let y;

​

function setup() {

  createCanvas(400, 400);

x=width/2;

  y=height/2;

}

​

function draw() {

  background(220);

  rectMode(CENTER);

  square(x,y,frameCount);

  if (frameCount>100) {

    frameCount=-100}

}

function keyPressed() {

  if (keyCode === LEFT_ARROW ) {

    x-=10;

  }else if (keyCode === RIGHT_ARROW ){

      x+=10; }

}