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<head>
  <meta charset="utf-8">
  <title>lastIndexOf vs indexOf</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var anyString = "Brave, Brave New World";
    document.getElementById("out").textContent = [
      anyString.indexOf("Brave"),
      anyString.lastIndexOf("Brave"),
      "canal".lastIndexOf("a"),
      "canal".lastIndexOf("a", 2),
      "canal".lastIndexOf("a", 0),
      "canal".lastIndexOf("x")
    ].join("\n");
  </script>
</body>
</html>

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String.lastIndexOf() — vs indexOf (Try It)