​

function setup() {

  createCanvas(400, 400);

  background(220);

​

  walker= new Walker();

}

​

function draw() {

  walker.step();

  walker.render();

}

​

class Walker {

  construction (){

    this.x = width/2;

    this.y = height/2;

  }

  render(){

    stroke(0);

    point(this.x,this.y);

  }

  step() {

​

    let choice = floor(random(4));

    if (choice == 0) {

      this.x++;

    } else if (choice == 1) {

      this.x--;

    } else if (choice == 2) {

      this.y++;

    } else {

      this.y--;

    }

​

  //to avoid our walker moving out of our canvas

​

  this.x = constrain(this.x, 0, width - 1);

  this.y = constrain(this.y, 0, height - 1);

​

  }

}