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<head>
  <meta charset="utf-8">
  <title>Array forEach() — build</title>
</head>
<body>
  <h1>forEach() — build array</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var numbers = [1, 2, 3, 4, 5];
      var doubled = [];
      numbers.forEach(function (num) {
        doubled.push(num * 2);
      });
      document.getElementById("out").textContent = JSON.stringify(doubled);
    })();
  </script>
</body>
</html>

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JavaScript Array forEach() — build array (Try It)