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  <meta charset="utf-8">
  <title>Array.from() — Set</title>
</head>
<body>
  <h1>Array.from() — Set + map</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var fruits = new Set(["apple", "orange", "banana"]);
      var upper = Array.from(fruits, function (fruit) {
        return fruit.toUpperCase();
      });
      document.getElementById("out").textContent = JSON.stringify(upper);
    })();
  </script>
</body>
</html>

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JavaScript Array.from() — Set with map (Try It)