Object Definition

Methods for Defining JavaScript Objects

Using an Object Literal
Using the new Keyword
Using an Object Constructor
Using Object.assign()
Using Object.create()
Using Object.fromEntries()

JavaScript Object Literal

An object literal is a collection of property names and their corresponding values enclosed in curly braces {}.

{firstName:“John”, lastName:“Doe”, age:50, eyeColor:“blue”};

Note:
An object literal is also known as an object initializer.

Creating a JavaScript Object

Examples

Create an empty JavaScript object using {}, and then add four properties to it.

// Create an Object
const person = {};

// Add Properties
person.firstName = “John”;
person.lastName = “Doe”;
person.age = 50;
person.eyeColor = “blue”;

Create an empty JavaScript object using new Object(), and then add four properties to it.

// Create an Object
const person = new Object();

// Add Properties
person.firstName = “John”;
person.lastName = “Doe”;
person.age = 50;
person.eyeColor = “blue”;

Note:

The examples above achieve the same result. However, there is no need to use new Object().

For better readability, simplicity, and performance, it’s recommended to use the object literal method.