CONSTRUCTOR FUNCTION

CONSTRUCTOR FUNCTION :

The function statement is not the only way to define a new function but also, you can define your function dynamically using Function( ) constructor along with the new operator.

Syntax:

<script type="text/javascript">

var variablename = new Function(Arg1, Arg2..., "Function Body");

</script>

 Description:

• The Function() constructor expects any number of string arguments.
• The last argument is the body of the function - it can contain arbitrary JavaScript statements, separated from each other by semicolons.
• a function declaration is not an executable statement, it is not common to end it with a semicolon.
• Declared functions are not executed immediately. They are "saved for later use", and will be executed later, when they are invoked (called upon).

anonymous functions:(a function without a name)

The unnamed functions created with the Function() constructor are called anonymous functions.

Example:

<script type="text/javascript">

 var func = new Function("x", "y", "return x*y;");

 </script>

Reference from: http://www.tutorialspoint.com/javascript