Source: https://studio.code.org/projects/gamelab/HiQ8tNg7zpeAeM8N_DF9oSTR3dFdVdd-fx_ETjk6dMU
I made it a bit better... if you want to update it that is

textFont("monospace");
noStroke();
fill("limegreen");
textAlign(CENTER, CENTER);
textSize(25);
//World.frameRate = 15;

var t = "gamelab.freeflarum.com";
function draw() {
  background("black");
  text(ran(), 200, 200);
}
function ran() {
  var _t = t.substring(0, Math.floor(World.frameCount/5));
  for (var i = Math.floor(World.frameCount/5); i < t.length; i++) {
    _t += String.fromCharCode(randomNumber(33,126))
  }
  return _t;
}```

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