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You use objects to create entities, which are passed to and from the server, and to encapsulate functionality that you want to modularize. You also need to extend objects that others have created.
This chapter also introduces jQuery, the answer to writing browser-compatible code. In addition, jQuery is fun and easy to use.
Strings, numbers, and functions are all objects. You have learned how to create functions, so you already have exposure to creating objects, as you see in this lesson.
Estimated lesson time: 20 minutes Using object-oriented terminology In many object-oriented languages, when you want to create objects, you start by creating a class, which is a blueprint for an object. By using a house blueprint, you can create, or construct, many houses that are based on the blueprint.
Each house is an object of type house, also known as an instance of the house type. The developer writes the class, which is then used to construct objects. In a baseball application, you might create a Player classes are normally capitalized class that has properties for first and last name, batting average, error count, and so on. When you create your team, you might use the Player class to create nine Player objects, each having its own properties.
Each time you construct a Player object, memory is allocated to hold the data for the player, and each piece of data is a property, which has a name and a value. The three pillars of object-oriented programming are encapsulation, inheritance, and polymorphism.
Encapsulation means that you hide all details except those that are required to communicate with your object in order to simplify the object for anyone using the object. Polymorphism means that you can execute a function on the parent class, but the behavior changes morphs because your child class has a function that overrides the function in the parent class.
The parent class is also known as the base class, the super class, or the generalized class. The child class is also known as the derived class, the subclass, or the specialized class. In object-oriented programming, objects can have data implemented as properties and behaviors implemented as methods. Once you have submitted your order you will receive confirmation and status update emails. If you order multiple items and they are not all in stock, we will advise you of their anticipated arrival times.
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