"I am Saqib Jahangir. A passionate vlogger, software engineer, trainer and avid traveler with a deep love for exploring the hidden gems of our beautiful planet. With a strong foundation in Application Development, Application Architecture & Database Design and Product Management, I bring over a decade of hands-on experience building secure, scalable, and resilient web applications for a diverse range of industries."

Objects

 

Objects are collections of key–value pairs, where keys (also called properties) are strings (or Symbols) and values can be any data type, including other objects and functions. They are used to represent real-world entities in code.

Object Literals

The simplest way to create an object is by using object literal syntax.

let person = {

  name: "John",

  age: 30,

  isEmployed: true

};

 

console.log(person); // {name: "John", age: 30, isEmployed: true}

Properties and Methods

  • Properties are values stored in the object.
  • Methods are functions defined inside an object.

let car = {

  brand: "Toyota",

  model: "Corolla",

  year: 2022,

  start: function() {

    console.log("Car started!");

  }

};

 

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

car.start(); // Car started!

this Keyword

Inside an object method, this refers to the object itself.

let user = {

  name: "Alice",

  greet: function() {

    console.log("Hello, my name is " + this.name);

  }

};

 

user.greet(); // Hello, my name is Alice

Accessing and Updating Properties

You can access object properties in two ways: dot notation and bracket notation.

let book = { title: "1984", author: "George Orwell" };

 

// Dot notation

console.log(book.title); // 1984

 

// Bracket notation

console.log(book["author"]); // George Orwell

 

// Updating property

book.title = "Animal Farm";

console.log(book.title); // Animal Farm

 

// Adding a new property

book.year = 1945;

console.log(book.year); // 1945

Nested Objects

Objects can contain other objects as values.

let student = {

  name: "Emma",

  grades: {

    math: 90,

    science: 85

  }

};

 

console.log(student.grades.math); // 90

 

// Updating nested property

student.grades.science = 95;

console.log(student.grades.science); // 95

 

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