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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>then() — transform</title>
</head>
<body>
  <h1>Transform chain</h1>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    (function () {
      var dfd = $.Deferred();
      dfd.resolve(5);
      dfd.then(function (n) {
        return n * 10;
      }).then(function (doubled) {
        document.getElementById("out").textContent = String(doubled);
      });
    })();
  </script>
</body>
</html>

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jQuery deferred.then() — transform chain (Try It)