I came across John Resig's slideshow at http://ejohn.org/apps/learn/#78
I'm a bit confused about the necessity of using .prototype in the statement Me.prototype = new Person();
function Person(){}
Person.prototype.getName = function(){
return this.name;
};
function Me(){
this.name = "John Resig";
}
Me.prototype = new Person();
var me = new Me();
assert( me.getName(), "A name was set." );
Consider this perspective: if each individual is going to be given a name, it becomes simpler to assign the getName function to its prototype.
In this scenario, you create a Person with a prototype function for obtaining a name. Then, a few lines down, you define a Me function that automatically sets a name. Since we want to include the getName function, we utilize the Person which already includes that function object. When you instantiate Me() and assign it to me, you can invoke getName() to retrieve the name, defaulting to "John Resig".
The same outcome can be achieved without prototyping, like so:
function Me(){
this.name = "John Resig";
this.getName = function () {
return this.name;
}
}
var me = new Me();
...HOWEVER, utilizing prototypes streamlines object creation and enhances efficiency. You may also find more information in this explanation.
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