anchor.diff:      var i = this.nodes.length;
   
       while (i-- > 0) {
  -      if(this.nodes[i] != null){
  +      if (this.nodes[i] != null) {
           this.nodes[i].clear();
  -        this.nodes[i]=null;
  +        this.nodes[i] = null;
         }
       }
   
  
positive.code:   }
  
  
    insert(body) {
  
      var i = 0;
      var index;
  
      //  if we have subnodes ...
      if (this.nodes[0] != null) {
  
negative.code:     this.level = level == null ? 0 : level;
  
      this.bounds = new Bounds()
        ..x = Math.round(x)
        ..y = Math.round(y)
        ..width = width
        ..height = height
        ..subWidth = Math.floor(width / 2)
        ..subHeight = Math.floor(height / 2)
        ..right = Math.round(x) + Math.floor(width / 2)
        ..bottom = Math.round(y) + Math.floor(height / 2);
  
      this.objects.clear();
      //    for(int i=0;i<this.nodes.length;i++){
      //      this.nodes[i]=new
      //    }
      this.nodes[0] = this.nodes[1] = this.nodes[2] = this.nodes[3] = null;
    }
  
  