JavaScript Tutorial (original) (raw)

Last Updated : 05 Jun, 2025

JavaScript is a programming language used to create dynamic content for websites. It is a lightweight, cross-platform, and single-threaded programming language. It's an interpreted language that executes code line by line, providing more flexibility****.**

Why Learn JavaScript?

Write and Run Your First JavaScript Program

Mostly browsers can run JavaScript directly, so there's no need to install a compiler. However, the built-in browser console isn’t very beginner-friendly. That’s why we’ve added an online editor below to help you get started easily.

JavaScript `

console.log("Hello World!");

`

Before we start, We recommend you to edit the code and try to print your own name.

**Fundamentals

Let's Explore **JavaScript's fundamentals which will help build you a understanding to start with JavaScript

Functions and Events

Functions in JavaScript are reusable blocks of code that perform a specific task. Events are actions that happen in the browser, such as mouse clicks, keyboard input, or page loading.

JavaScript Beginner Projects

Now you have a basic understanding of JavaScript. So start with some beginner level projects to clear your concept and to implement in real world applications.

JavaScript Data Structure

JavaScript provides a versatile set of data structures that help in efficient data storage, manipulation, and problem-solving. In this section, we will explore each data structure and algorithm in detail.

JavaScript's built-in utilities and ES6+ enhancements provide additional data structures, including the following

To learn data structure and algorithm with JavaScript in detail, you can refer to our DSA with JavaScript Tutorial.

Object Oriented Programming

Object-Oriented Programming (OOP) in JavaScript, a concept that enables the structure of code by modeling real-world entities as objects with properties and behaviors.

Browser and Document Object Model

Asynchronous JavaScript

Now you have a good understanding of JavaScript. So let's implement all these in some real world applications.

JavaScript JSON

It is a lightweight data format for storing and exchanging data widely used to send data between a server and a client.

Regular Expression and Validation

Regular expressions plays important role for validation. Validations help ensure that data entered by users meets specific criteria.

**Exception and Error Handling

Exception and Error handling is crucial for ensuring the reliability and stability of JavaScript applications by handling errors effectively

Testing and Performance Optimization

Interesting Facts

This section covers all the interesting facts and features which made JavaScript so popular and will easy if you are switching from other programming languages also.

JavaScript Advanced Projects

Now you have covered almost all the important concepts of JavaScript. These projects will improve and revise your JavaScript Knowledge.

For all lists of Projects follow the article- JavaScript Project Ideas with Source Code

JavaScript Quiz

This section offers a collection of practice Quiz designed to test and support understanding of various concepts in JavaScript.

JavaScript Practice

The javaScript Coding Practice Problems page offers exercises for all skill levels, covering basic Numbers, String to advanced structures like Stack, Queue. These problems help build a strong foundation and boost confidence in solving real-world coding challenges.

JavaScript Exercises

Interview Questions

This section provides a list of interview questions related to JavaScript.

For a quick recap of JavaScript read the article - JavaScript Cheat Sheet

Libraries and Frameworks

JavaScript libraries and frameworks play a important role in modern web development. They offer built-in functions and methods that enhance web pages, making them more dynamic and interactive. They handle repetitive tasks, allowing developers to focus on core functionality.

Also, they provide project structure and data flow structure that helps to create fast and more reliable applications.

JavaScript-Frameworks-and-Libraries

JavaScript Tutorial- Libraries and Frameworks

**Libraries

Libraries provide pre-built solutions for common tasks. Developers can use these functions instead of writing code from scratch, saving valuable time. Here are a few popular libraries of JavaScript.

**Frameworks

Frameworks, offer a comprehensive structure for building applications. Here are a few popular frameworks of JavaScript.

Features of JavaScript

JavaScript is one of the most widely used programming languages, known for its flexibility and versatility in web development. Here are some key features or characteristics:

Applications of JavaScript

JavaScript is a versatile language that powers various applications, from web development to mobile apps, making it an essential tool for modern programming.

JavaScript vs. Other Programming Languages

Below is a comparison of JavaScript with Python, C++, and Java:

Feature JavaScript Python C++ Java
Type Interpreted Interpreted Compiled Compiled and Interpreted
Paradigm Multi-paradigm (event-driven, functional, object-oriented) Multi-paradigm (object-oriented, procedural, functional) Multi-paradigm (procedural, object-oriented, generic) Object-oriented, structured
Memory Management Automatic (Garbage collection) Automatic (Garbage collection) Manual Automatic (Garbage collection)
Syntax Simple Simple Complex Complex
Use Cases Web development, mobile apps, real-time applications Web development, data analysis, machine learning System programming, game development, high-performance applications Large-scale applications, enterprise software
Notable Frameworks/Libraries React, Angular, Node.js Django, Flask Standard Library, Boost Spring, Hibernate
Community Support Strong Strong Strong Strong
Job Market Abundant Abundant Abundant Abundant

List of Companies Using JavaScript

These are some popular companies that use JavaScript in their workflow

Company Description
Google Google uses JavaScript extensively in its web services, including Gmail and Google Maps.
Facebook Facebook’s front-end is built with React, a JavaScript library, for a dynamic user interface.
Netflix Netflix uses JavaScript for their interactive user interface and in their backend services.
Airbnb Airbnb relies on JavaScript, using Node.js for scalable back-end development and React for the front end.
LinkedIn LinkedIn uses JavaScript for both front-end and back-end development, enabling real-time interaction.
Uber JavaScript is used by Uber for real-time tracking and routing, employing both front-end and back-end technologies.
Twitter Twitter uses JavaScript for handling its dynamic feeds and providing a seamless user experience.
PayPal PayPal’s front-end is powered by JavaScript, offering smooth, interactive user experiences.
eBay eBay uses JavaScript to build their responsive, dynamic web applications and enhance user interactions.
Slack Slack's web client and several of its real-time communication features are powered by JavaScript.

Career & Jobs in JavaScript

JavaScript opens up a variety of career opportunities, as it is essential for web development, app creation, and dynamic user interfaces. Here are some top career paths for JavaScript developers

Career Average Salary (INR) Per Annum Average Salary (USD) Per Annum
JavaScript Developer ₹500,000 – ₹1,200,000 60,000–60,000 – 60,000–110,000
Front-End Developer ₹600,000 – ₹1,400,000 65,000–65,000 – 65,000–120,000
Full Stack Developer ₹700,000 – ₹1,500,000 75,000–75,000 – 75,000–130,000
Back-End Developer ₹600,000 – ₹1,300,000 70,000–70,000 – 70,000–125,000
Web Developer ₹500,000 – ₹1,200,000 55,000–55,000 – 55,000–100,000
React Developer ₹600,000 – ₹1,300,000 70,000–70,000 – 70,000–125,000
Node.js Developer ₹700,000 – ₹1,600,000 75,000–75,000 – 75,000–135,000
UX/UI Designer ₹600,000 – ₹1,300,000 65,000–65,000 – 65,000–120,000
Software Engineer ₹500,000 – ₹1,500,000 65,000–65,000 – 65,000–120,000

If you are a person, who is more into study from Courses. JavaScript Course Provides you Complete Beginner to Advanced learning.

Get detailed list of all JavaScript Topics- JavaScript Complete Guide – A to Z