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How to create an object in JavaScript?

Ravi Vishwakarma50717-Oct-2024

How to create an object in JavaScript? so that no anyone can change it.

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Updated on 18-Dec-2024
Ravi Vishwakarma

Ravi Vishwakarma

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Ravi Vishwakarma is a dedicated Software Developer with a passion for crafting efficient and innovative solutions. With a keen eye for detail and years of experience, he excels in developing robust software systems that meet client needs. His expertise spans across multiple programming languages and technologies, making him a valuable asset in any software development project.

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1 Answers

Anubhav Kumar

Anubhav Kumar

18-Dec-2024

In JavaScript, there are multiple ways to create an object. Here are the most common methods:

1. Using Object Literal

This is the simplest and most common way to create an object.

const person = {
  firstName: "John",
  lastName: "Doe",
  age: 30,
  greet: function () {
    console.log(`Hello, my name is ${this.firstName} ${this.lastName}.`);
  }
};

// Access properties
console.log(person.firstName); // Output: John
person.greet(); // Output: Hello, my name is John Doe.

2. Using the Object Constructor

You can create an object using the Object constructor.

const person = new Object();
person.firstName = "Jane";
person.lastName = "Doe";
person.age = 25;
person.greet = function () {
  console.log(`Hello, my name is ${this.firstName} ${this.lastName}.`);
};

// Access properties
console.log(person.lastName); // Output: Doe
person.greet(); // Output: Hello, my name is Jane Doe.

3. Using a Constructor Function

A constructor function is a reusable template for creating objects.

function Person(firstName, lastName, age) {
  this.firstName = firstName;
  this.lastName = lastName;
  this.age = age;
  this.greet = function () {
    console.log(`Hello, my name is ${this.firstName} ${this.lastName}.`);
  };
}

const person1 = new Person("Alice", "Smith", 28);
const person2 = new Person("Bob", "Johnson", 35);

console.log(person1.firstName); // Output: Alice
person2.greet(); // Output: Hello, my name is Bob Johnson.

4. Using ES6 Classes

The class syntax is a more modern and readable way to define reusable object templates.

class Person {
  constructor(firstName, lastName, age) {
    this.firstName = firstName;
    this.lastName = lastName;
    this.age = age;
  }

  greet() {
    console.log(`Hello, my name is ${this.firstName} ${this.lastName}.`);
  }
}

const person1 = new Person("Emily", "Davis", 40);
const person2 = new Person("Chris", "Brown", 50);

console.log(person1.age); // Output: 40
person2.greet(); // Output: Hello, my name is Chris Brown.

5. Using Object.create

This creates a new object with the specified prototype object.

const prototypeObject = {
  greet() {
    console.log(`Hello, my name is ${this.firstName} ${this.lastName}.`);
  }
};

const person = Object.create(prototypeObject);
person.firstName = "Sophia";
person.lastName = "Williams";
person.age = 22;

person.greet(); // Output: Hello, my name is Sophia Williams.

6. Using Factory Functions

A factory function is a function that returns a new object.

function createPerson(firstName, lastName, age) {
  return {
    firstName,
    lastName,
    age,
    greet() {
      console.log(`Hello, my name is ${this.firstName} ${this.lastName}.`);
    }
  };
}

const person = createPerson("Liam", "Jones", 27);
console.log(person.age); // Output: 27
person.greet(); // Output: Hello, my name is Liam Jones.

 

Summary Table

Method Suitable for
Object Literal Simple, static objects
Object Constructor Basic object creation
Constructor Function Reusable templates (ES5)
ES6 Classes Modern, reusable templates
Object.create Prototype-based inheritance
Factory Function Functional, flexible design

Each method has its use case, depending on the complexity and reusability of the objects you're working with.

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