createCanvas(400,400);

  // background('black');

  let turtleString = "F";

  for (let i=0; i < 4; i++) {

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

  }

  print(turtleString);

  // stroke('white');

  strokeWeight(.1);

  translate(width,height/2);

  renderString(turtleString);

}

​

let branchLength = 20;

let angle = Math.PI / 20;

​

​

function renderString(string) {

  for (let character of string) {

    if (character == 'F') {

        strokeWeight(branchLength / 30);

      line(0, 0, 0, -branchLength);

      translate(0, -branchLength);

    } else if (character == '+') {

      rotate(angle);

    } else if (character == '-') {

      rotate(-angle);

    } else if (character == '[') {

      branchLength /= 2.5;

      push();

    } else if (character == ']') {

       branchLength *= 2.5;

      pop();

    }

  // rotate(branchLength*3)

    // translate(1,-10);

  }

​

}