svieira + programming   2631

lightweight concurrency in lua -- wingolog
CML (Concurrent ML) - the nicer version of a similar article (linked here) that implements the same thing in Scheme. Presumes call-with-prompt (something like call-with-cc)
Programming  Concurrency  Lua  DeepDive 
9 weeks ago by svieira
Crafting Interpreters
A book on building an interpreter from scratch
Books  Programming  Learning_Resources 
march 2018 by svieira
The Function Colour Myth • Lukasa's Echochamber
A counter-counter-point to Unyielding vs. What Color is Your Function that comes down more on Unyielding's side.
Programming  Async  Concurrency  Opinion  DeepDive  Python 
march 2018 by svieira
Shtetl-Optimized » Blog Archive » Shor, I’ll do it
A layman's introduction to Shor's algorithm and quantam algorithms in general as a period-finding method using the known truth in multiple universes.
Quantum  Algorithms  Programming  Physics 
august 2017 by svieira
Broadband-Hamnet
Specs for a wireless mesh network using Ham Radio frequencies and COTS hardware and software
Programming  Network  Radio  DIY 
may 2017 by svieira
How to limit WebRTC bandwidth by modifying the SDP - webrtcHacks
If you're doing voice or video chat via Peer-to-Peer, this will help keep the bandwidth requirements low by throttling the total bandwidth requested by a video or audio channel.
Programming  Web_Development  Javascript 
may 2017 by svieira
A fast alternative to the modulo reduction – Daniel Lemire's blog
A neat trick to turn X % Y (x mod y) which is 6 instructions + 26 instructions of latency on 2016 Intel machines into (x * N) >> 32 + assembly to make it not need the shift (4 instructions, no latency).
Programming  Performance  C  Assembly  Algorithms 
may 2017 by svieira
The Wrong Abstraction — Sandi Metz
I've been thinking about the consequences of the "wrong abstraction." My RailsConf 2014 "all the little things" talk included a section where I asserted:

> duplication is far cheaper than the wrong abstraction

And in the summary, I went on to advise:

> prefer duplication over the wrong abstraction

This small section of a much bigger talk invoked a surprisingly strong reaction. A few folks suggested that I had lost my mind, but many more expressed sentiments along the lines of:

> This, a million times this! "@BonzoESC: "Duplication is far cheaper than the wrong abstraction" @sandimetz @rbonales pic.twitter.com/3qMI0waqWb"
— 41 shades of blue (@pims) March 7, 2014

The strength of the reaction made me realize just how widespread and intractable the "wrong abstraction" problem is. I started asking questions and came to see the following pattern:

Programmer A sees duplication.
Programmer A extracts duplication and gives it a name.

This creates a new abstraction. It could be a new method, or perhaps even a new class.

Programmer A replaces the duplication with the new abstraction.
Ah, the code is perfect. Programmer A trots happily away.
Time passes.
A new requirement appears for which the current abstraction is almost perfect.
Programmer B gets tasked to implement this requirement.
Programmer B feels honor-bound to retain the existing abstraction, but since isn't exactly the same for every case, they alter the code to take a parameter, and then add logic to conditionally do the right thing based on the value of that parameter.

What was once a universal abstraction now behaves differently for different cases.
Another new requirement arrives.
Programmer X.
Another additional parameter.
Another new conditional.
Loop until code becomes incomprehensible.
You appear in the story about here, and your life takes a dramatic turn for the worse.
Programming  BestPractices  Development 
april 2017 by svieira
Responsive CSS Patterns without Media Queries
Fab 4 (min-width, max-width, width + calc) and flex-grow: 9999 for responsive container-size-based CSS without any media queries at all.
Programming  Web_Development  CSS 
march 2017 by svieira
The Internals of PostgreSQL : Chapter 1 Database Cluster, Databases, and Tables
What really happens on disk when you create a table, an index, or a tablespace - also, how do you mount one table on a separate partition for speed?
Programming  Books  Postgres  Databases_and_Data_Persistence  DeepDive 
january 2017 by svieira
Buildroot - Making Embedded Linux Easy
A base build system for building embedded systems - great for use with Docker (seem Minimal Containers on YouTube).
Programming  Docker  Linux 
january 2017 by svieira
Joe Duffy - Blogging about Midori
An extremely deep dive on language design by an ex-Microsoft employee who worked on Midorii - a type-safe, async everything language that compiled from C# and was used to write a completely concurrent OS.
Programming  DeepDive  Language  Design  BestPractices  Async  Concurrency 
january 2017 by svieira
CSS Triggers
Things that trigger repaints, reflows, compositing, etc. on first load and on subsequent updates too.
Programming  Web_Development  CSS  Performance 
january 2017 by svieira
The Line of Death – text/plain
Browser chrome, picture-in-picture attacks, and why trusted content (about the security of a feature or requesting permission to activate something) must appear outside of the content-provider's space (line-of-death).
Programming  Security  UserExperience 
january 2017 by svieira
How to Get Fired Using Switch Statements & Statement Expressions
Switch in C is crazy and can be treated more like labels and gotos, allowing oddities like:

