What is ReactJS and how does it work?

Time Of Info By TOI Staff   November 18, 2022   Update on : November 18, 2022


We are currently finding various technologies for developing web applications. One of them is React JavaScript. If you want to know its key aspects, keep reading this article. Here we will look at what React JS is, how it works, and other important information.

What is ReactJS?

React is an open-source library written in JavaScript. It was developed by Facebook in 2013 to make it easier to create reusable and interactive components for user interfaces. One of its highlights is that it is not only used on the client side but can also be rendered on the server and work together.

Interesting data is that Facebook uses React to produce components, and Instagram is completely written in React. In addition, it is also used on other platforms such as Netflix, PayPal, Airbnb, Uber, Reddit, and Twitter. If you want to implement your project with this library, then you need to hire reactjs developer.

React is a great alternative for building all sorts of mobile or web applications, as well as building Single Page Applications (SPAs).

It also stands out for having a complete ecosystem of components, tools, and modules that allow you to develop complex features in a short amount of time.

React JS

How does ReactJS work?

To understand how React works, it is important to fully immerse yourself in the development process, where we gain knowledge of three main concepts:

  • HTML: semantics, structure, and information of a web page. This is his skeleton;
  • CSS: the appearance of our web page;
  • JavaScript: This is the brain of our page. Determine what to do based on what happens in it.

However, before React, these concepts worked separately, in different files and folders, so scaling and extracting different parts of the code to reuse or port functionality was more difficult.

Because of this, Facebook engineers decided to include everything in a single package, which they called a “component”. In components, HTML and JS structures are inseparable and can be combined with CSS. This enabled the implementation of a new product that makes the development of scalable applications more efficient: JSX, which stands for JavaScript XML.

What is JSX?

It consists of a JavaScript syntax extension that allows us to compile a JavaScript object to map to a DOM element (document object). JSX creates a virtual DOM (which is an in-memory representation of the DOM) that is very lightweight and uses fewer resources.

That being said, when React receives state change information, it re-executes those functions and defines a new virtual representation of the specified page. It then automatically converts that result into the required DOM changes, thereby reflecting the new page view.

At first glance, this seems to be slower than the usual JavaScript approach of updating each element as needed. However, behind the scenes, React JS has a very efficient algorithm for detecting inconsistencies between the virtual representation of the current page and the new page. From these differences, create the minimum set of required changes to the DOM.

This uses the concept of virtual DOM, which selects node subtrees based on state changes. This way you keep your components up to date with minimal DOM manipulation.

Now, choosing which technology to use in the FrontEnd of a new project, we are faced with an important decision that will greatly affect the future of our application. For this reason, it is very important to choose technologies that complement and facilitate development. And one of those tools is React JS.

But why do you need to know React JS? Mainly because of the novelties it provides such as:

One-Way Data Binding: Facilitates the flow of data in one direction, making it easier to find bugs in complex applications, simplifying data loading, and facilitating the testing phase.

Virtual DOM: This avoids rendering the entire DOM every time the application interface changes.If you are not very strong in React development, then you can always turn to https://devoxsoftware.com/custom-software-development-in-kansas-city/ for help with the project.


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