What is React JS: A Brief Introduction

In 2013, the first version of React JS was unleashed on the world. And it has taken it by storm ever since. React is a popular open-source JavaScript library used to create robust and dynamic user interfaces for web applications. Created by Facebook, React excels in these three areas:

• Being declarative and making it ‘painless’ to develop interactive User Interfaces (UIs)
• Being Component-Based: React Builds encapsulate components that manage their own states and compose them to make intricate UIs; delivering top rendering performance.
• Being unobtrusive so you can write new features in React without reformulating existing code.

React has been around for almost a decade now, becoming a big hitter in front-end development and now shows no signs of slowing down. Along with its popular sister platform React Native, used for building mobile applications, React is certainly the front-end king of the castle in 2021. In this article, we’re going to break down the nine reasons why React is so popular.

1. React is Easy to Grasp

If rule No.1 in software development is simplicity and avoiding complexity at all costs, then React JS takes the biscuit.

One of the top benefits of React is how easy it is to grasp, particularly if you already are a pro at JavaScript. You can install React and be up and running in a few hours, getting straight to work building web applications. The documentation is clear and there is a lot of it. Furthermore, the short learning curve means you can waste less time learning and more time doing. It is almost certainly why React has had such widespread adoption.

Furthermore, it makes onboarding internal teams, clients and new projects much easier for web development teams by getting everyone on the same page quickly and easily.

2. React Builds Robust & Intuitive User Interfaces

React is Declarative

React JS makes front-end development a piece of cake for developers. It allows developers to declaratively describe user interfaces, taking a lot of the heavy lifting out of the coding process while making the code more simple to read and understand. React makes interactive UIs by changing the state of the component and updating the DOM virtually. Cutting out the actual DOM makes creating UIs a more intuitive and less complex process (more on this later).

Robust & Dynamic

You can rely on the React library to get the job done. It is dynamic in its ability to create an interface that doesn’t compromise the speed or robustness of the application. You can be confident in what you create and not have to spend lots of time optimising the code or debugging issues with the underlying library. However, because of the declarative nature of React, any debugging is much simpler to carry out.

3. Offers a Well-Supported Library

Building robust and intuitive libraries is made possible by the extensive and well-supported React component library and NPM packages. There are so many pre-build component libraries to choose from, meaning you can pull in a lot of what you need to start building better UIs. The component libraries can speed up development times for those that don’t have time to create their components from scratch.

On top of that, React JS has (at the time of writing) 218009 packages available on NPM, a subsidiary of GitHub. The (growing) amount of resources available to front-end developers with React means you’ll never be at a loose end.

4. React Increase Productivity

As we’ve already seen in this article, React does a lot to simplify and speed up processes. React is great at streamlining workflows, but there is one feature that most developers rejoice at, and that is reusable components.

Reusable Components

A stand-out benefit of React is its ability to reuse code throughout an application. It’s the React ‘get out of jail free card’ as you escape being a prisoner to hours of tedious and repetitive coding tasks.

React helps you work smarter, not harder, by allowing you to re-use components you’ve already written across the same application and on totally different builds with similar functionality. Reusable components also help to maintain a consistent code style and the overall maintainability of the application.

5. Virtual DOM for Faster Rendering

There React goes again, speeding up development times and increasing productivity!

React is fast. One of the hallmarks of a good web application is a superior page experience; a massive contributor to page speed is load time. React renders the DOM (Document Object Model) virtually first as a copy of the actual DOM. React will only make the changes necessary changes to the UIs through the virtual DOM. Consequently, an application doesn’t have to re-render the entire User Interface and speeds up loading times.

As well as improving the overall page experience and load times for users, this has a massive impact on SEO (Search Engine Optimisation). By keeping rendering times down, search engine crawlers will favour webpages built in React because of their speed and agility.

6. React Makes Testing Easy

React is much easier to test than alternative libraries. Even before sending code to a QA team, developers have lots of testing capabilities right at their fingertips. React allows you to run automated unit tests and integration tests which help you to test individual snippets of code to ensure everything is working as you expect.

Jest

Jest is the inbuilt testing feature that is shipped with React JS and created by Facebook. It is simple to install for brand-new applications and pre-existing apps, it’s not too much more effort. You can see a tutorial for installing Jest here.

In terms of larger projects, Jest can help test large quantities of code that work together and help spot anomalies and regressions in the code with confidence. Ensuring your project is consistently moving forwards by highlighting any potential issues early on so you aren’t backpedalling to fix problems later down the road.

8. Strong Community Support

React JS is brought to life by its community. Since becoming open-source in 2015, a large contributor to React’s success comes from how its community of developers interacts with the library. As well as having large community repositories on GitHub and a buzzing forum on Stack Overflow, developers love working with React. It’s easy to see why.

One of the best parts of having such an active community is that everyone is solving problems together. The chances are that if you have a problem, another developer resolved it already. Often, all it takes is a quick copy and paste to make your problems have fizzled away. The community that surrounds React is a massive proponent of React’s overall efficiency.