background(0);

  resetMatrix();

  translate(width / 2, height);

  noFill();

  stroke(random(45), random(150, 255), random(35));

​

  for (let i = 0; i < sentence.length; i++) {

    let current = sentence.charAt(i);

    if (current == "F") {

      line(0, 0, 0, -len);

      translate(0, -len);

    } else if (current == "+") {

      rotate(angle);

    } else if (current == "-") {

      rotate(-angle);

    } else if (current == "[") {

      push();

    } else if (current == "]") {

      pop();

    }

  }

}