D3 Examples - CheckName

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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>
    function checkName(name){
            try{
            if(typeof name === "undefined"){
                throw new Error("Name is missing. Can't say hello!");
            }
             showSuccessMessage(name);
        }catch(err){
            logErrorMessage(err);
        }
    }
    function showSuccessMessage (name){
      alert('Hello, ' + name + '!');
    }
​
    function logErrorMessage (err){
      console.log(err.message);
    }
    
    checkName();
    checkName("Fabian");
  </script>
</body>
​
    