ways of defining object js

Shristi Gautam answered on June 27, 2019 Popularity 10/10 Helpfulness 3/10

answer ways of defining object js

related javascript object

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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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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javascript object tutorial

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// JavaScript Object Tutorial

// Creating an object using object literal
var person = {
  name: "John",
  age: 30,
  profession: "Developer"
};

// Accessing object properties
console.log(person.name);
console.log(person.age);

// Modifying object properties
person.age = 31;
console.log(person.age);

// Adding new properties to the object
person.location = "New York";
console.log(person.location);

// Deleting a property from the object
delete person.age;
console.log(person.age); // undefined

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

// Checking if a property exists in the object
console.log("name" in person); // true
console.log("gender" in person); // false

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Contributed on Sep 12 2023

YOU.com

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js objects

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// To make an object literal:
const dog = {
    name: "Rusty",
    breed: "unknown",
    isAlive: false,
    age: 7
}
// All keys will be turned into strings!

// To retrieve a value:
dog.age; //7
dog["age"]; //7

//updating values
dog.breed = "mutt";
dog["age"] = 8;

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Contributed on Jan 05 2021

Lorenzo Satta Chiris

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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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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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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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ways of defining object js

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