createCanvas(400, 400);

  let foo = 7;

}

​

let x = 0;

let direction = 3;

​

function draw() {

  background(240);

  ellipse(x, height / 2, 20);

​

  x = x + direction;

​

  if (x > width || x < 0) { // || means logical OR

    direction = -direction;

    let y = 9;

  }

  print(y);

}

​