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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array findIndex() — no match</title>
</head>
<body>
  <h1>findIndex() — nothing matches</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var numbers = [10, 20, 30, 40, 50];
      var index = numbers.findIndex(function (num) {
        return num > 100;
      });
      document.getElementById("out").textContent =
        index === -1
          ? "No element greater than 100 found."
          : "Found at index: " + index;
    })();
  </script>
</body>
</html>

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JavaScript Array findIndex() — no match (Try It)