Comma Operator

The comma operator allows execution of more than one operation in a single statement:


var num1=1, num2=2, num3=3;

When comma operator is used in assignment statement, the comma operator returns the last item:

 
<!DOCTYPE html>
<html>
<head>
    <title>Example</title>
    <script type="text/javascript">
    
        var num = (1, 2, 3, 4, 5); 
        document.writeln(num);//num is 5 
       
    </script>
</head>
<body>
</body>
</html>

Click to view the demo