text: function setup() {
    createCanvas(640, 360);
    w = new Walker();
  }
  
  function draw() {
    background(51);
    w.update();
    w.display();
  }
  
  function Walker() {
    // pos == the vector
    this.pos = createVector(width/2, height/2);
    this.vel = createVector(0, 0);
  
    
    this.update = function() {
      this.acc = createVector(random(-1, 1), random(-1, 1));
      // velocity
      this.vel = createVector(random(-1, 1), random(-1, 1));
      this.pos = this.pos.add(this.vel);
    }
  
    this.display = function() {
      fill(255)
      ellipse(this.pos.x, this.pos.y, 48, 48);
    }
  }