What Is JavaScript?

JavaScript (JS) is a computer programming language used to make websites and applications dynamic and interactive.

Think of these coding languages as the components of a house:

HTML is the foundation of the house. It provides the basic layout, structure, and content of a website.

CSS is the interior design. It provides design, fonts, colors, effects, and other visual elements. 

JavaScript is the electrical and plumbing systems. JS brings dynamism and interactivity to the website. For example, pop-ups, animations, video and social media embeds, drop-down menus, and many other website components are created using JavaScript.

Brendan Eich developed JavaScript in 1995 while working for Netscape.

Libraries vs. Frameworks

Libraries are collections of prewritten code that can be used to easily implement frequently used JavaScript tasks.

Libraries lead to faster development because developers don’t need to write every line of code.

Frameworks are collections of libraries.

Think of libraries as tools. And frameworks as fully loaded toolboxes.

What Is JavaScript Used For?

JavaScript is used to make dynamic websites, web and mobile apps, games, web servers, back-end infrastructures, and more.

Developers use JS to add animations, pop-up windows, search bars, buttons, audio and video, chat widgets, and other interactive elements to a webpage.

Server-Side Programming

Server-side programming refers to code that runs on a web server to handle requests from clients (such as web browsers) and return responses.

Mobile App Development

JavaScript frameworks, such as React Native, Ionic, NativeScript, and Apache Cordova, enable developers to build native and hybrid mobile apps for Android and iOS.

Artificial Intelligence

In recent years, developers have used JavaScript to build applications and systems that leverage artificial intelligence.

You can use JS libraries such as TensorFlow.js and Brain.js to build and train machine learning models for sentiment analysis and recommendation systems. 

How Is JavaScript Different from Other Programming Languages?

1-It’s an Interpreted Language

This means it can be executed directly in a browser.

2-It Uses Dynamic Typing

Dynamic typing means variable types are associated with runtime values, not named or declared fields. 

3-It’s Primarily Used in Client-Side Execution

JavaScript is unique in that it’s most commonly run in the user’s web browser. Not on a server.

4-It’s Ubiquitous

Unlike many computer programming languages that are confined to a handful of specific use cases, JavaScript is becoming a general-purpose language.

It’s supported by all major browsers.

It can be used both client-side and server-side.

And it can be used to develop websites, mobile apps, and software. 

How to Use JavaScript on Your Website

If you’re one of the few websites on the internet not using JavaScript, you can add it two ways:

1-Embedding-You can add JavaScript code to your website by placing it directly into the <head> of your webpage’s HTML source code.

2-Linking

You can also add JavaScript to your website by linking to an existing JS file.

This is useful when you want to add the same code to multiple pages.

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