let xspeed=[1,2,3,4];

​

for (let xs = 0; xs <10, xs++){

}

​

// Declare a variable for the horizontal speed of the ball

let xspeed1 = 1;

let yspeed1 = 1.2;

let xspeed2= 2

let yspeed2=2

function setup() {

  createCanvas(400, 400);

  // Initialize the position in the center

  x1 = width / 2;

  y1 = height/2;

  x2 = width / 2;

  y2 = height/2

}

​

function draw() {

  background(220);

​

  // Move the ball ball, either right or left

  x1 += xspeed1;

  y1 += yspeed1;

  x2 += xspeed2;

  y2 += yspeed2;

  // Simplified Version:

  // When the ball is at either left or right border

  if (x1 <= 0 || x1 >= width) {

    // Flip the sign of the direction

    xspeed1 *= -1;

  }

  if (y1 <= 0 || y1 >= height) {

    // Flip the sign of the direction

    yspeed1 *= -1;

  }

  if (x2 <= 0 || x2 >= width) {

    // Flip the sign of the direction

    xspeed1 *= -1;

  }

  if (y2 <= 0 || y2 >= height) {

    // Flip the sign of the direction

    yspeed2 *= -1;

  }

  // Draw the ball

  ellipse(x1, y1, 50, 50);

  ellipse(x2, y2, 50, 50);

}

​