D3 Examples - practice

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <svg width="720" height="120">
   
    </svg>
  <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("svg");
​
    var circle = svg.selectAll("circle")
    .data([32, 57, 112, 293], function(d) { return d; });
    
   svg.transition()
        .delay(750)
      .styleTween("fill", function() { return d3.interpolate("lightblue", "pink"); });
​
    circle.enter().append("circle")
    .attr("cy", 60)
    .attr("cx", function(d, i) { return i * 100 + 30; })
    .attr("r", function(d) { return Math.sqrt(d); });
    
    circle.exit().transition().remove();
​
​
  </script>
</body>
​
    