createCanvas(100, 100);

  background(220);

  rect(0, 0, 10, 100);

  rect(10, 0, 10, 100);

  rect(20, 0, 10, 100);

  rect(30, 0, 10, 100);

  rect(40, 0, 10, 100);

  rect(50, 0, 10, 100);

  rect(60, 0, 10, 100);

  rect(70, 0, 10, 100);

  rect(80, 0, 10, 100);

  rect(90, 0, 10, 100);

  for(let i = 0; i < 100; i+= 10) {

    rect(i, 0, 10, 100);

  }

}

​

​