JavaScript 2.0-The Complete Reference, Second ... - freecodingtutorial

}
}
inner1(); // this will error because inner1 is local to testFunction
While using local functions provides us with some ability to create stand-alone modules of
code, such techniques are rarely seen in JavaScript. Part of the reason is that local (or
―nested‖) functions have been supported only since the 4.x generation of browsers. The other
reason, of course, is that unfortunately most JavaScript programmers do not practice such
modular coding styles.
Functions as Objects
As we‘ll see in the next chapter, in JavaScript just about everything that is not primitive data is
an object, and functions are no exception. Thus, it is possible to define functions in a much
different way than we have seen up until now, by using the keyword new and the Function
object. For example, here we define a function and assign it to the variable sayHello. Notice
that Function is capitalized, as we are talking about creating an instance of JavaScript‘s built-in
Function object:
var sayHello = new Function("alert('Hello there');");
Later on we can then use the assigned variable sayHello just like a regular function call:
sayHello();
Because functions are first-class data types, the function can even be assigned to another
variable and used by that name instead.
var sayHelloAgain = sayHello;
sayHelloAgain();
To expand the example, we could define a function with a parameter to print out
var sayHello2 = new Function("msg","alert('Hello there '+msg);");
and call it:
sayHello2('Thomas');
The general syntax for the Function() constructor is
var functionName = new Function("argument 1",..."argument n",