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  <title>GCD + LCM</title>
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<body>
  <h1>GCD helper and LCM identity</h1>
  <p>Edit values in <code>pairs</code>, then click <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function gcd(a, b) {
        a = Math.abs(a);
        b = Math.abs(b);
        while (b !== 0) {
          var temp = b;
          b = a % b;
          a = temp;
        }
        return a;
      }
      function lcm(a, b) {
        if (a === 0 || b === 0) {
          return 0;
        }
        return Math.abs(a * b) / gcd(a, b);
      }
      var pairs = [[48, 18], [17, 13], [0, 21], [-12, 18]];
      var lines = [];
      for (var i = 0; i < pairs.length; i++) {
        var a = pairs[i][0];
        var b = pairs[i][1];
        var g = gcd(a, b);
        lines.push("gcd(" + a + ", " + b + ") = " + g + ", lcm = " + lcm(a, b));
      }
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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JavaScript GCD + LCM — Helper Functions (Try It)