Question

Forgive my ignorance, I want to know what is the difference between:

class Car extends Backbone.Model {

}

and

var Car = Backbone.Model.extend({

});

As silly as I was, the first expression is from coffee script syntax, which compiles to the lower one (not exactly, but does the same thing).

Answer 1

1. the first one is NOT javascript.
2. javascript extend is different from java extend

JavaScript’s dynamism allows us to add or replace methods of an
existing class. We can call the method method at any time, and all
present and future instances of the class will have that method. We
can literally extend a class at any time. Inheritance works
retroactively. We call this Class Augmentation to avoid confusion with
Java’s extends, which means something else.

from http://javascript.crockford.com/inheritance.html