Object Oriented Programming in JavaScript

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Object Oriented Programming

Object-oriented programming (OOP) is a programming language model organized around objects rather than “actions” and data rather than logic.

Concepts of OOP

Encapsulation
Abstraction
Inheritance
Polymorphism

Objects

An object is a collection of properties, and a property is an association between a name (or key) and a value. A property’s value can be a function, in which case the property is known as a method. In addition to objects that are predefined in the browser, you can define your own objects.

Type of Objects

User-defined Objects – These are custom objects created by the programmer to bring structure and consistency to a particular programming task.

Native Objects – These are provided by the JavaScript language itself like String, Number, Boolean, Function, Date, Object, Array, Math, RegExp, Error as well as object that allow creation of user-defined objects and composite types.

Host Objects – These objects are not specified as part of the JavaScript language but that are supported by most host environments, typically browsers like window, navigator.

Document Objects – These are part of the Document Object Model (DOM), as defined by the W3C. These objects presents present the programmer with a structured interface to HTML and XML documents. Access to the document objects is provided by the browser via the document property of the window object (window.document).