hello world (2017-09-25)
LocalStorage hello world (2017-09-24)
How can I store things on the browser? (2017-09-23)
Adding an RSS feed to a Jekyll blog (2017-09-22)
How can I encrypt data in the Web Push API? (2017-09-21)
Web Notification API onclick (2017-09-20)
What is the web Push API? (2017-09-19) Per-IP rate limiting with iptables external link (2017-09-19)
ICFP: Ode on a Random Urn (2017-09-18)
Hello world in Rust (2017-09-17)
Coping with depression (2017-09-16)
Why are there 21 million bitcoins? (2017-09-15)
What is a Web App Manifest? (2017-09-14)
What is the web Background Sync API? (2017-09-13)
new Notification(...) is deprecated (2017-09-12)
Service worker hello world (2017-09-11)
What are service workers? (2017-09-10)
How could Bitcoin fail? (2017-09-09)
Publication notifications for static sites (2017-09-08)
What is the web Notification API? (2017-09-07)
Array vs. dictionary pagination (2017-09-06)
Worst interview (2017-09-05)
How to write an essay (2017-09-04)
Running a Laravel+Pusher workshop at work (2017-09-03)
What makes a good blog post title? 5 steps to going VIRAL! (2017-09-02)
August review (2017-09-01)
Post-driven permanent blog pages (2017-08-31)
How do I make a full-width iframe with fixed aspect ratio? (2017-08-30)
Securing my Bitcoin (2017-08-29) A calendar view for this blog (2017-08-29)
What is an extern function in C? (2017-08-28)
What is extern in C? (2017-08-27)
What is static linking in C? (2017-08-26)
What system calls does dlopen use? (2017-08-25)
How to make plugins with dlopen (2017-08-24)
Sentence wrap (2017-08-23)
How to inspect Mach-O files (2017-08-22)
What is C include? (2017-08-21)
What is an authoritative DNS server? What is a recursive DNS server? (2017-08-20)
Does C have generics? (2017-08-19)
What is stdatomic in C? (2017-08-18)
What are Open Graph meta tags? (2017-08-17) Marketing works! (2017-08-17) Golang’s realtime garbage collector at GolangUK (2017-08-17)
How do Reddit thumbnails work? (2017-08-16)
Greater-than is redundant (2017-08-15)
Promoting Vidrio (2017-08-14)
How to distribute a MacOS .dmg (2017-08-13)
How to build a .dmg to distribute MacOS apps (2017-08-12)
How do peer-to-peer programs discover each other? (2017-08-11)
How to trace a DNS lookup (2017-08-10)
What is the rel=canonical tag? (2017-08-09)
How to move your GitHub pages blog to Netlify (2017-08-08)
This site is now on jameshfisher.com (2017-08-07)
Instance DNS in multi-tenant services (2017-08-06)
How to let your users sign in with Google, from scratch (2017-08-05)
How to write a DNS server in Go (2017-08-04)
How can I do DNS lookup in Go? (2017-08-03)
How to implement malloc/free (2017-08-02)
How to watch system calls with dtruss (2017-08-01)
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How to cut out the CA middleman (2017-07-30)
Are concurrent fwrites atomic? No! (2017-07-29)
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Notes from Minsk (2017-07-25)
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Golang’s realtime garbage collector at GoWayFest, Minsk (2017-07-21)
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The Fisher Tree at The Realtime Guild (2017-07-05)
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Pattern jokes via WordNet/NLTK (2017-06-25)
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Long calendar (2017-06-06)
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Defining the sine function as an oscillator (2017-06-04)
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Granddad died today (2017-05-19)
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Don’t trust cat! (2017-05-07)
What is the clear program? (2017-05-06)
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What is CIColorKernel? (2017-05-03)
How to make a Core Image kernel program running on the CLI (2017-05-02)
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How to pass multiple inputs to a CIKernel (2017-04-30)
How to write a webcam app in Swift on macOS (2017-04-29)
What are samples in a Core Image kernel? (2017-04-28)
How to make a custom CIFilter in Swift (2017-04-27)
How to apply a CIFilter to an image in Swift (2017-04-26)
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How to write ‘hello world’ in TensorFlow (2017-04-23)
What is the simplest neural network? One neuron (2017-04-22)
What is a .app? (2017-04-21)
How to run Swift from the CLI (2017-04-20)
How to write an OpenCL ‘hello world’ on macOS (2017-04-19)
