Objects and its Internal representation in JavaScript

As we all know object is a collection of properties and it is associated between a name or key and a value.

for example

If your object is car and properties are color,weight,model etc.,

We can create object in many ways

Object Literal-Direct way


Object Instance

Object constructor

object assign

  1. A JavaScript object Literal is a comma-separated list of name-value pairs wrapped in curly braces separating the keys and values, and a comma after every key:value pair, except for the last, just like a regular array.

For Example

var car= {
color: “white”,
name: “benz”,
price: “27L”,
updateprice: () => {
// logic to update price
grade: [‘A’, ‘A+’, ‘A’]

2.This method creates a new object with the specified prototype and properties of the old object

For Example

var newstudent=object.create(student){






//logic of updateaddress}


3.”instance” can be used informally to mean an object created using a particular constructor function.

For Example

const newObj = new Object();
newObj.name = ‘Mahesh’;
newObj.location = ‘Delhi, India’;

4.A constructor is a function that creates an instance of a class which is typically called an “object”. It is called when you declare an object using the new keyword.

For Example

function Vehicle(name, model) {
this.name = name;
this.model = model;

let car1 = new Vehicle(‘Fiesta’, ‘2019’);
let car2 = new Vehicle(‘DC avanti’, ‘2018’);

5.The method copies all enumerable own properties from one or more source objects to a target objects. It returns the target object.

For Example

const target = { a: 1, b: 2 };
const source = { b: 4, c: 5 };

const returnedTarget = Object.assign(target, source);

// expected output: Object { a: 1, b: 4, c: 5 }

// expected output: Object { a: 1, b: 4, c: 5 }



Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store
Jagan mohan

Strings,Booleans can be classified as primitive data types whereas Arrays and Objects are composite data types