2bam

JavaScript array extension methods, rough benchmarks for QuickJS and Node V8

Results / TL;DR:

• In QuickJS dst.push.apply(dst, ext) is faster by a 200% margin over others.
• In V8 concat is better for few extensions specially for big arrays, otherwise push wins for more than a few extensions of small sized arrays. Somewhat depends of GC frequency.

2bam

//
// Dungeons and diagrams like puzzle generator
// 2bam.com 2024
//
// There's room for improvement (in C):
// - Fit board into int64 masks
// - Use "&" + popcount intrinsics to count walls

const STOP_ON_FIRST_FOUND = false;
const PRINT_EACH_BOARD = true;

2bam

/*
This is a great question!

For me the breakthrough was not to focus on the Model or the View but the line
in between them: Queues.  

The most important part of abstractions is the communication.

By enqueuing you don't infer the animation from a state diff, you rather encode
the diff patch into an event message (aka Command pattern) which commits a game

2bam

#
# gnuplot script to show energy and cpu by time from batlog.sh
#
# To run:
# gnuplot -persist batlog.gnuplot
#

set datafile separator ","
set xdata time
my_fmt = "%a %b %d %H:%M:%S %Y"

2bam

// 
// Thx https://www.measurethat.net/Benchmarks/Show/3549/0/javascript-sorting-algorithms
//
// 1000x random ordered: https://www.measurethat.net/Benchmarks/Show/3549/0/javascript-sorting-algorithms
// 1000x almost ordered: https://www.measurethat.net/Benchmarks/Show/25092/0/javascript-sorting-algorithms-best-case-almost-ordered
//

  function swap(ary, a, b) {
      var t = ary[a];
      ary[a] = ary[b];

2bam

    VideoCapture cap("libcamerasrc ! video/x-raw,width=640,height=480 ! appsink", CAP_GSTREAMER);

2bam

void SetupGitAuthentication()
{
    // Set the path so git's ssh executables are called instead of Windows'
    Environment.SetEnvironmentVariable("PATH", "C:\\Program Files\\Git\\usr\\bin;" + Environment.GetEnvironmentVariable("PATH"));

    // This duplicates what "start-ssh-agent.cmd" does to find the agent PID and socket file,
    // in order to set SSH_AGENT_PID, SSH_AUTH_SOCK so git works.
    // We heuristically take the first we find, as the script does. This seems to work, as
    // possibly the PID is not even necessary.
    var tmpPath = Path.GetTempPath();

2bam

If you:

• are using PowerShell or CMD directly
• don't want to be forced to use id_rsa
• don't want to input a passphrase on each call to git
• don't want to use Git Bash because you want to use it from CMD/PowerShell directly you need some troubleshooting to use git installation executables and a prior setup:

1. Start or get currently running agent into env vars (PID and socket/pipe file)

start-ssh-agent.cmd

2bam

internal class CInteropProxy {
    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
    unsafe delegate int C_stepDelegate(World.Pinned* world);

    C_stepDelegate? c_step; // Set with kernel32.dll GetProcAddress()

    public void Step(in World world)
    {
        unsafe
        {