createCanvas(400, 400);

  textAlign(CENTER);

  frameRate(5);

}

​

function draw() {

  background(255);

  // random() gives us a number between 0 and 1

  let diceroll = random();

  let color1 = 'black';

  let color2 = 'black';

  let color3 = 'black';

  let color4 = 'black';

  // we can divide [0,1] to different "bins"

  // let's have 4 equal size bins

  if (diceroll < 0.25) {

    color1 = 'white';

  } else if (diceroll < 0.5) {

    color2 = 'white';

  } else if (diceroll < 0.75) {

    color3 = 'white';

  } else if (diceroll < 1) {

    color4 = 'white';

  }

​

  textSize(200);

  scale(1, 3);

  fill(color1);

  text('A', 50, 150);

  fill(color2);

  text('A', 150, 150);

  fill(color3);

  text('A', 250, 150);

  fill(color4);

  text('A', 350, 150);

}