Writing Scripts in Nashorn - Scripting in Java: Integrating with Groovy and JavaScript - page 135

Table 4-11. The List of Properties and Methods of Object with Their Descriptions

Property/Method Description

Object.prototype It is the prototype object for Object . Its

writable , enumerable , and configurable
properties are set to false

Object.prototype.constructor Contains reference to the constructor

function that creates the object

Object.create(p, descriptor) Creates a new object setting the specified p

as the prototype and adding all properties
in the descriptor to the new object. The
descriptor parameter is optional

Object.defineProperties(obj,
descriptors)

Creates or updates properties of the
specified object

Object.defineProperty(obj, prop,
descriptor)

Creates or updates the specified property
with of the specified object

Object.freeze(obj) Freezes the specified object by making

it nonextensible, nonconfigurable, and
making all its properties read-only

Object.getOwnPropertyDescriptor(obj,
prop)

Returns a property descriptor for the
specified property of the specified object

Object.getOwnPropertyNames(obj) Returns an array containing names of all

own properties of the specified object. The
array also includes the nonenumerable
properties

Object.getPrototypeOf(obj) Returns the prototype of the specified

object

Object.isExtensible(obj) Returns true of the specified object is

extensible, false otherwise

Object.isFrozen(obj) Returns true of the specified object is

frozen, false otherwise

Object.isSealed(obj) Returns true of the specified object is

sealed, false otherwise

Object.keys(obj)

Returns an array containing the names of
all enumerable, noninherited properties of
the specified object

Object.preventExtensions(object) Makes the specified object nonextensible

so that no new properties can be added to
the object

( continued )