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D3js Data Function

<!DOCTYPE html>
<html>
   <head>
      <script type = "text/javascript" src = "https://d3js.org/d3.v4.min.js"></script>
      <style>
         body { font-family: Arial; }
      </style>
   </head>

   <body>
      <p></p>
      <p></p>
      <p></p>
      <script>
         var data = [1, 2, 3];
         var paragraph = d3.select("body")
         .selectAll("p")
         .data(data)
         .text(function (d, i) {
            console.log("d: " + d);
            console.log("i: " + i);
            console.log("this: " + this);
            return "The index is " + i + " and the data is " + d;
         });
      </script>
   </body>
</html>

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