D3 Examples - green circles in a line

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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!
    mydata = [0, 50, 120, 75, 100];
    var svg = d3.select("body").append("svg").selectAll("circle")
      .attr("width", 960)
      .attr("height", 500)
        .data(mydata).enter().append("circle")
        .attr("r", 5)
        .attr("cx", function(d) { 
        return d
      })
        .attr("cy", function(d) { return d})
        // > 100 ? purple
      // else green
        // .attr("fill", "green") 
        .attr("fill", function (d) {
        if (d > 100) { 
          return "purple";
        }
        else { 
          return "green"; 
        }
      })
​
​
  </script>
</body>
​
    