It supports object-oriented programming through a number of features:
- Objects are created from constructor functions.
- Each constructor function represents a unique object type.
- A constructor function can define properties and methods for all objects created from this constructor function.
- Each constructor function can be associated with a prototype object.
- An object automatically inherits properties and methods of the prototype object associated with its constructor function.
- Each object can its own properties and methods.
- Inherited properties and methods can be overridden by an specific object or the prototype object.
- There is one built-in constructor function called "Object()" that provides the base object type for all other object types.
- All functions are actually objects created from the base constructor function called "Function()".
- All objects of all types are inheriting properties and methods defined by the base constructor function "Object()".
- There are several major built-in objects, representing constructor functions, including
"Array()", "Boolean()", "Date()", "Error()", "Function()", "Math()", "Number()", "Object()", "RegExp()", "String()".
Several tutorial examples will be provided later in this chapter to illustrate some of those features.
Table of Contents
About This Book
Data Types, Variables and Expressions
Flow Control Statements
Creating, Accessing, and Manipulating Arrays
Defining and Calling Functions
Server-Side and Client-Side Web Scripting
Introduction to Objects
►Defining Your Own Object Types
Prototype-Dased Object-Oriented Programming Style
Defining Object Constructor Functions
Adding Properties and Methods to Objects
"for ... in" and "for each ... in" Statements
"prototype" Property of the Constructor Function Object
"instanceof" Operator - Determining Object Type
"typeof" Operator and Data Types
Inheritance of Properties and Methods through the Prototype Object Chain
Using Functions as "Function" Objects
Introduction to Built-in Object Types
W3C's Document Object Model (DOM) Specifications
PDF Printing Version