What is ReactJS? And Why ReactJS?

React.js is an open-source JavaScript library that is used for building user interfaces specifically for single-page applications. React allows developers to create large web applications that can change data, without reloading the page. The main purpose of React is to be fast, scalable, and simple.

Why React JS?

If you are new to React.js, you must be wondering why it is so popular and why you should use it in your applications. If so, then you are in the right place.

1.React is Flexible

"The main advantage of using a Library over a Framework is that Libraries are lightweight, and there is a freedom to choose different tools. The Framework consists of an entire ecosystem to build an application, and you don't have an easy way to use any other tools outside the Framework."

2.React Has a Great Developer Experience

Mainly all the people coming from different languages will get fall in love with React. Because of its great development experience. React's API is very simple to learn. It has very few concepts to learn. Here is a small example of a React Component:

In my point of view the major advantage of React is that "React uses the opposite approach. It uses HTML (JSX) inside JavaScript. I like this approach because here, you can deal with pure JavaScript and HTML".

3.Libraries and Framework in React JS

In some cases you even don't have to write all the stuff because of the libraries and frameworks present in React JS. Many of them are very easy to handle and gives you a perfect user friendly Interface.
Some of the React JS libraries and Frameworks are listed below:-

• Ant Design
• Semantic UI
• Material UI
• Tailwind UI
• Styled components
• Redux

4.React has Great performance

The React team realized that JavaScript is fast, but updating the DOM makes it slow. React minimizes DOM changes. And it has figured out the most efficient and intelligent way to update DOM.
Before React, most frameworks and libraries would update the DOM unintelligently to reflect a new state. This resulted in changes to a significant portion of the page.
React monitors the values of each component's state with the Virtual DOM. When a component's state changes, React compares the existing DOM state with what the new DOM should look like. After that, it finds the least expensive way to update the DOM.

5.React is Easy to Test

After Creating a React by just using:-

 

• Many traditional UI browser testing is hassle to set up. on the other hand we require very less commands or no configuration for testing ReactJS.

• We also don't have to work much on environment to run ReactJS on any IDE.

• Traditional UI browser requires browsers for testing, but you can test React components quickly and easily using the node command-line.

6.Many Companies using React JS

9611 companies reportedly use React in their tech stacks, including Uber, Airbnb, and Facebook.

• Uber.
• Airbnb.
• Facebook.
• Netflix.
• Pinterest.
• Instagram.
• Shopify.
• Amazon. 

Conclusion

React is an excellent tool with which to create interactive applications for mobile, web, and other platforms.

Many companies are using React and also hiring React developer for React and as we can see after going through this block that we can easily work on Frontend and make a better UI by just using React Library which is now getting popular day-by-day.

And Not only this but also React is a open source JavaScript Library which is maintained by Facebook so You can also Contribute in React.

Source: freecodecamp
React-Contribution: facebook/react/contribute
Follow: MERN_JS-Instagram