What is React and Why should you learn it in 2020?

What is React?

In a small definition, React is a declarative, efficient, and flexible JavaScript library for building user interfaces. It is maintained by Facebook and a community of individual developers and companies.

It is currently one of the most popular JavaScript front-end libraries which has a strong foundation and a large community supporting it.

React can be used as a base in the development of single-page applications or mobile applications. Complex React applications usually require the use of additional libraries for state management, routing, and interaction with an API.

React

ReactJS is only a frontend library which deals with the View component of MVC (Model – View – Controller).

Why use ReactJs?

As we all know many Javascript frameworks like Angular, Backbone, Ember, and more were already within the industry to manage the view of our application then why React?

The answer is:

React is Component-based

The main point i would like to spotlight here about ReactJs is, it's a component-based language and everything here may be a component. If you create any UI it can work as a component for others.

For example, one could make a <MyHeaderMenu> component that might

Display a Logo, Heading, Subheading, Search bar input, Navbar menu
Run validations on the text typed into the search bar input
Submits the shape when the user hits the enter key

All just by including one line of code: <MyHeaderMenu></MyHeaderMenu>

However, React is capable of becoming a whole replacement for your views because you'll nest components. to make an outsized app you'll use small components, These components are often standard HTML components otherwise you can make your own components.

The biggest advantage of using components is that you simply can change any component at any point in time without affecting the remainder of the applications. This feature is best when implemented with larger and real-time applications where data changes frequently.

When we update or change any data, ReactJS automatically updates the precise component whose state has actually changed. this protects the browser from the task of reloading the entire application to reflect the changes.

Example of the online page entirely rendered using ReactJs is often

<HomePage>
     <Header tab-selected="home" />
     <Banner>Here will be Banner Text</Banner>
     <p>Contact me by filling below form</p>
     <ContactForm />
     <Footer />
</HomePage>

So with the help of this small example, you can imagine the scope of ReactJs in industry.

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