Objects are one of the most important data structures in JavaScript. They allow you to store data as key-value pairs, making it easy to organize and manipulate complex information.

This blog will explain objects, their properties, methods, and practical examples.

⭐ 1. What Is an Object?

An object is a collection of properties.
Each property is a key (name) and a value.

Example:

let user = {
  name: "Sagar",
  age: 22,
  city: "Ludhiana"
};
console.log(user.name); // Sagar
console.log(user["city"]); // Ludhiana

⭐ 2. Creating Objects

Using Object Literal

let car = {
  brand: "Honda",
  model: "City",
  year: 2023
};

Using Object Constructor

let car = new Object();
car.brand = "Honda";
car.model = "City";
car.year = 2023;

⭐ 3. Accessing Object Properties

You can access properties in two ways:

Dot Notation

console.log(car.brand); // Honda

Bracket Notation

console.log(car["model"]); // City

⭐ 4. Modifying Object Properties

You can update or add new properties anytime.

car.year = 2024;          // Update
car.color = "Red";        // Add new property
console.log(car);

⭐ 5. Object Methods

Objects can have functions as properties, called methods.

let user = {
  name: "Sagar",
  greet: function() {
    console.log("Hello, " + this.name);
  }
};
user.greet(); // Hello, Sagar

ES6 Method Shorthand

let user = {
  name: "Sagar",
  greet() {
    console.log("Hello, " + this.name);
  }
};
user.greet(); // Hello, Sagar

⭐ 6. Looping Through Objects

for…in Loop

for (let key in user) {
  console.log(key + ": " + user[key]);
}

⭐ 7. Object Destructuring (ES6)

Easily extract properties into variables.

let {name, age} = user;
console.log(name); // Sagar
console.log(age);  // 22

⭐ 8. Object Methods: Object.keys(), Object.values(), Object.entries()

console.log(Object.keys(user));    // ["name","greet"]
console.log(Object.values(user));  // ["Sagar", function]
console.log(Object.entries(user)); // [["name","Sagar"], ["greet",function]]

⭐ Conclusion

Objects are a fundamental part of JavaScript. They allow you to store complex data, define methods, and structure your code efficiently. Mastering objects is essential for building dynamic web applications.

📌 Citations

🔗 View other articles about Javascript:
https://savanka.com/category/learn/js/

🔗 External Javascript Documentation:
https://www.w3schools.com/js/

What Are JavaScript Objects? See Examples