HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hasChildNodes guard</title>
</head>
<body>
  <div id="foo"><span>Hi</span></div>
  <pre id="out"></pre>
  <script>
    var foo = document.getElementById("foo");
    var msg = foo.hasChildNodes()
      ? String(foo.childNodes.length)
      : "no children";
    document.getElementById("out").textContent = msg;
  </script>
</body>
</html>

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Node.hasChildNodes — guard (Try It)