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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Condense — iterative</title>
</head>
<body>
  <h1>Digital root (iterative)</h1>
  <p>Edit <code>number</code> (nonnegative integer), then click <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function condenseNumber(number) {
        var n = number;
        while (n > 9) {
          var sum = 0;
          var tmp = n;
          while (tmp > 0) {
            sum += tmp % 10;
            tmp = Math.floor(tmp / 10);
          }
          n = sum;
        }
        return n;
      }
      var number = 9875;
      var condensedNumber = condenseNumber(number);
      document.getElementById("out").textContent =
        "The condensed form of " + number + " is: " + condensedNumber;
    })();
  </script>
</body>
</html>

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JavaScript Condense a Number — iterative (Try It)