An Explanatory Guide to Introduction and Working of React JS

Introduction to React JS

Let’s understand React JS with an interesting example:

Suppose one of your friends posted a picture on Facebook. Now you go and like the photograph and also began checking out the comments as well. While you are browsing over the fun comments, you suddenly notice that the count has shot up to 100, since you liked the image, even in the absence of reloading the page. Know that this miraculous count change is because of React JS. The fact that there are a number of React JS development companies today marks its popularity. 

React is a flexible, declarative, and efficient JavaScript library for developing user interfaces. React JS is a component-based front-end, the open-source library which is responsible for the view layer of the application. React JS is maintained by Facebook.  

React employs a declarative paradigm which makes reasoning about your application easier and aspires to be both efficient as well as flexible. It creates simple views for every state in your application, and React will update effectively and exhibit just the right component when data changes. Such a declarative view renders your code more predictable as well as easier to debug. 

A react application has multiple components, each of which is responsible for making a small and reusable piece of HTML. Components can also be inserted into other components so as to allow complex applications to be made out of simple building blocks. A component can also render an internal state - for instance, a TabList component can store a variable that corresponds to the presently open tab.

How Does React JS Works 

While developing client-side applications, a team at Facebook developers recognized that the DOM (The Document Object Model) which is an application programming interface (API) for XML and HTML documents is rather slow. DOM illustrates the logical structure of documents and also the way a document is being accessed as well as manipulated. Thus, in order to make it faster, React executes a virtual DOM that is essentially a DOM tree representation in JavaScript. Hence, when it requires to read or write to the DOM, it utilizes its virtual representation. The virtual DOM then tries to find the most effective way to update the browser's DOM of the browser.

In contrast to elements of browser DOM, React elements are simple objects that are cheap to build. React DOM is responsible for updating the DOM so as to match the React elements. This is due to the fact that JavaScript is quite fast and keeping a DOM tree in it is worth it to speed up its manipulation.  

Though React was designed to be used in the browser, it can also be used in the server with Node.js because of its design.  

Conclusion 

Getting successful in application development means making use of just the right tools in order to make your code as efficient and effective as possible. And when it comes to creating user interfaces, React JS is one tool you really need to know how to take advantage of. 

Hope this article helps you get a good understanding of React. Keep reading and feel free to ask queries by reaching out to us. We will shortly get back to you and solve all your questions.