y,

    spacing,

    count;

​

function setup() {

  x = 0;

  y = 0;

  spacing = 10;

  count = 0;

  createCanvas(400, 400);

  background(22);

}

​

function draw() {

  stroke(233);

  for (let i = 0; i < 10; i++) {

    const direction = random() > cos(count) + 1.5;

    line(x, y + ((direction) ? spacing : 0), x + spacing, y + ((direction) ? 0 : spacing));

    x += spacing;

    if (x > width) {

      x = 0;

      y += spacing;

    }

    if (y > height) {

      noLoop();

    }

  }

  count++;

}