You can edit / change the code and click run button <p>Sum of all arguments:</p> <p id="demo"></p> <script> function totalSum() { var i, sum = 0; for(i = 0; i < arguments.length; i++) { sum += arguments[i]; } return sum; } document.getElementById("demo").innerHTML = totalSum(500, 53, 400, 555, 454, 68); </script>