Overriding Backbone Constructor.

backboneConstructor.js

Backbone.View.extend({
  constructor: function (options) {
    // Do stuff before the View has been setup
    
    Backbone.View.apply(this, arguments);
    
    // Do stuff after the View has been setup,
    // particularly after `initialize()` has been called

    return this;
  }
});

don't return this!!! you aren't supposed return things from constructors, in fact they should fail if you do

also technically this is just extending the constructor, you are not overriding it because you are calling the original constructor