JavaScript_Succinctly

object.
}
// Logs bar, foo's value is found via the scope chain in the head
console.log(foo);
} ();
myApp();
Had I placed the foo property outside of the global scope, the console.log function
would return undefined. This is demonstrated in the next code example.
Sample: sample66.html
var myFunction = function () { var foo = 'bar' }; // foo is now in the
scope of myFunction()
var myApp = function () {
var run = function () {
console.log(foo); // foo is undefined, no longer in the global
scope, an error occurs.
} ();
}
myApp();
In the browser environment, this is why global property methods (e.g.,
window.alert()) can be invoked from any scope. What you need to take away from
this is that anything in the global scope is available to any scope, and thus gets the title
of "global variable" or "global property.”
Notes
There is a slight difference between using var and not using var in the global scope
(global properties vs. global variables). Have a look at this Stack Overflow exchange for
the details: Difference between using var and not using var in JavaScript.
Referring to the head object
There are typically two ways to reference the head object. The first way is to simply
reference the name given to the head object (e.g., in a web browser this would be
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