How to write a TCP chat server in 55 lines of Golang (2017-04-18)
What company information is public? What’s on Companies House? (2017-04-17)
What is a business? What is a company? (2017-04-16)
How to create a public-key infrastructure (2017-04-15)
How can I do elliptic curve crypto with OpenSSL? (2017-04-14)
Vidrio gets real product keys (2017-04-13)
Vidrio payment server: creating charges (2017-04-12)
Vidrio payment server (2017-04-11)
Playing with Stripe (2017-04-10)
Product key server as a service (2017-04-09)
How to implement a ‘free trial’ for macOS apps (2017-04-08)
Multiplexing by looping over nonblocking sockets (2017-04-07)
What is go tool trace? (2017-04-06) rxi/vec - a simple C vector library (2017-04-06)
How do I set a socket to be non-blocking? (2017-04-05)
What is the viewport meta tag? How can I display my website on mobile? (2017-04-04)
How to run go tool trace (2017-04-03)
What is ‘sequencing markets’? (2017-04-02)
Monthly review: 2017-03 (2017-04-01)
Vidrio promo video: first cut (2017-03-31)
Replay with sound (2017-03-30)
How to prevent autoplay on mobile (2017-03-29)
Varying navbar for mobile and desktop (2017-03-28)
How to use keycastr (2017-03-27)
Vidrio promo music (2017-03-26)
Study of framer.com promo video (2017-03-25)
Your password is the private key. So what is the public key? (2017-03-24)
How to get your point across with spaced repetition (2017-03-23)
How do I do public-key signatures with openssl? (2017-03-22)
How do I do public-key encryption with openssl? (2017-03-21)
How is MainMenu.xib found in Cocoa? (2017-03-20)
What is NSApplication? How is it instantiated? What is NSApp? (2017-03-19)
What is Swift’s @NSApplicationMain annotation? (2017-03-18)
How to make a Cocoa application without a .xib file (2017-03-17)
Vidrio 1.2 is released (2017-03-16)
Vidrio marketing strategy (2017-03-15)
Don’t say ‘it will take five minutes’ (2017-03-14)
How do I create a message digest using openssl? (2017-03-13)
How do I hash a password with openssl? (2017-03-12)
How do I fetch a server’s SSL certificate using openssl? (2017-03-11)
How do I generate random bytes with openssl? (2017-03-10) Golang’s realtime garbage collector at Not On The High Street Conference (2017-03-10)
How do I encrypt text with openssl? (2017-03-09)
Vidrio is Tony Stark’s presentation tool (2017-03-08)
Vidrio is on Slack (2017-03-07)
Vidrio needs the touch bar (2017-03-06)
Vidrio for Windows (2017-03-05) Vidrio 1.1 is released (2017-03-05)
Vidrio installs per day (2017-03-04) Vidrio bug: pause toggle text wrong after unpausing by setting to default opacity (2017-03-04) Vidrio: better screenshots on the App Store (2017-03-04)
How to add a developer account to XCode (2017-03-03)
Vidrio turns the webcam off when not showing it (2017-03-02) Vidrio should have a pause/unpause feature (2017-03-02) Vidrio opacity slider (2017-03-02) Vidrio is available! (2017-03-02) Vidrio app description (2017-03-02) How to submit an app build to iTunes Connect (2017-03-02)
How do I create the AppIcon for my app? (2017-03-01) Vidrio website (2017-03-01) Vidrio privacy policy (2017-03-01) Vidrio gets a menu bar (2017-03-01) Vidrio App Record (2017-03-01) Redis Pub/Sub under the hood external link (2017-03-01) Justifying posts (2017-03-01) Monthly review: 2017-02 (2017-03-01) Installing and running ebe (2017-03-01) What is the Apple Store release process? (2017-03-01)
How to write a TCP server with the pthread API (2017-02-28)
What are the domain and type arguments to the socket system call? (2017-02-27)
What is UTF-8? (2017-02-26)
How to write a TCP server using the fork syscall (2017-02-25) Should I go paperless? (2017-02-25)
What is mode_t in C? (2017-02-24)
How do I print bits in C? (2017-02-23)
What is ssize_t in C? (2017-02-22) Don’t use the word ‘simply’ (2017-02-22)
What is a a FIFO, or “named pipe”? What is mkfifo in C? (2017-02-21)
How to write an assembly ‘hello world’ on macOS (2017-02-20) What is lsof? (2017-02-20)
How to generate Intel and AT&T assembly with clang (2017-02-19)
What are setjmp and longjmp in C? (2017-02-18)
How do I call a program in C, setting up standard pipes? (2017-02-17)
How do I close a file descriptor in C? (2017-02-16)
Golang’s realtime garbage collector, at The Realtime Guild (2017-02-15) How do I duplicate a file descriptor in C? (2017-02-15)
UNIX as a SQL database (2017-02-14)
French preposition examples (2017-02-13)
What are Lamport timestamps? (2017-02-12)
