Bookmarks

• Funny, interesting — https://www.vidarholen.net/contents/wordcount/

Show how many times frustrated Linux kernel developers have put four letter words into the source code.

• http://www.fillmurray.com/ — Fill Murray

An online tool to provide custom-sized placeholder images of Bill Murray! http://fillmurray.com/200/300.

I like the humor and layout of the page. Images are superb.

Check also PlaceCage (Nick Cage Filler Images) and Steven SeGALLERY (Steven Segal Filler Images) :-D

• Evo-Devo (Despacito Biology Parody) | A Capella Science

An amazing video from A Capella Science on biology science. Amazing song. More to see on the YouTube channel.

AI

• Guppies, an evolving neural network.
• The Unreasonable Effectiveness of Deep Learning Representations.

Mathemathics

• http://tylervigen.com/spurious-correlations

Correlation is not causation.

• Tangente n°182, p34-35, "Les excès de la corrélation".

Nous allons vers un changement épistémologique majeur. S'en remettre à ce type de calcul traduit un renoncement aux ambitions de la raison moderne, qui liait les phénomènes à leurs causes. Ces ambitions de la raison permettaient d'envisager la prévention, d'agir sur les causes pour changes les effets. Au lieu de cela, on se dirige vers un système de pures corrélations. [...] On ne cherche plus à comprendre l'environnement, on cherche à le prédire. Notre rapport au savoir change, mais aussi notre rapport au monde: on se focalise davantage qu'auparavant sur les risques. "Voir et comprendre" sont supplantés par détecter et prévenir". On passe d'une civilisation du signe, qui était porteur de sens, à une civilisation du signal, qui est une donnée qui ne signifie rien en soi..

Tools

• oclif, an open source framework for building a command line interface (CLI) in Node.js.
• Krita 4.0 released, Krita is a professional FREE and open source painting program.
• Mosh, a mobile SSH client.
• Live Chat online typing test
• Warp, create self-contained single binary applications.

Books

• Seven Sketches in Compositionality: An Invitation to Applied Category Theory

Dev

• POSE - Declarative motion system for HTML, SVG & React
• Debugging across pipes and sockets with strace

Crystal-clear tutorial on how to use strace, lsof and gdb to debug inter-process issues on Linux.

• Introducing Plotly 3.0.0

open source Python graphing library, with Javascript interaction.

• HyperPolyglot, showing common-used features side-by-side.

Rust

• How to analyze billions of records per second on a single desktop pc

Many interesting comments on RUST, and how to write / debug programs with concurrency/performance in mind.

Methodology

• 5 Red Flags Signaling Your Rebuild Will Fail

5 reasons not to rewrite an existing code.

• Things You Should Never Do, Part I

About the mistake of full rewrite (Netscape 6, Borland Quattro Pro). Instead refactor, rename,

• StranglerApplication

Instead of rewriting, write a strangler application, that will progressively replace the old system.

• Tesler's Law

Tesler's Law, also known as The Law of Conservation of Complexity, states that for any system there is a certain amount of complexity which cannot be reduced.

• Be nice and write stable code

About Semantic Versioning and tips / pits to introduce new functionality, and fixing security bugs.

• Suffering-oriented programming

Don't build technology unless you feel the pain of not having it. Then: First make it possible. Then make it beautiful. Then make it fast. Use cases are everything in suffering-oriented programming.

Learn

• Commentary on the Sixth Edition UNIX Operating System

From Xv6, a simple Unix-like teaching operating system

• An Empirical Study of Experienced Programmers’ Acquisition of New Programming Languages

All participants spent most of their time studying examples, rather than reading the language documentation.

• Principles of Algorithmic Problem Solving, by Johan Sannemo, 2017.

A book on algorithmic problem solving, the art of formulating efficient methods that solve problems of a mathematical nature.

Web

• Idle-until-urgent pattern

Delay non-critical task to idle thread, while forcing their execution if some user event depend on that task being executed first.

Network

• The Illustrated TLS Connection

Every byte of a TLS connection explained and reproduced.

Game

• A Great Old-Timey Game-Programming Hack

Detailed explanation on how to make a fast tile-based game engine. Tricks used:

• Use LEA instruction, most efficient to move bytes, but requiring modifying the stack pointer.
• Pre-process the tiles to cancel effect of fast rendering loop
• Reverse display order to cancel graphical corruption when interrupt occurs and load registers on the stack.

• Super Merryo Trolls

Detailed explanation on 2D game optimization for a Super-Mario-like game. Various tricks are explained about fast scrolling, fast sprite handling...

• Background is generated by a LEA-field, basically a sequence of code generated by the game engine, and when executed, draw pixel to the screen buffer. The LEA-field is organized into sequence of code, each drawing a given scanline.
• Scrolling is obtained by a different offset in the scanline.
• When scrolling, the code in leftmost/rightmost columns of the LEA-field must be updated. This update is done by a code, which is also generated by the engine. This column-update code is generated to avoid duplicate register loading (typ. occurs when the scene has many duplicated pixels, like a blue sky).
• Sprite is also generated by a code, generated from sprite data.

• GTE: The Generic Tile Engine for the IIgs

A very fast tile engine for the Apple IIGS, using advanced techniques to achieve 1 pixels every 1.25 cycles.

CVS

• Merging and patches

Explain how to obtain perfect patch using digle (directed graph file) instead of files, as used in pijul, with some mathematical background.

Science & Tech

• Color: From Hexcodes to Eyeballs — Jamie Wong

The most complete and detailed description on how our eyes perceive colors.

• A circuit simulation and visualisation tool in the browser

Just wow.

Success stories

• Bootstrapping An Online Fabric Shop and Growing to $20K/mo

With good tips about launching new business online.

Miscellaneous

• What is good color

A detailed explanation about color harmony, what makes some painting rich in colors...