mandelbrot Node.js program

/* The Computer Language Benchmarks Game
   https://salsa.debian.org/benchmarksgame-team/benchmarksgame/

   Greg Buchholz's simple C #2 program transliterated by Isaac Gouy. 
   
   stdout NOT BUFFERED   
*/





var bit = 0;
const byte = new Uint8Array(1);
const iter = 50, limit = 2.0;
var zr, zi, cr, ci, tr, ti;

const h = +process.argv[2] || 200, w = h;

process.stdout.write(`P4\n${w} ${h}\n`);

for (let y = 0; y < h; ++y) {
  for (let x = 0; x < w; ++x) {
    zr = zi = tr = ti = 0;
    cr = 2 * x / w - 1.5;
    ci = 2 * y / h - 1;
    for (let i = 0; i < iter && (tr + ti <= limit * limit); ++i) {
      zi = 2 * zr * zi + ci;
      zr = tr - ti + cr;
      tr = zr * zr;
      ti = zi * zi;
    }

    byte[0] <<= 1;
    if (tr + ti <= limit * limit) byte[0] |= 0x01;
    ++bit;

    if (bit === 8) {
      process.stdout.write(byte); 
      byte[0] = 0;
      bit = 0;
    } else if (x === w - 1) {
      byte[0] <<= 8 - w % 8;      
      process.stdout.write(byte); 
      byte[0] = 0;
      bit = 0;
    }
  }
}

    

NOTES:
64-bit Ubuntu quad core
v23.0.0


 Tue, 22 Oct 2024 23:34:53 GMT

MAKE:
cp -L mandelbrot.node mandelbrot.js

0.15s to complete and log all make actions

COMMAND LINE:
 /opt/src/node-v23.0.0/bin/node mandelbrot.js 16000

(BINARY) PROGRAM OUTPUT NOT SHOWN