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This effectively allows us to import them and locally alias them as we wish.
The Command pattern aims to encapsulate method invocation, requests or operations into a single object and gives us the ability to both parameterize and pass method calls around that can be executed at our discretion. It acts as a base class from which others are derived.
Subclass VehicleFactory to create a factory class that builds Trucks. As per this structure we should now add a definition for the carManager. We will be covering the Facade pattern shortly, but for reference purposes some developers may also wonder whether there are similarities between the Mediator and Facade patterns. From a historical perspective, the Module pattern was originally developed by a number of people including Richard Cornford in Instead, one must override all public methods which interact with the buggy privates.
Another piece of trivia is that if you’ve ever played with Yahoo’s YUI library, some of its features may patternns quite familiar and the reason for this is that the Module pattern was a strong influence for YUI when creating their components.
Views and controllers have a slightly different relationship. Also, every function takes up memory. Now of course, we have to keep in mind that jQuery and Sizzle – deskgn selector engine are doing a lot more behind the scenes to optimize our query and that a jQuery object, not just a DOM node is returned.
I will always be grateful for the talented technical reviewers who helped review and improve this book, including those from the community at large. Knowledge of anti-patterns is critical for success. The idea is that rather than sub-classing, we add decorate properties or methods to a base object so it’s a little more streamlined. In the section on the Observer pattern, we javaacript introduced to a way of channeling multiple event sources through a single object.
In large systems this may well be the case. What’s the most efficient way to query for this collection of elements?
In the above example, our Decorators are overriding the MacBook super-class objects.
Later on in this section we’re going to revisit the differences between Backbone and traditional MVC, but for now let’s focus on controllers.