let ball;

function setup() {

  createCanvas(400, 400);

  ball = new Ball(cost);

  train(2);

}

​

function draw() {

  background(220);

  ball.show();

}

​

function cost(x, y) {

  return dist(x, y, 400, 400);

}

async function train(learnRate) {

  while (!cost <= 2) {

    ball.learn(learnRate);

  }

}

​