Are processes and messages different? (2017-02-11)
What is the happened-before relation? (2017-02-10)
How to wake up earlier (2017-02-09)
How can I wake up earlier? (2017-02-08) How does GeoDNS work? (2017-02-08)
How do I call a program from C? (2017-02-07)
How do I use fork in C? (2017-02-06)
How do I use execve in C? (2017-02-05)
FOSDEM: The Challenges and Secrets of the Realtime World (2017-02-04) WebRTC - low barrier to entry, low barrier to exit? (2017-02-04) What are the stages of C compilation? (2017-02-04)
How do I generate assembly from a C file? (2017-02-03)
How do I access environment variables in C? (2017-02-02)
Monthly review: 2017-01 (2017-02-01)
What system calls does macOS have? (2017-01-31)
How do I read man pages? (2017-01-30) Cloning Spaceteam (2017-01-30)
In what ways can processes communicate? (2017-01-29)
How can I write a file with mmap in C? (2017-01-28)
How can I read a file with mmap in C? (2017-01-27)
What is mmap in C? (2017-01-26)
What is Coulomb’s law? (2017-01-25)
Quickly checking for a zero byte in C using bitwise operations (2017-01-24) How to subtract in binary (2017-01-24)
What is the type of a constant in C? (2017-01-23)
What is the difference between C constants and C literals? (2017-01-22)
What are lvalue and rvalue in C? (2017-01-21)
What is the UINT64_C macro in C? (2017-01-20)
What is electric current? (2017-01-19)
What is electric charge? (2017-01-18)
How does reliability work in RTCDataChannel? (2017-01-17)
How to write a ‘hello world’ serverless WebRTC app (2017-01-16)
What is STUN? (2017-01-15)
How do C signals interact with the stack? (2017-01-14)
What is sigaction in C? (2017-01-13)
Doing something n times in C with while and decrement (2017-01-12)
How do I unregister a signal handler in C? (2017-01-11)
What does the C signal function return? (2017-01-10)
What are ‘signals’ in C? (2017-01-09)
How does differential signaling work in USB? (2017-01-08)
How does the USB power wire work? (2017-01-07)
What is the Ivy Lee method? (2017-01-06)
Error URLs (addressable errors) (2017-01-05)
What are ‘bitfields’ in C? (2017-01-04)
What is a union in C? (2017-01-03)
How do I pack bits in C? (An answer using masks) (2017-01-02)
How fast does an IP packet travel? (2017-01-01)
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What do DNS datagrams look like? (2016-12-31)
What are ‘statement expressions’ in GCC? (2016-12-30)
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Pointer to middle of allocation, part 1 (2016-12-28)
How do I put an array in a struct in C? (2016-12-27)
How do I measure program execution time in C? How do I use the times function? (2016-12-26)
How to write an array literal in C (with explicit indexes) (2016-12-25)
What is perror in C? (2016-12-24)
What are ‘protocol numbers’ in IP? (2016-12-23)
How do I print bytes in C? (2016-12-22)
What is htons in C? (2016-12-21)
How to write a ‘hello world’ HTTP server in C (2016-12-20)
What syscalls does a UDP server need? (2016-12-19)
How to write a TCP server with the kqueue API (2016-12-18)
What is fdset in C? (2016-12-17)
How to write a TCP server with the select syscall (2016-12-16)
What is a “file descriptor”, really? (2016-12-15)
What syscalls does a TCP server need? (2016-12-14)
What is errno in C? (2016-12-13)
What are static functions in C? (2016-12-12)
Sun
How can I do modulo with a bitmask in C? (2016-12-10)
What are ‘macro functions’ in C? (2016-12-09)
What is ‘array decaying’ in C? (2016-12-08)
What are automatic variables (dollar variables) in a Makefile? (2016-12-07)
What is a ‘binary-safe’ string? (2016-12-06)
How do I set the C compiler in a Makefile? (2016-12-05)
What is FILE in C? (2016-12-04)
What does the restrict keyword mean in C? (2016-12-03)
What does const mean in C? (2016-12-02)
Does C have booleans? (2016-12-01) What is realloc in C? (2016-12-01)
Where is the C programming language defined? (2016-11-30) Does C allow pointer arithmetic? (2016-11-30) How do I write a multi-line string literal in C? (2016-11-30) Can I put comments in string literals in C? (2016-11-30) What do array subscripts mean in C? (2016-11-30)
How do I find out which preprocessor my C compiler uses? (2016-11-29) What is size_t for? How do I iterate over an object in C? (2016-11-29) What type should I use to count objects in C? (2016-11-29)
What is static in C? (2016-11-28)
What is void in C? (2016-11-27) What does void mean as a function parameter in C? (2016-11-27) What is K&R style function definition in C? (2016-11-27) Bike front derailleur (2016-11-27)
