createCanvas(400, 400);

  background("#FAF9F6");

​

  let turtleString = "B";

​

  for (let i = 0; i < 10; i++) {

    turtleString = turtleString.replaceAll("B", "F+[B+]-B[-B]FF");

  }

  print(turtleString);

  strokeWeight(2);

  translate(width / 2, height / 1.1);

  renderString(turtleString);

}

let branchLength = 8;

let angle = Math.PI / 9;

​

function renderString(string) {

  for (let character of string) {

    if (character == "F") {

      rotate(random(angle, -angle));

      strokeWeight(branchLength / 12);

      line(0, 0, 0, -branchLength);

      translate(0, -branchLength);

    } else if (character == "+") {

      rotate(angle);

    } else if (character == "-") {

      rotate(-angle);

    } else if (character == "[") {

      branchLength /= 2;

      push();

    } else if (character == "]") {

      branchLength *= 2;

      pop();

    }

  }

}

​