Get nodes on exit

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    svg { width:100%; height: 100% }
  </style>
</head>

<body>
  <script>
    // Feel free to change or delete any of the code you see!
    var svg = d3.select("body").append("svg")
    
    function addRects(data){
      var rectSize = 50;
      var rects = svg.selectAll('rect')
        .data(data);
      rects.enter().append("rect");
      rects.attr({
          x: function(d, i){ return (rectSize + 10) * i; }, 
          y: 10, 
          width: rectSize, 
          height: rectSize,
        	display:'block'
        })
        .style({ fill: "#a72d1a"});
      rects.exit().each(function(d){
      	console.log('exit nodes:', this);
        d3.select(this)
        	.style({display:'none'})
      });
    }
	
    addRects([1, 2, 3, 4]);
    addRects([5, 6]);
    
    
  </script>
</body>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js