if (i < 10) {
case 7:
case 8:;
}

inside a switch statement. Much craziness results.
Programming  C  DeepDive 
october 2016 by svieira
Using Saga To Accumulate And Deduplicate Redux Actions
Why redux-saga is an awesome pattern to combine with redux - deduplication and aggregation of network requests with sagas.
Programming  Web_Development  ReactJS  Javascript  Redux 
october 2016 by svieira
Java Method Reference Evaluation | Kynosarges Weblog
Did you know that `handle` in `Runnable handle = obj::methodReference;` updates when you change what `obj` references?
Programming  JVM  Java 
october 2016 by svieira
The Aux Pattern
Understanding Shapeless and Cats Aux class for type-level computations.
Programming  Scala  TypeSystems 
october 2016 by svieira
Failed Experiments: The missing diamond of Scala variance
Type constructors and variance (covariance and contravariance) patterns found in higher kinded types (HKT)
Programming  Scala  JVM  Theory  TypeSystems 
september 2016 by svieira
The math of CSS locks
How CSS locks work from first principles + not locking the user into a fixed size by setting the root `font-size` to a percentage or to a `rem` unit.
Programming  Web_Development  CSS  Accessibility 
september 2016 by svieira
-- Axioms of Web architecture
Tim Berners-Lee on the principle of least power - "The reason for [picking the least powerful solution] is that the less powerful the language, the more you can do with the data stored in that language."
Programming  Web_Development  BestPractices 
september 2016 by svieira
Electronic Paper Displays — Visionect Server 2.4 documentation
E-Ink - how does it work, and where can you get them (as of 2016)
Programming  Hardware  DIY 
august 2016 by svieira
Concurrency Freaks: Throughput vs Latency and Lock-Free vs Wait-Free
The inverse of the mean of the latency distribution is the throughput
Programming  Algorithms  Performance 
august 2016 by svieira
Capability Myths Demolished
Capabilities vs. permissions for an authorization system
Programming  Security  Theory 
july 2016 by svieira
Is Parallel Programming Hard, And, If So, What Can You Do About It?
A free book on low-level parallel programming with a nice Appendix (C) that details how the CPU cache works.
Programming  Performance  Books  Learning_Resources  Hardware 
july 2016 by svieira
Adactio: Articles—<A>
A brief history of hypertext as it relates to the A tag and the world wide web
Programming  Web_Development  History 
july 2016 by svieira
The Languages Which Almost Became CSS - Eager Blog
A brief history of all of the languages that we *could* have wound up using to style our web pages (with comments from one of those language's designer's!)
Programming  Web_Development  CSS  History 
june 2016 by svieira
What the Hell is Symbolic Computation? / Steve Losh
Understanding symbols and the REPL in LISP (binding functions to symbols like `if` and why LISP can be metacircular).
Programming  LISP  DeepDive 
june 2016 by svieira
How to test for try/catch support - JavaScript / Ajax / DHTML
Those of us that have been writing cross-browser code that exhibits
planned behaviour in the face of any execution environment without ever
showing javascript errors to the user, and without the option of using
try-catch, have learnt that code that is appropriately defensive is not
really that difficult to write and that javascript is very good at
examining its environment for the conditions and features it intends to
employ.

The web application that I am working on at present is only expected to
work with recent IE versions and Mozilla/gecko browsers so try-catch is
not an issue. Yet in what is now more than 10,000 lines of client-side
code there are not more than half a dozen try-catch blocks, wrapping
less than 30 lines of code. All of the many other potentially error
producing conditions are handled by suitable design and defensive code
that tests up front, rather than erroring and then trying to recover.
Programming  Javascript  History 
june 2016 by svieira
Timestamps and Time Zones in PostgreSQL · Philipe Fatio
In reality, there are multiple timezone functions, one that takes timestamp and one that takes timestamptz2. I like to think of them as follows:

When passing a time zone x and a value t of type timestamptz, i.e., timezone(x, t), I’m basically saying, give me the time the clock was showing in time zone x at the absolute point in time t.

When passing a time zone x and a value t of type timestamp, I’m saying, give me the absolute time for when clocks in time zone x were showing t.

Thanks to the two distinct timestamp types, one denoting absolute and the other wall time, we don’t have to specify from which to which time zone we want to convert
Programming  Databases_and_Data_Persistence  Postgres  Time 
june 2016 by svieira
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