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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array filter() — remove null</title>
</head>
<body>
  <h1>filter() — remove null/undefined</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var values = [10, null, 20, undefined, 30, 0];
      var cleaned = values.filter(function (value) {
        return value != null;
      });
      document.getElementById("out").textContent = JSON.stringify(cleaned);
    })();
  </script>
</body>
</html>

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JavaScript Array filter() — remove null (Try It)