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<html><body><h1>JavaScript Sets</h1><h2>The add() Method</h2><p>The add() method adds values to a Set:</p><p id="demo"></p><script>// Create a Setconst letters = new Set();// Add values to the Setletters.add("a");letters.add("b");letters.add("c");letters.add("c");letters.add("c");letters.add("c");letters.add("c");letters.add("c");// Display set.sizedocument.getElementById("demo").innerHTML = "The set has " + letters.size + " values.";</script></body></html>