object in javascript

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Anshul Soni answered on June 27, 2019 Popularity 7/10 Helpfulness 2/10

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How to Create Objects in JavaScript?

// Create an object using object literals
const person1 = {
  firstName: 'John',
  lastName: 'Doe',
  age: 30,
  getFullName: function() {
    return this.firstName + ' ' + this.lastName;
  }
};

// Create an object using constructor functions
function Person2(firstName, lastName, age) {
  this.firstName = firstName;
  this.lastName = lastName;
  this.age = age;
  
  this.getFullName = function() {
    return this.firstName + ' ' + this.lastName;
  };
}

const person2 = new Person2('Jane', 'Doe', 25);

// Create an object using the ES6 class syntax
class Person3 {
  constructor(firstName, lastName, age) {
    this.firstName = firstName;
    this.lastName = lastName;
    this.age = age;
  }
  
  getFullName() {
    return this.firstName + ' ' + this.lastName;
  }
}

const person3 = new Person3('Jim', 'Smith', 35);

// Output the object properties to the console
console.log(person1.firstName + ' ' + person1.lastName);
console.log(person2.firstName + ' ' + person2.lastName);
console.log(person3.firstName + ' ' + person3.lastName);

In this example, we've created three different objects using object literals, constructor functions, and the ES6 class syntax. We've also added comments to explain what each section of the code is doing, which can make it easier for other developers (or yourself in the future) to understand the code. Finally, we've outputted the object properties to the console so that we can see the results of the code in action.

coded by Anshul Soni

see my website now: https://anshulsoni.tech

Popularity 7/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript object

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Contributed on Apr 13 2023

Anshul Soni

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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"]
};

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jun 27 2019

Grepper

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javascript object

Comment

/*
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

Popularity 10/10 Helpfulness 3/10 Language javascript

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Contributed on Jan 23 2022

QuietHumility

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how to declare object in javascript

Comment

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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what is an object in javascript

Comment

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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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:

Popularity 9/10 Helpfulness 2/10 Language javascript

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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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Source: openclassrooms.com

Tags: javascript j

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Contributed on Aug 23 2022

Ndèye Awa Zongo

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JS define object

Comment

// 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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create object javascript

Comments(1)

let voleur = {
     action     : () =>console.log ('Coup de dague fatal') ,
     crie      : ('pour la horde!!!!') ,
     coupfatal :()=> console.log ('coup dans le dos')

}

voleur.action() ;
voleur.coupfatal() ;
console.log(voleur.crie) ;

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Contributed on Mar 16 2020

Crevure 01

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javaScript object

Comment

var emp = {
name: "khan",
age: 23
};

Popularity 10/10 Helpfulness 2/10 Language javascript

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Contributed on Sep 13 2022

Umar code solver

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what is object in js

Comment

// 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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object in javascript

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