Training Guide: Programming in HTML5 with JavaScript and CSS3 Ebook

Lesson 1: Creating JavaScript objects CHAPTER 6 265

FIGURE 6-1 he JavaScript object literal testT

Creating dynamic objects by using the factory pattern

In addition to using the JavaScript literal object syntax, JavaScript has an Object type, and you

can use it to create an object programmatically. Object has a prototype object that is cloned

when you use the new keyword to create a new Object instance. The prototype object has the

following inherited methods.

■■constructor The function that is called to initialize a new object

■■hasOwnProperty Returns a Boolean indicator of whether the current object has the

specified property

■■isPrototypeOf Returns a Boolean indicator of whether the current object is in the

specified object’s prototype object chain

■■propertyIsEnumerable Returns true if the object can be enumerated in a for...in

loop

■■toLocalString Converts a date to a string value based on the current local

■■toString Returns the string representation of the current object

■■valueOf Returns the value of the current object converted to its most meaningful

primitive value