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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array map() — vs forEach</title>
</head>
<body>
  <h1>map() vs forEach()</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var nums = [1, 2, 3];
      var fromMap = nums.map(function (n) { return n * 10; });
      var fromForEach = nums.forEach(function (n) { return n * 10; });
      document.getElementById("out").textContent =
        "map: " + JSON.stringify(fromMap) + "\n" +
        "forEach: " + String(fromForEach);
    })();
  </script>
</body>
</html>

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JavaScript Array map() — vs forEach (Try It)