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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery.map() — add</title>
</head>
<body>
  <h1>Add 4 to each number</h1>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    (function () {
      var result = $.map([0, 1, 2], function (n) {
        return n + 4;
      });
      document.getElementById("out").textContent = JSON.stringify(result);
    })();
  </script>
</body>
</html>

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jQuery.map() — add to values (Try It)