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<head>
  <meta charset="utf-8">
  <title>Array findLastIndex() — vs findIndex</title>
</head>
<body>
  <h1>findIndex vs findLastIndex</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var numbers = [1, 2, 3, 4, 5, 2];
      var firstTwo = numbers.findIndex(function (n) { return n === 2; });
      var lastTwo = numbers.findLastIndex(function (n) { return n === 2; });
      document.getElementById("out").textContent =
        "findIndex: " + firstTwo + "\n" +
        "findLastIndex: " + lastTwo;
    })();
  </script>
</body>
</html>

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JavaScript Array findLastIndex() — vs findIndex (Try It)