React JS - 7 Begineer Facts You Should Teach Right Away
Tags: facts
Published: 2020-03-27 12:49:12

React JS is once again gaining the attention of developers around the world. According to [StackOverflow's developer survey of 2019](https://insights.stackoverflow.com/survey/2019#technology), React.js ranks second in most popular and loved web frameworks across developers around the world. And as it uses JavaScript for programming the resources, developers can easily get their hands on this tech without having to hassle much.

To create a bright future in the IT industry, it becomes essential to keep yourself updated on all the new technical aspects and learn them to meet the demands of the industry. If you have garnered the best approaches, it becomes easier to land an excellent job in the industry. And React JS is one of the hottest technology trends today.

## React JS: How It Composes a Great User Experience
React JS is an open-source framework that is extensively used to craft user interfaces, especially for single-page applications. It uses JavaScript to program and deploy user interfaces. Developed by [Jordan Walke of Facebook](https://medium.com/@ji/react-was-invented-by-jordan-walke-who-was-working-on-facebook-ads-at-the-time-db5fdd21f5a4), React JS was first used on Facebook and later on Instagram.

To establish yourself as one of the React experts, there are some basic functionalities of it that you should definitely know about. Here are some essential functions that not only the experts but the beginners should also focus on learning. These are not only basic interview questions, but they are the necessary information about React that every JavaScript developer must know.

## Noteworthy Functionalities of React JS that Makes It One of the Best Web Frameworks to Work With
Here are the points that make React JS one of the best web frameworks to choose for development. Also, they justify why most of the popular organizations are inclined towards using React JS in their web applications.

### 1. Virtual DOM
A document object model [(DOM)](https://en.wikipedia.org/wiki/Document_Object_Model) is created when a web page is loaded in a browser. A DOM is a tree of objects that helps a web page load in browsers when a user opens it. And React introduces a virtual DOM facility, which is an in-memory representation of DOM. 

When the display elements are called, and the rendering process is about to start, virtual DOM gets activated. The UI (User Interface) representation is kept in the memory and loaded with the virtual DOM. This helps provide a faster loading experience, along with all the right UI elements. This helps create a better experience and deliver excellent services as well.

### 2. Babel
[Babel](https://babeljs.io/) is a compiler of JavaScript that is used in the React engine, and it is a toolkit that helps in converting [ECMAScript 2015+](http://www.ecma-international.org/ecma-262/6.0/) to a JavaScript compatible version. Babel can actually prove to be useful when it comes to generating an excellent user experience as it can perform many different functions at once:

- Syntax Transformation
- Transforming Source Code
- Fill out missing polyfill features in the target environment
- Strip out type annotations

A developer needs to install the babel packages to run it along with the React code. It helps generate faster and better experience and contributes to making an advanced JavaScript version and usability.

### 3. Stateless Components
JavaScript is popular for the support that it can deliver for the stateless components. The components that are independent of their states, i.e., their behavior favors the stateless mode, can be named as stateless components. To create a stateless component, a developer has to use a function or a class to deliver excellent services.

The benefits offered by stateless components are:
1. They are easy to test. Stateless components support your need for executing rigorous testing on the built components. It helps provide excellent output.

2. They are excellent performance deliverers. Stateless components might not need any memory allocations soon and save the excess time and space usage to provide a faster programming experience.

3. As functional stateless components can be made smaller with the "pure" component declaration using the React.memo, constructing any web app like UberEats clone using it. It makes it easier to complete the work, and they contribute to making smaller bundles.

### 4. Lifecycle Methods
In React, each component owns several lifecycle methods that you can override during the runtime to provide a better experience. There are several lifecycle methods that are more important than the rest and are often used with many components:

**Mounting**
When a component is created and is required to be added into the DOM, this particular lifecycle method is used. The instance of a component is inserted into the DOM. Mounting is used in rare cases, and hence, many developers avoid using it to avoid creating any confusion. The method used for mounting is componentDidMount().

**Unmounting**
As Mounting is used to insert a component in the DOM, the unmounting is used to remove a component from the DOM. The method used for mounting is componentWillUnmount().

**Error Handling**
When any error is anticipated in the rendering or in any child constructor component, this particular method is used to cope up with the processes at that time. The technique used for error handling is componentDidCatch().

**Updating**
If any update is caused by the change in any state or prop. When any element is re-rendered, this particular method is used. The method used for enabling the updating is componentDidUpdate().

### 5. The Difference between Props and States
Props and state both are the characteristics of components. However, they are JavaScript objects only that hold the information for components. But the significant difference between these two is: while props are used to transfer information among components, the state is what a particular component holds at a particular time.
React js is undoubtedly one of the best support you can find to build your website and web apps. Using the best support that this technology extends, you can achieve success in less time and with the best approaches. Hence, it is necessary to consider having the best tech experts on hand when you are developing with React js. You can carry the features and expand the web app usage.
## Summing Up
React holds the utmost importance for all the developers who want to enter the field of web development. As it allows crafting excellent user experience and uses JavaScript, which comforts developers to complete their tasks well, React JS is set to become one of the trending techs of the web development industry.

By delivering excellent support for crafting user experience for single-page apps, React is getting implemented in many modern app solutions that are constructed as web apps. However, the continuous change in the web development industry promises to provide a better future by adding up many features that help build a better web application.

## References:
https://reactjs.org/docs/react-component.html
https://www.elluminatiinc.com/ubereats-clone/
https://reactjs.org/docs/components-and-props.html
https://reactjs.org/docs/state-and-lifecycle.html