https://www.w3schools.com › js › js_object_properties.asp

The Object.defineProperty() method can be used to: Syntax: Object.defineProperty (object, property, descriptor) This example adds a new property to an object: Example. // Create an Object: const person = { firstName: "John", lastName : "Doe", language : "EN" }; // Add a Property Object.defineProperty(person, "year", {value:"2008"});

https://developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › Object

Nearly all objects in JavaScript are instances of Object; a typical object inherits properties (including methods) from Object.prototype, although these properties may be shadowed (a.k.a. overridden).

https://developer.mozilla.org › en-US › docs › Web › JavaScript › Guide › Working_with_objects

The same way, JavaScript objects can have properties, which define their characteristics. In addition to objects that are predefined in the browser, you can define your own objects. This chapter describes how to use objects, properties, and methods, and how to create your own objects.

https://developer.mozilla.org › fr › docs › Web › JavaScript › Guide › Working_with_objects

JavaScript est conçu autour d'un paradigme simple, basé sur les objets. Un objet est un ensemble de propriétés et une propriété est une association entre un nom (aussi appelé clé) et une valeur. La valeur d'une propriété peut être une fonction, auquel cas la propriété peut être appelée « méthode ».

https://stackoverflow.com › questions › 208016

In modern browsers (IE9+, FF4+, Chrome5+, Opera12+, Safari5+) you can use the built in Object.keys method: var keys = Object.keys(myObject); The above has a full polyfill but a simplified version is: var getKeys = function(obj){. var keys = [];

https://www.javascripttutorial.net › javascript-objects

To create an object with properties, you use the key:value within the curly braces. For example, the following creates a new person object: firstName: 'John', lastName: 'Doe' . The person object has two properties firstName and lastName with the corresponding values 'John' and 'Doe'.

https://javascript.info › object

A property has a key (also known as “name” or “identifier”) before the colon ":" and a value to the right of it. In the user object, there are two properties: The first property has the name "name" and the value "John". The second one has the name "age" and the value 30.

https://www.javascripttutorial.net › javascript-object-properties

Objects have two types of properties: data and accessor properties. A data property contains a single location for a data value. A data property has four attributes: [[Configurarable]] – determines whether a property can be redefined or removed via delete operator. [[Enumerable]] – indicates if a property can be returned in the for...in loop.

https://javascript.info › object-properties

Object properties configuration. In this section we return to objects and study their properties even more in-depth. Property flags and descriptors Property getters and setters. Ctrl + ← Ctrl + →.

https://www.w3schools.com › js › js_object_property.asp

Properties are the most important part of JavaScript objects. Properties can be changed, added, deleted, and some are read only. The syntax for accessing the property of an object is: // objectName.property let age = person.age; or. //objectName["property"] let age = person ["age"]; or. //objectName[expression] let age = person [x]; Examples.