let bubbles = [];

​

function setup() {

  createCanvas(200,200);

  createP("value");

  slider = createSlider(1, 20, 1);

​

  slider.input(valuechanged);

  valuechanged();

}

​

function valuechanged() {

  if (slider.value() < bubbles.length) {

    bubbles.length = slider.value();

  } else if (slider.value() > bubbles.length) {

    while (bubbles.length < slider.value()) {

      bubbles.push(random());

    }

  }

​

  console.log(slider.value() + "," + bubbles.length);

}

​

function draw() {

  background(0,255,0);

  text(slider.value() + "," + bubbles.length,0,width/2);

}