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JavaScript

JavaScript - A Basic Guide

JavaScript (JS) is the world’s most popular lightweight, interpreted compiled programming language. It is also known as a scripting language for web pages. It can be used for Client-side as well as Server-side developments. 

JavaScript can be added to your HTML file in two ways:

  • Internal JavaScript: We can add JS code directly to our HTML file by writing the code inside the <script> tag. The <script> tag can either be placed inside the <head> or the <body> tag according to the requirement.
  • External JavaScript File: We can create a file with a .js extension and paste the JS code inside it. After creating the file, add this file in <script src=”file_name.js”> tag inside <head> tag of the HTML file.

Syntax: It is the basic syntax to write JavaScript(JS)

<script>
    // JS Code
</script>

Example 1: It is the basic example to embed JS code in an HTML file.  

<!DOCTYPE html>
<html lang="en">
 
<head>
    <title>
        Basic Example to Embed JavaScript
    </title>
</head>
 
<body>
 
    <!-- JavaScript code can be embedded inside
        head section or body section -->
    <script>
        console.log("Welcome to CodrGeeks");
    </script>
</body>
 
</html>

What is JavaScript?

JavaScript is a programming language that is commonly used to add interactivity and dynamic behavior to websites. It is a client-side language, which means that it is executed by the user's web browser rather than on a server. This allows for faster and more responsive web pages, as the browser can process and execute JavaScript code without having to communicate with a server.

JavaScript is often used in conjunction with HTML and CSS to create web pages that are visually appealing and easy to use. It can be used to manipulate the content and layout of a web page, validate form input, and create animations and other interactive effects.

JavaScript is an object-oriented language, which means that it is organized around the concept of objects. An object is a collection of related data and functions that represent a real-world entity or concept. For example, a "car" object might have data such as its make and model, as well as functions such as "start" and "stop."

JavaScript is a relatively easy language to learn, and it is widely used by developers around the world. It is a popular choice for building web applications, and it is also used to create native mobile apps and desktop applications using frameworks such as Electron.

Why JavaScript is used?

JavaScript is a popular choice for building web applications because it is easy to learn and use, and it is supported by all modern web browsers. It is also a client-side language, which means that it can be executed directly in the user's web browser, allowing for faster and more responsive web pages.

Some of the main reasons why JavaScript is used include:

  1. Adding interactivity to web pages: JavaScript can be used to create interactive elements on a web page, such as drop-down menus, pop-up windows, and form validation.

  2. Creating animations: JavaScript can be used to create animations and other visual effects on a web page, such as image sliders and carousels.

  3. Manipulating the content and layout of a web page: JavaScript can be used to change the content and layout of a web page in real-time, allowing for a more dynamic user experience.

  4. Validating form input: JavaScript can be used to validate form input on the client-side, saving the server from having to do the same validation.

  5. Creating native mobile apps and desktop applications: JavaScript can be used to create native mobile apps and desktop applications using frameworks such as Electron.

Overall, JavaScript is a powerful and widely-used language that is essential for building modern web applications.

How JavaScript is different from HTML?

Here are some key differences between HTML and JavaScript:

  1. HTML is a markup language used to structure and layout content on the web, while JavaScript is a programming language used to add interactivity and dynamic effects to web pages.

  2. HTML uses tags and elements to define the structure and layout of a web page, while JavaScript uses statements and expressions to execute code and perform actions.

  3. HTML is used to define the content and structure of a web page, while JavaScript is used to manipulate the content of a web page after it has been loaded into the browser.

  4. HTML is a static language, which means that content defined in HTML cannot be changed or modified by the user. JavaScript, on the other hand, is a dynamic language, which means that it can change and modify the content of a web page in response to user input or other events.

  5. HTML is written in plain text and does not require any special software or tools to create or edit. JavaScript, on the other hand, requires a text editor or an integrated development environment (IDE) to write and debug code.

  6. HTML uses tags and elements to define the structure and layout of a web page, while JavaScript uses functions and objects to perform tasks and store data.

  7. HTML is used to describe the content and structure of a web page, while JavaScript is used to add interactivity and dynamic effects to the page.

Why to learn JavaScript ?

There are several reasons why learning JavaScript can be beneficial:

  1. JavaScript is one of the most popular programming languages in the world, and it is used to build a wide variety of applications, including web, mobile, desktop, and server-side applications.

  2. JavaScript is a versatile language that can be used to build a wide variety of applications, including web applications, mobile apps, games, and more.

  3. JavaScript is a client-side language, which means that it is executed in the user's web browser, rather than on the server. This makes it an efficient and fast language for building web applications.

  4. Learning JavaScript can open up a lot of job opportunities, as there is a high demand for JavaScript developers in the job market.

  5. JavaScript is a powerful and flexible language that can be used to build a wide variety of applications, and learning it can help you become a more well-rounded and versatile developer.

  6. JavaScript is a language that is constantly evolving and improving, and learning it will help you keep up with the latest trends and technologies in the field.

Overall, learning JavaScript can be a rewarding and valuable experience, and it can open up a lot of doors in terms of career opportunities and the types of projects you can work on.

Learn more about JavaScript

  • Introduction to JavaScript
  • Where to put JavaScript code in an HTML Document?
  • Introduction to JavaScript Course
  • Introduction to Object-Oriented Programming in JavaScript
  • Top 5 JavaScript Projects For Beginners
  • How to Become a JavaScript Developer?
  • 7 JavaScript Concepts That Every Web Developer Should Know
  • JavaScript Backend basics
  • Advanced JavaScript Backend Basics
  • Functional Programming in JavaScript
  • Top 5 Reasons to Learn JavaScript
#JavaScript

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