D3 Examples - array filter

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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>
​
    var startArray = []
    var updateArray = ["dog"]
        
    if(startArray.length < updateArray.length) {
        var name = updateArray.filter(f => !startArray.includes(f));  
        console.log(name);
    } else {
        var name = startArray.filter(f => !updateArray.includes(f));
            console.log(name);      
    }
        
​
    
    
  
  </script>
</body>
​
    