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  <title>Harshad — string digit sum</title>
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  <h1>Harshad check — string digit sum</h1>
  <p>Edit values in <code>tests</code>, then click <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function digitSumStr(n) {
        var digits = String(n).split("");
        var sum = 0;
        var i;
        for (i = 0; i < digits.length; i++) {
          sum += Number(digits[i]);
        }
        return sum;
      }
      function isHarshadStr(n) {
        if (n <= 0) {
          return false;
        }
        var s = digitSumStr(n);
        return s !== 0 && n % s === 0;
      }
      var tests = [18, 11, 1, 20];
      var lines = [];
      var i;
      for (i = 0; i < tests.length; i++) {
        var value = tests[i];
        var label = isHarshadStr(value) ? "Harshad" : "not Harshad";
        lines.push(value + ": " + label);
      }
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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JavaScript Harshad — String Digit Sum (Try It)