JavaScript: what is it and what is it for?

28 November 2024
6 minutos
Blog

JavaScript is one of the most popular and widely used programming languages in the world of web development. Introduced in 1995, this language is key to the creation of dynamic and interactive web pages, making it an indispensable element in today's digital environment.

In general terms, we can define JavaScript as a text-based programming language that is used both on the client side (frontend) and on the server side (backend). Its flexibility and versatility allow from the animation of graphics on a web page to the development of complete applications.

What is JavaScript used for?

JavaScript plays a central role in modern web development. Its ability to run directly in the web browser makes it an essential tool for creating rich user experiences. Here, we take a look at some of its most prominent uses:

1. Creating interactive web pages

JavaScript allows web pages to respond to user actions in real time, making the experience more fluid and dynamic. Common examples include: forms that validate data before submission, interactive drop-down menus, and image carousels that move automatically.

2. Full web application development

Frameworks and libraries such as React, Angular or Vue.js are based on JavaScript for the development of single-page applications (SPA). These applications load all their content dynamically, without the need to reload the entire page.

3. Backend development

With the introduction of environments such as Node.js, JavaScript has extended its reach to the backend. This means that developers can write both server-side and client-side code using the same language.

4. Animations and graphics

JavaScript, along with tools such as Canvas and WebGL, is an excellent choice for developing complex animations, online games or even advanced data visualisations.

5. Internet of Things (IoT)

JavaScriptis alsoused in connected devices through platforms such as Johnny-Five or Node-RED, facilitating the programming of smart devices.

5 advantages of JavaScript

JavaScript's success is no accident. Below, we explore some of its main advantages:

1. Runs directly in the browser

JavaScript is interpreted by modern web browsers, which eliminates the need to compile code before running it. This allows for quick testing and immediate results.

2. Unparalleled interactivity

JavaScript allows developers to transform static pages into interactive experiences. It is possible to respond to user events in real time, such as clicks or scrolling.

3. Cross-platform

JavaScript is platform independent, which means that any device with a browser can run it. This includes everything from computers to smartphones.

4. Extensive community and resources

JavaScript has one of the largest developer communities in the world. This translates into: extensive documentation and educational resources, multiple frameworks and libraries, and active forums to solve problems quickly.

5. Versatility

JavaScript can be used both client-side and server-side, eliminating the need to learn multiple languages to develop complete applications.

4 limitations of JavaScript

Despite its many advantages, JavaScript is not without its limitations. Here are some of the most notable ones:

1. Security issues

Because JavaScript runs directly in the browser, it can be vulnerable to attacks such as cross-site scripting (XSS). Although tools exist to mitigate these risks, it is still a major concern.

2. Cross-browser compatibility

While modern browsers are fairly consistent in their support for JavaScript, minor differences can still arise, especially with more advanced or recent features.

3. Difficulty debugging errors

JavaScript is an interpreted language, which means that bugs often appear at runtime. Although debugging tools have improved considerably, it is still more complicated to debug compared to compiled languages.

4. Messy code

JavaScript's flexibility can be a double-edged sword. If a clear structure is not followed, code can become chaotic and difficult to maintain, especially in large projects.

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Whatis Node.js and what is it used for?

At the end of the Degree you will get the most complete programmer profile in the market by combining knowledge of Back End and Front End development.

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The last course will be the final step for your insertion in the labour market, learning about IoT (Internet of Things), cybersecurity, mobile application development and legal and ethical aspects of information technologies.

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