D3 Examples - Power of Data Redo

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
   <script src="https://d3js.org/d3.v3.min.js"></script>
  <style>
    div.bar {
      display: inline-block;
      width: 20px;
      height: 75px; /* Gets overriden by D3-assigned height below */
      margin-right: 2px;
      background-color: teal;
     }
  </style>
</head>
​
<body>
  <script>
   /*
    Is this not boring?
    wish I could use underscore.js
 */
var dataset = Array.apply(null, {length: 25})
    .map(function(){return Math.round(Math.random() * 30);});
​
d3.select("body").selectAll("div")
    .data(dataset)  // <-- The answer is here!
    .enter()
    .append("div")
    .attr("class", "bar")
    .style("height", function(d) {
        var barHeight = d * 5;
        return barHeight + "px";
    });
  </script>
</body>
​
    