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<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Strings</h1>
<h2>The lastIndexOf() Method</h2>
<p>lastIndexOf() returns the index of the last occurrence of a specified value in a string.</p>
<p>Find the last occurence of "planet":</p>
<p id="demo"></p>
<script>
let text = "Hello planet earth, you are a great planet.";
let result = text.lastIndexOf("planet");
document.getElementById("demo").innerHTML = result;
</script>
</body>
</html>