D3 Examples - general Pattern Test

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
    
    function render(data){
      
      circles=d3.select("svg")
      .selectAll('circle')
      .data(data)
       
      circles
      .enter()
      .append("circle")     
        .attr("cy",250)
        .attr("r",100)
        .attr("fill","green")
      .merge(circles)
        .attr("cx",function(d){return d;})
      
      circles
      .exit()
        .remove()
           
    }
    
    
    render([200,500,700])
     render([200,500])
  
   
  
 
 
​
   
​
  </script>
</body>
​
    