Processing to P5 ?

translation.js

function setup() {
   createCanvas(500, 500);
   smooth();
}

function draw() {
  background(255);
  noStroke();
  fill(0);
  ellipseMode(CENTER);

  translate(width/2, height/2);
  
  randomSeed(99);  // Immer die gleiche Zufallsfolge
  
  var numberOfDots = 4000;
  var radius = 180;

  for (var j = 0; j < numberOfDots; j++) {

    var randomangle = random(0, TWO_PI);   // Zufaelliger Winkel von 0 - 360 Grad
    
    var randomradius = radius * sqrt(random(0, 1));   // Homogene Verteilung

    var x = -sin(randomangle) * randomradius; 
    var y = cos(randomangle) * randomradius; 

    ellipse(x, y, 5, 5);
  }
}
    

This should work. See the image.

BTW it's good to add a link to the original work. Like --> https://www.openprocessing.org/sketch/62168 Random Distribution In Circle – Homogeneous by FELD