let ballSpeed = 3; // speed of the ball

let ballDiameter = 30; // diameter of the ball

​

function setup() {

  createCanvas(600, 200); // create the canvas

  ballX = width / 2; // start ball in the center

}

​

function draw() {

  background(220); 

​

  // update the ball's position

  ballX += ballSpeed;

​

  // check for collision with the edges

  if (ballX < 0 || ballX > width - ballDiameter) {

    ballSpeed *= -1; // reverse the direction

  }

​

  // draw the ball

  fill(150, 100, 250); // set ball color

  ellipse(ballX, height / 2, ballDiameter, ballDiameter); // draw the ball

}

​