function setup() {

  createCanvas(windowWidth, windowHeight);

  textFont("Fira Code");

  textSize(16);

}

function draw() {

  background(teal);

  noStroke();

  fill(255);

  circle(mouseX, mouseY, 100);

  fill(0);

  text(`function drawWhiteCircle(x, y) {

    noStroke();

    fill('white');

    circle(x, y, 100);

}

drawWhiteCircle(${mouseX}, ${mouseY});

`, 15, 30);

}