D3 Examples - objects and arrays

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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>
  // modify array1 so that each object it contains includes the 2 letter state "id"
​
  array1 = [
                    {name: "Arizona",  location: "Southwest"},
            {name: "Virginia", location: "East"},
            {name: "Florida",  location: "Southeast"}
           ];
    
  array2 = [
            {name: "Virginia", id: "VA"},
                    {name: "Arizona", id: "AZ"},
            {name: "Florida", id: "FL"}
                 ];
  
  array1.forEach(function(a1) {
    array2.forEach(function(a2) {
      if (a1.name == a2.name) {
        a2.id = a1.id;
      }
    })
  })
  
  // print all items that are in both array3 
  // and array4 to the console.
  
  array3 = ['a','b','c','d'];
  array4 = ['a','c','e','f','g'];
​
  </script>
</body>
​
​
    