JS Tutorials
JS Introduction
JS Syntax
JS Comments
JS Variables
JS Operators
JS Data Types
JS Functions
JS Objects
JS Numbers
JS Arrays
JS Array Methods
JS Booleans
JS Events
JS Strings
JS Dates
JS Maths
JS Objects
Object Definition
Object Properties
Object Methods
Object Display
Object Prototypes
Object Iterables
Object Sets
Object Maps
Object References
JS Functions
Function Definition
Function Parameters
Function Invocation
Function Call
Function Apply
Function ClosuresJS Classes
Class Intro
Class Inhertitance
Class Static
JS Async
JS Callbacks
JS Aysnchronous
JS Promises
JS ASync/Await
Previous
JavaScript ES5 Object Methods
ECMAScript 5 (2009) added a lot of new Object Methods to JavaScript.
Managing Objects
// Create object with an
existing object as prototype
Object.create()
// Adding or changing an
object property
Object.defineProperty(object, property,
descriptor)
// Adding or changing
object
properties
Object.defineProperties(object,
descriptors)
// Accessing
Properties
Object.getOwnPropertyDescriptor(object,
property)
// Returns all properties
as
an array
Object.getOwnPropertyNames(object)
// Accessing the
prototype
Object.getPrototypeOf(object)
// Returns enumerable
properties as an array
Object.keys(object)
Protecting Objects
// Prevents adding
properties
to an object
Object.preventExtensions(object)
// Returns true if
properties
can be added to an object
Object.isExtensible(object)
// Prevents changes of
object
properties (not values)
Object.seal(object)
// Returns true if object
is
sealed
Object.isSealed(object)
// Prevents any changes to
an
object
Object.freeze(object)
// Returns true if object
is
frozen
Object.isFrozen(object)
Syntax
Object.defineProperty(object, property, {value :
value})