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  <meta charset="utf-8">
  <title>Maximum value — reference</title>
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  <h1>Find maximum in an array</h1>
  <p>Edit <code>array</code>, then <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function findMax(arr) {
        var maxVal = arr[0];
        var i;
        for (i = 1; i < arr.length; i++) {
          if (arr[i] > maxVal) {
            maxVal = arr[i];
          }
        }
        return maxVal;
      }
      var array = [14, 7, 25, 31, 10, 42];
      var maxValue = findMax(array);
      var lines = [];
      lines.push("Array: " + array.join(", "));
      lines.push("Maximum value in the array: " + maxValue);
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Maximum Value of an Array — Reference (Try It)