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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array indexOf() — not found</title>
</head>
<body>
  <h1>indexOf() — not found</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var colors = ["red", "blue", "green"];
      var index = colors.indexOf("purple");
      var lines = [String(index)];
      if (index !== -1) {
        lines.push("Found at " + index);
      } else {
        lines.push("Not in array");
      }
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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