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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array entries() — find index</title>
</head>
<body>
  <h1>entries() — find first match</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var colors = ["red", "green", "blue"];
      var target = "green";
      var result = "Not found";
      for (var pair of colors.entries()) {
        if (pair[1] === target) {
          result = "Found " + target + " at index " + pair[0];
          break;
        }
      }
      document.getElementById("out").textContent = result;
    })();
  </script>
</body>
</html>

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JavaScript Array entries() — find index (Try It)