JavaScript: The Definitive Guide, Fourth Edition

Name

Object — a superclass that contains features of all

Availability

JavaScript objectsJavaScript 1.0; JScript 1.0; ECMAScript v1

Constructor

new Object(  )new 
Object(value)

Arguments

value

This optional argument specifies a primitive JavaScript value -- a number, boolean, or string -- that is to be converted to a Number, Boolean, or String object. This object is not supported prior to JavaScript 1.1 and ECMAScript v1.

Returns

If no value argument is passed, this constructor returns a newly created Object instance. If a primitive value argument is specified, the constructor creates and returns a Number, Boolean, or String object wrapper for the primitive value. When the Object( ) constructor is called as a function, without the new operator, it behaves just as it does when used with the new operator.

Properties

constructor

A reference to the JavaScript function that was the constructor for the object.

Methods

hasOwnProperty( )

Checks whether an object has a locally defined (noninherited) property with a specified name.

isPrototypeOf( )

Checks whether this object is the prototype object of a specified object.

propertyIsEnumerable( )

Checks whether a named property exists and would be enumerated by a for/in loop.

toLocaleString( )

Returns a localized string representation of the object. The default implementation of this method simply calls toString( ), but subclasses may override it to provide localization.

toString( )

Returns a string representation of the object. The ...