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Don’t use the word ‘it’ (2016-11-25)
A C typedef convention for complex types (2016-11-24) How is the stack laid out in C? (2016-11-24)
How do varargs work in C? (2016-11-23)
Some screenshots of Vidrio (2016-11-22)
How does a stream cipher work? (2016-11-21)
Should I buy Huel or Joylent? (2016-11-20)
What is symmetric cryptography? (2016-11-19)
How do I change the resolution on macOS? (2016-11-18)
What is an .xcworkspace file? (2016-11-17) What is an .xcodeproj file? (2016-11-17) How do I write a UDP server in Go? (2016-11-17) How do I replace target/action with callbacks in Swift? (2016-11-17) Summary of ‘Zero to One’, Chapter 1: the challenge of the future (2016-11-17)
Learning vim (a short adventure) (2016-11-16) How do I serialize JSON in Swift? (2016-11-16) Post every day (2016-11-16) A summary of ‘On-the-Fly Garbage Collection: An Exercise in Cooperation’ (2016-11-16) Should I get a cleaner? (2016-11-16)
128 byte of CSS is enough (2016-11-15)
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How does tricolor garbage collection work? (2016-11-11)
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Forging web security by escaping the browser viewport external link (2016-08-10)
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Low latency, large working set, and GHC’s garbage collector: pick two of three external link (2016-05-12)
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The James Test external link (2015-01-28)
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Understanding the ELF external link (2015-01-26)
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Wikipedia needs an IDE, not a WYSIWYG editor external link (2014-10-25)
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Software developers are not depressed (but everyone else is) external link (2014-10-23)
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Your first-class functions don’t make you functional external link (2014-10-11)
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The price model shapes the product external link (2014-10-06)
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I want problems, not solutions! external link (2014-10-04)
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Nix by example, Part 1: The Nix expression language external link (2014-09-28)
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Orphaned file detection external link (2014-09-19)
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Git log spelunker (A proposal) external link (2014-09-14)
Documentation for free, or, in-wiki issue tracking external link (2014-09-13)
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Designing a hob knob external link (2014-08-25)
A semantic wiki in Prolog external link (2014-08-24)
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Hide your hyper-links, or, dealing with depth-first syndrome external link (2014-08-21)
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Use a repository as your CI database external link (2014-08-19)
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Make = Puppet external link (2014-08-15)
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Documentation black holes external link (2014-08-13)
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Does a branch identify a commit, or does a commit identify a branch? external link (2014-08-10)
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Estimates are not deadlines external link (2014-07-27) Configuration files suck external link (2014-07-27)
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Your syntax highlighter is wrong external link (2014-05-11)
Alan Turing’s “royal pardon” is absurd external link (2014-05-10)
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On the absence of energy and time in the virtual world of applications, or, the misconception of the “distraction-free” mode external link (2014-05-04)
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TODO DAG external link (2013-12-19)
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Where is the Firefox application shortcut? external link (2013-11-19)
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Visualizing world population (2012-10-30)
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A proposal for visual pure functional programming (2012-02-27)