D3 Examples - working with json

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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 somePeople = [{name: "Peter", age: 27}, {name: "Sulayman", age: 24},
//                                  {name: "K.C.", age: 49}];
    someNumbers = [17, 82, 9, 500, 40];
        someColors = ["blue", "red", "chartreuse", "orange"];
​
    smallerNumbers = someNumbers.filter(function(d) {return d <= 40});
        d3.select("body").selectAll("div")
        .data(smallerNumbers)
        .enter()
        .append("div")
        .html(function (d) {return d});
​
  </script>
</body>
​
    