What is JavaScript?

JavaScript (JS) is a high-level, dynamic, untyped, and interpreted programming language. It is one of the core technologies of the World Wide Web, alongside HTML and CSS. JavaScript enables interactive web pages and is an essential part of web applications.

Why Use JavaScript?

JavaScript is widely used for creating dynamic and interactive web content. It allows developers to implement complex features on web pages, such as:

• Interactive forms
• Animations
• Real-time updates
• Games
• Web applications

How to Use JavaScript in the Browser

To use JavaScript in a web browser, you can include it directly in your HTML file using the <script> tag. Here’s a simple example:

<script>
    console.log("Hello, this is from the file");
    console.log(5 + 5);
</script>

In this example, the console.log() function is used to print messages to the web console.

Explanation of the Code

The following lines of code demonstrate how to use console.log():

console.log("Hello kese ho this is from file");
console.log(5 + 5);

• console.log("Hello kese ho this is from file"); - This line outputs the string "Hello kese ho this is from file" to the console. It is a way to display messages for debugging or informational purposes.
• console.log(5 + 5); - This line performs a simple arithmetic operation (addition) and outputs the result (10) to the console. It demonstrates how JavaScript can handle calculations.

How to Install Node.js

Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. It allows you to run JavaScript on the server side. To install Node.js:

1. Visit the Node.js official website.
2. Download the installer for your operating system.
3. Run the installer and follow the instructions.
4. Verify the installation by opening a terminal or command prompt and typing node -v to check the version.

Conclusion

JavaScript is a powerful and versatile language that is essential for modern web development. Whether you are building interactive web pages or server-side applications with Node.js, understanding JavaScript is crucial for any web developer.