mfrohberg/jsbin.gecixa.html

## jsbin.gecixa.html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>

</body>
</html>

## jsbin.gecixa.js
var num = 0;
var arr = [];

Array.prototype.sum = function() {
  var a = this[0];
  for (var i = 1; i < this.length; i++) {
    a = a + this[i];
   }
  return a;
};

while (num < 999) {
  num++;
  if (num % 3 === 0 || num % 5 === 0) {
    arr.push(num);
    }
  }
console.log(arr.sum());
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>JS Bin</title>
	</head>
	<body>

	</body>
	</html>
	var num = 0;
	var arr = [];

	Array.prototype.sum = function() {
	var a = this[0];
	for (var i = 1; i < this.length; i++) {
	a = a + this[i];
	}
	return a;
	};

	while (num < 999) {
	num++;
	if (num % 3 === 0 \|\| num % 5 === 0) {
	arr.push(num);
	}
	}
	console.log(arr.sum());