I am currently transforming from `Java` to `Javascript`, and it's a bit hard for me to figure out how to extend objects the way I want it to do.

I've seen several people on the internet use a method called extend on object. The code will look like this:

```
var Person = {
   name : 'Blank',
   age  : 22
}

var Robot = Person.extend({
   name : 'Robo',
   age  : 4
)}

var robot = new Robot();
alert(robot.name); //Should return 'Robo'

```

Does anyone know how to make this work?
I've heard that you need to write

```
Object.prototype.extend = function(...);

```

But I don't know how to make this system work. If it is not possible, please show me another alternative that extends an object.