​

function setup() {

  createCanvas(700, 400);

  background(0);

  stroke(255);

  noLoop();

}

​

function draw() {

  line(a, 0, a, height);

​

  for (let a = 120; a < 200; a += 2) {

    line(a, 0, a, height);

  }

​

  drawAnotherLine();

​

  drawYetAnotherLine();

}

​

function drawAnotherLine() {

  let a = 320;

  line(a, 0, a, height);

}

​

function drawYetAnotherLine() {

  line(a + 5, 0, a + 5, height);

}

​