what is an object in javascript

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Bilal Ahmad answered on June 27, 2019 Popularity 10/10 Helpfulness 2/10

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what is an object in javascript

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Objects are the collection of properties which contain values as key:value pairs.
A property is also like a variable which stores data, but in property we stores
data in key:value pair i.e, age:21
We access property of an objects by object_name.property_name

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Contributed on Jan 14 2023

Bilal Ahmad

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javascript object

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var	person = {
	first_name : "Marty",
  	last_name : "Mcfly",
	born : 1968,
	died : 1933,
    lovers: ["Jennifer Parker","Baines McFly"]
};

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Contributed on Jun 27 2019

Grepper

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javascript object

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/*
An object is made of key value pairs. Keys can be strings 
(which don't require quotes), array with a string, or symbols. Values can be arrays,
objects, numbers etc
*/

let testSymbol = Symbol('item number 3')

const obj = {
	item1: 1,
    "item number 2": 2,
    testSymbol: 3,
  	['a']: 4
}

// Another way of creating an object:
const obj = new Object();
obj.name = 'John'

// To access values, you can use dot notation or bracket notation. 
// Both do the same thing, bracket notion is useful for multispace keys,
// keys with dashes, or accessing values using variables
> obj.item1
> obj['item number 2']

> let b = 'item1'
  obj[b]
  // The following would NOT work and would return undefined:
  obj.b

// Checking exsistence of keys in object:
obj.toString ----- checks values of object and whatever object inherits from
> returns true

obj.hasOwnProperty('toString') ----- checks values of object only. Do this instead of checking like: (obj.name !== undefined)
> returns false


// Short hand key assignment:
const name = 'John'
const obj2 = {
    // this is short hand that automatically sets the key to be 'name',
    // and it's value to be 'John'
	name, 
}

// Constructor objects:
function Obj(name, age){
	this.name = name
  	this.age = age
}

const person = new Obj('john', 1)

// adding functions, couple ways:
const obj = {
  	name: 'Mike',
  	number: 4421,
	sayHi: () => console.log('hi'),
  	sayBye() {
    	console.log('say bye')
    },
    // getter function to get values from object. Has different usecases, but the same as doing obj.number
  	get getNumber(){
    	return this.number
    }
    // setter function to set values in object. Has different usecases, but the same as doing obj.number = 152
    set setNumber(num){
    	this.number = num
    }
}

obj.sayHi()
obj.sayBye()
obj.getNumber //Note how it's being accessed like a standard property, and not a function
obj.setNumber //Note how it's being accessed like a standard property, and not a function

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Contributed on Jan 23 2022

QuietHumility

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ways of defining object js

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1) Object Literal
	const obj = {
    	name: "Ram",
      	age: "20"
    }
2) Constructor Function or ES6- Class
   const a = new Person("Ram", "25") //given Person is an existing function or class
3) Object.create method
	const ram = Object.create(Person); //given person is an existing object

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Contributed on Mar 16 2022

Shristi Gautam

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What is an object

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The Object is the real-time entity having some state and behavior. 
In Java, Object is an instance of the class having the instance variables 
as the state of the object and the methods as the behavior of the object. 
The object of a class can be created by using thenewkeyword

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Contributed on Nov 28 2020

Thankful Tuatara

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how to declare object in javascript

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var myObject = {}; // Empty object

// Object with properties
var person = {
  name: "John Doe",
  age: 30,
  occupation: "Developer"
};

console.log(person.name); // Output: "John Doe"
console.log(person.age); // Output: 30
console.log(person.occupation); // Output: "Developer"

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Contributed on Sep 12 2023

YOU.com

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Object in js

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object in js

const person = {
  firstName: 'John',
  lastName: 'Doe',
  age: 30
};
console.log(person); // logs {firstName: "John", lastName: "Doe", age: 30}

The object data type is used to represent a collection of key-value pairs. An object can be created using the curly braces {} syntax or the new Object() syntax. For example:

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Contributed on Apr 03 2023

MAKSTYLE119

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javascript object

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const obj = {
    name: "Mon contenu",
    id: 1234,
    message: "Voici mon contenu",
    author: {
        name: "John"
    },
    comments: [
        {
            id: 45,
            message: "Commentaire 1"
        },
        {
            id: 46,
            message: "Commentaire 2"
        }
    ]
};

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Contributed on Aug 23 2022

Ndèye Awa Zongo

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JS define object

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// Using object literal notation
const person = {
  name: 'John Doe',
  age: 30,
  occupation: 'Developer',
};

// Accessing object properties
console.log(person.name);        // Output: John Doe
console.log(person.age);         // Output: 30
console.log(person.occupation);  // Output: Developer

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Contributed on Sep 11 2023

YOU.com

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what is object in js

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// JavaScript objects are a fundamental data structure used to represent various entities.
// They have properties that can be used to store key-value pairs of data.

// Create an object using object literal notation
const person = {
  name: "John",
  age: 25,
  city: "New York"
};

// Accessing object properties
console.log(person.name);  // Output: "John"
console.log(person.age);   // Output: 25

// Adding a new property to the object
person.gender = "Male";

// Updating an existing property
person.age = 26;

// Deleting a property
delete person.city;

// Looping through object properties
for (let key in person) {
  console.log(key + ": " + person[key]);
}

// Output:
// name: John
// age: 26
// gender: Male

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Contributed on Sep 12 2023

YOU.com

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what is an object in javascript

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